080M40 — alloy Steel: Composition, Properties & Applications

Also known as: 080M40
BS EN steel grade 080M40.

CHEMICAL COMPOSITION
C:0.38-0.43;Si:0.15-0.35;Mn:0.75-1.00;Cr:0.80-1.10;Mo:0.15-0.25;P:≤0.035;S:≤0.040

MECHANICAL PROPERTIES
Tensile:≥450 MPa;Yield:≥280 MPa;Elongation:≥20%

TYPICAL APPLICATIONS
UK standard grades

AVAILABLE FORMS
Bar,Plate

STANDARDS & EQUIVALENT GRADES
BS 080M40; BS EN

HEAT TREATMENT
Austenitize at 820–870 °C (oil or water quench depending on section) and temper at 400–650 °C to the required strength/toughness balance.

PROCESSING PRECAUTIONS
Preheat and control interpass temperature when welding; post-weld heat treatment or stress relief is recommended to avoid hard-zone cracking. Use low-hydrogen electrodes. Protect from decarburization during heating (controlled atmosphere or protective coating).

SOURCE & SUPPLY
Shanxi Youte Steel stocks 080M40 in bars, plates, pipes and forgings with mill test certificates, cut-to-length service and export packaging. Contact our team for quotations and technical data sheets.