GB 40CrNiMo 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: 7

Update History

2025-10 2020-04 2020-02 2019-03 2017-01 2016-07

This material has 497 properties — only a subset is shown here.

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GB 40CrNiMo Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

0.37 – 0.44

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

0.60 – 0.90

UNIT

CAS NUMBER

7440-47-3

CRITERIA

VALUE

0.50 – 0.80

UNIT

CAS NUMBER

7439-96-5

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7439-98-7

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-02-0

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7723-14-0

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7704-34-9

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7440-21-3

JB/T 6396: 2006 / Specification for the heavy alloy structural steel forgings

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GB 40CrNiMo Physical Properties

Temperature

0 - 30°C

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 497 properties — only a subset is shown here.

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GB 40CrNiMo Heat Treatments

Hardening: heating at 850°C, cooling in oil; Tempering at 600°C, cooling in water or oil.
Quenching (840-860°C); Tempering (540-630°C)

GB 40CrNiMo Mechanical Properties

Temperature

≤ 0°C 0 - 30°C 30 - 100°C 100 - 300°C ≥ 300°C

PROPERTY / VALUE

Yield Strength, Rp0.2

val1 MPa

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Tensile Strength

685 — 1130 MPa

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Elongation, A

9 %

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Reduction of Area

val1 %

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Impact Energy

val1 J

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Brinell Hardness (HB)

207 — 341

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Grain Size

val1

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190 Cross References

34 Composition
96 Mechanical Properties
3 Physical Properties
3 Heat Treatment
2 Metallography
- Machinability

- Stress-Strain
- Formability
- Fatigue
- Fracture
7 Creep

- Joints
- Coatings
25 Dimensions
- Tribology

- Corrosion
- Ageing
- Weatherability
- Irradiation

137 Total Suppliers