From bevel and CVN to SMYS, PSL2, stencil and wall tolerance: a buyer-oriented glossary of steel pipe terms explaining what each one changes about your order — and how to write an unambiguous line item.
Line pipe standards decoded: why API 5L and ISO 3183 are near-twins, X-grades versus L-grades, PSL1 vs PSL2 quality divide, where the standards diverge, and how EN 10204 3.1/3.2 certificates decide acceptance on EU projects.
ASTM A333 buying guide: grades 1 to 9 and their MDMT floors, why Grade 6 dominates, CVN impact testing at temperature, A333/6 vs A106-B, mandatory normalizing, and the cold-service companion grades (A420 WPL6, A350 LF2, A320 L7).
PED 2014/68/EU is the EU law for pressure equipment above 0.5 bar. This guide covers scope, categories I to IV, conformity modules, approved materials, EN 10204 3.1 MTCs, and what to specify when buying pressure steel for the EU.
EN 1090 is the EU gateway for structural steel. This guide explains EN 1090-1/-2, execution classes EXC1 to EXC4, CE marking, the Declaration of Performance, and what to specify when buying structural steel for the European market.
What A671 and A672 Are — and Why LSAW Mills Care ASTM A671 and A672 cover electric-fusion-welded (EFW) pipe made from pressure-vessel-quality plate, with filler metal added (submerged-arc welding in practice — the LSAW process). The two specifications differ only in design temperature: A671 for atmospheric-temperature service (roughly −20 °F to +90 °F ambient duty)
The Standards Map for Forged Steel Products A forged round bar, block or disc rarely ships with just one standard on the certificate — it carries a family: a general-delivery standard for the forging itself, a steel-grade standard defining chemistry and mechanical properties, a heat-treatment convention, and an ultrasonic testing standard. Chinese mills quote them
One Family, Four Names Carbon and low-alloy boiler tubes travel under four standard families depending on where the plant was engineered: EN 10216-2 (Europe, seamless), DIN 17175 (the German classic that EN 10216-2 superseded — still specified on thousands of running plants), GB/T 5310 (China, seamless high-pressure boiler tube, current edition 2023) and the ASME
Why Three Standards Describe “The Same Pipe” Ask for “1 inch galvanized pipe” in Lagos, Rotterdam or Shanghai and you will touch three different standards. BS 1387 is the classic British standard for steel tubes suitable for screwing with BS 21 (now ISO 7-1) threads — decades of Commonwealth-era infrastructure still specifies it. Its European
The Standards Behind Each Coating System External anti-corrosion coatings are qualified by system-specific standards, and the region of your project usually decides which one governs. Knowing the map prevents the classic mistake of quoting “3PE” without naming the standard, wall surface preparation, or test regime. System Governing Standards Notes 3PE (3-layer polyethylene) DIN 30670 ·