ASTM A178 Electric Resistance Welded Carbon Steel and Carbon Manganese Steel Boiler and Superheater Tubes
Material: Carbon steel and carbon manganese steel
Production: Electric Resistance Welding
Size range: O.D.: 12.7-127mm W.T.:0.9-9.1mm L: according to customer requirement
Applications: For Boilers, Superheaters, Heat-Exchangers, Condensers, Boiler flues, Superheater flues and Safe ends
Heat treatment:
After welding, all tubes are heat treated at a temperature of 1650℉ (900℃) or higher and followed by cooling in air or in the cooling chamber of a controlled atmosphere furnace.
Cold-Drawn tubes are heat treated after the final cold-draw pass at a temperature of 1200℉(650℃)or higher.
Chemical Properties
Element | Grade A,Low-Cabon Steel | Grade C,Medium-Carbon Steel | Grade D, Carbon-Manganese Steel | |
Carbon | 0.06-0.18 | 0.35 Max | 0.27Max | |
Manganese | 0.27-0.63 | 0.80Max | 1.00-1.50 | |
Phosphorus,Max | 0.035 | 0.035 | 0.030 | |
Sulfur,Max | 0.035 | 0.035 | 0.015 | |
Silicon | - | - | 0.10 min | |
Mechanical Properties | Grade A | Grade C | Grade D | |
Tensile Strength:min ksi(Mpa) | 47(325) | 60(415) | 70(485) | |
Yield Point:min ksi(Mpa) | 26(180) | 37(255) | 40(275) | |
Elongation | ≥35% | ≥30% | ≥30% |