Good translation Metal Products (Shanghai) alloy structural steel companies (domestic alloy steel / alloy steel imports) 18cr2ni4w alloy structural steel / 18cr2ni4w steel / 18cr2ni4w steel bar / 18cr2ni4w Coil / 18cr2ni4w steel / 18cr2ni4w pipe / 18cr2ni4w wire (good Translation Metal Products (Shanghai) Co., Ltd.) 
 18Cr2Ni4W 
 18Cr2Ni4W Material Name: Alloy Steel 
 Grade: 18Cr2Ni4W 
 Standard: GB / T 3077-1988 
 18Cr2Ni4W a high intensity in the alloy 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. 
 18Cr2Ni4W common alloy steel hardened steel, strength, high toughness, good hardenability, but also without carburizing and quenching in the case of the use of larger cross-section is generally used as the load is high 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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