China Stainless Steel

stainless steel
welded pipe & tube

TeCarve is a manufacturer-backed welded stainless steel pipe supplier serving industrial, structural and decorative fabrication requirements. The range covers TIG, plasma, laser and ERW welded pipe and tube in grades 201, 202, 304, 304L, 316, 316L, 409, 410, 430 and Duplex. Outer diameters from 6 mm to 4200 mm, wall thicknesses from 0.5 mm to 120 mm, lengths up to 12 meters and customized finishes are available.

For custom welded tube dimensions, finishes, and production coordination, see our custom stainless steel tube fabrication service.

Polished stainless welded tube ends
Buyer Essentials & Procurement Terms

High-Strength Welded Stainless Steel Tubing: Precision Weld Seams & Bright Annealing

Controlled weld seam options, protective bright annealing, and flexible FOB or DDP door delivery from our Foshan partner factory.

1
Full Standard Coverage: ASTM A312 (industrial piping) and ASTM A554 (mechanical & ornamental tubing) in grades 304, 304L, 316, and 316L.
2
Bright Annealed & Controlled Weld Seam: Supplied as-welded, bright annealed, or cold-reduced per customer ordering requirements.
3
Flexible FOB & DDP Delivery: Landed cost certainty with DDP door delivery, EN 10204 3.1 MTC standard, and trial orders from 100–300 kg.
MOQ
Standard tubing: 100–300 kg (trial orders welcome); custom slitting/forming evaluated per order
Lead Time
Stocked sizes: 7–10 days; custom production runs: 10–25 days
Samples
Standard free samples ship in 48 hours; custom samples in 5–7 working days
Documents
EN 10204 3.1 MTC included; 3.2 / third-party inspection (SGS/BV/TÜV) on request

Specifications

Available Sizes by Standard

Markets: N. America, S. America, Middle East EPC, oil & gas (welded pipe · NPS/Sch)

NPSSchOD (mm)WT (mm)OD Tol.WT Tol.
1/8"10S10.31.24+0.4mm / −0.8mm+20.0% / −12.5%
1/2"10S21.32.11+0.4mm / −0.8mm+20.0% / −12.5%
3/4"10S26.72.11+0.4mm / −0.8mm+20.0% / −12.5%
1"10S33.42.77+0.4mm / −0.8mm+20.0% / −12.5%
1"40S33.43.38+0.4mm / −0.8mm+20.0% / −12.5%
2"10S60.32.77+0.8mm / −0.8mm+20.0% / −12.5%
2"40S60.33.91+0.8mm / −0.8mm+20.0% / −12.5%
4"10S114.33.05+1.6mm / −0.8mm+22.5% / −12.5%
4"40S114.36.02+1.6mm / −0.8mm+15.0% / −12.5%
8"10S219.13.76+2.4mm / −0.8mm+22.5% / −12.5%
12"10S323.94.57+2.4mm / −0.8mm+22.5% / −12.5%
24"10S610.06.35+3.2mm / −0.8mm+17.5% / −12.5%

OD tolerance per ASTM A999/A999M-23 Table 3; wall thickness tolerance per ASTM A312/A312M-24 Table 3. For welded pipe, the weld area is not limited by the Table 3 positive wall allowance.

  • Supply Length / Form: Fixed lengths 1–12m; custom lengths and cut-to-length available
  • Available Grades: 304, 304L, 316, 316L, 321, 409, 410, 430, etc.
  • Surface Finish: Annealed & pickled, polished, bright annealed, or as requested
  • Tolerance Compliance: Per ASTM A999 (pipe) / A554 (tube), EN ISO 1127, JIS G3448, or GB/T general tolerance tables

ASTM A249/A249M — Welded Heat-Exchanger Tube Reference

OD bandRepresentative ODA1016/A1016M OD toleranceA249 wall tolerance
Under 1in19.05mm (3/4in)±0.004in [±0.10mm]±10% nominal wall
1–1 1/2in, incl.25.40–38.10mm±0.006in [±0.15mm]±10% nominal wall
Over 1 1/2–2in44.45mm (1 3/4in)±0.008in [±0.20mm]±10% nominal wall
2–2 1/2in60.33mm (2 3/8in)±0.010in [±0.25mm]±10% nominal wall
3–4in, incl.76.20–101.60mm±0.015in [±0.38mm]±10% nominal wall

S2 option: when the purchaser specifies S2, minimum-wall requirements of ASTM A1016/A1016M apply instead of the nominal-wall requirement; tubes must be marked S2.

Section 14.2 weld-wall limit: wall at the weld must not exceed the wall measured 90° from the weld by more than 6% of that measured wall or 0.004in [0.1mm], whichever is greater. This limit does not apply when wall is over 12% of OD, wall is over 0.165in [4.2mm], OD is over 3in [76.2mm], or Table 4 minimum yield strength is at least 35ksi [240MPa].

Verified against ASTM A249/A249M-04a §14.1/§14.2; confirm the edition incorporated by the purchase order.

Markets: N. America — ornamental, structural & mechanical welded tube (round tube · OD-based)

OD range (in)WT range (in)OD Tol. ±
Under 1/20.020–0.0490.004in [0.10mm]
1/2–10.020–0.0650.005in [0.13mm]
1/2–1over 0.065–0.1340.010in [0.25mm]
Over 1–1 1/20.025–0.0650.008in [0.20mm]
Over 1–1 1/2over 0.065–0.1340.010in [0.25mm]
Over 1 1/2–20.025–0.0490.010in [0.25mm]
Over 1 1/2–2over 0.049–0.0830.011in [0.28mm]
Over 1 1/2–2over 0.083–0.1490.012in [0.30mm]
Over 2–2 1/20.032–0.0650.012in [0.30mm]
Over 2–2 1/2over 0.065–0.1090.013in [0.33mm]
Over 2–2 1/2over 0.109–0.1650.014in [0.36mm]
Over 2 1/2–3 1/20.032–0.1650.014in [0.36mm]
Over 2 1/2–3 1/2over 0.1650.020in [0.51mm]
Over 3 1/2–50.035–0.1650.020in [0.51mm]
Over 3 1/2–5over 0.1650.025in [0.64mm]
Over 5–7 1/20.049–0.2500.025in [0.64mm]
Over 5–7 1/2over 0.2500.030in [0.76mm]

ASTM A554-21 Table 2, round tube. Scope: OD up to 16in [406.4mm], wall from 0.020in [0.51mm]. Wall thickness tolerance is ±10% of specified wall (Table 2 footnote A).

  • Supply Length / Form: Fixed lengths 1–12m; custom lengths and cut-to-length available
  • Available Grades: 304, 304L, 316, 316L, 321, 409, 410, 430, etc.
  • Surface Finish: Annealed & pickled, polished, bright annealed, or as requested
  • Tolerance Compliance: Per ASTM A999 (pipe) / A554 (tube), EN ISO 1127, JIS G3448, or GB/T general tolerance tables

Markets: Europe, Middle East — welded stainless-steel tubes for pressure purposes

OD (mm)WT (mm)OD Tol.WT Tol.
17.22.0±0.30mm±0.20mm (±10.0%)
21.32.3±0.30mm±0.23mm (±10.0%)
26.92.3±0.30mm±0.23mm (±10.0%)
33.72.6±0.30mm±0.26mm (±10.0%)
48.32.6±0.36mm (±0.75%)±0.26mm (±10.0%)
60.32.9±0.45mm (±0.75%)±0.29mm (±10.0%)
76.12.9±0.57mm (±0.75%)±0.29mm (±10.0%)
114.33.6±0.86mm (±0.75%)±0.36mm (±10.0%)
168.34.0±1.26mm (±0.75%)±0.40mm (±10.0%)
219.16.3±2.19mm (±1.0%)±0.63mm (±10.0%)
355.68.0±3.56mm (±1.0%)±0.80mm (±10.0%)
508.010.0±5.08mm (±1.0%)±1.00mm (±10.0%)

Conforms to BS EN 10217-7:2014 Table 10. Outside diameter tolerance: Class D3 (±0.75% or ±0.30mm, whichever is greater) for D ≤ 168.3mm; Class D2 (±1.0%) for D > 168.3mm. Wall thickness tolerance: Class T3 (±10.0% or ±0.20mm, whichever is greater).

  • Supply Length / Form: Fixed lengths 1–12m; custom lengths and cut-to-length available
  • Available Grades: 304, 304L, 316, 316L, 321, 409, 410, 430, etc.
  • Surface Finish: Annealed & pickled, polished, bright annealed, or as requested
  • Tolerance Compliance: Per ASTM A999 (pipe) / A554 (tube), EN ISO 1127, JIS G3448, or GB/T general tolerance tables

Markets: Japan, Southeast Asia — light-gauge welded pipe for ordinary piping

DesignationOD (mm)WT (mm)OD Tol. (Any Pt. / Mean)WT Tol.
8Su9.520.7+0 / −0.37mm±0.12mm
10Su12.700.8+0 / −0.37mm±0.12mm
13Su15.880.8+0 / −0.37mm±0.12mm
20Su22.221.0+0 / −0.37mm±0.12mm
25Su28.581.0+0 / −0.37mm±0.12mm
30Su34.01.2±0.34mm (Mean ±0.20mm)±0.12mm
40Su42.71.2±0.43mm (Mean ±0.20mm)±0.12mm
50Su48.61.2±0.49mm (Mean ±0.25mm)±0.12mm
60Su60.51.5±0.60mm (Mean ±0.25mm)±0.15mm
75Su76.31.5±0.76mm (±1%) / Mean ±0.5%±0.15mm
80Su89.12.0±0.89mm (±1%) / Mean ±0.5%±0.30mm
100Su114.32.0±1.14mm (±1%) / Mean ±0.5%±0.30mm
125Su139.82.0±1.40mm (±1%) / Mean ±0.5%±0.30mm
150Su165.23.0±1.65mm (±1%) / Mean ±0.5%±0.40mm
200Su216.33.0±2.16mm (±1%) / Mean ±0.5%±0.40mm
250Su267.43.0±2.67mm (±1%) / Mean ±0.5%±0.40mm
300Su318.53.0±3.19mm (±1%) / Mean ±0.5%±0.40mm

Conforms to JIS G3448:2022 Table 4 for light-gauge stainless steel pipes for ordinary piping. Wall thickness tolerances: 8–50Su ±0.12mm; 60–75Su ±0.15mm; 80–125Su ±0.30mm; 150–300Su ±0.40mm. OD tolerances include maximum/minimum diameter limits and mean outside diameter tolerances.

  • Supply Length / Form: Fixed lengths 1–12m; custom lengths and cut-to-length available
  • Available Grades: 304, 304L, 316, 316L, 321, 409, 410, 430, etc.
  • Surface Finish: Annealed & pickled, polished, bright annealed, or as requested
  • Tolerance Compliance: Per ASTM A999 (pipe) / A554 (tube), EN ISO 1127, JIS G3448, or GB/T general tolerance tables

Markets: China domestic & Belt-and-Road / Chinese-contracted EPC projects — welded fluid pipe

OD (mm)WT (mm)OD Tol.WT Tol.
61.0±0.30mm±0.10mm (±10%S)
142.0±0.30mm±0.20mm (±10%S)
252.5±0.30mm±0.25mm (±10%S)
343.0±0.30mm±0.30mm (±10%S)
453.5±0.40mm±0.35mm (±10%S)
764.0±0.50mm±0.40mm (±10%S)
1084.0±1.00mm±0.40mm (±10%S)
1594.5±1.00mm±0.45mm (±10%S)
2196.0±2.19mm (±1.0%D)±0.60mm (±10%S)
2737.0±2.73mm (±1.0%D)±0.70mm (±10%S)
3779.0±3.77mm (±1.0%D)±0.90mm (±10%S)
63012.0±4.41mm (±0.7%D)±1.20mm (±10%S)

Conforms to GB/T 12771-2019 Table 1. Values shown reflect Ordinary Class (B) tolerances per Section 5.2.4; High-Precision Class (A) tolerances available upon request. Wall thickness tolerance is ±10%S across all sizes.

  • Supply Length / Form: Fixed lengths 1–12m; custom lengths and cut-to-length available
  • Available Grades: 304, 304L, 316, 316L, 321, 409, 410, 430, etc.
  • Surface Finish: Annealed & pickled, polished, bright annealed, or as requested
  • Tolerance Compliance: Per ASTM A999 (pipe) / A554 (tube), EN ISO 1127, JIS G3448, or GB/T general tolerance tables

Markets: Large-diameter welded pipe for low-/medium-temperature and corrosive service where heat treatment is not needed to obtain corrosion resistance

OD rangeNominal WT rangeOD toleranceWT toleranceSpecified lengthStraightness
3–48in [75–1200mm]0.062–0.500in [1.57–12.70mm]Applicable ASTM A999/A999M table±12.5% (§10.4)Not under; max. +1/4in [6.35mm] (§10.1)Max. 0.25in [6.35mm] gap on 10ft [3m] straightedge (§10.2)

ASTM A778/A778M-15. §8.1 does not require heat treatment — the defining characteristic of this standard. §15.1 marking must include HT-O, indicating material not heat treated. Grades are limited to TP304L, TP316L, TP317L, TP321, and TP347. Projects requiring post-weld heat treatment or radiographic examination should use A312/A358/A409 (§1.1). Confirm the edition incorporated by the purchase order.

  • Supply Length / Form: Fixed lengths 1–12m; custom lengths and cut-to-length available
  • Available Grades: 304, 304L, 316, 316L, 321, 409, 410, 430, etc.
  • Surface Finish: Annealed & pickled, polished, bright annealed, or as requested
  • Tolerance Compliance: Per ASTM A999 (pipe) / A554 (tube), EN ISO 1127, JIS G3448, or GB/T general tolerance tables

For high-pressure or critical-corrosion duties that require no weld seam, compare with our Stainless Steel Seamless Pipe & Tube.

Comparing longitudinal seam integrity against extrusion methods? Read our full Seamless vs Welded Pipe & Tube Guide.

Mill Direct Supply & Rapid Quotation

Get Your Welded Pipe Quote

Sourcing welded stainless steel pipe or tubing for industrial piping, heat exchangers, structural framing, or sanitary lines? Contact our export sales desk for live factory pricing, wall thickness confirmation, and low-risk trial orders (100–300 kg MOQ supported).

⚡ Direct Mill Pricing

Instant pricing, production scheduling, and inventory availability directly from our sales engineering desk within 2 hours.

🔬 Free Sample Pieces

Short tube sample pieces provided for physical dimension check, weld seam flattening test, and surface finish evaluation.

⚖️ 100–300 kg Flexible Trial

Test machinery tooling, bending parameters, or project prototypes with low-MOQ trial quantities before full container commitments.

📋 Full EN 10204 3.1 MTC

Complete heat-number traceability, chemical analysis, mechanical tensile/yield reports, and eddy-current NDT documentation.

Have welded tube specifications ready for review?
Chat directly on WhatsApp or submit your RFQ to sales@tecarve.com:

Standards

→ Scroll right for full chemistry & mechanical data

GradeUS (UNS)EN (W.Nr.)Japan (JIS)China (GB/T)C % (Max)Si % (Max)Mn % (Max)P % (Max)S % (Max)Cr %Ni %Mo %Tensile σb (Min.)Yield σ0.2 (Min.)Elongation (Min.)Hardness (Max)
304S304001.4301SUS30406Cr19Ni100.080.752.000.0450.03018.0-20.08.0-11.0—515 MPa (75 ksi)205 MPa (30 ksi)35%≤92 HRB / ≤215 HV
304LS304031.4307SUS304L022Cr19Ni100.0300.752.000.0450.03018.0-20.08.0-12.0—485 MPa (70 ksi)170 MPa (25 ksi)35%≤92 HRB / ≤215 HV
316S316001.4401SUS31606Cr17Ni12Mo20.080.752.000.0450.03016.0-18.010.0-14.02.0-3.0515 MPa (75 ksi)205 MPa (30 ksi)35%≤95 HRB / ≤215 HV
316LS316031.4404SUS316L022Cr17Ni12Mo20.0300.752.000.0450.03016.0-18.010.0-14.02.0-3.0485 MPa (70 ksi)170 MPa (25 ksi)35%≤95 HRB / ≤215 HV
321S321001.4541SUS32106Cr18Ni11Ti0.080.752.000.0450.03017.0-19.09.0-12.0—515 MPa (75 ksi)205 MPa (30 ksi)35%≤95 HRB / ≤215 HV
409S409001.4512SUS409022Cr12Ti0.031.001.000.0400.02010.5-11.75——380 MPa (55 ksi)205 MPa (30 ksi)20%≤88 HRB / ≤190 HV
410S410001.4006SUS41012Cr130.151.001.000.0400.03011.5-13.5——450 MPa (65 ksi)205 MPa (30 ksi)20%≤96 HRB / ≤210 HV
430S430001.4016SUS43010Cr170.121.001.000.0400.03016.0-18.0——450 MPa (65 ksi)205 MPa (30 ksi)22%≤89 HRB / ≤200 HV
  • Standards Conformance: ASTM A249/A269/A270/A312/A554/A778 · EN 10217/10296/10312 · DIN 17455/11850 · JIS G3448/G3463 · GB/T 12771 / GB 19228
  • Delivery Condition: Solution Annealed & Pickled (AP) / Bright Annealed (BA) / Polished, or as requested.
  • Mill Test Certificate: 100% full material traceability with EN 10204 3.1 MTC provided with every shipment.

Features

• Superior corrosion resistance for harsh environments

• Available in decorative, sanitary, and structural grades

• High dimensional accuracy and smooth weld seams

• Cost-effective alternative to seamless pipes in low-pressure systems

• Custom finishes and cutting services available

For welded tube used in process, sanitary, or marine systems, see how to verify TeCarve's welding, inspection, and order-traceability process, including optional third-party witnessing.

Quality Control

Weld Seam Examination & Finish: How to Specify It

Weld-seam NDT must be named in the order with its coverage, acceptance criterion and inspection document. Eddy-current testing is an electromagnetic method commonly specified for surface/near-surface discontinuities; radiographic examination is specified when the project requires a volumetric image of the weld. EN 10217-7 explicitly makes the weld-seam NDT method an ordering choice (Table 16). ASTM A312 certification must state whether hydrostatic or nondestructive electric testing was performed, and, for NDT, the practice and reference discontinuities used.

For heat-exchanger tubing, ASTM A249 sets a weld reinforcement limit and requires finished tubes to be chemically descaled or pickled after final heat treatment; bright-annealed material does not require pickling. Where a smooth cosmetic or sanitary surface is required, specify weld-bead dressing/polishing, finish, roughness target and inspection method separately rather than assuming them from the base pipe standard.

Welded pipe is often an economical choice for larger diameters and general corrosive/process service when the specified weld examination and product standard are met. Seamless pipe remains appropriate where the design code, pressure, cyclic-duty assessment or customer specification calls for a weld-free product. TeCarve’s stated management-system certifications are ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018.

• Raw material sourcing from certified stainless steel mills

• Weld-seam examination to the ordered standard and purchase order (eddy-current or radiographic examination where required)

• Hydrostatic or nondestructive electric testing when required by the ordered standard or project specification

• Surface finish inspection and dimensional verification

• Third-party inspection available for export standards

packaging

PVC Wrapping
& End Caps

Custom Barcoding
& Labeling

Anti-Corrosion
& Moisture Protection

Seaworthy Wooden Cases & Pallets

Tailored Solutions, Timely Fulfillment

CUSTOMIZATION
& DELIVERY

Flexible Custom Manufacturing

We customize stainless steel welded pipe and tube by diameter, wall thickness, length, surface finish, material grade, and the required TIG, plasma, laser, or ERW welding type.

Low MOQ & Rapid Prototyping

MOQ is as low as 100–300 kg for flexible trial orders, with small batch customization and sample production supported, helping you shorten your development cycle and market entry.

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 welded pipe shipments worldwide, PVC wrapping and end caps protect finished surfaces while seaworthy wooden cases and pallets support secure transport.

How your order is made, checked and shipped

1 Forming stands on a welded stainless tube mill

Tube forming at the partner factory

2 Annealing furnace at operating temperature

Heat treatment (annealing)

3 Caliper measuring polished tube outside diameter

Dimensional inspection

4 Handheld alloy analyzer screen showing a chemical composition result

Alloy verification with a handheld analyzer

5 Tubes in kraft paper with blue end caps in a lined case

Export packing

6 Tube bundles in woven bags loaded in a container

Container loading

Buyer Feedback & Acceptance

What Global Buyers Say About TeCarve Tubing

“I've received the goods and everything is fine.”

— Tommy, Nigeria
Delivery Confirmation & Material Acceptance

“The goods already send to customers. I am waiting for the next order from them.”

— Khalid, Indonesia
Commercial Reorder & Distribution Partner

“…there is no need of inspection this time… I trust in your product.”

— Carmen, Chile
Pre-Shipment Inspection Waiver & Quality Trust

Frequently Asked Questions

How is stainless steel welded pipe manufactured?

Stainless steel welded pipe is formed by rolling flat strip into a tube and joining the seam by TIG (GTAW) or laser welding, followed by annealing and bright-annealing for a clean, uniform finish. TeCarve sources from partner factories using automated TIG welding for consistent seam integrity across all production runs.

What grades are available for welded stainless steel pipe?

We supply welded stainless steel pipe in grades 201, 202, 304, 304L, 316, 316L, 409, 410, 430, and duplex stainless steel, conforming to ASTM A249, ASTM A269, ASTM A270, ASTM A312, ASTM A554, ASTM A778, EN 10217, EN 10296, EN 10312, DIN 17455, and DIN 11850.

What surface finishes are available for welded stainless steel pipe?

Available finishes: 2B (mill), No. 4 (brushed/satin), No. 8 (mirror), BA (bright annealed), and Ra ≤ 0.8 µm polished for sanitary service. Internal polishing to Ra ≤ 0.4 µm is available for pharmaceutical-grade tube.

What are typical applications for welded stainless steel pipe?

Welded stainless steel pipe is ideal for food processing, dairy, pharmaceutical, water treatment, HVAC, decorative and architectural piping, and low-to-medium-pressure industrial systems where cost efficiency is important.

Can I order custom lengths and wall thicknesses for welded pipe?

Yes. Custom lengths up to 12 m, non-standard wall thicknesses, and end treatments (beveled, plain, threaded, flanged) are available. Flexible trial orders starting from 100–300 kg are supported for standard and custom specifications; contact TeCarve sales for a quote.

Can TeCarve supply both FOB and DDP prices for welded pipes?

Yes. We offer FOB, CIF, CFR, and DDP (Delivered Duty Paid) commercial terms. DDP quotes include ocean freight, customs clearance, and inland trucking, providing transparent landed cost.

Are welded tubes available with bright annealing and weld bead control?

Yes. We supply as-welded, welded and annealed (bright annealed in protective atmosphere), and cold-reduced conditions per customer ordering requirements and standard specifications.

What standards govern TeCarve's welded stainless steel pipes?

We supply welded stainless steel piping and tubing conforming to ASTM A312 (industrial fluid systems) and ASTM A554 (mechanical and structural applications). Every order includes an authentic EN 10204 3.1 Material Test Certificate.

Contact TeCarve

Get in touch with TeCarve for premium stainless steel tubing solutions. Global delivery, factory-direct supply from two partner factories, and reliable service. If any need, please send email to sales@tecarve.com.