Cylinder tube

Seamless high-pressure cylinders are made either from billets or tubes, The latter production process is very popular among cylinder manufacture. Cylinder tubes are provided as raw material for making cylinders.

The advantages of this cylinder are good external and internal surface quality, uniform wall thickness, light in weight, simplified process procedures, high production efficiency, high yield and low cost.

Specification of high-pressure cylinder tube

Outside Diameters (mm)

Wall Thickness (mm)
60

4.5-5.5
70

4.5-7.0
80

4.5-8.0
102.108.114.121

4.5-10.0
123.127.140(139.7).146.152(152.4)

4.5-12.0
165

5.0-12.0
168

5.0-14.0
178. 180. 182. 194. 204. 219. 223

5.5-15.0
229

5.5-14.0
232

6.0.8.0-18.0
245

8.0-20.0
255.262.267.273.279

7.5-21.0, 24.0-30.0
356

8.5-17.0, 20.0-27.2-, n30.0-36.0
406

8.5-22.0, 25.0-28.0, 35.0-38.0
559

16.0-27.0
610

18.0-30.0
630

18.0-30.0
Chemical composition:

Steel Grade

Chemical composition (%)
C

Si

Mn

P

S

P+S

Cr

Mo

Ni

Cu

V
30CrMo

0.20-0.34

0.17-0.37

0.40-0.70

≤0.030

≤0.025

≤0.050

0.80-1.10

0.15-0.25



≤0.20


34CrMo4

0.30-0.37

≤0.40

0.60-0.90

≤0.035

≤0.030

≤0.050

0.90-1.20

0.15-0.30






37Mn/1

0.36-0.40

0.17-0.37

1.50-1.75

≤0.030

≤0.025

≤0.050

≤0.30





≤0.20


37Mn/2

0.34-0.38

0.17-0.37

1.45-1.70

≤0.030

≤0.025

≤0.050

≤0.30





≤0.20


37Mn/3

0.30-0.37

0.17-0.37

1.40-1.75

≤0.035

≤0.035

≤0.050

≤0.30

≤0.10

≤0.30

≤0.20

0.07-0.12