Material Name: alloy steel grade: 25CrMo4 Standard: DIN
● Features and application: high hardenability, no temper brittleness, very good weldability, cold cracking tendency to form small, cutting and cold can be a good strain plasticity. General case hardening in quenched state or used for the manufacture of non-corrosive medium and temperature lower than 250 ℃, with
A mixture of nitrogen and hydrogen in the medium and high-pressure pipe work in a variety of fasteners, higher carburizing parts such as gears and shafts.
● Chemical Composition: C: 0.22 ~ 0.29 Si Si :0.10-0 .40 Mn Mn: 0.60 ~ 0.90 Sulfur S: to allow the residual phosphorus content ≤ 0.035 P: ≤ 0.035 to allow the residual content of chromium Cr: 0.90 ~ 1.20 Ni: to allow the residual content ≤ 0.030 copper Cu: to allow the residual content ≤ 0.030 Mo Mo: 0.15 ~ 0.30
● Mechanical Properties: Tensile strength σb (MPa): ≥ 885 (90) yield strength σs (MPa): ≥ 685 (70) Elongation δ5 (%): ≥ 12 Reduction of area ψ (%): ≥ 50 impact power Akv (J): ≥ 78 impact toughness αkv (J/cm2): ≥ 98 (10) hardness: ≤ 197HB sample size: Sample size is 15mm rough
● Heat treatment and microstructure specifications: standard heat treatment: quenching 880 ℃, water, oil cooling; tempering 500 ℃, water-cooled, oil-cooling.
