20Mn5 alloy structural steel

Implementation of the standards: EN 10028/2-2003

   ● Features and application: 20Mn5 (1.0473) alloy structural steel with a moderate-intensity, cold plastic deformation of high and low temperature performance, and the corresponding carbon content of steel compared to the high hardenability. 20Mn5 (1.0473) is generally used as a small cross-section parts, and 20Cr steel equivalent, can be used for carburized pinion, small axes, steel sleeve, piston pin, engine bushing, steering wheel shaft, valve push rod, etc.; also quenched and tempered steel can be used, such as cold heading bolt or larger cross-section of the quenched parts.

20Mn5 (1.0473) alloy structural steel
      ● Chemical Composition:

     Carbon C: 0.10 ~ 0.22

Si Si: 0.17 ~ 0.37

Manganese Mn: 1.10 ~ 1.70

  Sulfur S: to allow the residual content of ≤ 0.35

  Phosphorus P: allow the residual content of ≤ 0.35

Chromium Cr: allow the residual content of ≤ 0.30

  Ni: to allow the residual content of ≤ 0.30

Copper Cu: to allow the residual content of ≤ 0.30

● Mechanical Properties:

Tensile strength σb (MPa): ≥ 785 (80)

  Yield strength σs (MPa): ≥ 590 (60)

  Elongation δ5 (%): ≥ 10

Reduction of area ψ (%): ≥ 40

Impact energy Akv (J): ≥ 47

   Impact toughness αkv (J/cm2): ≥ 59 (6)

  Hardness: ≤ 187HB

Sample size: Sample size is 15mm rough

● Heat treatment and microstructure specifications:

Heat treatment specifications: 1) quenching 850 ℃, water, oil cooling; tempering, 200 ℃, water, air-cooled. 2) quenching 880 ℃, water, oil cooling, 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.