Seamless steel pipes for cracking of petroleum
Standards:
GB9948 —— China national standards
Uses:
For the Seamless steel pipes for petroleum, refinery furnace pipe and heat exchangers
Steel pipes No. of main production:
10、20、15CrMo、1Cr2Mo、1Cr5Mo ect.
Dimensional tolerance:
|
Pipe types
|
Outer-caliber（D）
|
Thickness（S）
|
|
|
Pipe outer-caliber(mm)
|
Allowable warp(mm)
|
Pipe thickness(mm)
|
Allowable warp(mm)
|
|
Hot-rolled pipes
|
＞219
|
±1.0％
|
＞20
|
±10％
|
Mechanical Properties:
|
Standards
|
Steel pipes No.
|
Tensile strength（MPa）
|
Bend strength（MPa）
|
Elongation（％）
|
Impact energy（J）
|
Brinell hardness（HB）
|
Delivery state
|
|
GB9948
|
10
|
330～490
|
≥205
|
≥24
|
/
|
/
|
Normalizing
|
|
20
|
410～550
|
≥245
|
≥21
|
≥39
|
/
|
Normalizing
|
|
15CrMo
|
440～640
|
≥235
|
≥21
|
≥47
|
≤170
|
Normalizing and backfire
|
|
1Cr2Mo
|
≥390
|
≥175
|
≥22
|
≥92
|
≤179
|
Normalizing and backfire
|
|
1Cr5Mo
|
≥390
|
≥195
|
≥22
|
≥92
|
≤187
|
Anneal
|
Chemical composition:
|
Standards
|
Steel pipes No.
|
Chemical composition（％）
|
|
C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Mo
|
Ni
|
|
GB9948
|
10
|
0.07～0.14
|
0.17～0.37
|
0.35～0.65
|
≤0.035
|
≤0.035
|
≤0.15
|
/
|
≤0.25
|
|
20
|
0.17～0.24
|
0.17～0.37
|
0.35～0.65
|
≤0.035
|
≤0.035
|
≤0.25
|
/
|
≤0.25
|
|
15CrMo
|
0.12～0.18
|
0.17～0.37
|
0.40～0.70
|
≤0.035
|
≤0.035
|
0.80～1.10
|
0.40～0.55
|
≤0.30
|
|
1Cr2Mo
|
≤0.15
|
0.50～1.00
|
0.30～0.60
|
≤0.035
|
≤0.030
|
2.15～2.85
|
0.45～0.65
|
/
|
|
1Cr5Mo
|
≤0.15
|
≤0.50
|
≤0.60
|
≤0.035
|
≤0.030
|
4.00～6.00
|
0.45～0.60
|
≤0.60
|
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