Have high surface hardness, wear resistance and fatigue strength, and has good heat resistance and corrosion resistance, hardenability is not high. For the production of high wear resistance, high fatigue strength and considerable strength to deal with high dimensional accuracy after nitride parts, such as imitation mode, cylinder liner, gear, high pressure valves, boring bar, worm, grinding spindles. However, part of a larger size should not be used.
Chemical composition:
Carbon C: 0.35 ~ 0.42
Si Si: 0.20 ~ 0.45
Manganese Mn: 0.30 ~ 0.60
Sulfur S: to allow the residual content of ≤ 0.035
Phosphorus P: allow the residual content ≤ 0.035
Chromium Cr: 1.35 ~ 1.65
Ni: to allow the residual content of ≤ 0.030
Copper Cu: to allow the residual content ≤ 0.030
Mo Mo: 0.15 ~ 0.25
Mechanical properties:
Tensile strength σb (MPa): ≥ 980 (100)
Yield strength σs (MPa): ≥ 835 (85)
Elongation δ5 (%): ≥ 14
Reduction of area ψ (%): ≥ 50
Impact energy Akv (J): ≥ 71
Impact toughness αkv (J/cm2): ≥ 88 (9)
Hardness: ≤ 229HB
Sample size: sample blank size of 30mm
Heat treatment and microstructure specifications:
Standard heat treatment: quenching 940 ℃, water, oil cooling; tempering 640 ℃, 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.
