20CrV Material Name: Alloy structural steel 
 Grade: 20CrV Standard: GB / T 3077-1988 
 ● Features and Scope: 20CrV strength and toughness were higher than 20Cr steel after quenching a high surface hardness, toughness, hardenability is low. 20CrV requirements for high hardness and wear-resistant surface, the center of a greater intensity of the cross-section without a large carburized parts such as gears, piston pin, a small shaft, distribution shaft, plunger, valve and steam turbine on putting in 300 ~ 500 ℃ work under heat nuts and washers, non-corrosive media, high-pressure pipelines work. 
 20CrV alloy steel 
 ● Chemical Composition: C: 0.17 ~ 0.23 Si Si: 0.17 ~ 0.37 Manganese Mn: 0.50 ~ 0.80 S S: to allow the residual phosphorus content ≤ 0.035 P: ≤ 0.035 to allow the residual content of chromium Cr: 0.80 ~ 1.10 Ni: to allow the residual content ≤ 0.030 Copper Cu: ≤ 0.030 to allow the residual content of vanadium V: 0.10 ~ 0.20 ● Mechanical Properties: Tensile σb (MPa): ≥ 835 (85) yield strength σs (MPa): ≥ 590 (60) Elongation δ5 ( %): ≥ 12 Reduction of area ψ (%): ≥ 45 Impact energy Akv (J): ≥ 55 impact toughness αkv (J/cm2): ≥ 69 (7) Hardness: ≤ 197HB sample size: the sample blank standard size 15mm ● Heat treatment and microstructure: heat treatment specifications: quenching: the first 880 ℃, the second 800 ℃, water, oil cooling; tempering 200 ℃, water, air-cooled. ● Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract