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Petroleum Cracking Tube

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

Quality is basically no problem.

                                                                                                                                            ___Matthew(Netherlands)

Price is good.

                                                                                                                                            ___Joshua(Switzerland)

Packing is bad.

                                                                                                                                            ___Hudson(Cyprus)

Delivery is according to the contract and not delay.

                                                                                                                                            ___Antoine(Israel)