Seamless Steel Tube for Gas Cylinder

Standard:
GB18248 Standard of China Metallurgical Industry

Application:
For gas bottle manufacturing

Grade and Chemical Composition (%)
Grade C Si Mn P S P+S Cr Mo Ni Cu
37Mn 0.34~0.4 0.1~0.3 1.35~1.65 ≤0.03 ≤0.03 ≤0.055 ≤0.3 - ≤0.3 ≤0.2
30CrMo 0.26~0.34 0.17~0.37 0.4~0.7 ≤0.03 ≤0.03 ≤0.055 0.8~1.1 0.15~0.25 ≤.3 ≤0.2
35CrMo 0.32~0.4 0.17~0.37 0.4~0.7 ≤0.03 ≤0.03 ≤0.055 0.8~1.1 0.15~0.25 ≤0.3 ≤0.2
34CrMo4 0.3~0.4 0.15~0.35 0.5~0.8 ≤0.02 ≤0.01 ≤0.025 0.9~1.2 0.15~0.25 ≤0.4 -
Note: 32CrMo4 can be provided as per agreement
Dimension Tolerances:
Allowed tolerances of OD and WT
Pipe Category OD Tolerances % WT Tolerance%
Hot Rolled ±1.0 +15 -10
Cold Drawn ±0.75 +12.5 -10
Grade and Manufacturing Specification of Seamless Steel Tube for Gas Cylinder
Grade Specification Executive Standard
Outer Diameter /mm Wall Thickness /mm Economical Length /m
37Mn
37Mn/1
37Mn/2
30CrMo
35CrMo
34CrMo4
34CrMo4/1
34CrMo4/2
34CrMo4A
30CrMoQC
4130X
30CrMoE
42CrMoE
10 ~ 127 1 ~ 20 6 ~ 12.0 GB18248 , GB28884 and Technical Protocol
42 ~ 114 3.5 ~ 12 6 ~ 12.2
73 ~ 180 3.8 ~ 22 6 ~ 12.2
68 ~ 254 10 ~ 55 6 ~ 12.2
140 ~ 368 6 ~ 42 6 ~ 12.2
318 ~ 720 14 ~ 120 4 ~ 12.5
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