Products

40Cr – AISI5410 Alloy Structural Medium Carbon Quenched and Tempered Steel Plate

Technique Hot Rolled
Surface Treatment Black
Length 1000-12000mm
Width 1000mm-2000mm
Grade 40Cr
Thickness 1.2mm-400mm
Price Term CIF,CFR

40Cr steel is a kind of Chinese GB standard alloy steel for engineering and machinery purpose, and one of the most widely used steel grades. For 40Cr material hardness, specifications and equivalent, please see  the table below.

After quenching and tempering treatment, 40Cr steel has good comprehensive mechanical properties,low temperature impact toughness, low notch sensitivity, good hardenability, and high fatigue strength in cold oil. When water cooling, the complicated shape of the parts is prone to cracks, the cold bending plasticity is medium, and the cutting workability after normalizing is good, but the weldability is poor, should be preheated before welding, and is generally used in the state of quenching and tempering.

40Cr Steel Chemical Composition

 

Chemical Composition (%)

Grade

C

Si

Mn

Cr

40Cr

0.37 – 0.44

0.17 – 0.37

0.5 – 0.8

0.80 – 1.10

Mechanical Properties of 40Cr Alloy Steel

◎Tensile strength: ≥810 N/mm2 (When actual hardness 25 HRC)

◎Yield strength: ≥785 N/mm2

◎Elongation after break: ≥9%

◎Rate of reduction in area: ≥45%

◎Impact absorbing energy: ≥47 J

◎Material Brinell hardness: ≤207 (annealing or high temperature tempering state)

◎Sample size: 25mm

Characteristics: 

  1.        a) high purity good performance of high mirror polish, anti-acid, anti-rust after heat treatment
  2.        b) good corrosion resistance
  3.        c) resistance for erosive attack, good stability

1) Soft Annealing: Heat to 680oC – 720oC, cool slowly. This will produce a maximum Brinell hardness of 241. 

2) Hardening: Harden from a temperature of 820oC  – 850oC, 830oC – 860oC followed by water or oil quenching.

3) Tempering: Tempering temperature: 540oC – 680oC.

40Cr Steel Chemical Composition
 Chemical Composition (%)
GradeCSiMnCr
40Cr0.37 – 0.440.17 – 0.370.5 – 0.80.80 – 1.10

Characteristics: 

  1.        a) high purity good performance of high mirror polish, anti-acid, anti-rust after heat treatment
  2.        b) good corrosion resistance
  3.        c) resistance for erosive attack, good stability

1) Soft Annealing: Heat to 680oC – 720oC, cool slowly. This will produce a maximum Brinell hardness of 241. 

2) Hardening: Harden from a temperature of 820oC  – 850oC, 830oC – 860oC followed by water or oil quenching.

3) Tempering: Tempering temperature: 540oC – 680oC.