4340 36CrNiMo4 1.6511 817M40 SNCM439

4340 36CrNiMo4 1.6511 817M40 SNCM439

AISI 4340 steel is a medium carbon, low alloy steel known for its toughness and strength in relatively large sections. 4340 VAR AMS 6414 is a low alloy Chromium-Nickel-Molybdenum steel capable of being heat treated to high strength levels. Pre hardened and tempered 4340 steels can be further surface hardened by flame or induction hardening and by nitriding. It is a steel of the highest quality with excellent transverse ductility and toughness at high strength levels. It has good shock and impact resistance as well as wear and abrasion resistance in the hardened condition. AISI 4340 steel properties offer good ductility in the annealed condition, allowing it to be bent or formed. Fusion and resistance welding is also possible with our 4340 alloy steel. ASTM 4340 material is often utilized where other alloy steels do not have the hardenability to give the strength required. For highly stressed parts it is excellent choice. AISI 4340 alloy steel can also be machined by all customary methods.

AISI 4340 Steel Specification and Relevant Standards

ASTM 4340 Steels And Equilvalents Chemical Composition