ASTM a178/A 178M Standard Specification for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes
- Standards: ASTM a178 (ASME Sa178)
- Grade: Grade A Grade C Grade D
- Size: OD 1/2in-5in(12.7-127mm)
- Wall thickness:0.035in-0.360in(0.9-9.1mm)
Different name
Condenser steel tube,heat-exchanger tube,low carbon steel pipe,Resistance welded steel tube ,Bolier flues,Spoerheater flues and safe ends,ERW carbon steel pipes.
ASTM a178 Welded Boiler TubeChemical Composition:
| Element % | Grade A | Grade C | Grade D |
| Low carbon steel | Medium Carbon Steel | Manganess Steel | |
| C | 0.06-0.18 | 0.35 Max | 0.27 Max |
| Mn | 0.27-0.63 | 0.80 Max | 1.00-1.50 |
| P | 0.035 | 0.035 | 0.030 |
| S | 0.035 | 0.035 | 0.015 |
| Si | ... | ... | 0.10 Min. |
Mechanical Property:
Grade C & Grade D tubes shall conform to the requirements -tensile properties prescribed below:
TensileRequirements | ||
Data | GradeC | GradeD |
Tensilestrength,min,ksi[MPa] Yieldstrength,min,ksi[MPa] Elongationin2in.or50mm,min,% For longitudinal strip tests a deduction for Each1⁄32-in[0.8mm]decreaseinwallthicknessbelow5⁄16in.[8mm] | 60[415] 37[255] 30 1.50A | 70[485] 40[275] 30 1.50A |
From the basic minimum elongation of the following percentage points shall be made
| Grade A | |
Tensilestrength,min,ksi[MPa] Yieldstrength,min,ksi[MPa] Elongationin2in.or50mm,min,% | 47[325] 26[180] 35 |
Outside diameter and Wall ThicknessTolerance:
| Outside Diameter tol | Wall thickness tol | ||
OD < 50 | ±0.05mm | S < 4mm | ±12.5% |
OD > 50 | ±1% | 4--20mm | +15/-12.5% |
S≧20mm | ±12.5% | ||
Referenced Documents:
ASTM standards:
- A450/A450M Specification for General Requirements for Carbon,Ferritic Alloy,and Austenitic Alloy steel tubes.
- E213 Practice for Ultrasonic Examination of Metal pipe and tubing.
- E273 Practice for Ultrasonic Examination of Longitudinal Welded Pipe and Tubing.
Manufacturing Process: ERW
Heat treatment:
After welding,all tubes shall be heat treated at a temperature of 1650°F(900℃) or higher and followed by cooling in air or in the cooling chamber of a controlled-atmosphere furnace,Cold-drawn tubes shall be heat treated after the final cold-draw pass at a temperature of 1200°F(650℃)or higher.
Surface Condition:
Finished tubes shall be free of scale,A slight amount of oxidation will not be considered as scale.
Mechanical Tests Required:
Flattenting Test/Flaring test/Flange test/Crush test/Tension test/Reverse Flattening test/Hydrostatic or Nondestructive Electric Test
Loading
Bundle package/In budle with plastic bag outside/ In wooden case
Marking as per customer's request 
Paint on the pipe as per customer request 
Usage
Used in boiler, superheater, heat-exchanger and pressure equipment in Petrochemical factory, Refinery factory, sugar mill, power plant, power plant, shipbuilding.
