40Cr Steel Round Bar Hot Rolled Alloy Bar OD 260mm 40Cr Material ASTM 5140 Steel Material Properties
40cr alloy round bar is widely used in the manufacture quenched withstand moderate work load and medium speed mechanical parts , such as automotive steering knuckles, and rear axle gear on the machine shaft , worm , spline shaft , top covers. More informational about 40cr alloy round bar details, please see the following:
40cr alloy round bar details:
Name: 40cr alloy steel
Standard: GB / T 3077-1999
Quenched specifications : quenching temperature 850 ℃ ± 10 ℃, oil cooling ; tempering temperature 520 ℃ ± 10 ℃, water, oil, air cooling.
40cr alloy steel round bar chemical composition (mass fraction,%)
| C | Si | Mn | Cr | Ni |
| 0.37~0.44 | 0.17~0.37 | 0.50~0.80 | 0.80~1.10 | ≤0.30 |
40cr alloy steel round bar mechanical properties:
Blank sample size (mm): 25 Heat treatment : the first quenching temperature (℃): 850; Coolant: Oil
The second quenching temperature (℃):
Tempering heating temperature (℃): 520; Coolant: water, oil tensile strength (σb / MPa): ≧ 980
Yield point (σs / MPa): ≧ 785 Elongation (δ5 /%): ≧ 9
Section shrinkage (ψ /%): ≧ 45 impact energy (Aku2 / J): ≧ 47
Normalizing specifications : Temperature 850 ~ 870 ℃ the hardness of 179 ~ 229HBS.
40cr round bar features: modulation of carbon steel , cold heading die steel. The steel affordable, easily processed, after appropriate heat treatment can be obtained by a certain toughness , ductility and wear resistance. Normalizing can promote tissue ball , improved cutting hardness of less than 160HBS blank . Tempering temperature 550 ~ 570 ℃, the steel has the best mechanical properties. The steel hardenability than 45 steel , suitable for induction hardening , flame quenching surface hardening treatment.
40cr alloy steel round bar usage: After the steel used in the manufacture quenched withstand moderate work load and medium speed mechanical parts , such as automotive steering knuckles, and rear axle gear on the machine shaft , worm , spline shaft , top covers.
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