40Cr Alloy steel round bar

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11-May-2024

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.

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

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.

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.

KUNFENG is a professional 40cr alloy round bar exporter and a steel round bar Stockist in China. Any need in 40cr alloy round bar Chemical Composition and Mechanical Properties, please feel free to contact us by email or calling to us!