Seamless Steel Pipes

Frequently asked questions

What standards does Hebei Haihao manufacture seamless steel pipes to?

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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 seamless steel pipes?

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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?

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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?

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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?

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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?

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