Stainless Steel 20mn

20Mn (also known as high-quality carbon structural steel), suitable for the manufacture of oil tanks. Cold area farm implements, such as cream cans.

Chinese name 20Mn

Use to make oil tanks

Standard GB/T 699-1988

Hardness not heat treated,≤197HB

Brief introduction of ingredients

Material name: High quality carbon structural steel

Brand: 20Mn

Characteristics and scope of application: high manganese and low carbon permeable steel, similar to 15Mn steel. Low carbon carburized steel with high manganese content (W mn 0.70%-1.00%), its strength is due to high manganese. Ductility. Machinability and hardenability are slightly higher than 15 steel, carburizing and quenching surface formation of soft points less, should be carburized. Carbonitriding treatment, the surface wear resistance and good toughness of the heart comprehensive performance. Good toughness after hot rolling or normalizing treatment. Suitable for gear, crank shaft, bracket, hinge, screw, nut, riveted welding structure, manufacturing oil tank, etc. Cold area farm implements, such as cream cans.

Chemical composition

Carbon C: 0.17 ~ 0.24

Silicon Si: 0.17 ~ 0.37

Manganese Mn: 0.70 ~ 1.00

Sulfur S: ≤0.035 P: ≤0.035

Chromium Cr: ≤0.25

Nickel Ni: ≤0.25

Copper Cu: ≤0.25

Mechanical property

Tensile strength σb (MPa) : ≥450(46)

Yield strength σs (MPa) : ≥275(28)

Elongation δ5 (%) : ≥24

Section shrinkage (%) : ≥50

Sample size: 25mm

Heat treatment specification and metallographic structure:

Heat treatment specification: Normalizing,910℃.

Distinction

The difference between 20Mn and 20Mn2: The chemical composition of these two kinds of steel (the same carbon content, different manganese content), mechanical properties, heat treatment methods are different, the main differences are as follows: 20Mn- is a high-quality carbon structural steel chemical composition (%) : C: 0.17~0.23Si: 0.17~0.37Mn: 0.7~1.00Cr≤ 0.25Ni≤ 0.30Cu≤0.25 Mechanical properties: Tensile strength ≥450MPa Yield limit ≥275MPa elongation ≥24% section shrinkage ≥50% Heat treatment: Normalizing, carbonizing, nitriding 20Mn2- alloy structural steel Chemical composition (%) : C: 0.17~0.24Si: 0.17~0.37Mn:1.40~1.80 Mechanical properties: Tensile strength ≥785MPa Yield limit ≥590MPa Elongation ≥10% section shrinkage ≥40% impact absorption work ≥47Aku2/J Heat treatment: quenching (water, oil quenching), tempering (water, air cooling), carburizing

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