Description:
It belongs to the national standard alloy structural steel and is the most commonly used alloy quenched and tempered structural steel.
( Corresponding to German DIN standard steel number 41Cr4/42Gr4;Swedish SS standard steel number 2245;American AISI/SAE/ASTM standard steel number 5140;Japanese JIS standard steel number SCr440(H)/SCr440 )
Chemical composition content :
C:0.37-0.44 Si:0.17-0.37 Mn:0.50-0.80 S:≤0.030 P:≤0.030 Cr:0.80-1.10 Ni:≤0.30