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Steel Section
Home > Tangshan Jikuang Mining Supplies Co.,ltd

U-Type Steel For Mine Timbering

Standard:  GB/T 4697-2008

Model Number

18UY

25UY

25U

29U

36U

40U

Sectional Areac㎡)

24.15

31.54

31.79

37

45.69

51.02

Theoretical Weight(㎏/m)

18.96

24.76

24.95

29

29

40.05

Height (mm)

99

110

120

124

138

141.9

Collar Extension (mm)

122

134

135

150.5

171

171

Main parameters of

Moment of inertia/cm4

Ix

284.26

451.70

495.81

612.01

928.05

1064.07

IY

331.35

508.70

551.97

771.01

1244.8

1366.98

Radius of inertia/cm

ix

3.43

3.78

3.95

4.07

4.51

4.57

iy

3.70

4.02

4.17

4.57

5.22

5.18

Material

20MnK

25MnK

20MnK

chemical composition:%

C

0.15-0.26

0.21-0.31

0.17-0.24

Si

0.20-0.60

0.20-0.60

0.17-0.37

Mn

1.20-1.60

1.20-1.60

1.20-1.60

Y

 

 

0.07-0.17

Alt

≥0.015

≥0.015

 

P

≤0.045

≤0.045

≤0.045

S

≤0.045

≤0.045

≤0.045

Grade

Specifications

Tensile test

impact test

Bend test

tensile strength

Rm/MPa

Yield strength

ReH/Mpa

Elongation

A/%

Temperature

V type gap

Akv/J

180 d=Bending diametermm a=Sample thicknessmm

 

20MnK

18UY
25UY
25U 
29U

490

335

20

 

 

d=3a

20MnVK

570

390

20

25MnK

530

335

20

530

335

20

20MnK

36U
40U

530

350

20

20℃

27

d=3a

20MnVK

580

390

20

20℃

27

d=3a