Detailed description

1.Characteristics and application:

 Good mechanical properties and processing properties, its quench-hardening ability is higher, to join the steel grain refinement of vanadium, reduce the sensitivity of overheating, improving the strength and toughness, high fatigue strength, and higher than the yield, but the weldability poor, cold plastic deformation due to the low. Is a kind of more senior spring, used as a large section of the high load important and working temperature < 300 spring °C valve spring, the pistons spring, the relief valve spring 2.Chemical ingredients:

 Carbon C: 0.47 ~ 0.55Si Si: more than 0.40Manganese Mn: 0.70 ~ 1.10Sulfur S: more than 0.030Phosphorus P: more than 0.030Chromium Cr: 0.90 ~ 1.20Ni Ni: more than 0.35Copper Cu: more than 0.25Vanadium V: 0.10 ~ 0.253.Mechanical properties:

Tensile strength σ b (MPa) : frequency 1274 (130)The yield strength σ s (MPa) : frequency 1127 (115)Elongation δ 5 (%) : 10 frequencyArea reduction ψ (%) : 40 frequencyHardness: hot rolling, than 321 HB; Cold pull + heat treatment, than 321 HB4.Heat treatment standard and metallographic organization:

 Heat treatment specification: quenching 850 °C ± 20 °C, oil cold; Tempering 500 °C ± 50 °C (special needs, 30 °C ±).5.Delivery status:

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

51CrV4(1.8159) special steel