SACM645 

 ● Features and Scope: SACM645 alloy structural steel with high surface hardness, wear resistance and fatigue strength, and has good heat resistance and corrosion resistance, hardenability is not high. SACM645 for the production of high wear resistance, high fatigue strength and considerable strength to deal with high dimensional accuracy after nitride parts, such as the imitation model, cylinder liner, gear, high pressure valves, boring bar, worm, grinding spindles. However, part of a larger size should not be used. 
 SACM645 alloy steel 
 ● Chemical Composition: C: 0.35 ~ 0.42 Si Si: 0.20 ~ 0.45 Manganese Mn: 0.30 ~ 0.60 S S: to allow the residual phosphorus content ≤ 0.035 P: ≤ 0.035 to allow the residual content of chromium Cr: 1.35 ~ 1.65 Ni: to allow the residual content ≤ 0.030 Copper Cu: Mo to allow the residual content ≤ 0.030 Mo: 0.15 ~ 0.25 ● Mechanical Properties: Tensile 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: the sample blank standard size 30mm ● Heat treatment and microstructure: heat treatment specifications: 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