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管件·法兰·软管总成

管件分三个各具优势的产业带：河北孟村做碳钢弯头/三通/大小头与法兰，按 ASME 或 DIN 生产；浙江温州做不锈钢卫生级与仪表管阀件；浙江玉环做黄铜与电镀类民用小管件。一个柜里混装三地货源很常见，真正的风险是标准混用（如 SCH20 与 SCH40、PN 与 Class 150 的对应关系）。

产业带

河北沧州孟村——碳钢对焊管件与法兰主产区；浙江温州——不锈钢卫生级管阀件；浙江玉环——中低压管件与黄铜接头

典型产品

Butt-weld elbow / tee / reducerForged fittingSlip-on / weld-neck flangeStainless sanitary fitting & ferruleHose clamp / camlock couplingHydraulic bite-type fitting

材质

ASTM A234 WPB / WPCA105 / A350 LF2 forgingsSS 304 / 316 / 316L / 2205Brass HPb59-1

表面工艺

Black / phosphateHot-dip galvanisedPickled & passivatedPolished Ra ≤ 0.8 (sanitary)

报价会引用的标准

ASME B16.9 / B16.5 / B16.11DIN 2605 / EN 1092-1GB/T 124593-A / EHEDG for sanitary (where claimed)

规格参考表

参数项	需要约定的内容
Size range	DN15–DN600 butt-weld; 1/2"–4" forged; DN10–DN1200 flanges
Schedule	SCH20 / SCH40 / STD / XS / SCH80 / XXS (declare the mapping)
Facing	RF, FF, RTJ, tongue-and-groove
Bolt circle	Per EN 1092-1 or ASME B16.5 — never mix
Wall tolerance	±12.5% on nominal per B16.9 for most sizes
Marking	Heat number, standard, material grade, size stamped on each piece
MTR	Mill test report EN 10204 3.1 on request

常规起订量：Standard sizes 1–5 tonnes per item; flanges typically 50–200 pcs per size; custom castings 300–500 pcs；常规交期：20–40 days for standard items; galvanising or machining adds 7–15 days。

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买家常见问题

Can I combine carbon-steel fittings and stainless sanitary fittings in one shipment?

Yes, buyers routinely consolidate Mengcun carbon-steel goods with Wenzhou stainless goods through one consolidator. Keep them on separate packing lists and declare materials per line, and avoid storing stainless against hot-dip galvanised parts during sea freight to prevent contact corrosion.

What does PN16 correspond to in ASME classes?

PN ratings and Class ratings are not one-to-one; the mapping depends on temperature. A PN16 EN flange and a Class 150 ASME flange often share bolt holes only approximately, so request the drilling drawing when replacing across standard systems rather than assuming equivalence.