Boiler tubes is a one of seamless pipe. Manufacturing methods is the same as seamless tube, but it has the stringent requirements for manufacture of steel pipes. According to the temperature level,boiler tube is divided into general boiler tubes and high pressure boiler tube.
The ASTM A192 boiler tubes/ superheater tubes shall be made by the seamless process and shall be either hot-finished or cold-finished. Hot-finished tubes need not be heat treated. Cold-finished tube shall be heat treated after the final cold-finishing at a temperature of 1200°F [650°C] or higher.
ASTM A192
Chemical requirements:
Element | Content, % |
C | 0.06~0.18 |
Mn | 0.27~0.63 |
P | ≤0.035 |
S | ≤0.035 |
Si | ≤0.25 |
Tensile requirements:
Mechanical Property Requirements | |
T.S. min | 47 [325] |
Y.S. min | 26 [180] |
El. in 2" | 35 |
Brinell Hardness | 137 |
Rockwell Hardness, | 77 |
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