 Standard：GB6479 Chinese national standard
Spec.:φ19mm-φ159mm×2-18mm
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 Cr2Moetc
.Diamensional tolerances:
Types of steel tubes |
Outer diameter |
Wall thickness |
Cold-rolled tubes |
Tube sizes(mm) |
Tolerances(mm) |
Tube sizes (mm) |
Tolerances(mm) |
＞30～50 |
±0.3 |
≤30 |
±10％ |
＞50～219 |
±0.8％ |
Hot-rolled tubes |
＞219 |
±1.0％ |
＞20 |
±10％ |
Mechanical properties：
standard |
Brand |
Tensile strength（MPa） |
Yield strength（MPa） |
Elongation percent（％） |
冲击功（J） |
低温冲击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:
Standard codes |
Models of steel tubes |
Chemical compositions（％） |
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 |
|
NOTE：the residual contents of the elements for the steel 10:Ni≤0.25％、Cr≤0.15％、Cu≤0.20％
the residual contents of the elements for the steel 20:Ni≤0.25％、Cr≤0.25％、Cu≤0.20％、Mo≤0.15％、V≤0.08％
the residual contents of the elements for the steel Ni≤0.30％、Cr≤0.30％、Cu≤0.20％
|
H-P Fertilizer Pipe
Structural Steel Pipe
