Steel Grade

GB Standard

Carbon

%

Silicon

%

Manganese

%

Phosphorus

%

Sulphur

%

Chromium

%

Nickel

%

Cuprum

%

60#

0.60-0.61

0.18-0.22

0.52-0.59

0.012

0.007

0.06-0.07

0.05

0.18

65#

0.65

0.21

0.56

0.013

0.008

0.05

0.04

0.14

65Mn

0.60-0.70

0.10-0.25

0.70-1.00

0.030

0.030

0.20

0.20

0.25

70#

0.69-0.71

0.19-0.21

0.53-0.58

0.010-0.012

0.003-0.006

0.01-0.05

0.02-0.04

0.04

72A 72B

0.72

0.19

0.71

0.013

0.006

0.02

0.02

0.03

80#

0.80-0.81

0.22-0.24

0.59-0.76

0.008

0.004

0.04

82A 82B

0.82

0.24-0.25

0.76-0.77

0.011-0.014

0.004-0.007

0.17-0.17

Diameter mm

Tolerance mm

Weight of zinc coating(no less than) g/m²

Strength of extension Mpa

Rate of elongation LO=200mm(no less than)

Resistance coefficient Ωmm²/m(20°C)

1

2

1.5

+0.08

-0.04

150

230

12

Normal:ρ20≤0.132

With copper:

ρ20≤0.146

2.0

190

240

2.5

210

260

1000~1750

3.0

230

275

4.0

+0.10

-0.06

245

290

5.0

6.0

Diameter/mm

Tensile Strength/MPa

Weight of zinc-coat/g

200-2.50

1340-1620

185-215

2.50-3.00

1310-1590

230

3.00-3.50

1290-1550

245

3.50-4.25

1290-1520

260

4.25-4.75

1490-175

275