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Alloy steel-4340

Equivalent grades GB DIN AISI JIS  
40CrNiMoA 1.6582  4340 SNCM8  
Chemical Composition C Si Mn Cr  Mo Ni P S  
0.38-0.43 0.15-0.35 0.60-0.80 0.70-0.9 0.20-0.30 1.65-2.00 0.03max 0.03max  
Available size Round Bar Diameter Length
70-600mm 2000-6000mm
Flat Bar Thickness Width Length
25-400mm 200-800mm 2000-6000mm
Surface condition Black surface/ Grinded/ Machined
Annealed hardness HBS≤248
Characteristics special alloy steel, supplied in quenched and tempered conditions. High strength and tenacity, good hardenability.
Applications heavily loaded parts for mechanical engineering and motor construction. 
Heat Treatment Forging Heat to 1150℃ Hold till uniform.Minimum forging temperature 850℃。Cool slowly in ashes or sand etc.
Annealing Heat to 830℃-850℃。Cool infurnace.
Stress Relieving Annealed: Heat to 600℃-650℃。Hardened: Heat to 500℃-550℃。Cool in still air.
Hardening Heat to 830℃-880℃。Quench in oil or polymer.
Tempering Heat to 450℃-660℃ cool in still air NB. Tempering within the range 250℃-450℃ will result in temper brittleness and should be avoided.

Alloy steel-4340
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