What standards does Hebei Haihao manufacture welding neck flange to?

We produce to ASTM/ASME (A234 WPB / WPC / WP1 / WP11 / WP12 / WP22 / WP91; A403 stainless; A420 WPL6 low-temperature), EN (EN 10253 (Parts 1–4)), JIS (B2311 / B2312 / B2313), GB (GB/T 12459 / GB/T 13401) and MSS SP-75 high-strength low-alloy. Final material and standard are confirmed by drawing or RFQ.

What is the maximum size capability for welding neck flange?

Bends up to Φ2200 mm large diameter; pushed and pressed fittings up to DN1500 with 100 mm wall thickness; forged flanges up to Φ4000 mm; single-piece forging up to 50 tons. Exact capability is confirmed by drawing and material grade.

What inspection and quality documents are provided?

Standard package: EN 10204 3.1 material certificate, chemical analysis, mechanical test report, dimensional inspection report, NDT report (PT/MT/UT/RT as required), heat-treatment record, packing list. Third-party witness (SGS / BV / TÜV / Lloyd's) is available on request.

What is the typical lead time?

Standard fittings in common sizes: 15-30 days. Non-standard sizes or special materials: 30-60 days. Large-diameter pushed fittings and forged flanges: 45-90 days. Prefabricated piping spools depend on drawing complexity. Exact lead time is confirmed against current production schedule when the RFQ is received.

What certifications does Hebei Haihao hold?

ISO 9001 quality management, ISO 14001 environmental management, ISO 45001 occupational health & safety, ABS Type Approval for flanges and fittings, and a national manufacturing license for pressure-piping components. Full certificate images are available on the Certificates page.

What Incoterms and payment terms are supported?

We support FOB, CFR and CIF. Accepted payment: irrevocable L/C at sight only. Final terms are agreed per order value and ongoing relationship.

Welding Neck Flange Manufacturer

Description

Hebei Haihao Group manufactures welding neck flanges in carbon, alloy and stainless steel from forged blanks, machined to ASME B16.5, B16.47, EN 1092-1, GB/T 9112-9124 and JIS / DIN equivalents. Suitable for both pipe-to-pipe and pipe-to-equipment connections including reducer-gear flanges.

Applications

Oil & gas, refinery and petrochemical plants, power generation, chemical and pharmaceutical, shipbuilding and offshore, pressure vessel and equipment connections.

Technical specs

Standards: ASME B16.5 / B16.47, MSS SP-44, EN 1092-1, GB/T 9112-9124, JIS B2220, DIN 2627-2638. Material: ASTM A105 / A182 F11/F22/F304/F316/F347; A350 LF2; carbon, alloy, stainless. Size range: 1/2" - 60" (DN15 - DN1500). Pressure: Class 150 - Class 2500 / PN 6 - PN 420. Faces: RF / FF / RTJ / Tongue-Groove / Male-Female. NDT: visual, dimensional, RT/UT/PT/MT and PMI on request.