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Standard
GB6479 Chinese national standard
Application
Seamless steel tubes for high-pressure chemical fertilizer processing equipment and pipelines thereof
Model No.of steel tubes
10,20,16Mn,10MoWVNb,15CrMo,1Cr5Mo,12 Cr2Mo,etc
Diamensional tolerances:
Types of steel tubes
Outer diameter
Wall thickness
Cold-rolled tubes
Tube sizes(mm)
Tolerances(mm)
Tube sizes (mm)
Tolerances(mm)
3050
±0.3
≤30
±10
Mechanical porperties:
MPa
MPa
J
Akv
GB6479
10
335490
≥205
≥24
/
20≥18
20
410550
≥245
≥24
≥39
20≥18
16Mn
490670
≥320
≥21
≥47
40≥21
10MoWVNb
470670
≥295
≥19
≥62
15CrMo
440640
≥235
≥21
≥47
1Cr5Mo
390590
≥195
≥22
≥94
12 Cr2Mo
450600
≥280
≥20
≥38
Chemical composition:
Standard codes
Models of steel tubes
Chemical compositions
C
Si
Mn
P
S
Cr
Mo
Ni
GB
6479
10
0.070.14
0.170.37
0.350.65
≤0.030
≤0.030
/
/
/
20
0.170.24
0.170.37
0.350.65
≤0.030
≤0.030
/
/
/
16Mn
0.120.20
0.200.60
1.201.60
≤0.030
≤0.030
10MoWVNb
0.070.13
0.500.80
0.500.80
≤0.030
≤0.030
/
0.600.90
/
15CrMo
0.120.18
0.170.37
0.400.70
≤0.030
≤0.030
0.801.10
0.400.55
/
1Cr5Mo
≤0.15
≤0.50
≤0.60
≤0.030
≤0.030
4.006.00
0.450.60
≤0.60
12 Cr2Mo
0.800.15
≤0.50
0.400.70
≤0.030
≤0.030
2.02.50
0.901.20
NOTEthe residual contents of the elements for the steel 10:Ni≤0.25Cr≤0.15Cu≤0.20
the residual contents of the elements for the steel 20:Ni≤0.25Cr≤0.25Cu≤0.20Mo≤0.15V≤0.08
the residual contents of the elements for the steel Ni≤0.30Cr≤0.30Cu≤0.20