GB 20CrMnMo Structural and constructional steels

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

Data updates

Latest Update: 2026-03
Total number of updates: 4
Update History
2017-01 2016-07 2016-05

This material has 783 properties — only a subset is shown here.

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GB 20CrMnMo Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
0.17 – 0.23
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
1.10 – 1.40
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

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GB 20CrMnMo Physical Properties

Temperature

PROPERTY / VALUE
Modulus of Elasticity
190 — 210 GPa
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Density
7.67 — 7.86 kg/dm³
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Poisson Coefficient
0.27 — 0.3
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This material has 783 properties — only a subset is shown here.

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GB 20CrMnMo Heat Treatments

  • Hardening: heating at 850°C, cooling in oil; Tempering at 200°C, cooling in water or air.
  • Recommended heat treatment: Quenched at 850 ± 15°C, tempered at 200 ± 20°C

GB 20CrMnMo Mechanical Properties

Temperature

PROPERTY / VALUE
Yield Strength, Rp0.2
val1
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MPa
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Tensile Strength
490 — 740 MPa
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Elongation, A
7 %
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Reduction of Area
val1
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%
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Impact Energy
val1
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J
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Brinell Hardness (HB)
217
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Grain Size
val1
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  • 39 Composition
  • 37 Mechanical Properties
  • 3 Physical Properties
  • 2 Heat Treatment
  • 4 Metallography
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