GB 45 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: 24

Update History

2025-10 2025-07 2025-01 2023-02 2022-08 2022-07 2022-04 2021-12 2021-05 2021-04 2021-01 2020-05 2020-04 2020-02 2018-07 2018-06 2017-09 2017-01 2016-12 2016-05 2015-08 2014-10 2014-05

This material has 1740 properties — only a subset is shown here.

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GB 45 Chemical Composition

CRITERIA

VALUE

UNIT

CAS NUMBER

CRITERIA

VALUE

0.42 – 0.50

UNIT

CAS NUMBER

7440-44-0

CRITERIA

VALUE

≤ 0.25

UNIT

CAS NUMBER

7440-47-3

CRITERIA

VALUE

≤ 0.25

UNIT

CAS NUMBER

7440-50-8

CRITERIA

VALUE

val1

UNIT

CAS NUMBER

7439-96-5

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 699: 2015 / Quality carbon structure steels

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GB 45 Physical Properties

Temperature

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

PROPERTY / VALUE

Modulus of Elasticity

190 — 210 GPa

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Density

val1 kg/dm³

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Poisson Coefficient

val1

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Electrical Resistivity

0.132 Ω∙mm²/m

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Electrical Conductivity

val1 S/m

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Service Temperature

val1 °C

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This material has 1740 properties — only a subset is shown here.

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GB 45 Heat Treatments

Normalized at 850 ± 30°C, air cooled;
Quenched and tempered: Heated at 840 ± 15°C water or oil quenched, and tempered at 600 ± 50°C water or oil cooled
Normalizing at 850°C; Quenching at 840°C; Tempering at 600°C.

GB 45 Mechanical Properties

Temperature

≤ 0°C 0 - 30°C

PROPERTY / VALUE

Yield Strength, Rp0.2

val1 MPa

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Tensile Strength

400 — 1030 MPa

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Elongation, A

4 %

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Reduction of Area

val1 %

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Impact Strength

val1 kJ/m²

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Impact Energy

val1 J

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Brinell Hardness (HB)

156 — 302

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Rockwell Hardness (HR)

val1

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Vickers Hardness (HV)

val1

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Grain Size

val1

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637 Cross References

131 Composition
291 Mechanical Properties
44 Physical Properties
5 Heat Treatment
103 Metallography
- Machinability

45 Stress-Strain
2 Formability
8 Fatigue
- Fracture
- Creep

- Joints
- Coatings
28 Dimensions
- Tribology

- Corrosion
- Ageing
- Weatherability
- Irradiation

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