English
English
Strength: 10 Material: carbon steel, alloy steel
Material: 40Cr
Material description: C 0.37-0.44, Mn0.50-0.80，Si0.17-0.37，Cr0.80-1.10，Cu≤0.30，Ni≤0.30，P≤0.035，S≤0.035， It is similar to American grade 5140, Japanese grade SCr440, German, British, and French 42Cr4, and ISO standard 41Cr4
Surface treatment: Blackening (quenching)
Surface treatment content: Blackening is a common method of metal heat treatment, which is to create a layer of oxide film on the metal surface to isolate air and achieve the purpose of rust prevention. When the appearance requirements are not high, blackening treatment can be used, and the surface of steel parts can be blackened, also known as bluing.
