20Cr (China / GB) Material Properties

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

Data updates

Latest Update: 2022-09
Total number of updates: 8
Update History:
2019-12 2019-03 2018-09 2018-06 2017-01 2016-07 2015-06

Mechanical Properties

Temperature

0 - 30°C
PROPERTY / VALUE
Yield Strength, Rp0.2 val1
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MPa view details
Tensile Strength 400 — 650 MPa view details
Elongation, A 10 % 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) 123 — 229 view details
Yield Strength, Rp0.2 val1
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ksi view details
Tensile Strength 58 — 94.3 ksi view details
Elongation, A 10 % 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) 123 — 229 view details

Physical Properties

Temperature

0 - 30°C
≥ 300°C
PROPERTY / VALUE
Modulus of Elasticity 190 — 210 GPa view details
Density 7.67 — 7.86 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 — 0.284 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
0.18 – 0.24
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
0.70 – 1.00
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

  • Double quenching: at 880°C, cooling in water or oil and at 780-820°C, cooling in water or oil; Tempering at 200°C, cooling in water or air.
  • Heated at 880°C; water or oil quenched; re-heated at 800°C; Austempered in the range 280-320°C; Tempered at 200°C; water quenched or cooling in air.