Tubería de caldera
Standard: GB3087-1999, ASTM A179, ASTM A106, JIS G3454
Application: Used for manufacturing superheated pipelines, the steam pipe, boiling water tube, flue tube, small flue tube, etc.of low, mediam pressure boiler, the general industry boiler
Out Diameter Torlerances
| Standard |
Out Diameter |
Tolerance |
| GB3087 |
≤180 |
±1.0%(min: ±0.5mm) |
| GB5310 |
≤50 |
±0.5mm |
| >50 |
±1.0% |
Wall Thickness Tolerances
| Standard |
Wall Thickness(mm) |
Tolerance |
| GB3087 |
3-20 |
+15%,12.5% |
| >20 |
±12.5% |
|
| GB5310 |
<3.5 |
+15%,-10% |
| 3.5-20 |
+15%,-10% |
|
| >20 |
±10% |
Chemical composition and mechanical properties
| Standard |
Grade |
Chemical composition(%) |
Mechanical properties |
||||||
| C |
Si |
Mn |
P |
S |
Tensile Strength(Mpa) |
Yield Strength(Mpa) |
Elongation(%) |
||
| DIN17175 |
St35.8 |
≤0.17 |
0.10-0.35 |
0.40-0.80 |
≤0.030 |
≤0.030 |
360-480 |
≥235 |
≥25 |
| St45.8 |
≤0.21 |
0.10-0.35 |
0.40-1.20 |
≤0.030 |
≤0.030 |
410-530 |
≥255 |
≥21 |
|