|Chemical Composition (%)|
|Yield strength σs/MPa (>=)||Tensile strength σb/MPa (>=)||Elongation
area ψ/% (>=)
|Impact absorbing energy Aku2/J (>=)||Hardness HBS
Equivalent Of 20Cr alloy Structure Steel
|5120 / G51200||20Cr4 / 1.7027||20Cr||SCr420||18C3||527A20||20Cr4|
Heat treatment Related
Slowly heated to 850 ℃ and allow enough times, let the steel to be thoroughly heated, Then cool slowly in the furnace. The 20Cr alloy steel will get MAX 250 HB （Brinell hardness）.
First quenching heated slowly to 880°C, Then after adequate soaking at this temperature quench in oil or water. Temper as soon as tools reach room temperature. Second quenching heat to 780-820°C， then quenching in oil or water.
Heat to 20°C, then cool in water or oil.normal delivery hardness 179HB Min.
GB 20Cr steel is widely used for a variety of applications in the used in the automotive and engineering industries for toolholders and other such components. Mostly used in the manufacture of the demand is higher, intensity of heart surface wear, under section under 30 mm or small carburized parts of complex shape and load (oil quenching), such as: transmission gear, gear shaft, CAM, worm, piston pin, claw clutch, etc.; For the heat treatment deformation and high abrasion resistance parts, should be high frequency surface quenching after carburizing, such as modulus is less than 3 of the gear, shaft, spline shaft, etc. This steel can be used in the quenched and tempered state and used in the manufacture of large and medium under impact load in her work parts, this kind of steel also can be used as a low carbon martensite steel quenching, further increasing steel yield strength and tensile strength increased (about 1.5 ~ 1.7 times). Typical applications such as valve bodies, pumps and fittings, Shaft, the high load of wheel, bolts, double-headed bolts, gears, etc
Regular size and Tolerance
Steel round bar: Diameter Ø 5mm – 3000mm
Steel plate: Thickness 5mm – 3000mm x Width 100mm – 3500mm
Steel Hexagonal bar: Hex 5mm – 105mm
Others 20Cr have not specified size, pls contact our experienced sales team.
GB 20Cr alloy steel round bar and flat sections can be cut to your required sizes. 20Cr alloy steel ground bar can also be supplied, providing a high quality tool steel precision ground tool steel bar to your required tolerances. GB 20Cr steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes.