127MM OD ASTM A178 Gr.A Seamless Boiler Tube
ASME SA-178/SA-178M ELECTRIC-RESISTANCE WELDED CARBON STEEL PIPES
Seamless STEEL BOILER TUBES/SUPERHEATER TUBES/ERW STEEL PIPES
ASME A178/A178M ELECTRIC-RESISTANCE WELDED BOILER TUBES/ERW ROUND BOILER TUBING/BENDING TUBES
1.This specification covers minimum-wallthickness,electric-resistance-welded tubes made of carbon
steel and carbon-manganese steel intended for use as boiler tubes, boiler flues, superheater flues, and
safe ends.
2.The tubing sizes and thicknesses usually furnished to this specification are 1⁄2 to 5 in. [12.7 to 127 mm]
in outside diameter and 0.035 to 0.320 in. [0.9 to 9.1mm], inclusive, in minimum wall thickness. Tubing
having other dimensions may be furnished, providedsuch tubes comply with all other requirements of this
specification.
3.Reference ASTM Standards:
A 226/A 226M Specification for Electric-Resistance-Welded Carbon Steel Boiler and Superheater Tubes
for High-Pressure Service
A 450/A 450M Specification for General Requirementsfor Carbon, Ferritic Alloy, and Austenitic Alloy Steel
Tubes
A 520 Specification for Supplementary Requirements for Seamless and Electric-Resistance-Welded Carbon
Steel Tubular Products for High-Temperature Service Conforming to ISO Recommendations for Boiler Construction.
E 213 Practice for Ultrasonic Examination of Metal Pipe and Tubing
E 273 Practice for Ultrasonic Examination of Longitudinal Welded Pipe and Tubing
A 450/A450M Test report required (Certification Section of Specification A 450/A 450M)
4.The steel for Grade D shall be killed.
5.Tubes shall be made by electric-resistance welding tubes/ERW tubing
6.The ERW metal tubes including steel grade A.C,D
7.After welding, all tubes shall be heat treated at a temperature of 1650°F [900°C] 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° [650°C] or higher.
8.Steel round tubing/ERW tubes Including Grade(A.C.D) Chemical Requirements:
|
Element of Steel tubes |
Grade A
low-Carbon Steel
|
Grade C
Medium-Carbon Steel
|
Grade D
Carbon-Manganese Steel
|
|
Carbon
|
0.06-0.18
|
0.035 max
|
0.27 max
|
|
Manganese
|
0.27-0.63
|
0.80 max
|
1.00-1.50
|
|
Phosphorus, max
|
0.035
|
0.035
|
0.030
|
|
Sulfur, max
|
0.035
|
0.035
|
0.015
|
|
Silicon
|
...
|
...
|
0.10 min
|
|
Grade C
|
Grade D
|
|
| Tensile Strength, min, ksi [MPa] |
60 [415]
|
70 [485]
|
| Yield Strength, min, ksi [MPa] |
37 [255]
|
40 [275]
|
| Elongation in 2 in. or 50mm, min, % |
30
|
30
|
Tags:SA178 welded Steel tubes,SA178 welded Steel pipes;A178 steel pipes;Welded tubing;
U-pipes,U-bending pipes,Bending pipes
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