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20Mn2 Alloy Structural Steel

20Mn2 Alloy Structural Steel

Grade: 20Mn2 Steel
Type: steel plate/sheet, alloy structural steel, steel pipe
Standard: GB/T 3077
Specification: Thickness: 8mm—250mm ||||||Width:1500mm--4050mm ||||||Length: 3000mm to 15000mm
Application:20Mn2 steel is mainly used for making the carburized parts which don’t have high demand on surface and section size < 50 mm in diameter, such as carburized small gear, small axis, low requirements piston pins, cross pin head, diesel engine sleeve, valve plunger mandril, gearbox joystick, steel bushing, etc of automobiles, tractors and in machine tools production. In addition, in the hot rolling and normalizing state 20Mn2 steel can also be used for manufacturing rivet welding parts, screw and nut etc.

20Mn2 Alloy Structural Steel Introduction 

20Mn2 steel has medium strength. The coldstraining plasticity of 20Mn2 steel is high, low temperature property is good, weldability and machinability are passable. And compared with carbon steel with corresponding carbon content, the quench-hardening ability of 20Mn2 steel is higher. In oil the critical full hardening diameters are 4-15mm. But in heat treatment 20Mn2 steel has the tendency of overheating, decarburization sensitivity and temper brittleness. This kind of steel has an appropriate quench-hardening ability, after the suitable metal heat treatment, the microstructure of the body is the uniform sorbite ,bainite or superfine pearlite, thus it has the high tensile strength.
20Mn2 Alloy Structural Steel Delivery state
20Mn2 Steel Material should be delivered at hot-rolled or hot wrought conditions. Once the demander requires(and stipulates in the contract),hot processing condition(annealing, normalizing or high-temperature backfire) can also be adopted.
20Mn2 Alloy Structural Steel Application
20Mn2 steel is mainly used for making the carburized parts which don’t have high demand on surface and section size < 50 mm in diameter, such as carburized small gear, small axis, low requirements piston pins, cross pin head, diesel engine sleeve, valve plunger mandril, gearbox joystick, steel bushing, etc of automobiles, tractors and in machine tools production. In addition, in the hot rolling and normalizing state 20Mn2 steel can also be used for manufacturing rivet welding parts, screw and nut etc.
20Mn2 Alloy Structural Steel

20Mn2 Alloy Structural Steel Chemical Composition Analysis  

20Mn2 Chemical Composition
Grade The Element Max (%)
20Mn2 C Si Mn Cr
0.17-0.24 0.17-0.37 1.40-1.80 0.30

20Mn2 Alloy Structural Steel Mechanical Properties 


Tensile Strength(σb/MPa)
Yield point(σs/MPa) Elongation(δ5/%) Reduction of Area(ψ/%) Impact Absorbing Energy(Aku2/J) Brinell Hardness(HBS100/3000)
Annealing or High Tempering
≥785 ≥590 ≥10 ≥40 ≥47 ≤187

20Mn2 Alloy Structural Steel Packing

20Mn2 Steel Packing is normally wrapped by plastic film and waterproof paper, and then fastened on wooden pallet or as you request.

Stainless Steel Surface Finishes:

1. No 1 Finish : Used where Heat and corrsoion ressistance is required . Produced by annealing and resealing after hot rolling .

2. No 2D Finish : Dull Cold rolled finish . Used in deep drawn objects which are often polished after fabrication

3. NO 2 B Finish : Bright Cold Rolled Finish . Used in very deep drawn objects .

4. No 3 Finish : Polished finish obtained with abrasives

5. No 4 Finish : Used for kitchen ware , cooking utensils , restaurants and hotel kitchenware , cookware . Obtained with abrasives of 125 mesh and higher

6. NO 7 Finish : Architectural and Ornamental Finish

7. NO 8 Finish : Press plates , small mirrors and reflectors

8. Hairline finish : Ornamental plates , decorative items , name plates , elevators , doors in buildings

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