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Applications
- Boiler Plate (31)
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- Manufacturing (621)
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- Steel Workshop (202)
- Structure Pipe (152)
News
Seamless steel pipes can be used for the high-pressure boiler (working pressure is generally no more than 9.8Mpa, the working temperature of 450 ℃ -650 ℃) tank, economizer, superheater, reheater and so on.
Dimensional tolerances:
|
Types |
Size(mm) |
Allow deviation |
|||
|
Ordinary level |
High level |
||||
|
Hot roll |
Diameter |
≤159 |
+1.0%(min+0.5mm) |
+0.75%(min+0.3mm) |
|
|
>159 |
+1.0% |
+0.90% |
|||
|
Thickness |
<3.5 |
+15%(min+0.48mm) -10% (min-0.32mm) |
+1.0%(min+0.2mm) |
||
|
3.5~20 |
+15% -10% |
+10% |
|||
|
>20 |
D<219 |
+10% |
+7.5% |
||
|
D≥219 |
+12.5% -10.0% |
+10% |
|||
|
Cold roll |
Diameter |
≤30 |
+0.20mm |
+0.15mm |
|
|
>30~50 |
+0.30mm |
+0.25mm |
|||
|
>50 |
+0.8% |
+0.6% |
|||
|
Thickness |
2~3 |
+12% -10% |
+10% |
||
|
>3 |
+10% |
+7.5% |
|||
Mechanical properties:
|
Standard |
Grade/Tensile strength(Mpa) |
Elongation(%) |
|
|
5310-95 |
20G |
410~550 |
≥ 24 |
|
25MnG |
≥ 415 |
≥ 22 |
|
|
15MoG |
450~600 |
≥ 22 |
|
|
15CrMoG |
440~640 |
≥ 21 |
|
|
12Cr2MoG |
450~600 |
≥ 20 |
|
|
12Cr1MoVG |
470~640 |
≥ 21 |
|
Chemical compositions:
|
Stand |
Grade |
Chemical composition |
|||||||||
|
C |
Si |
Mn |
P |
S |
Cr |
Mo |
Cu |
Ni |
|
||
|
GB5310 |
20G |
0.17-0.24 |
0.17-0.37 |
0.35-0.65 |
≤0.030 |
≤0.030 |
/ |
/ |
≤0.20 |
≤0.25 |
/ |
|
20MnG |
0.17-0.24 |
0.17-0.37 |
0.70-1.00 |
≤0.030 |
≤0.030 |
/ |
/ |
≤0.20 |
≤0.25 |
/ |
|
|
15MoG |
0.12-0.18 |
0.17-0.37 |
0.40-0.80 |
≤0.030 |
≤0.030 |
/ |
0.25-0.35 |
≤0.20 |
≤0.30 |
/ |
|
|
15CrMoG |
0.12-0.18 |
0.17-0.37 |
0.40-0.70 |
≤0.030 |
≤0.030 |
0.80-1.10 |
0.40-0.55 |
≤0.20 |
≤0.30 |
/ |
|
|
12Cr2MoG |
0.08-0.15 |
≤0.50 |
0.40-0.70 |
≤0.030 |
≤0.030 |
2.00-2.50 |
0.90-1.20 |
≤0.20 |
≤0.30 |
/ |
|
|
12Cr1MoVG |
0.08-0.15 |
0.17-0.37 |
0.40-0.70 |
≤0.030 |
≤0.030 |
0.90-1.20 |
0.25-0.35 |
≤0.20 |
≤0.30 |
0.15-0.35 |
|
