ASTM a178/A 178M Standard Specification for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes
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.
Chemical 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% |
||
ASTM standards:
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
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.
specification, Standard and identificationWelded steel pipe (steel pipe manufactured with a weld) is a tubular product made out of flat plates, known as skelp, that are formed, bent and prepared for welding.
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