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319 articles

合金弯头 (2).jpgNormes
Normes

ASTM A182: Forged Alloy and Stainless Piping Components

ASTM A182 covers forged low-alloy and stainless steel flanges, fittings, valves, and parts for high-temperature service. This guide explains what buyers must specify beyond the standard, including grade, heat treatment, and dimensional standards.

10 oct. 20266 minHebei Haihao Group
不锈钢管.jpgTechnique
Technique

Weld Repair Acceptance for Wrought Steel Fittings

Weld repair acceptance for A234 and other wrought steel fittings is governed by the product specification, A960/A960M common requirements, and the purchase order — not by a generic visual pass/fail rule. Here's what to verify.

6 oct. 20268 minHebei Haihao Group
水暖管件.jpgNormes
Normes

ASME B16.39 Malleable Iron Pipe Unions: Classes and Tests

ASME B16.39 covers threaded malleable iron unions in Classes 150, 250, and 300, including design, ratings, materials, threads, and tests. This guide explains what EPC engineers and procurement managers must verify when specifying these unions.

2 oct. 20265 minHebei Haihao Group