GB 40Cr Structural and constructional steels

Material group: Ferrous Alloys / Structural and constructional steels, Ferrous Alloys / Tool steels

Country/Standard: China / GB

Data updates

Latest Update: 2026-03

Total number of updates: 15

Update History

2025-10 2024-01 2022-09 2020-11 2020-06 2019-12 2019-03 2018-09 2018-06 2017-01 2016-09 2016-07 2016-05 2015-06

This material has 745 properties — only a subset is shown here.

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GB 40Cr Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

0.37 – 0.44

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

0.80 – 1.10

UNIT

CAS NUMBER

7440-47-3

CRITERIA

VALUE

≤ 0.30

UNIT

CAS NUMBER

7440-50-8

CRITERIA

VALUE

val1

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

GB/T 3077: 2015 / Alloy structure steels

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GB 40Cr Physical Properties

Temperature

0 - 30°C ≥ 300°C

PROPERTY / VALUE

Modulus of Elasticity

190 — 210 GPa

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Density

7.67 — 8 kg/dm³

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Poisson Coefficient

0.27 — 0.3

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This material has 745 properties — only a subset is shown here.

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GB 40Cr Heat Treatments

Quenched at 850 ± 15°C, water or oil quench.
Tempered at 520 ± 50°C, water or oil cooled
Full thread studs are tempered at min. 550°C.

GB 40Cr 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

550 — 1100 MPa

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Elongation, A

8 %

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Reduction of Area

val1 %

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Impact Energy

val1 J

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Brinell Hardness (HB)

176 — 340

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Rockwell Hardness (HR)

val1

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Grain Size

val1

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209 Cross References

82 Composition
146 Mechanical Properties
7 Physical Properties
7 Heat Treatment
81 Metallography
- Machinability

2 Stress-Strain
3 Formability
- Fatigue
- Fracture
32 Creep

- Joints
- Coatings
37 Dimensions
- Tribology

- Corrosion
- Ageing
- Weatherability
- Irradiation

139 Total Suppliers