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 ℃, the medium containing a mixture of nitrogen and hydrogen in high pressure pipe work and a variety of fasteners, higher carburizing parts such as gears and shafts.
● Chemical Composition:
  Carbon 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 of ≤ 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 energy 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.
● Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract.