Frequently Asked Questions (FAQ)
Welcome to TeCarve’s FAQ page. Below you’ll find answers to the most commonly asked questions about our stainless steel pipes & tubes, manufacturing capabilities, quality standards, and global shipping. Our goal is to support your business with high-quality products and reliable service.
How Ordering Works
- Enquiry — Send your specs, drawings or target grade to our team; we typically respond within 24-48 hours.
- Quotation & Confirmation — We confirm grade, dimensions, standard, MOQ (typically 100-300 kg) and finalize pricing.
- Sample (if required) — For custom or first-time orders, samples ship with a Mill Test Certificate for your approval.
- Production — Standard items ship in 7-10 days; custom orders typically take 10-25 days after deposit.
- Documentation & Payment — We provide EN 10204 3.1 or 3.2 mill certificates; payment accepted via T/T, L/C or Western Union.
- Shipping — Export-grade packaging (anti-corrosion wrap, seaworthy crates) and global logistics to 50+ countries.
TeCarve is a manufacturing-backed stainless steel pipe & tube solutions provider, resource integrator, stockist that offers Seamless Tube, Welded Tube, Heat Exchanger Tube, Sanitary Tube, Capillary Tube, Needle Tube, Coiled Tube, Thick-Walled Tube, Square Tube, Rectangular Tube, Special-Shaped Tube, Oval Tube, Low Fin Tube, Flexible/Corrugated Pipe, Decoration Tube.
Backed by years of manufacturing & international trade experience, TeCarve delivers more than stainless steel pipe & tube— we deliver trust, speed, and customized service to meet the exact needs of global clients.
TeCarve is the dedicated export and sourcing arm for two manufacturing partners in China: Foshan Shengxin Machinery Technology Co., Ltd. (佛山市晟昕机械科技有限公司, est. 2019, USCC 91440605MA5397EU1N) in Foshan, Guangdong, and Zhejiang Qinghui Pipeline Technology Co., Ltd. (浙江清辉管道科技有限公司, est. 2023, USCC 91330301MAC9M90285) in Wenzhou, Zhejiang. TeCarve itself is the trading name of TeCarve Tech Co., Ltd. (杭州钛刻科技有限公司, USCC 91330185MAEBLF4H29), established in Hangzhou in 2025 to unify export operations for both facilities. Registration details for both partners are independently verifiable via the National Enterprise Credit Information Publicity System (gsxt.gov.cn).
See how to verify us yourself — book a live video factory audit, review our audit checklist, and see the in-house and third-party testing behind every order.
Our factories are located in Foshan And Wenzhou, China—key industrial hubs for high-precision stainless steel tubing.
Foshan: Danzao Town, Nanhai District, Foshan.
Products: Welded/Coiled/Heat Exchange/Sanitary Pipe & Tube
Wenzhou: Xinghai Subdistrict, Wenzhou Economic and Technological Development Zone, Wenzhou
Products: Seamless/Coiled/Heat Exchange/Sanitary/Thick-walled Pipe & Tube
We manufacture a wide range of stainless steel pipes & tubes including:
Seamless Pipes & Tubes
Welded Pipes & Tubes
Heat Exchanger Pipes & Tubes
Sanitary Tubes
Capillary Tubes
Needle Tubes
Coiled Tubes
Thick-Walled Pipes
Square Pipes & Tubes
Rectangular Pipes & Tubes
Special-Shaped Pipes & Tubes
- Oval Pipes & Tubes
- Low Fin Tubes
Decorative Pipes & Tubes
We mainly use 304, 304L, 316, 316L, 321, 310S, 201, 430, 904L and duplex 2205 stainless steel grades, depending on customer requirements and specific application needs.
Yes, we specialize in international trade. All our products meet international standards such as ASTM, DIN, EN, and ISO, and are packed for sea and air shipment with full documentation support.
We have the capacity to manufacture over 10,000 tons of stainless steel tubing annually, supporting both bulk and customized orders.
We follow strict quality control through in-house laboratories and third-party inspections. Our QC process includes chemical analysis, mechanical testing, hydrostatic pressure testing, eddy current testing, dimensional inspection, and heat exchanger tube inspection, with third-party verification available from SGS, Bureau Veritas, TÜV Rheinland, or Intertek on request.
Yes, we provide EN 10204 3.1 or 3.2 Mill Test Certificates with every batch, ensuring full traceability and material authenticity.
Our stainless steel tubing is widely used in the following industries:
Oil & Gas
Chemical & Petrochemical
Food & Beverage
Pharmaceutical & Medical
Energy & Power
Automotive & Transportation
Architecture & Interior Decoration
Machinery & Industrial Equipment
HVAC & Heat Exchangers
Marine & Shipbuilding
We offer a variety of surface finishes including:
Pickled and Annealed
Polished (180/240/320/400 Grit)
Mirror Finish (Bright Annealed)
Matte or Satin Finish
Custom finishes on request
Absolutely. We offer customized solutions for special-shaped tubes, non-standard diameters, wall thicknesses, and lengths based on your drawings or specifications.
Learn more about our custom stainless steel tube fabrication service, from technical evaluation through production and dispatch.
The full process from inquiry to delivery typically takes 33–55 days, covering sampling, drawing confirmation, and production. Once your order enters production (after deposit), production itself typically takes 10–25 days. In-stock standard items ship in 7–10 days.
Our MOQ is usually 100–300 kg depending on the product type, but we can accommodate smaller trial orders for new customers.
We offer export-standard packaging including:
Plastic caps on tube ends
Bundled with plastic film
Wooden boxes or crates
Custom packaging on request
We accept T/T, L/C, Western Union.
Yes, we export to over 50 countries, including the USA, Germany, UAE, Brazil, India, and more. We can handle FOB, CIF, CFR, EXW, FCA, DAP, and DDP terms as required.
Please send us your inquiry with detailed specifications, including size, grade, quantity, and destination port. Our sales team will reply within 24 hours.
Yes, our experienced engineers provide material selection advice, technical documentation, and application-specific consultation.
What Is Included in an EN 10204 Mill Test Certificate?
A 3.1 certificate is issued by the manufacturing facility's own QC department and is standard on every TeCarve order. It ties directly to the specific heat/batch number of the tubes delivered, and includes chemical composition (re-verified in-house by OES spectrometer against the upstream mill's original mill certificate — TeCarve sources raw material from established Chinese mills such as Tsingshan and TISCO), mechanical property results, dimensions, and the applicable manufacturing standard (e.g. ASTM A312, EN 10216-5).
A 3.2 certificate is available on request for pressure equipment or specified engineering projects: a third-party inspector nominated by the customer (SGS, TÜV Rheinland, or Bureau Veritas) attends the mill in person to witness sampling, mechanical testing, and non-destructive testing, then co-signs the certificate alongside TeCarve's QC lead. It is not automatically included on every order — let us know at inquiry stage if your project requires 3.2.
Does Eddy Current Testing Matter for Tube Quality?
Yes — eddy current testing (ECT) catches surface and near-surface flaws (cracks, pinholes, inclusions) that are invisible to the eye and that a hydrostatic test alone can miss on thin-wall tube. TeCarve runs industrial multi-channel eddy current inspection to ASTM A1016 / ASTM A450 / EN 10246, with automatic demagnetization and defect alarm, on every heat exchanger tube and high-pressure seamless tube batch — this is 100% inline coverage, not spot sampling.
How Is Dimensional Tolerance Verified Before Shipment?
Outer diameter is checked with precision micrometers and vernier calipers; wall thickness is verified with a point micrometer and cross-checked by ultrasonic thickness gauge; tube ends are checked against Go/No-Go gauges; cut length is confirmed with a laser rangefinder plus a high-precision steel tape as a second check. Composition traceability is handled separately — see the mill test certificate section above.
Why Does Pitting Corrosion Happen in Chloride Environments?
Stainless steel resists corrosion because of a thin, self-healing chromium oxide passive film on its surface. Chloride ions can locally break down this passive film, exposing bare metal at a tiny spot. That exposed spot becomes anodic relative to the surrounding intact surface, so corrosion concentrates there instead of spreading evenly — the pit deepens rather than the surface simply thinning, and chlorides tend to concentrate further inside the pit as it grows, which is why pitting can perforate a tube wall faster than uniform corrosion would.
Risk increases with higher chloride concentration, higher temperature, lower pH, and stagnant or evaporating conditions (droplets and waterline zones concentrate chlorides). This is why pitting shows up most often in seawater, brackish water, cooling water, and CIP/SIP cleaning chemical exposure.
Grade selection matters
304/304L is adequate for general, low-chloride service. 316L adds molybdenum, which meaningfully improves pitting and crevice resistance in chloride-bearing environments such as chemical processing, coastal atmosphere, and aggressive CIP/SIP cleaning. For seawater immersion or high-chloride service, duplex grades such as 2205 offer a further step up in pitting and crevice resistance over 316L. TeCarve supplies 304, 304L, 316, 316L, and 2205 duplex tube — contact our team with your fluid chemistry and temperature to confirm the right grade for your service condition.
Over export operations since 2019
ISO 9001 certified production
Reliable supply for OEM & custom projects
Competitive pricing & global delivery
Fast response and English-speaking support team