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Standard: ASTM A192
Seamless carbon steel boiler tubes for high-pressure service
● Application: for boilers, super heaters, heat-exchangers, and high- pressure.
● Size range: O.D.: 6-101.6mm W.T.: 1-15mm L: 12000mm max.
Table 1: Steel grade and chemical composition:
| C | 0.06-0.18 |
| Mn | 0.27-0.63 |
| P | ≤0.035 |
| S | ≤0.035 |
| Si | ≤0.25 |
Mechanical property:
Tensile strength: min 47 ksi (325 Mpa)
Yield strength: min 26 ksi (180Mpa)
Elongation: ≥35%
Hardness
Brinell hardness: W.T≥0.200 inches (5.1mm), then 137HB
Rockwell hardness: W.T≥0.200 inches (5.1mm), then 77HRB
Tolerance for O.D. and W.T.(SA-450/SA-450M)
| O.D. inch (mm) | + | - | W.T. inch (mm) | + | - |
| <1”(25.4) | 0.10 | 0.10 | ≤1.1/2”(38.1) | 20% | 0 |
| 1”-1.1/2”(25.4-38.1) | 0.15 | 0.15 | >1.1/2”(38.1) | 22% | 0 |
| 1.1/2”-2”(38.1-50.8) | 0.20 | 0.20 | - | - | - |
| 2”-2.1/2”(50.8-63.5) | 0.25 | 0.25 | - | - | - |
| 2.1/2”-3”(63.5-76.2) | 0.30 | 0.30 | - | - | - |
| 3”-4”(76.2-101.6) | 0.38 | 0.38 | - | - |
