stainless steel
seamless pipe & tube
TeCarve is a manufacturer-backed stainless steel seamless pipe and tube supplier providing ASTM A312 pipe and related tube specifications for industrial procurement. Available grades include 304, 304L, 316, 316L, 321, 310S, 317L, 904L and Duplex 2205, with outer diameters from 6 mm to 1600 mm and wall thicknesses from 0.5 mm to 100 mm. Customized dimensions, lengths and surface finishes can be specified for each order.
For non-standard dimensions, lengths, and inspection requirements, explore our custom stainless steel tube fabrication service.
Global Sizing Range & Standards: We supply seamless pipe across NPS 1/8″ to 24″ (OD 10.3 to 610 mm) and precision tubing from 6 mm OD, covering wall schedules Sch 5S through XXS. All production strictly adheres to ASTM A312, ASTM A213, and EN 10216-5 specifications.
For project engineering support or factory audits, explore our Seamless Pipe Technical Guide or Verify Our Partner Factories.
ASTM A312 Seamless Pipe: NDT per standard or order, Batch PMI & Heat-Traceable 3.1 MTC
High-pressure integrity without sourcing ambiguity. Cold-drawn and cold-rolled seamless pipes in grades 304, 304L, 316, and 316L from our Wenzhou partner factory.
Specifications
Available Sizes & Dimensional Tolerances by Standard
Scope & Engineering Application: N. America, Latin America, Middle East EPC, Oil & Gas — Seamless Austenitic Stainless Steel Pipe (ASME B36.19M / B36.10M, ASTM A999 General Requirements)
| NPS | Schedule | OD (mm / in) | WT (mm / in) | ASTM A999 OD Tol. | ASTM A312 Table 3 WT Tol. | Theor. Weight (kg/m) |
|---|---|---|---|---|---|---|
| 1/8" | 10S | 10.3 mm (0.405") | 1.24 mm (0.049") | +0.40 / -0.79 mm (+1/64", -1/32") | -12.5% / +20.0% | 0.28 kg/m |
| 1/4" | 40S | 13.7 mm (0.540") | 2.24 mm (0.088") | +0.40 / -0.79 mm (+1/64", -1/32") | -12.5% / +20.0% | 0.64 kg/m |
| 1/2" | 10S | 21.3 mm (0.840") | 2.11 mm (0.083") | +0.40 / -0.79 mm (+1/64", -1/32") | -12.5% / +20.0% | 1.01 kg/m |
| 1/2" | 40S | 21.3 mm (0.840") | 2.77 mm (0.109") | +0.40 / -0.79 mm (+1/64", -1/32") | -12.5% / +20.0% | 1.27 kg/m |
| 1/2" | 80S | 21.3 mm (0.840") | 3.73 mm (0.147") | +0.40 / -0.79 mm (+1/64", -1/32") | -12.5% / +20.0% | 1.62 kg/m |
| 3/4" | 10S | 26.7 mm (1.050") | 2.11 mm (0.083") | +0.40 / -0.79 mm (+1/64", -1/32") | -12.5% / +20.0% | 1.29 kg/m |
| 3/4" | 40S | 26.7 mm (1.050") | 2.87 mm (0.113") | +0.40 / -0.79 mm (+1/64", -1/32") | -12.5% / +20.0% | 1.69 kg/m |
| 1" | 10S | 33.4 mm (1.315") | 2.77 mm (0.109") | +0.40 / -0.79 mm (+1/64", -1/32") | -12.5% / +20.0% | 2.09 kg/m |
| 1" | 40S | 33.4 mm (1.315") | 3.38 mm (0.133") | +0.40 / -0.79 mm (+1/64", -1/32") | -12.5% / +20.0% | 2.50 kg/m |
| 1" | 80S | 33.4 mm (1.315") | 4.55 mm (0.179") | +0.40 / -0.79 mm (+1/64", -1/32") | -12.5% / +20.0% | 3.24 kg/m |
| 1-1/2" | 40S | 48.3 mm (1.900") | 3.68 mm (0.145") | +0.40 / -0.79 mm (+1/64", -1/32") | -12.5% / +20.0% | 4.05 kg/m |
| 2" | 10S | 60.3 mm (2.375") | 2.77 mm (0.109") | ±0.79 mm (±1/32") | -12.5% / +20.0% | 3.99 kg/m |
| 2" | 40S | 60.3 mm (2.375") | 3.91 mm (0.154") | ±0.79 mm (±1/32") | -12.5% / +20.0% | 5.44 kg/m |
| 2" | 80S | 60.3 mm (2.375") | 5.54 mm (0.218") | ±0.79 mm (±1/32") | -12.5% / +20.0% | 7.48 kg/m |
| 3" | 40S | 88.9 mm (3.500") | 5.49 mm (0.216") | ±0.79 mm (±1/32") | -12.5% / +15.0% | 11.29 kg/m |
| 4" | 10S | 114.3 mm (4.500") | 3.05 mm (0.120") | ±0.79 mm (±1/32") | -12.5% / +22.5% | 8.49 kg/m |
| 4" | 40S | 114.3 mm (4.500") | 6.02 mm (0.237") | ±0.79 mm (±1/32") | -12.5% / +15.0% | 16.07 kg/m |
| 6" | 40S | 168.3 mm (6.625") | 7.11 mm (0.280") | +1.59 / -0.79 mm (+1/16", -1/32") | -12.5% / +22.5% | 28.26 kg/m |
| 8" | 40S | 219.1 mm (8.625") | 8.18 mm (0.322") | +1.59 / -0.79 mm (+1/16", -1/32") | -12.5% / +22.5% | 42.55 kg/m |
| 10" | 40S | 273.0 mm (10.750") | 9.27 mm (0.365") | +2.38 / -0.79 mm (+3/32", -1/32") | -12.5% / +22.5% | 60.31 kg/m |
| 12" | 40S | 323.9 mm (12.750") | 10.31 mm (0.406") | +2.38 / -0.79 mm (+3/32", -1/32") | -12.5% / +22.5% | 79.73 kg/m |
| 16" | 40S | 406.4 mm (16.000") | 12.70 mm (0.500") | +2.38 / -0.79 mm (+3/32", -1/32") | -12.5% / +22.5% | 123.3 kg/m |
| 24" | 40S | 610.0 mm (24.000") | 17.48 mm (0.688") | +3.18 / -0.79 mm (+1/8", -1/32") | -12.5% / +22.5% | 255.4 kg/m |
- OD Limits: Asymmetric per Table 3 (tolerance includes ovality).
- Wall Thickness: Per ASTM A312/A312M-24 Table 3 — under-tolerance −12.5%; over-tolerance +20.0% for NPS 1/8–2½, and +22.5% (t/D ≤ 5%) or +15.0% (t/D > 5%) for NPS 3 and larger.
- Straightness & End Finish: Straightness variation ≤ 3.2 mm per 3.0 m (1/8" in 10 ft). Beveled ends per ASME B16.25 (37.5° ± 2.5°) for WT ≥ 3.0 mm.
Scope & Engineering Application: Heat Exchangers, Boilers, Superheaters & Condensers — Seamless Ferritic & Austenitic Alloy-Steel Tubes (ASTM A1016 General Requirements)
| OD (mm / in) | BWG Gauge | Nominal WT (mm / in) | ASTM A1016 OD Tol. | WT Tolerance | Theor. Weight (kg/m) |
|---|---|---|---|---|---|
| 6.35 mm (1/4") | 20 | 0.89 mm (0.035") | ±0.10 mm (±0.004") | ±10.0% | 0.12 kg/m |
| 9.53 mm (3/8") | 18 | 1.24 mm (0.049") | ±0.10 mm (±0.004") | ±10.0% | 0.25 kg/m |
| 12.70 mm (1/2") | 16 | 1.65 mm (0.065") | ±0.10 mm (±0.004") | ±10.0% | 0.45 kg/m |
| 15.88 mm (5/8") | 16 | 1.65 mm (0.065") | ±0.10 mm (±0.004") | ±10.0% | 0.58 kg/m |
| 19.05 mm (3/4") | 16 | 1.65 mm (0.065") | ±0.10 mm (±0.004") | ±10.0% | 0.71 kg/m |
| 19.05 mm (3/4") | 14 | 2.11 mm (0.083") | ±0.10 mm (±0.004") | ±10.0% | 0.88 kg/m |
| 22.23 mm (7/8") | 16 | 1.65 mm (0.065") | ±0.10 mm (±0.004") | ±10.0% | 0.84 kg/m |
| 25.40 mm (1.0") | 14 | 2.11 mm (0.083") | ±0.10 mm (±0.004") | ±10.0% | 1.21 kg/m |
| 25.40 mm (1.0") | 12 | 2.77 mm (0.109") | ±0.10 mm (±0.004") | ±10.0% | 1.55 kg/m |
| 31.75 mm (1-1/4") | 14 | 2.11 mm (0.083") | ±0.13 mm (±0.005") | ±10.0% | 1.54 kg/m |
| 38.10 mm (1-1/2") | 12 | 2.77 mm (0.109") | ±0.15 mm (±0.006") | ±10.0% | 2.41 kg/m |
| 50.80 mm (2.0") | 10 | 3.40 mm (0.134") | ±0.20 mm (±0.008") | ±10.0% | 3.97 kg/m |
| 63.50 mm (2-1/2") | 10 | 3.40 mm (0.134") | ±0.25 mm (±0.010") | ±10.0% | 5.03 kg/m |
| 76.20 mm (3.0") | 9 | 3.76 mm (0.148") | ±0.30 mm (±0.012") | ±10.0% | 6.70 kg/m |
Scope & Engineering Application: Europe, Middle East, International — Seamless Steel Tubes for Pressure Purposes (EN ISO 1127 Classes D3/D4 & T3/T4)
| Nominal OD (mm) | Wall Thickness (mm) | Class D3 Standard Tol. | Precision Class D4 | WT Tol. (Class T3 / T2) | Theor. Weight (kg/m) |
|---|---|---|---|---|---|
| 17.2 | 2.0 | ±0.30 mm (±0.75%) | ±0.10 mm (±0.50%) | ±10.0% (±0.20 mm) | 0.76 kg/m |
| 21.3 | 2.3 | ±0.30 mm (±0.75%) | ±0.11 mm (±0.50%) | ±10.0% (±0.23 mm) | 1.09 kg/m |
| 26.9 | 2.3 | ±0.30 mm (±0.75%) | ±0.13 mm (±0.50%) | ±10.0% (±0.23 mm) | 1.41 kg/m |
| 33.7 | 2.6 | ±0.30 mm (±0.75%) | ±0.17 mm (±0.50%) | ±10.0% (±0.26 mm) | 2.02 kg/m |
| 48.3 | 2.6 | ±0.36 mm (±0.75%) | ±0.24 mm (±0.50%) | ±10.0% (±0.26 mm) | 2.97 kg/m |
| 60.3 | 2.9 | ±0.45 mm (±0.75%) | ±0.30 mm (±0.50%) | ±10.0% (±0.29 mm) | 4.14 kg/m |
| 76.1 | 2.9 | ±0.57 mm (±0.75%) | ±0.38 mm (±0.50%) | ±10.0% (±0.29 mm) | 5.28 kg/m |
| 88.9 | 3.2 | ±0.67 mm (±0.75%) | ±0.44 mm (±0.50%) | ±10.0% (±0.32 mm) | 6.84 kg/m |
| 114.3 | 3.6 | ±0.86 mm (±0.75%) | ±0.57 mm (±0.50%) | ±10.0% (±0.36 mm) | 9.94 kg/m |
| 168.3 | 4.5 | ±1.26 mm (±0.75%) | ±0.84 mm (±0.50%) | ±10.0% (±0.45 mm) | 18.37 kg/m |
| 219.1 | 6.3 | ±1.64 mm (±0.75%) | ±1.10 mm (±0.50%) | ±10.0% (±0.63 mm) | 33.40 kg/m |
| 323.9 | 7.1 | ±2.43 mm (±0.75%) | ±1.62 mm (±0.50%) | ±10.0% (±0.71 mm) | 56.02 kg/m |
| 508.0 | 10.0 | ±5.08 mm (±1.00%) | ±3.81 mm (±0.75%) | ±12.5% (±1.25 mm) | 124.1 kg/m |
Scope & Engineering Application: Japan, East Asia, Southeast Asia EPC Projects — Stainless Steel Pipes for Corrosion-Resistant & Pressure Service
| Nominal Size A (B) | OD (mm) | Schedule | WT (mm) | JIS G3459 OD Tol. | JIS G3459 WT Tol. | Theor. Weight (kg/m) |
|---|---|---|---|---|---|---|
| 10A (3/8B) | 17.3 | 10S | 1.65 | ±0.30 mm | ±0.20 mm (±12.1%) | 0.64 kg/m |
| 15A (1/2B) | 21.7 | 10S | 2.10 | ±0.30 mm | ±10.0% (±0.21 mm) | 1.02 kg/m |
| 20A (3/4B) | 27.2 | 10S | 2.10 | ±0.30 mm | ±10.0% (±0.21 mm) | 1.31 kg/m |
| 25A (1B) | 34.0 | 10S | 2.80 | ±0.34 mm (±1.0%) | ±10.0% (±0.28 mm) | 2.17 kg/m |
| 32A (1-1/4B) | 42.7 | 10S | 2.80 | ±0.43 mm (±1.0%) | ±10.0% (±0.28 mm) | 2.78 kg/m |
| 40A (1-1/2B) | 48.6 | 10S | 2.80 | ±0.49 mm (±1.0%) | ±10.0% (±0.28 mm) | 3.19 kg/m |
| 50A (2B) | 60.5 | 10S | 2.80 | ±0.61 mm (±1.0%) | ±10.0% (±0.28 mm) | 4.02 kg/m |
| 65A (2-1/2B) | 76.3 | 10S | 3.00 | ±0.76 mm (±1.0%) | ±10.0% (±0.30 mm) | 5.48 kg/m |
| 80A (3B) | 89.1 | 10S | 3.00 | ±0.89 mm (±1.0%) | ±10.0% (±0.30 mm) | 6.43 kg/m |
| 100A (4B) | 114.3 | 10S | 3.00 | ±1.14 mm (±1.0%) | ±10.0% (±0.30 mm) | 8.32 kg/m |
| 150A (6B) | 165.2 | 10S | 3.40 | ±1.65 mm (±1.0%) | ±10.0% (±0.34 mm) | 13.71 kg/m |
| 200A (8B) | 216.3 | 10S | 4.00 | ±2.16 mm (±1.0%) | ±10.0% (±0.40 mm) | 21.16 kg/m |
| 250A (10B) | 267.4 | 10S | 4.00 | ±2.67 mm (±1.0%) | ±10.0% (±0.40 mm) | 26.25 kg/m |
| 300A (12B) | 318.5 | 10S | 4.50 | ±3.19 mm (±1.0%) | ±10.0% (±0.45 mm) | 35.20 kg/m |
Scope & Engineering Application: China Domestic & Belt-and-Road EPC Projects — Stainless Steel Seamless Tubes for Fluid Transport
| Nominal OD (mm) | Wall Thickness (mm) | Ordinary Class PA | High-Precision Class PC | WT Tol. (PA / PC, cold-drawn) | Theor. Weight (kg/m) |
|---|---|---|---|---|---|
| 6.0 | 1.0 | ±0.20 mm | ±0.15 mm | PA ±12% / PC ±10% | 0.12 kg/m |
| 14.0 | 2.0 | ±0.30 mm | ±0.20 mm | PA ±12% / PC ±10% | 0.60 kg/m |
| 25.0 | 2.5 | ±0.30 mm | ±0.20 mm | PA ±12% / PC ±10% | 1.40 kg/m |
| 34.0 | 3.0 | ±0.40 mm | ±0.30 mm | PA ±12% / PC ±10% | 2.32 kg/m |
| 45.0 | 3.5 | ±0.40 mm | ±0.30 mm | PA +12.5% / −10% / PC ±10% | 3.62 kg/m |
| 57.0 | 3.5 | ±0.48 mm (±0.85%) | ±0.43 mm (±0.75%) | PA +12.5% / −10% / PC ±10% | 4.67 kg/m |
| 76.0 | 4.0 | ±0.65 mm (±0.85%) | ±0.57 mm (±0.75%) | PA +12.5% / −10% / PC ±10% | 7.18 kg/m |
| 89.0 | 4.5 | ±0.76 mm (±0.85%) | ±0.67 mm (±0.75%) | PA +12.5% / −10% / PC ±10% | 9.48 kg/m |
| 108.0 | 4.5 | ±0.92 mm (±0.85%) | ±0.81 mm (±0.75%) | PA +12.5% / −10% / PC ±10% | 11.60 kg/m |
| 159.0 | 5.0 | ±1.35 mm (±0.85%) | ±1.19 mm (±0.75%) | PA +12.5% / −10% / PC ±10% | 19.20 kg/m |
| 219.0 | 6.0 | ±1.86 mm (±0.85%) | ±1.64 mm (±0.75%) | PA +12.5% / −10% / PC ±10% | 31.85 kg/m |
| 273.0 | 7.0 | ±2.46 mm (±0.9%) | ±2.18 mm (±0.8%) | PA +12.5% / −10% / PC ±10% | 46.40 kg/m |
| 325.0 | 8.0 | ±2.93 mm (±0.9%) | ±2.60 mm (±0.8%) | PA +12.5% / −10% / PC ±10% | 63.20 kg/m |
| 426.0 | 10.0 | ±3.83 mm (±0.9%) | ±3.41 mm (±0.8%) | PA +12.5% / −10% / PC ±10% | 103.7 kg/m |
| 630.0 | 12.0 | ±5.67 mm (±0.9%) | ±5.04 mm (±0.8%) | PA +12.5% / −10% / PC ±10% | 184.9 kg/m |
Manufacturing Process Comparison: Cold Pilgering vs. Cold Drawing vs. Hot Extrusion
Seamless stainless steel pipe characteristics depend fundamentally on the reduction method employed from round pierced billet to finished tube. TeCarve works with partner factories operating dedicated cold pilger, cold draw, and hot processing lines matched to project engineering demands:
- Mechanism: Reciprocating grooved rolls compress the tube shell against a stationary tapered mandrel with up to 75% cross-sectional area reduction per pass.
- Wall Concentricity: Outstanding wall thickness uniformity (±7.5% to ±10%); minimizes wall eccentricity and inner ovality.
- Microstructure: Uniform compressive stress eliminates micro-cracking; lower residual hoop stress and refined grain structure.
- Primary Use: Heat exchanger U-tubes, high-pressure boiler piping, instrumentation tubes, and nuclear fuel cladding.
- Mechanism: Tube shell is pulled at room temperature through external tungsten carbide dies over an internal floating or fixed plug.
- OD Accuracy: Tight outside diameter precision (down to ±0.05 mm or ±0.4%); smooth outer diameter surface (Ra ≤ 0.4–0.8 μm).
- Flexibility: Ideal for non-standard custom OD/WT combinations, thin-wall hydraulic tubing, and small-batch tailored runs.
- Primary Use: Hydraulic signal lines, capillary and needle tubing, mechanical bushings, and bespoke instrumentation piping.
- Mechanism: Solid billet induction heated to 1150–1250°C, rotary pierced on a Mannesmann cross-roll piercer or vertical extrusion press.
- Throughput: High-efficiency forming for heavy-wall and large-diameter seamless pipes from NPS 6" (168 mm) up to NPS 24" (610 mm).
- Dimensional Limits: Standard ASTM A999 commercial limits (OD ±0.75% to ±1.0%, WT −12.5%); superior core metallurgical density.
- Primary Use: Heavy-wall steam headers, oil & gas transmission trunks, refinery flare headers, and offshore structural casings.
Surface Finish & Thermal Delivery Conditions
Full solution heat treatment (1040–1150°C) with rapid water quenching dissolves carbides, followed by nitric-hydrofluoric acid bath pickling and passivation. Restores full passivated chromium oxide layer with uniform silvery-matte finish (Ra 1.6–3.2 μm). Standard for chemical, petrochemical, and refinery piping.
Heat treated in a continuous protective atmosphere furnace under 100% dry hydrogen or cracked ammonia (dew point < −50°C). Prevents surface oxidation and eliminates acid pickling. Yields a bright, mirror-smooth inner and outer surface (Ra ≤ 0.25–0.4 μm) for clean instrumentation, gas lines, and chromatography.
Automated centerless external belt grinding and longitudinal internal polishing from 180 grit satin to 400 grit fine polish (OD Ra ≤ 0.4–0.8 μm). Eliminates minor handling blemishes and eases wipe-down decontamination for architectural, food processing, and accessible plant piping.
Anodic electrochemical dissolution in a phosphoric-sulfuric bath selectively levels microscopic peaks, boosting surface chromium-to-iron ratio (Cr/Fe > 1.5). Ultra-smooth finish (ID Ra ≤ 0.13–0.25 μm) minimizes particulate entrapment in pharmaceutical WFI and semiconductor UHP fluid transfer.
Quality Verification & Non-Destructive Testing (NDT) Standards
| Test Parameter | Applicable Standards | Inspection Scope & Acceptance Criteria |
|---|---|---|
| Hydrostatic Test (per standard/order) | ASTM A999 §13, ASTM A312, EN 10216-5 | Hydrostatic test pressure per P = 2St/D (stress S = 60% of min yield, holding time ≥ 5s, pressures up to 20 MPa / 2900 psi) without leakage or sweating. |
| Eddy Current Testing (ECT) | ASTM E426, EN 10246-2 | 100% automated electromagnetic encircling coil flaw detection for longitudinal and transverse defects, calibrated to drill hole reference standards. |
| Ultrasonic Testing (UT) | ASTM E213, EN 10246-7 | Multi-channel ultrasonic examination for internal laminations, subsurface inclusions, and radial discontinuities in severe-service and heavy-wall piping. |
| Intergranular Corrosion (IGC) | ASTM A262 Practice E / A | Copper-copper sulfate-16% sulfuric acid boiling test (Strauss test) verifying complete solution heat treatment and zero carbide sensitization along grain boundaries. |
| Positive Material ID (PMI) | ASTM E1476 | 100% portable XRF elemental spectrometry on every pipe end to verify Cr, Ni, Mo, and Ti/Cu content before export dispatch, preventing alloy mix-ups. |
| Mechanical & Flattening | ASTM A370, ASTM A999 | Tensile strength, yield strength, elongation (≥ 35%), flattening test between parallel plates without cracking, flaring/flanging test. |
TeCarve operates strictly under certified ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 management systems. Every seamless pipe and tube delivery is accompanied by an authentic EN 10204 Type 3.1 Mill Test Certificate (MTC) detailing raw steel heat numbers, ladle chemistry, mechanical tensile/yield test results, and NDT and hydrostatic test records. Optional third-party witness inspection (SGS, Bureau Veritas, TÜV, DNV) is welcome upon request.
| Specification | Details |
|---|---|
| Outer Diameter | 6mm – 1600mm |
| Wall Thickness | 0.5mm – 100mm |
| Length | 1 meter to 12 meters (custom lengths available) |
| Grades | 304, 304L, 316, 316L, 321, 310S, 317L, 904L, Duplex 2205, etc. |
| Surface Finish | Annealed & Pickled, Polished, Bright Annealed, or as requested |
| Tolerances | According to international standards or customer specifications |
Get Your Seamless Pipe & Tube Quote
Sourcing seamless stainless steel pipe or tubing for high-pressure systems, chemical processing, heat exchangers, or critical fluid transfer? Contact our export sales desk for live mill pricing, custom schedule verification, and flexible trial orders (100–300 kg MOQ supported).
Instant mill pricing, scheduling, and billet stock availability directly from our sales engineering desk within 2 hours.
Short tube sample pieces provided for dimensional inspection, chemical verification, and surface finish evaluation.
Verify hydraulic bending parameters, machining tooling, or pilot projects with low-MOQ trial quantities before volume orders.
Complete heat traceability, chemical composition, tensile/yield properties, and ultrasonic/eddy-current NDT reports.
Standards
→ Scroll right for full chemistry & mechanical data
| Grade | US (UNS) | EN (W.Nr.) | Japan (JIS) | China (GB/T) | C % (Max) | Si % (Max) | Mn % (Max) | P % (Max) | S % (Max) | Cr % | Ni % | Mo % | Others | Tensile σb (Min.) | Yield σ0.2 (Min.) | Elongation (Min.) | Hardness (Max) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2205 Duplex* | S32205 | 1.4462 | SUS329J3L* | 022Cr23Ni5Mo3N* | 0.030 | 1.00 | 2.00 | 0.030 | 0.020 | 22.0-23.0 | 4.5-6.5 | 3.0-3.5 | N: 0.14-0.20 | 655 MPa (95 ksi) | 450 MPa (65 ksi) | 25% | ≤31 HRC / ≤293 HB |
| 304 | S30400 | 1.4301 | SUS304 | 06Cr19Ni10 | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-11.0 | — | — | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | ≤92 HRB / ≤215 HV |
| 304L | S30403 | 1.4307 | SUS304L | 022Cr19Ni10 | 0.030 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-12.0 | — | — | 485 MPa (70 ksi) | 170 MPa (25 ksi) | 35% | ≤92 HRB / ≤215 HV |
| 310S | S31008 | 1.4845 | SUS310S | 06Cr25Ni20 | 0.08 | 1.50 | 2.00 | 0.045 | 0.030 | 24.0-26.0 | 19.0-22.0 | — | — | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | ≤95 HRB / ≤215 HV |
| 316 | S31600 | 1.4401 | SUS316 | 06Cr17Ni12Mo2 | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 | — | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | ≤95 HRB / ≤215 HV |
| 316L | S31603 | 1.4404 | SUS316L | 022Cr17Ni12Mo2 | 0.030 | 0.75 | 2.00 | 0.045 | 0.005-0.017* | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 | — | 485 MPa (70 ksi) | 170 MPa (25 ksi) | 35% | ≤95 HRB / ≤215 HV |
| 317L | S31703 | 1.4438 | SUS317L | 022Cr19Ni13Mo3 | 0.030 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0-20.0 | 11.0-15.0 | 3.0-4.0 | — | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | ≤95 HRB / ≤215 HV |
| 321 | S32100 | 1.4541 | SUS321 | 06Cr18Ni11Ti | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 17.0-19.0 | 9.0-12.0 | — | Ti ≥ 5×(C+N) | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | ≤95 HRB / ≤215 HV |
| 904L* | N08904 | 1.4539 | N/A | 015Cr20Ni18Mo6CuN* | 0.020 | 1.00 | 2.00 | 0.045 | 0.035 | 19.0-23.0 | 23.0-28.0 | 4.0-5.0 | Cu: 1.0-2.0 | 490 MPa (71 ksi) | 215 MPa (31 ksi) | 35% | ≤90 HRB / ≤200 HV |
- Standards Conformance: manufactured to ASTM A213/A269/A312/A511/A789, EN 10216-5/10217-7, DIN 17456/17458, JIS G3459, and GB/T 14976.
- Delivery Condition: Solution Annealed & Pickled (AP) / Bright Annealed (BA) / Polished, or as requested.
- Mill Documentation: Full material test reports with complete heat-batch traceability supplied with every shipment.
- Controlled Sulfur Range & Notes: 316L S (Max) can be held to 0.005–0.017% upon request for high-precision orbital welding quality. *904L has no standard JIS designation; 904L and 2205 duplex GB/JIS cross-reference figures are compiled from secondary industry sources — please confirm exact specification and heat-specific mill test certificate with TeCarve for critical applications.
Features
• 100% seamless structure for higher pressure and corrosion resistance
• Uniform wall thickness and excellent ovality control
• Smooth inner surface, suitable for fluid and gas transmission
• Available in multiple stainless steel grades and sizes
• Precision production with strict dimensional tolerance
• Complies with international quality and safety standards
• Excellent weldability and machinability
• Chemical & Petrochemical Processing
• Heat Exchangers and Boilers
• Pharmaceutical and Food Processing Equipment
• Instrumentation and Control Systems
• Hydraulic and Pneumatic Lines
• Power Generation and Nuclear Plants
• Marine and Offshore Engineering
Applications
High-pressure sour gas (H2S) lines, offshore topsides, and subsea flowlines where weld-line failure risks cannot be tolerated under pressures up to 20 MPa. 316L and 2205 duplex.
Corrosive acid piping, nitric acid condensers, urea synthesis reactors, and organic solvent manifolds. High-alloy austenitic 304L, 316L, 317L, and 904L withstand localized pitting and intergranular corrosion.
High-temperature superheater headers, economizer piping, reheat steam tubes, and nuclear plant cooling circuits. Heat-resistant grades 321 and 310S deliver creep strength up to 1100°C.
Seawater reverse osmosis (SWRO) desalination, ship ballast systems, and offshore firewater rings. Duplex 2205 (PREN ≥ 35) provides double the mechanical strength and superior chloride pitting resistance.
Water for Injection (WFI), purified water distribution loops, and fermentation manifolds. Inner bright-annealed or electropolished finishes (Ra ≤ 0.25–0.4 μm) eliminate bacterial stagnation and ensure CIP/SIP cleanability.
Control panel pressure lines, subsea umbilical hydraulic tubes, and gas chromatography sampling loops. Precision cold-pilgered wall concentricity supports bursting pressures exceeding 40 MPa.
For application-specific material selection, explore our stainless steel solutions for oil and gas, chemical and petrochemical, and energy and power-generation systems.
For projects where a longitudinal weld is acceptable, compare this range with our Stainless Steel Welded Pipe & Tube.
For customized elbows, tees, flanges, and OEM precision-fabricated spools, see our Stainless Steel Highly Processed Pipe Fittings.
Need technical guidance on pressure limits, grain structure, and cost trade-offs? Review our engineering comparison in the Seamless vs Welded Pipe & Tube Guide.
For pressure-critical seamless tube projects, review how buyers can verify our partner factories, heat-treatment lines, NDT capability, and batch traceability before approving an order.
Quality Control
• 100% EN 10204 3.1 Mill Test Certificate (MTC) with complete heat-batch traceability
• 100% NDT (eddy current / ultrasonic) and hydrostatic testing per ASTM A312 / A999 and EN 10216-5
• Dimensional inspection, wall thickness micrometer verification, and surface finish assessment
• Raw material billet optical emission spectroscopy (OES) chemical verification
• Full solution annealing heat treatment with rapid quenching for intergranular corrosion resistance (ASTM A262 Practice E)
• Optional third-party inspection (SGS, BV, TÜV inspection & witness testing upon request)
Manufacturing Process
Seamless tube is produced at our Wenzhou partner factory (Zhejiang Qinghui Pipeline Technology Co., Ltd.) on a dedicated hot-piercing and cold-rolling line, from round billet to finished tube. Photos below are from the actual production floor.
Cold Drawn (Cold Pilgered) vs. Hot Finished (Hot Rolled) Seamless Pipe
Seamless stainless steel pipe conforming to ASTM A312 / EN 10216-5 is manufactured through two distinct primary routes: Cold-Finished (Cold Drawn / Cold Pilgered) and Hot-Finished (Hot Pierced & Extruded / Rolled). Selecting the correct manufacturing route directly impacts dimensional tolerance, wall thickness concentricity, surface roughness (Ra), and procurement economics.
| Technical Parameter | Cold Drawn / Cold Pilgered (CD / CP) | Hot Finished / Hot Rolled (HF / HR) | Engineering Selection Guidance |
|---|---|---|---|
| Forming Route & Mechanism | Solid round billet hot-pierced into hollow shell, pickled, then drawn through tungsten carbide conical dies over an internal plug/mandrel, or multi-roll cold pilger reduced at ambient temperature (<100°C). | Round billet heated to 1150°C–1250°C in a walking-beam furnace, cross-roll pierced on a Mannesmann mill, then hot elongated and sized through continuous mandrel mills at elevated heat (>900°C). | Cold drawing permits intermediate custom ODs and thin-wall ratios; hot rolling provides maximum throughput efficiency for standard heavy-wall pipes. |
| Dimensional Tolerance Precision | High precision: OD held to ±0.05 mm to ±0.15 mm (or ±0.5% per EN ISO 1127 Class D4). Wall thickness held to ±7.5% to ±10% (T3/T4). | Standard commercial limits per ASTM A999 Table 3 (OD ±0.79 mm to ±3.18 mm depending on NPS; WT -12.5% / +20% to +28%). | Specify Cold Drawn when tubesheet hole fit, compression fitting ferrules, or tight orbital welding alignment is required. |
| Wall Thickness Uniformity & Concentricity | Excellent concentricity: wall thickness eccentricity typically ≤ 5%–8%. Uniform bore profile minimizes localized fluid turbulence. | Moderate concentricity: wall thickness eccentricity typically 10%–15% due to high-temperature mandrel drift during piercing. | Cold drawn/pilgered tubing provides superior laminar flow stability and hydraulic efficiency in high-velocity lines. |
| Surface Roughness (Ra) & Cleanliness | Smooth, dense metallic surface: internal/external Ra ≤ 0.8 μm to 1.6 μm as-drawn. Capable of Ra ≤ 0.4 μm with bright annealing (BA) or electro-polishing. | Matte industrial finish: hot mill scale removed by acid pickling (AP / No. 1 finish); characteristic surface roughness Ra ≈ 3.2 μm to 6.3 μm. | Cold drawn is mandatory for pharmaceutical, high-purity gas, and food applications to avoid product residue and bacterial entrapment. |
| Grain Structure & Microstructure | Severe cold strain breaks up casting dendrites; subsequent solution annealing yields refined equiaxed austenitic grains (ASTM No. 7–9). | Dynamic recrystallization at high temperatures produces coarser austenitic grain boundaries (ASTM No. 3–5). | Fine grain size of cold-drawn tubing enhances yield strength consistency, high-cycle fatigue life, and stress corrosion cracking resistance. |
| Available Size & Wall Envelope | Unrivaled for small/medium ODs (6 mm to 219 mm) and thin to medium walls (WT 0.5 mm to 12 mm). Capable of high D/t and long continuous runs. | Optimal for medium to large diameters (NPS 2" to 24" / OD 60.3 mm to 610 mm) and heavy wall thicknesses (WT 6 mm to 50 mm+). | Use cold-drawn for precision heat exchanger and hydraulic tubes; use hot-rolled for heavy-wall process headers and main transmission lines. |
| Primary Industrial Applications | Heat exchangers, condenser tube bundles, instrumentation and impulse lines, CNG/hydrogen high-pressure lines, high-purity pharma tubing, hydraulic cylinders. | Offshore oil & gas process headers, petrochemical cracking furnaces, high-pressure steam distribution, power generation main steam lines, structural tubulars. | Both routes strictly conform to ASME Section II Part A material specifications when full solution annealing is verified on the EN 10204 3.1 MTC. |
packaging
PVC Wrapping
& End Caps
Custom Barcoding
& Labeling
Anti-Corrosion
& Moisture Protection
Seaworthy Wooden Cases & Pallets
Seamless Pipe Production & Export Photos
Real product, inspection, packaging and loading photos.
Tailored Solutions, Timely Fulfillment
CUSTOMIZATION
& DELIVERY
Flexible Custom Manufacturing
We tailor stainless steel seamless pipe and tube by outer diameter, wall thickness, custom length, material grade, surface finish, and dimensional tolerance for the intended pressure, temperature, or sanitary service.
Low MOQ & Rapid Prototyping
Unlike high-volume state mills requiring 3–10 tonne minimums, TeCarve supports 100–300 kg flexible trial orders for standard and custom ASTM A312 seamless pipes, enabling rapid quality qualification, piping spool prototypes, and emergency plant maintenance. Explore our partner factories’ production lines via Verify Our Partner Factories.
Optimized Lead Time
In-stock standard sizes ship within 7–10 days. Custom specifications typically ship within 10–25 days after deposit, depending on order volume, dimensions, and surface finish. The full cycle—from inquiry and drawing confirmation through sampling, production, inspection, and dispatch—typically takes 33–55 days for custom items.
Global Logistics & On-Time Delivery
For seamless pipe exports worldwide, we emphasize seaworthy wooden cases and pallets together with anti-corrosion and moisture protection for long-distance handling.
How your order is made, checked and shipped
Tube forming at the partner factory
Heat treatment (annealing)
Dimensional inspection
Alloy verification with a handheld analyzer
Export packing
Container loading
What Global Buyers Say About TeCarve Tubing
“I've received the goods and everything is fine.”
“The goods already send to customers. I am waiting for the next order from them.”
“…there is no need of inspection this time… I trust in your product.”
Frequently Asked Questions
What is stainless steel seamless pipe and how is it manufactured?
Stainless steel seamless pipe is manufactured from a solid round billet heated to 1150–1250°C and rotary-pierced into a hollow mother shell, then finished via cold pilgering (cold rolling) or cold drawing to exact dimensions.
Because it contains no longitudinal or spiral welded seam, seamless pipe eliminates weld decay risks and residual heat-affected zones (HAZ), delivering 20–30% higher allowable working pressures under ASME B31.3 / B31.1 piping codes. TeCarve supplies seamless pipe conforming to ASTM A312, ASTM A213, and EN 10216-5 in grades 304/304L, 316/316L, 321, 310S, 904L, and Duplex 2205.
What size range and wall thickness schedules are available for seamless stainless pipe?
TeCarve supplies seamless stainless steel pipe from NPS 1/8 in (OD 10.3 mm) to NPS 24 in (OD 610.0 mm) across full ASME/ANSI B36.19M and B36.10M schedules, including Schedule 5S, 10S, 40S/STD, 80S/XS, 160S, and XXS (wall thicknesses from 0.89 mm to 59.54 mm). Precision cold-drawn tubing is also available down to 6.0 mm OD.
Standard delivery lengths are 6.0 m (20 ft) single random; double-random (11.8–12.0 m) and custom precision cut-to-length options (±1.0 mm) are available for direct piping spool prefabrication.
What dimensional tolerances apply to ASTM A312 seamless stainless steel pipe?
ASTM A312 seamless stainless pipe conforms to the general requirements of ASTM A999 / A999M:
- OD Permissible Variations: NPS 1/8 to 1-1/2 in (+0.40 mm / -0.79 mm, or ±0.40 mm for cold-drawn); NPS 2 to 4 in (±0.79 mm); NPS 5 to 8 in (+1.59 mm / -0.79 mm); NPS 10 to 18 in (+2.38 mm / -0.79 mm); NPS 20 to 24 in (+3.18 mm / -0.79 mm).
- Wall Thickness Limit: Minimum wall at any point must not be more than 12.5% below nominal thickness (-12.5% under; over-thickness governed by weight limits +10% / -3.5% to -5%).
- Straightness & Global Standards: Maximum straightness variation is ≤ 3.2 mm per 3.0 m (1/8 in in 10 ft). International orders can also be manufactured to EN ISO 1127 (D3/T3, D4/T4) or JIS G3459 standards.
What are the differences between cold pilgering and cold drawing for seamless tubes?
Cold Pilgering (Cold Rolling): Uses reciprocating tapered dies and a stationary mandrel to achieve 70–80% cross-sectional reduction per pass. It produces exceptional wall thickness uniformity (wall variations within ±7.5% to ±10%), high concentricity, and low residual stress, making it ideal for high-pressure boilers, nuclear applications, and heat exchanger tubes.
Cold Drawing: Pulls the tube through an outer die and over an internal plug at room temperature. This route delivers tighter outside diameter accuracy (down to ±0.05 mm), a very smooth outer surface finish (Ra ≤ 0.4–0.8 μm), and greater flexibility for non-standard custom dimensions.
What is the MOQ, quality certification, and delivery lead time for seamless stainless pipe?
Small-Batch MOQ & Lead Time: TeCarve supports flexible 100–300 kg trial orders for standard and custom ASTM A312 seamless piping to assist engineering verification and emergency repairs. In-stock standard sizes dispatch within 7–10 days; custom production runs ship in 10–25 days.
Quality & Testing Documentation: Every production lot is accompanied by an authentic EN 10204 Type 3.1 Mill Test Certificate with full heat-batch traceability. Mandatory quality verification includes hydrostatic testing (up to 20 MPa / 2,900 psi) or eddy current NDT per ASTM A999 / ASTM E426.
Are Material Test Certificates (EN 10204 3.1) charged extra?
No. An authentic EN 10204 3.1 Material Test Certificate issued by our partner factory QC department is included free of charge with every shipment. It details heat numbers, chemical melt analysis, tensile properties, and hydrostatic pressure results.
Can we verify the partner manufacturing facilities before ordering?
Yes. We provide scheduled 1-on-1 live video factory audits via Zoom, Teams, or WhatsApp. Buyers can inspect our Wenzhou partner factory piercer, cold rolling mills, solution annealing furnaces, hydrostatic testing, and PMI spectroscopy in real time.
What non-destructive testing is performed on seamless pipes?
Every pipe undergoes NDT per standard or order (eddy current or ultrasonic testing) to ensure volumetric integrity. Hydrostatic testing is conducted per standard or customer order, supported by automated test benches rated up to 20–30 MPa.
Contact TeCarve