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.

Flange

Welding Neck Flange

Forged steel flanges — welding-neck, slip-on, socket-weld, threaded and blind — for high, medium and low pressure piping.

Material / Standard: ASTM A105 / A182 F11/F22/F304/F316/F347; A350 LF2; carbon, alloy, stainless
Size range: 1/2" - 60" (DN15 - DN1500)
Pressure / Wall: Class 150 - Class 2500 / PN 6 - PN 420

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.

Referenced standards

ASTM A105

Standard title: Standard Specification for Carbon Steel Forgings for Piping Applications
Issuing body: ASTM International

Similar / alternate materials

Service conditions for the listed grade are limited. The following alternates are commonly specified when temperature, medium or pressure deviates. Final selection must be reviewed by a qualified materials engineer.

From base：ASTM A105 / A182 F11/F22/F304/F316/F347Carbon-steel forging family: general-purpose flanges ambient ~ 425°C; low-temp service pairs A350 LF2.

Upgrade paths

ASTM A105 / A182 F11/F22/F304/F316/F347 →ASTM A350 LF2 (与 A420 WPL6 配套)

For low-temperature service A105 should be replaced by A350 LF2 (paired with A420 WPL6 fittings).

Reference only — confirm against project spec, NACE, PED / ASME requirements.

Typical industry applications

How procurement teams typically deploy this material/category in real projects. Compare against your project spec before locking the BOM.

Oil & Gas PipelinesOnshore crude / gas trunk lines: API 5L X42 and below pair with A234 WPB; X52-X70 must pair with MSS SP-75 WPHY-52/60/65/70 (yield-strength match). Service window -29 to +120°C (B31.4 / B31.8 onshore practice).
Water & Fire ProtectionMunicipal water, cooling-water loops, fire mains; carbon steel with galvanizing or epoxy lining.
LNG / CryogenicPropane / LPG (~-46°C) → A420 WPL6; ethylene (~-101°C) → A420 WPL3; LNG (-162°C) / liquid nitrogen (-196°C) butt-weld fittings step up to A420 WPL8 (Ni 8.4–9.6%, commonly called 9% Ni).

Standards and Materials

The following supports product selection and RFQ communication. Final requirements follow drawings, standards and purchase documents.

CategoryFlange

Material / StandardASTM A105 / A182 F11/F22/F304/F316/F347; A350 LF2; carbon, alloy, stainless

Size range1/2" - 60" (DN15 - DN1500)

Pressure / WallClass 150 - Class 2500 / PN 6 - PN 420

ScopeForged steel flanges — welding-neck, slip-on, socket-weld, threaded and blind — for high, medium and low pressure piping.

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Frequently asked questions

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.