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ASTM A178 ERW Tubes

July 24, 2020

General Introduction

ASTM A178 Gr.A tubes

ASTM A178 Grade A ERW tubes, Φ63.5 mm x (w.t)3.4 mm x (length)10060 mm, for an Indonesian client in Jakarta.

ASTM A178, identical with ASME SA-178, is the standard specification covering minimum-wall-thickness, 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. There are three grades available: Grade A – low-carbon steel, Grade C – medium-carbon steel, Grade D – carbon-manganese steel.

Sizes & Thicknesses

The tubing sizes and thicknesses usually furnished to ASTM A178 are 1/2″ to 5″ [12.7 mm to 127 mm] in outside diameter and 0.035″ to 0.320″ [0.9 mm to 9.1 mm], inclusive, in minimum wall thickness. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of ASTM A178/ ASME SA-178.

Chemical Composition Requirements

ElementASTM A178/ ASME SA-178
Grade AGrade CGrade D
*All composition values are in %.

Mechanical Properties

ASTM A178Grade CGrade D
EL. in 2"
min. %
*T.S.: tensile strength; *Y.S.: yield strength; *EL.: elongation.

Manufacture & Heat Treatment

The ASTM A178 Grade D steel shall be killed. ASTM A178 tubes shall be made by electric-resistance welding process. 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°F [650°F] or higher.

Testing & Inspection

ERW tubes made from ASTM A178 steel may be tested or inspected in the following ways covering crush test, flattening test, flange test, tension test, reverse tension test, hydrostatic test, nondestructive electric test, dimension inspection, visual examination, as well as ultrasonic inspection.

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