40Cr alloy structural steel 40Cr 40Cr steel complete round 40Cr material specifications

40CR is the most common alloy structural steel, tensile strength, yield strength and hardenability than 40 steel high, but welding is limited, there is tendency to form cracks. More important for quenched and tempered parts, such as parts, medium speed and medium load of parts working under alternating load. After surface hardening and can be used for high load and wear resistance, without a great impact on the parts such as gears, sleeves, shafts, crankshafts, pin ● Chemical Composition: Carbon C: 0.37 ~ 0.44 Si Si: 0.17 ~ 0.37 Manganese Mn: 0.50 ~ 0.80 Sulfur S: to allow the residual phosphorus content ≤0.035 P: ≤0.035 allow the residual content Chromium Cr: 0.80 ~ 1.10 Ni: to allow the residual content ≤0.030 Copper Cu: to allow the residual content ≤0.030 ● Mechanical Properties: Tensile strength σb (MPa): ≥980 (100) yield strength σs (MPa): ≥785 (80) Elongation δ5 (%): ≥9 section shrinkage ψ (%): ≥45 impact energy Akv (J): ≥47 impact toughness αkv (J / cm2): ≥59 (6) Hardness: ≤207HB sample size: Sample size is 25mm ● Heat rough and microstructure specifications: Heat treatment specifications: quenching 850 ℃, oil cooling; return fire 520 ℃, water, oil cooling. ● Delivery status: to heat treatment (normalizing, annealing, or tempering) or without heat treatment delivery, the delivery status should be specified in the contract.