Grade overview

Nominally a medium-carbon Cr-Mo steel with good hardenability and response to quench-and-temper heat treatment.

Typical applications

Shafts, gears, couplings, bolts, tooling, oilfield components, machinery parts and heavy-duty mechanical components.

Equivalent / related designations

Often compared with EN 42CrMo4. The two are similar in family but not automatically interchangeable across all products and standards.

Common manufacturers and supply

Produced by specialty bar and forging mills including Ovako, Saarstahl, Daido, CITIC Special Steel and many regional alloy-steel producers.

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.