For purchasing managers, technical directors, and operations teams who need specification-compliant carbon steel pipe with traceable quality, predictable lead times, and a supply partner that can handle volume.
For purchasing managers, technical directors, and operations teams who need specification-compliant carbon steel pipe with traceable quality, predictable lead times, and a supply partner that can handle volume.
โ 20+ countries served | โ ISO 9001 certified | โ Full mill test certificates
Every day your piping project is delayed, your budget bleeds. Here's what procurement teams repeatedly struggle with โ and what it costs them.
When you buy through ten agents, each adds 3โ7% margin. A โค200-ton pipe order can carry $12,000โ$18,000 in hidden markups before it reaches your port.
Without direct mill access, you struggle to deliver custom lengths, ODs, and coatings. Projects get re-tendered โ and margins shrink by 15โ20%.
Loose packing, wrong export docs, or a missed vessel = demurrage of $4,000โ$6,000/day. One Texas refinery client lost 11 production days waiting on customs clearance last year.
Non-traceable mill certifications and micro-cracks below the NDT threshold have led to rework costs of $38,000 per project on average in the energy sector. One buyer's 6" piping batch failed a third-party PMI test entirely.
These aren't isolated events โ they're the ugly symptoms of unreliable supply chains. There's a better way.
We are a platform-based, supply-chain-managed enterprise specializing in the manufacturing and integrated supply of carbon steel pipes, flanges, elbows, tees, reducers, and malleable cast iron fittings. With exports to 20+ countries including the United States, Russia, Canada, Kazakhstan, Algeria, and across the Middle East and Europe, we deliver what many traders can't: factory-direct economics with engineering-grade quality.
Custom pipe lengths, coatings, end preparations, and packaging to match your engineering drawings.
ISO 9001, CE, and third-party inspections (SGS/BV/TรV) on request. Material traceability EN 10204 3.1/3.2.
Cangzhou's proximity to Tianjin Port enables 7โ10 day FOB loading. We manage all export docs, packing, and customs clearance.
Comprehensive specifications for pipe used in industrial piping networks: power, oil & gas, chemical, structural, and water treatment.
| Parameter | ASTM A106 / A53 / API 5L | Typical Values (Grade B) |
|---|---|---|
| Standard | ASTM A106 (Seamless, High-Temp), ASTM A53 (Seamless/Welded), API 5L (Line Pipe) | A106 Gr. B most common |
| Size Range (NPS) | 1/8" โ 48" (DN6 โ DN1200) | 1/2" โ 24" stock items |
| Wall Thickness / Schedule | SCH 10, 20, 40, STD, 80, XS, 160, XXS | SCH 40 (for โค10" NPS) |
| Chemical Composition (max %) | C: 0.30, Mn: 1.06, P: 0.05, S: 0.05, Si: 0.10 min | Meets A106 / A53 / API 5L |
| Mechanical Properties | Tensile: โฅ60,000 psi (415 MPa) | Yield: โฅ35,000 psi (240 MPa) |
| Pressure Rating | Per ASME B31.1 / B31.3 | Up to ~2,900 psi (SCH 40, 300ยฐF) |
| Temperature Range | A106: up to 1,000ยฐF (538ยฐC); A53: up to 750ยฐF | -20ยฐF to 1,000ยฐF (with de-rating) |
| Testing & Inspection | Hydrostatic, NDT (UT/ET), PMI, Bend, Flattening | Full MTC per EN 10204 3.1 |
*Custom sizes, grades, and long-length pipes (up to 12m) available upon request. Contact us for a full datasheet.
Understanding how pipe components behave under pressure, temperature, and structural load is key to specifying the correct product. Here's what decades of mechanical engineering research tells us.
As established in the Elbow Stress Indices Using Finite Element Analysis conference paper, a pipe bend's cross-section tends to deform significantly in and out of its end plane when an external load is applied โ an effect known as shell-type ovalization.
This curved geometry gives elbows much greater flexibility than straight pipe but also creates stress intensification factors that must be accounted for in ASME B31.3 / B31.1 design calculations.
๐ Source: Academia.edu โ Elbow Stress Indices Using FEA
For tee connections, the Sustained Stress Indices at Tee Connections in Piping Systems paper (ScienceDirect) explains that calculation of sustained stress in piping is typically based on nominal stresses over the straight pipe cross-section, multiplied by sustained stress indices (SSI). These are used in beam-type analyses to estimate primary stress intensification at discontinuities like tees.
If your system relies on tees for branch lines, proper pressure de-rating is critical.
๐ Source: ScienceDirect โ Sustained Stress Indices at Tee Connections
A 2025 study in the Cureus Journal of Engineering, Performance Material Selection in Rigid Flange Coupling Systems, offers a decision matrix for optimizing material choices based on operating conditions โ reducing both over-specification waste and in-service failure risks.
Meanwhile, the Optimal Design of 6in Offshore Flange Connector's Sealing Structure research (DOI: 10.21278/brod75207) demonstrated that optimized flange geometries can increase contact pressure while decreasing equivalent stress โ leading to better sealing performance and lower breakage risk.
๐ Sources: Cureus & DOI: 10.21278/brod75207
The paper A Simplified Nonlinear Dynamic Model for Pipe Structures with Bolted Flange Joints (Journal of Sound and Vibration, 2012) shows that the nonlinear contact behavior at flange interfaces can be captured through equivalent stiffness representations โ enabling rapid system-level dynamic analysis without expensive full-contact simulations.
For rotating equipment or flow-induced vibration scenarios, this is why flange joint integrity cannot be ignored in system design.
๐ Source: ScienceDirect โ Journal of Sound and Vibration
According to the Standard Tee Fitting Branch Flow Engineering Principles (2025 Guide), a standard tee has three openings of the same size in a 'T' shape, allowing a 90-degree branch to be taken from a straight run. A reducing tee serves a similar purpose but with a smaller branch opening, enabling a smaller pipe diameter without an additional reducer fitting.
Similarly, a reducer coupling joins pipes of two different sizes with a larger female thread on one end and a smaller one on the other. Every elbow and tee directs flow, while sockets and couplings extend or join pipe runs โ the fundamental mechanical vocabulary of any fluid transport system. As the guide emphasizes, choosing the right fitting saves labor, reduces fitting counts, and lowers pressure drop.
๐ Source: 2025 Ultimate Guide โ Malleable Pipe Fittings
The true test of a pipe supplier is not just what they show on a brochure โ it's what happens on the production floor. Here's a look at ours.
Material incoming inspection โ Verify mill certificates, chemical composition, and trace heat numbers.
Dimensional inspection โ OD, ID, wall thickness, length, straightness, and end bevel angles checked against ANSI/ASME B36.10M / B16.5.
Mechanical testing โ Tensile, yield, elongation, hardness (Brinnel), and impact testing (Charpy at -20ยฐF) per applicable standards.
NDT / Hydrostatic testing โ 100% hydrostatic pressure test per API 5L / A106; UT spot checks available on request.
Independent third-party inspection โ SGS, BV, TรV, Intertek, or customer-nominated inspectors welcome. We've hosted inspectors from Oil+Giant, Exxon, Shell, and Aramco tier suppliers.
ISO 9001 ยท CE ยท UL ยท GS ยท RoHS ยท and more โ available for review upon request.
From oil fields to water treatment plants โ real applications with measurable results from our customers.
Client: Midland, TX midstream operator
Product: API 5L Gr. B, 8" SCH 40, 40 ft lengths, PE-coated
Result: 19% faster installation due to precise bevels and consistent OD tolerance.
Client: EPC contractor, Kazakhstan
Product: ASTM A106 Gr. B seamless, 6" SCH 80, 12m random lengths
Result: Passed third-party UT with 0 rejects; delivered 2 weeks ahead of schedule.
Client: Municipal contractor, Alberta, Canada
Product: ASTM A53 Gr. B ERW, 12" SCH 10, galvanized ends
Result: 30% lower total landed cost vs. local distributor quote.
Client: Forklift manufacturer, Germany
Product: A53 Gr. B seamless, 2" โ 4" SCH 80, cold-drawn precision pipe
Result: Zero PPM rejects over 6 consecutive shipments in 2025.
Straight answers from our engineers and sales team.
Yes. All pipes can be supplied with EN 10204 3.1 mill test certificates as standard. For 3.2 certification, we coordinate with an independent third-party inspection agency (SGS, BV, TรV, or Intertek) at an additional cost. We also provide PMI (Positive Material Identification) reports on request.
For stock sizes (1/2"โ12" SCH 40/80), MOQ is 5 tons. For non-standard sizes or custom lengths, MOQ is 20โ25 tons depending on the diameter and wall thickness. Lead times: in-stock items ship within 7โ10 days; production orders typically take 30โ45 days after deposit confirmation.
Absolutely. We offer custom cutting to exact lengths (e.g., ยฑ2mm tolerance), bevelling per API 5B or customer drawings, threaded ends, full or partial coatings (FBE, 3PE, galvanized), and custom packaging. As a factory, we handle OEM/ODM requirements seamlessly. Just share your drawing or spec.
We offer FOB Tianjin/Cangzhou, CFR, and CIF terms. We work with major ocean carriers (COSCO, Maersk, MSC) and handle all export documentation: commercial invoice, packing list, bill of lading, certificates of origin, and any required inspection certificates.
ASTM A106 is specifically a seamless carbon steel pipe designed for high-temperature service (up to 1,000ยฐF). ASTM A53 is a welded or seamless pipe for general mechanical and pressure applications, approved for temperatures up to 750ยฐF. A106 Gr. B is most commonly used in refinery, power, and high-pressure fluid applications; A53 is often sufficient for lower-pressure structural and utility piping.
We accept T/T (30% deposit, 70% balance against the B/L copy or before shipment), L/C at sight for large orders, and Western Union for sample orders. For new buyers, our standard terms are clearly written in the sales contract. No hidden fees.
Absolutely. We provide free small samples (uncoated, random length) โ the customer only pays for shipping. For custom-coated, cut-to-length samples, we charge a nominal production fee, refundable on the first order.
Real feedback from buyers across the US, Europe, and beyond.
"We needed 20ft A106 Gr.B pipes with beveled ends for a quick turnaround in Alberta. Weihuan delivered in 11 days from deposit to our warehouse, including cold-weather packaging. That's faster than some domestic US mills quoted us."
"I ordered flanges, elbows, tees, and reducers with the pipe to test their one-stop capability. The entire shipment arrived perfectly sorted and labelled โ our warehouse crew saved hours of sorting."
"The pricing beat our previous supplier by 17%. We did a full inspection with a third-party lab in the US and the wall thickness tolerance was tighter than the spec required."
Get a detailed quotation with freight, a lead time proposal, and full mill test certificates โ typically within 24 hours.
โก Urgency: Q2 steel production slots fill quickly โ
currently booking AugustโSeptember shipments.
๐ก๏ธ Risk-free: Free samples available ยท Third-party inspection accepted ยท No payment without approval.
Screenshots from our WhatsApp/Email exchanges with recent buyers โ shared with permission.
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๐ค Trusted by Industry Leaders
We've shipped to over 20 countries, with repeat orders from many of the world's most demanding buyers.
"We ordered 300 tons of A106 Gr. B plus flanges and elbows for a refinery upgrade. The material quality was consistent โ our third-party inspector gave it a 100% pass rate. The shipping was arranged so smoothly that we didn't touch a single export document."
"We were skeptical about importing from China. But the team at Weihuan sent us a complete batch of MTCs, photos, and even a live video inspection. The pipes arrived in Rotterdam on schedule with zero damage."
*Names and company details anonymized for confidentiality. Full references available on request.