20Cr hot rolled steel sheet
20Cr hot rolled steel sheet
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- Commodity name: 20Cr hot rolled steel sheet
GB 20Cr alloy Steel is a high quality Quenched and Tempered Alloy Structural steel. GB 20Cr Alloy steel, we can supply the round bar, steel flat bar, plate, hexagonal steel bar and steel square block. GB 20Cr steel Round bar can be sawn to your required lengths as one offs or multiple cut pieces.
Product introduction
GB 20Cr alloy Steel is a high quality Quenched and Tempered Alloy Structural steel, It belong to the high quality low carbon,Low alloy chromium, molybdenum, nickel case hardening steel. Oil Quenched & Tempered Hardness is 28-34 HRc. GB 20Cr steel Annealing delivery hardenss less than 250HB.20Cr With a lower carbon content range, So GB 20Cr alloy steel have good weldability.
GB 20Cr alloy steel equivalent specification: ASTM A29/A29M, DIN EN 10083/3, JIS G4053 and GB/T 3077. GB 20Cr equivalent steel round bar and flat bars can be cut to your required sizes. China steel 20Cr hot rolled and forged steel bar can also be supplied, providing a high quality tool steel precision ground tool steel bar to your required tolerances. GB 20Cr steel equivalent material bars are supplied in round, square and flat shapes.
GB 20Cr alloy Steel is a high quality Quenched and Tempered Alloy Structural steel. It belongs to the high quality low carbon,Low alloy chromium, molybdenum, nickel case hardening steel. Oil Quenched & Tempered GB 20Cr Steel Hardness is 28-34 HRc. GB 20Cr steel Annealing delivery hardenss less than 250HB. With a lower carbon content range, GB 20Cr alloy steel equivalents have good weldability.
GB 20Cr forged steel bar and hot rolled steel bar 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
Compared with 15Cr steel, it has higher strength and hardenability. The critical hardening diameter in oil reaches 4-22mm, and the critical hardening diameter in water reaches 11-40mm, but its toughness is poor. There is a tendency for grains to grow, and direct quenching at cooling has a greater impact on impact toughness. Therefore, after carburizing, secondary quenching is required to improve the toughness of the part core without temper brittleness; steel has high cold strain plasticity and can be drawn in cold conditions. ; Machinability is good under high temperature normalizing or quenching and tempering state, but poor after annealing; 20Cr is pearlite, with good weldability, generally does not need heat treatment after welding, but parts with a thickness greater than 15mm need to be preheated before welding When it reaches 100～150℃, tempering heat treatment is not required after welding.Technical data
20Cr hot rolled steel sheet Chemical Composition
Chemical Composition (%) Steel Grade C Si Mn P S Cr Ni Cu 20Cr 0.18～0.24 0.17～0.37 0.50～0.80 ≤0.035 ≤0.035 0.70～1.00 ≤0.030 ≤0.30
Mechanical properties
Yield strength σs/MPa (>=) Tensile strength σb/MPa (>=) Elongation
δ5/% (>=)Reduction of
area ψ/% (>=)Impact absorbing energy Aku2/J (>=) Hardness HBS
100/3000 max≧540 ≧835 ≧10 ≧40 ≧47 ≦179 Equivalent Of 20Cr alloy Structure Steel
USA Germany China Japan France England Italy Poland ISO Austria Sweden Spain ASTM/AISI/UNS/SAE DIN,WNr GB JIS AFNOR BS UNI PN ISO ONORM SS UNE 5120 / G51200 20Cr4 / 1.7027 20Cr SCr420 18C3 527A20 20Cr4 Heat treatment Related
- Annealing of 20Cr Alloy structural steel
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）.
- Hardening of GB Alloy structural steel 20Cr
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.
- Tempering of 20Cr Alloy structural steel
Heat to 20°C, then cool in water or oil.normal delivery hardness 179HB Min.
Applications
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.
Processing
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.
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Tianjin Bohai Metal
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