Quality carbon structural steel 20Mn-65Mn

Quality carbon structural steel 20Mn-65Mn

Product Name : High quality carbon structural steel

Grade : 20Mn-65Mn

Specifications : Thick T: 1.5 ~ 24 W W :800-1100 length L: C

Standard : GB/T711-2008

Product Scope:

High strength, overall performance, good weldability and low temperature impact toughness , for the manufacture of steam turbines , compressors, pumps the moving parts ; also replace infiltration steel gears, shafts, piston pins and other parts.

Chemical composition:

Carbon C: 0.17 ~ 0.24

Si Si: 0.17 ~ 0.37

Manganese Mn: 0.70 ~ 1.00

Sulfur S: ≤ 0.035

Phosphorus P: ≤ 0.035

Chromium Cr: ≤ 0.25

Ni- Ni: ≤ 0.25

Copper Cu: ≤ 0.25

Mechanical properties :

Tensile strength σb (MPa): ≥ 450 (46)

Yield strength σs (MPa): ≥ 275 (28)

Elongation δ5 (%): ≥ 24

Reduction of ψ (%): ≥ 50

Hardness: no heat treatment , ≤ 197HB

Sample size : Sample size is 25mm

Heat treatment and microstructure specifications :

Heat treatment specifications: normalizing , 910 ℃.

Difference:

20Mn 20Mn2 with distinction : the chemical composition of these two steels ( same carbon content, manganese content ) , mechanical properties , heat treatment has a different main differences are as follows : 20Mn- quality carbon structural steel is a 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 strength ≥ 275MPa elongation ≥ 24% Reduction of ≥ 50% Heat treatment: normalizing , carbon, nitrogen permeation 20Mn2- alloy steel chemical composition (%): C: 0.17 ~ 0.24Si: 0.17 ~ 0.37Mn: 1.40 ~ 1.80 mechanical properties: tensile strength ≥ 785MPa yield strength ≥ 590MPa elongation rate of ≥ 10% ≥ 40% Reduction of impact energy ≥ 47Aku2 / J heat treatment : quenching ( water, oil quenching ) , tempering ( water , air ) , carburizing .