Detailed description

1.Characteristics and application:

Its quench-hardening ability, high strength, toughness, and hardened little deformation, the high temperature is high creep strength and enduring strength. Used for manufacturing requirements is 35 CrMo steel strength higher and conditioning section more forgings, such as the locomotive traction in the big gear, gear, rear axle, supercharger load great rods and a spring clips, also can be used for 2000 m below oil deep well drilling pipe joint and fishing tools, etc.

2.Chemical ingredients:

 Carbon C: 0.38 ~ 0.45Si Si: more than 0.40Manganese Mn: 0.60 ~ 0.90Sulfur S: allow residual content than 0.035Phosphorus P: allow residual content than 0.035Chromium Cr: 0.90 ~ 1.20Ni Ni: allow residual content than 0.030Copper Cu: allow residual content than 0.030Mo Mo: 0.15 ~ 0.30

3.Mechanical properties:

Tensile strength σ b (MPa) : frequency 1080 (110)The yield strength σ s (MPa) : frequency 930 (95)Elongation δ 5 (%) : 12 frequencyArea reduction ψ (%) : 45 frequencyImpact energy Akv (J) : 63 frequencyImpact toughness values α kv (J/cm2) : frequency 78 (8)Hardness: more than 217 HBSample size: sample blank dimensions for 25 mm4.Heat treatment standard and metallographic organization:

Heat treatment specification: quenching 850 °C, the oil cold; Tempering 560 °C, water, oil, and cold.5.Delivery status:

the hot rolling steel heat treatment or not heat treatment with state delivery, cold pull steel heat treatment with state delivery.

42CrMo4(1.7225) special steel