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ASTM A178 Welded Steel Boiler Tubes
This specification covers standards for electric-resistance-welded tubes with minimum-wall-thickness made of carbon steel and carbon-manganese steel to be used in boiler tubes, boiler flues, superheater flues, and safe ends.
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This standard specification use for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes.
1.Chenmical composition
| Element | Grade A Low-carbon steel | Grade C Medium-carbon steel | Grade D Carbon-Man-ganese steel |
| C | 0.06-0.18 | 0.35max | 0.27max |
| Mn | 0.27-0.63 | 0.80max | 1.00-1.50 |
P max | 0.035 | 0.035 | 0.030 |
| S max | 0.035 | 0.035 | 0.015 |
| Si | ... | ... | 0.10min |
2.Mechanical property
| Tensile strength min Mpa | 325 |
| Yiled Strength min Mpa | 180 |
| Elongation in 2 or 50mm min % | 35 |
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