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Standard:GB9948-1988

Application: For manufacturing of furnace tubes, heat exchangers and pipelines in refineries

Tolerance on Dimensions

Pipe Types Pipe Size (mm) Tolerances
Hot Rolled OD ≤159 ±1.0%
>159 ±1.20%
WT ≤20 ±12.5%
>20 ±10.0%
Cold Drawn OD ≤30 ±0.20mm
30-50 ±0.30mm
>50 ±0.8%
WT ≤3 +12%  -10%
>3 ±10%

Chemical composition and mechanical properties

Grade Chemical Composition Mechanical Properties
C Mn Si Cr Mo Ni S P Tensile Strength(Mpa) Yield Strength(Mpa) Elongation(%)
10 0.07-0.14 0.35-0.65 0.17-0.37 ≤0.15 ≤0.25 ≤0.035 ≤0.035 330-490 ≥205 ≥24
20 0.17-0.24 0.35-0.65 0.17-0.37 ≤0.25 ≤0.25 ≤0.035 ≤0.035 410-550 ≥245 ≥21
12CrMo 0.08-0.15 0.40-0.70 0.17-0.37 0.40-0.70 0.40-0.55 ≤0.30 ≤0.035 ≤0.035 410-560 ≥205 ≥21
15CrMo 0.12-0.18 0.40-0.70 0.17-0.37 0.80-1.10 0.40-0.55 ≤0.30 ≤0.035 ≤0.035 440-640 ≥235 ≥21
1Cr2Mo ≤0.15 0.30-0.60 0.50-1.00 2.15-2.85 0.40-0.65 ≤0.035 ≤0.035 ≥390 ≥175 ≥22
1Cr5Mo ≤0.15 ≤0.60 ≤0.60 4.00-6.00 0.45-0.60 ≤0.60 ≤0.035 ≤0.035 ≥390 ≥195 ≥22