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GB6479 Seamless steel pipes
GB6479 Seamless steel pipes

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We are the best manufacturer and merchant in china,and we can supply all kinds of seamless steel pipes.

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

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