Cangzhou Flange Manufacturers
China's largest flange and pipe fitting production cluster — Mengcun County, Cangzhou, Hebei — manufactures ASME B16.5, B16.9, and EN 1092 products for export worldwide. Here's what buyers need to know.
The Cangzhou–Mengcun PVF Cluster
Mengcun County, within Cangzhou City in Hebei Province, is recognized internationally as China's primary hub for carbon steel flange and pipe fitting manufacturing. The cluster accounts for an estimated 60–70% of China's flange export volume and a significant share of global ASME B16.5 supply for the NPS ½"–24" range.
Nearby Yanshan County (also Cangzhou) specializes in buttweld fittings — elbows, tees, reducers, caps — primarily to ASME B16.9. Together these two counties represent a vertically integrated supply chain that has been refined over 50 years of export-oriented production.
Browse the cluster: Mengcun Pipe Fittings · Yanshan Flange
Products Manufactured
Flanges (Mengcun)
- Weld Neck (WN) — ASME B16.5 / B16.47
- Slip On (SO)
- Blind (BL)
- Socket Weld (SW)
- Threaded (TH)
- Lap Joint (LJ)
- Orifice, Reducing, Long Weld Neck (specialty)
Pipe Fittings (Yanshan)
- 90° and 45° LR / SR Elbows — ASME B16.9
- Equal and Reducing Tees
- Concentric and Eccentric Reducers
- Pipe Caps
- Stub Ends (Lap Joint Ends)
- MSS SP-75 high-yield fittings for oil & gas
Standards Covered
- ASME B16.5 (flanges NPS ½–24, Class 150–2500)
- ASME B16.47 (large flanges NPS 26–60)
- ASME B16.9 (buttweld fittings)
- EN 1092-1 / DIN 2631–2638
- JIS B2220
- BS 4504
Materials Available
- Carbon steel: A105, A234 WPB, A516 Gr.70
- Stainless: 304/304L, 316/316L, 321, 347
- Alloy steel: F11, F22, F91, F5, F9
- Duplex / super duplex: F51, F53, F55, F60
- Nickel alloys (selected factories): Inconel, Hastelloy
What to Verify Before Ordering
1. Certifications and Scope
Request the factory's ISO 9001 certificate and check the scope — a factory certified "for flanges to Class 600" is not automatically certified for Class 2500. For PED (EU Pressure Equipment Directive) compliance, verify the CE Declaration of Conformity and notified body involvement for Category II/III equipment.
2. Material Traceability
Specify that Mill Test Reports (MTRs) accompany every heat/lot and include heat number, chemical analysis, mechanical properties, and heat treatment records. Chinese factories can and do produce proper MTRs — but only if your PO explicitly requires them with applicable standard reference (ASTM A961 for flanges).
3. Dimensional and Visual Inspection
Third-party pre-shipment inspection (SGS, Bureau Veritas, Intertek) should include dimensional check against ASME B16.5/B16.9 tables, hardness testing, visual inspection per MSS SP-55, and marking verification. Budget $400–800 per inspection for a standard container lot.
4. Correct Incoterms and Packaging
FOB Tianjin or FOB Qingdao are the standard terms from Cangzhou-area factories. Ensure pipe end protection caps and anti-rust treatment are included in the packing spec — carbon steel flanges can corrode significantly during 30-day sea transit without proper protection.
Featured Mengcun Suppliers
Selected exporters from the Mengcun–Cangzhou industrial belt, ranked by export track record.Request quotes from all →
Hebei Jiuyuan Pipeline Manufacturing Co., Ltd.
河北玖源管道制造有限公司
Hebei Beifang Yizao Pipeline Co., Ltd.
河北北方一造管道有限公司
Cangzhou Xinguangde Pipe Fitting Manufacturing Co., Ltd.
沧州鑫广德管件制造有限公司
Guohua Heavy Industry Co., Ltd.
国华重工有限公司
Request a Quote from Cangzhou Suppliers
Use our weight calculators to generate accurate specifications, then submit an inquiry. We work with verified Cangzhou-area factories for ASME B16.5 flanges and B16.9 fittings.
Frequently Asked Questions
Why is Cangzhou famous for flanges and pipe fittings?
Cangzhou, and specifically Mengcun County, has been producing carbon steel flanges since the 1970s. Decades of cluster development means the full supply chain — forging, machining, heat treatment, testing, and export documentation — is concentrated within a 30 km radius, driving down costs and lead times.
What standards do Cangzhou manufacturers produce to?
Most established Cangzhou factories produce to ASME B16.5 and B16.47 (flanges), ASME B16.9 (buttweld fittings), EN 1092-1, DIN standards, and JIS B2220. Many hold ISO 9001, PED (EU), and CRN (Canada) certifications. Always confirm the specific standard and edition in your purchase order.
What materials are available from Cangzhou suppliers?
Carbon steel (ASTM A105, A234 WPB, A516), stainless steel (304, 304L, 316, 316L, 321), alloy steel (A182 F11, F22, F91, F5), and duplex grades (F51, F53) are all commonly manufactured. Carbon steel dominates volume; exotic alloys are available but require careful mill verification.
How do I verify a Cangzhou factory's certifications?
Request ISO 9001 certificates directly with the certificate number, then verify against the issuing body's online database (e.g., Bureau Veritas, SGS, TÜV). For ASME stamps, verify through the ASME manufacturer's directory at asme.org. Always include third-party inspection (SGS, Bureau Veritas, Intertek) in your PO for first orders.
What is the typical lead time for flanges from Cangzhou?
Standard carbon steel flanges in ASME B16.5 Class 150–900: 3–6 weeks ex-works for common sizes. High-pressure Class 1500/2500, large bore (16"+), or exotic alloys: 6–12 weeks. Container loading and sea freight to European or US ports typically adds 25–35 days.