24 July 2021 Structural Steel Bar
40CrNiMo7 Structural Steel Bar
40CrNiMo7 structural steel with high strength, toughness and good hardenability and anti-overheating stability, but the white point of high sensitivity, temper brittleness. Weldability is poor, pre-heated by the need to preheat after welding to eliminate stress, after quenching and then use.
Chemical composition:
- Carbon C 0.37 ~ 0.44
- Silicon Si 0.17 ~ 0.37
- Manganese Mn0.50 ~ 0.80
- Sulfur allows the residual content ≤ 0.025
- Phosphorus P allows residual content ≤ 0.025
- Chromium Cr 0.60 ~ 0.90
- Nickel Ni 1.25 ~ 1.65
- Copper Cu allows residual content ≤ 0.25
- Molybdenum Mo 0.15 ~ 0.25
Mechanical properties:
- Tensile strength σb (MPa) ≥ 980 (100),
- Elongation δ5 (%) ≥12,
- Section shrinkage ψ (%) ≥ 55,
- Impact energy Akv (J) ≥25, impact toughness value αkv (J / cm2) ≥98 (10)
Main Application:
high-strength parts such as aero-engine shaft, shaft, gear, tight