40Cr (China / GB) Material Properties

Other designations:
Material group: Ferrous Alloys / Structural and constructional steels, Ferrous Alloys / Tool steels
Country/Standard: China / GB

Data updates

Latest Update: 2024-01
Total number of updates: 13
Update History:
2022-09 2020-11 2020-06 2019-12 2019-03 2018-09 2018-06 2017-01 2016-09 2016-07 2016-05 2015-06

Mechanical Properties

Temperature

0 - 30°C
30 - 100°C
100 - 300°C
≥ 300°C
PROPERTY / VALUE
Yield Strength, Rp0.2 val1
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MPa view details
Yield Strength, Rp0.2 val1
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MPa view details
Yield Strength, Rp0.2 val1
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MPa view details
Yield Strength, Rp0.2 val1
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MPa view details
Tensile Strength 550 — 1100 MPa view details
Elongation, A 8 % view details
Reduction of Area val1
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% view details
Impact Energy val1
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J view details
Brinell Hardness (HB) 176 — 300 view details
Rockwell Hardness (HR) val1
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view details
Yield Strength, Rp0.2 val1
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ksi view details
Yield Strength, Rp0.2 val1
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ksi view details
Yield Strength, Rp0.2 val1
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ksi view details
Yield Strength, Rp0.2 val1
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ksi view details
Tensile Strength 79.8 — 159.5 ksi view details
Elongation, A 8 % view details
Reduction of Area val1
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% view details
Impact Energy val1
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ft·lb view details
Brinell Hardness (HB) 176 — 300 view details
Rockwell Hardness (HR) val1
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view details

Physical Properties

Temperature

0 - 30°C
≥ 300°C
PROPERTY / VALUE
Modulus of Elasticity 190 — 210 GPa view details
Density 7.67 — 8 kg/dm³ view details
Poisson Coefficient 0.27 — 0.3 view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°C view details
Modulus of Elasticity 27.6 E+03 — 30.5 E+03 ksi view details
Density 0.277 — 0.289 lb/in³ view details
Poisson Coefficient 0.27 — 0.3 view details
Coefficient of Thermal Expansion (CTE) val1
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10-6/°F view details

Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
0.37 – 0.44
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
0.80 – 1.10
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Cu
VALUE
≤ 0.30
UNIT
%
CAS NUMBER
7440-50-8
CRITERIA
Mn
VALUE
val1
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UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
Mo
VALUE
val1
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UNIT
%
CAS NUMBER
7439-98-7
CRITERIA
Ni
VALUE
val1
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UNIT
%
CAS NUMBER
7440-02-0
CRITERIA
P
VALUE
val1
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UNIT
%
CAS NUMBER
7723-14-0
CRITERIA
S
VALUE
val1
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UNIT
%
CAS NUMBER
7704-34-9
CRITERIA
Si
VALUE
val1
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UNIT
%
CAS NUMBER
7440-21-3

GB/T 3077: 2015 / Alloy structure steels

Heat Treatments

  • <b>Quenched </b>at 850 ± 15°C, cooled in oil. <br> <b> Tempered </b> at 520 ± 50°C, cooled in water, oil
  • Full thread studs are tempered at min. 550°C.