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Engineering Structural Steel Material Standard GB/T 11352-1989

This is a China standard for the chemical analysis and mechanical properties of engineering structural steel. It has higher strength, mechanical properties, shock resistance and corrosion resistance. Engineering structural steel is mainly used to manufacture a wide range of engineering structures, such as the bridge, hull, steel rail, high-pressure vessel and construction steel structure, and so on.

The following is the main content of GB/T 11352-1989 standard for your reference.

The steel number and chemical analysis of engineering structural steel (mass fraction) (%) 

Steel number

Steel number
of the old type

C

Si

Mn

P

S

Residual element (≤)

ZG200-400

ZG15

<=0.20

<=0.50

<=0.80

0.040

0.040

Cr<=0.35
Ni<=0.30
Mo<=0.20
Cu<=0.30
V<=0.05

ZG230-450

ZG25

<=0.30

<=0.50

<=0.90

0.040

0.040

ZG270-500

ZG35

<=0.40

<=0.50

<=0.90

0.040

0.040

ZG310-570

ZG45

<=0.50

<=0.60

<=0.90

0.040

0.040

ZG340-640

ZG55

<=0.60

<=0.60

<=0.90

0.040

0.040

 The mechanical properties of engineering structural steel 

Steel number

Heat treatment

Mechanical properties (no less than)

Normalization or anneal temperature
/ ℃

Tempering
temperature
/ ℃

σ
/MPa

σ
/MPa

δ
(%)

ψ
(%)

AKV
J

Akv
/ (J/cm2)

ZG200-400

920940

------

400

200

25

40

30

6.0

ZG230-450

890-910

620-680

450

230

22

32

25

4.5

ZG270-500

880-900

620-680

500

270

18

25

22

3.5

ZG310-570

870-890

620-680

570

310

15

21

15

3.0

ZG340-640

840-860

620-680

640

340

10

18

10

2.0

 

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