Seamless steel pipes for highpressure chemical fertilizer processing equipment
Standards:
GB6479 —— China national standards
Uses:
For the Seamless steel pipes for highpressure chemical fertilizer processing equipment
Steel pipes No. of main production:
10、20、16Mn、10MoWVNb、15CrMo、1Cr5Mo、12 Cr2Mo 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）
|
Low temperature Impact Akv
|
|
GB6479
|
10
|
335～490
|
≥205
|
≥24
|
/
|
－20℃≥18
|
|
20
|
410～550
|
≥245
|
≥24
|
≥39
|
－20℃≥18
|
|
16Mn
|
490～670
|
≥320
|
≥21
|
≥47
|
－40℃≥21
|
|
10MoWVNb
|
470～670
|
≥295
|
≥19
|
≥62
|
|
|
15CrMo
|
440～640
|
≥235
|
≥21
|
≥47
|
|
|
1Cr5Mo
|
390～590
|
≥195
|
≥22
|
≥94
|
|
|
12 Cr2Mo
|
450～600
|
≥280
|
≥20
|
≥38
|
|
Chemical composition:
|
Standards
|
Steel pipes No.
|
Chemical composition（％）
|
|
C
|
Si
|
Mn
|
P
|
S
|
Cr
|
Mo
|
Ni
|
|
GB
6479
|
10
|
0.07～0.14
|
0.17～0.37
|
0.35～0.65
|
≤0.030
|
≤0.030
|
/
|
/
|
/
|
|
20
|
0.17～0.24
|
0.17～0.37
|
0.35～0.65
|
≤0.030
|
≤0.030
|
/
|
/
|
/
|
|
16Mn
|
0.12～0.20
|
0.20～0.60
|
1.20～1.60
|
≤0.030
|
≤0.030
|
|
|
|
|
10MoWVNb
|
0.07～0.13
|
0.50～0.80
|
0.50～0.80
|
≤0.030
|
≤0.030
|
/
|
0.60～0.90
|
/
|
|
15CrMo
|
0.12～0.18
|
0.17～0.37
|
0.40～0.70
|
≤0.030
|
≤0.030
|
0.80～1.10
|
0.40～0.55
|
/
|
|
1Cr5Mo
|
≤0.15
|
≤0.50
|
≤0.60
|
≤0.030
|
≤0.030
|
4.00～6.00
|
0.45～0.60
|
≤0.60
|
|
12 Cr2Mo
|
0.80～0.15
|
≤0.50
|
0.40～0.70
|
≤0.030
|
≤0.030
|
2.0～2.50
|
0.90～1.20
|
|
Ps:The residual element content of 10 is Ni≤0.25％、Cr≤0.15％、Cu≤0.20％
The residual element content of 20 is Ni≤0.25％、Cr≤0.25％、Cu≤0.20％、Mo≤0.15％、V≤0.08％
The residual element content of other is Ni≤0.30％、Cr≤0.30％、Cu≤0.20％
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