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GB/T 3094-2000

Chemical composition(%)

C

Mn

Si

S

P

Cr

Ni

Cu

Tensile Strength

Yield Point

Elongation

No less than

Rm

ReH2

A5

N/mm²

N/mm²

%

10

0.07～0.13

0.35～0.65

0.17～0.37

≤0.035

≤0.035

≤0.15

≤0.30

≤0.25

≥335

≥205

≥24

20

0.17～0.23

0.35～0.65

0.17～0.37

≤0.035

≤0.035

≤0.25

≤0.30

≤0.25

≥390

≥245

≥20

35

0.32～0.39

0.50～0.80

0.17～0.37

≤0.035

≤0.035

≤0.25

≤0.30

≤0.25

≥510

≥305

≥17

45

0.42～0.50

0.50～0.80

0.17～0.37

≤0.035

≤0.035

≤0.25

≤0.30

≤0.25

≥590

≥335

≥14

Q345(A～E)

≤0.20

1.00～1.60

≤0.55

≤0.035

≤0.035

--

--

--

≥510

≥345

≥21