ASTM A178 Welded Boiler Tube

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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 Tube

Chemical Composition:

Element %Grade AGrade CGrade D
Low carbon steelMedium Carbon SteelManganess Steel
C0.06-0.180.35 Max0.27 Max
Mn0.27-0.630.80 Max1.00-1.50
P0.0350.0350.030
S0.0350.0350.015
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 tolWall 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.

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