Alloy structural steel: SCM435 performance standards: JIS G4053-2003 
 Outline 
 Feature 
 Have high static strength, impact toughness and high fatigue limit, hardenability than 40Cr high temperature under high creep strength and rupture strength, long-term working temperature up to 500 ℃; cold deformation, plastic medium, poor welding. 
 Use 
 Used in high load of the important structural components, such as vehicle and engine transmission parts; turbine rotor, spindle, heavy load shaft, a large cross-section parts 
 Physical properties 
 Chemical composition 
 Carbon C: 0.33 ~ 0.38 Si Si: 0.15 ~ 0.35 Manganese Mn: 0.60 ~ 0.90 S S: to allow the residual phosphorus content ≤ 0.030 P: ≤ 0.030 to allow the residual content of chromium Cr: 0.90 ~ 1.20 Ni: to allow the residual content of ≤ 0.25 Cu : to allow the residual content of ≤ 0.30 Mo Mo: 0.15 ~ 0.30 SCM435 SCM435 standard criteria: SCM435 is the Japanese standard (JIS G4053-2003) steel, domestic steel corresponding hardness 35CrMo SCM435 SCM435 hardness HRC36 ~ 43, HB269 ~ 341 
 Mechanical Properties 
 Tensile strength σb (MPa): ≥ 985 (100) yield strength σs (MPa): ≥ 835 (85) Elongation δ5 (%): ≥ 12 Reduction of ψ (%): ≥ 45 Impact energy Akv (J ): ≥ 63 impact toughness αkv (J/cm2): ≥ 78 (8) Hardness: ≤ 229HB sample size: Sample size of 25mm rough 
 Microstructure and heat treatment specifications 
 Standard heat treatment: quenching 850 ℃, oil-cooling; tempering 550 ℃, 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. Annealing annealing No.1 "760 ± 10 ℃ annealing, furnace cooling to 400 ℃ air-cooled. HB220-230 normalization normalize No.4 860 ± 10 ℃ normalizing, baked cooled. Quenched quenching + tempering No.5 840 ± 10 ℃ quenching water or oil (depending on the product shape complexity) ,680-700 degree tempered. HB <217 quenched and quenching + tempering No.6 840 ± 10 ℃ quenching oil, and then 470 degree tempered. HRC41-45 quenched quenching + tempering No.7 840 ± 10 ℃ quenching oil, and then 480 degree tempered. HRC35-45 quenched and quenching + tempering No.8 850 ℃ oil quenching, tempering and then 510 degrees. HRC38-42 quenching and quenching + tempering No.9 850 ℃ oil quenching, tempering and then 500 degrees. HRC40-43 quenched quenching + tempering No.10 850 ℃ quenching oil, and then 510 ℃ tempered. HRC36-42 quenched quenching + tempering No.11 quenching oil 850 ℃, 560 ℃ and then tempered. HRC32-36 quenched quenching + tempering No.12 860 ℃ oil quenching, tempering and then 390 degrees. HRC48-52