Detailed description

 A detailed description"Characteristics and application:"Chemical ingredients:"Mechanical properties:"Heat treatment standard and metallographic organization: 1.Characteristics and application:

 The static strength, have very high impact toughness and higher fatigue limit, its quench-hardening ability is 40 Cr high, high temperatures high creep strength and sustained intensity, long work temperatures up to 500 °C; Cold when the deformation plasticity medium, welding sex differences. Used for high load in the important parts, such as vehicle and the engine driving a; The steam turbine generator rotor, spindle, heavy load of the drive shaft, large sections parts2.Chemical ingredients:

Carbon C: 0.30 ~ 0.37Si 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 985 (100)The yield strength σ s (MPa) : frequency 835 (85)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 229 HBSample size: sample blank dimensions for 25 mm4.Heat treatment standard and metallographic organization:

 Heat treatment specification: quenching 850 °C, the oil cold; Tempering 550 °C, water, oil, and cold.  

34CrMo4(1.7220) special steel