Grade overview

Typically a low-carbon microalloyed steel using controlled rolling or TMCP to achieve the required strength without relying on high carbon content.

Typical applications

Long-distance gas and oil pipelines, offshore pipelines and high-pressure transmission systems.

Equivalent / related designations

Welding procedure qualification, toughness, DWTT where specified, sour-service requirements and coating compatibility are major project controls.

Common manufacturers and supply

Major suppliers include Nippon Steel, JFE, POSCO, ArcelorMittal-related operations, China Baowu and other qualified line-pipe steel mills.

Fabrication and selection notes

Confirm the exact product standard, edition, dimensions, delivery condition, mechanical properties, impact requirements, heat treatment, welding procedure, corrosion environment and certification. A grade name alone is not sufficient for procurement or design approval.

QA/QC documentation

For critical service, verify heat number traceability, mill test certificate, chemical analysis, tensile/impact results where required, NDT, heat-treatment record and project-specific third-party inspection requirements.

Element Folio engineering reference. Values and requirements vary by standard edition, product form and manufacturer; always verify the latest governing specification.