40Cr Alloy Structural Steel Size Range

40Cr is the standard steel grade of China GB, and 40Cr steel is one of the most widely used steels in machinery manufacturing. After quenching and tempering treatment, 40Cr Alloy steel has good comprehensive mechanical properties, good low temperature impact toughness and low notch sensitivity. The steel is suitable for making medium plastic molds.

40Cr Steel Chemical Composition

C: 0.37~0.44
Si: 0.17~0.37
Mn: 0.50~0.80
Cr: 0.80~1.10
Ni: ≤0.30
P: ≤0.035
S: ≤0.035
Cu: ≤0.30
Mo: ≤0.10

Mechanical Property of 40Cr Structural Steel

Tensile strength (σb/MPa): ≥ 810 (when the actual hardness is 25HRC)
Yield point (σs/MPa): ≥785
Elongation after break (δ5/%): ≥9
Area shrinkage (ψ/%): ≥45
Impact absorption work (Aku2/J): ≥47
Brinell hardness (100/3000HBW) (annealed or high temperature tempered state): ≤ 207

40Cr Alloy Steel Features

40Cr steel belongs to medium carbon quenched and tempered steel, cold heading die steel. The steel is moderately priced and easy to process, and a certain degree of toughness, ductility and wear resistance can be obtained after proper heat treatment. Normalizing promotes the refinement of the structure and is close to equilibrium, which improves the cutting performance of the blank.