Good translation Metal Products (Shanghai) alloy structural steel companies (domestic alloy steel / alloy steel imports) 18cr2ni4wa alloy structural steel / 18cr2ni4wa steel / 18cr2ni4wa steel bar / 18cr2ni4wa Coil / 18cr2ni4wa steel / 18cr2ni4wa pipe / 18cr2ni4wa wire (good Translation Metal Products (Shanghai) Co., Ltd.) 
 18Cr2Ni4WA 
 Material Name: Alloy Steel 
 Grade: 18Cr2Ni4WA 
 Standard: GB / T 3077-1988 
 In a high-strength alloy 18Cr2Ni4WA carburizing steel. To make C compounds and austenite can be used without excessive temperature after carburizing carburizing tempering 900 ~ 920 ℃, 600 ~ 650 tempering, cryogenic treatment, oil quenched hardness is 48 or so, you want to reach HRC58- 63, must be carried out surface carburization. 
 Case-hardened steel alloy steel used 18Cr2Ni4WA, strength, high toughness, good hardenability, but also without carburizing and quenching of the circumstances under which, generally used for large cross-section, high load and good toughness, low notch sensitivity the important parts. 
 ● Chemical Composition: 
 Carbon C: 0.13 ~ 0.19 
 Si Si: 0.17 ~ 0.37 
 Manganese Mn: 0.30 ~ 0.60 
 Sulfur S: allow the residual content ≤ 0.025 
 Phosphorus P: allow the residual content ≤ 0.025 
 Chromium Cr: 1.35 ~ 1.65 
 Ni-Ni: 4.00 ~ 4.50 
 Copper Cu: allow the residual content ≤ 0.025 
 Tungsten W: 0.80 ~ 1.20 
 ● Mechanical Properties: 
 Tensile strength σb (MPa): ≥ 1175 (120) 
 Yield strength σs (MPa): ≥ 835 (85) 
 Elongation δ5 (%): ≥ 10 
 Reduction of area ψ (%): ≥ 45 
 Impact energy Akv (J): ≥ 78 
 Impact toughness αkv (J/cm2): ≥ 98 (10) 
 Hardness: ≤ 269HB 
 Sample size: Sample size is 15mm rough 
 ● Heat treatment and microstructure specifications: 
 Standard heat treatment: quenching: the first 950 ℃, the second 850 ℃, air-cooled; 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. 
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