What standards does Hebei Haihao manufacture pipe elbow 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 pipe elbow?

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.

Pipe Elbow Manufacturer | Hebei Haihao Group

Name: Hebei Haihao Group Huadian High Pressure Pipe Fittings Co., Ltd.
Address: Donglin Industrial Zone, Mengcun County, Cangzhou, Hebei, 061400, CN
Telephone: +86 132 9342 5333

Since 1982 · Pressure piping components manufacturerReply in 4 h+86 132 9342 5333 haihaojituan@163.com

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Pipe Elbow Manufacturer | Hebei Haihao Group

Similar / alternate materials

This product covers multiple base grades. Alternates below are grouped by base family — each card is an upgrade path FROM the labeled base grade when service conditions move outside its envelope. Final selection must be reviewed by a qualified materials engineer.

From base：ASTM A234 WPB/WP11/WP22Carbon-steel family: ambient ~ 425°C; outside this band, switch to alloy or low-temp steel.

Upgrade paths

ASTM A234 WPB/WP11/WP22 →ASTM A420 WPL6

Switch to A420 WPL6 when service temp ≤ -29°C (Charpy at -46°C); WPB is not qualified for low temperature.

ASTM A234 WPB/WP11/WP22 →ASTM A234 WP11 / WP12

For creep range (~450-540°C) move to 1.25Cr-0.5Mo (WP11) or 1Cr-0.5Mo (WP12).

ASTM A234 WPB/WP11/WP22 →ASTM A234 WP22

For high-temp creep / hydrogen service use 2.25Cr-1Mo (WP22), common in hydrotreaters and boiler reheat.

ASTM A234 WPB/WP11/WP22 →ASTM A234 WP91

Ultra-supercritical main steam / 540-620°C zones use 9Cr-1Mo-V (Grade 91).

ASTM A234 WPB/WP11/WP22 →ASTM A420 WPL3

Selection window: MDMT between -101°C and -46°C (colder than WPL6, warmer than 9% Ni). Charpy at -150°F (-101°C); typical for ethylene and deep cryogenic propane lines.

ASTM A234 WPB/WP11/WP22 →ASTM A420 WPL8 (9% Ni, 8.4–9.6%)

LNG (-162°C) / liquid nitrogen (-196°C) butt-weld fittings use ASTM A420 WPL8 (Ni 8.4–9.6%, commonly called 9% Ni; Charpy at -320°F / -196°C); matching pipe A333 Gr.8, forgings A522.

From base：A403 WP304/WP316/WP347Austenitic stainless family: general chemical / food / pharma; chloride, seawater or strong acid require duplex / nickel alloys.

Upgrade paths

A403 WP304/WP316/WP347 →ASTM A403 WP316L

Chloride service (Cl⁻ > 50 ppm, especially T > 60°C): use 316L; higher chloride or temperature still risks SCC — upgrade to duplex.

A403 WP304/WP316/WP347 →ASTM A815 WP-S31803 (Duplex 2205)

Seawater / high chloride / moderate temperature butt-weld fittings: duplex 2205 (A815 WP-S31803), PREN ≈ 35, better pitting resistance than 316L. A182 F51 covers forgings/flanges.

A403 WP304/WP316/WP347 →ASTM A815 WP-S32750 (Super Duplex 2507)

Offshore / FPSO / water injection wellhead: super duplex 2507 (A815 WP-S32750), PREN ≈ 42–43 (industry SDSS threshold ≥ 40). A182 F53 covers forgings/flanges.

A403 WP304/WP316/WP347 →ASME SB-366 / ASTM B366 (Inconel 625 / Incoloy 825)

Strong acid / high-temp sour / hydrogen service: upgrade to Inconel 625 (UNS N06625, WPNCMC) or Incoloy 825 (UNS N08825, WPNICMC).

A403 WP304/WP316/WP347 →

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

Pipe Elbow

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Similar / alternate materials

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