ASTM A178 Boiler and Superheater Tube


Standards:ASTM A178/ASME SA-178


Outside Diameter: 12.7mm to 127mm

Wall Thickness: 1.2-9.1mm

Length: 6-12m

Type: Round Tube

ASTM A178 is the standard specification for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes. The steel shall be of Grades A (low-carbon steel), C (medium-carbon steel), or D (carbon-manganese steel). At WIHO metals, The ASTM A178 ERW welded tubes we supplied are mainly Grade A and grade C shall be used in manufacturing heating pipelines, containers, coal-saving devices, superheaters, arch superheated tubes, airway tubes etc.


ASTM A178 Tube Equivalent Material

C38D STS42 A178 Gr.C St 45.4/1.0309 20G


ASTM A178 Chemical Composition

Grades C Mn P S Si
Grade A 0.06-0.18 0.27-0.63 0.035 0.04 /
Grade C 0.35 max 0.80 max 0.035 0.035 /
Grade D 0.27 max 1.00-1.50 0.03 0.015 0.01 min


ASTM A178 Mechanical Property

Grades Tensile strength, min, ksi [MPa] Yield strength, min, ksi [MPa] Elongation in 2 in. or 50mm, min, %
Grade A 47[325] 26[180] 35
Grade C 60[415] 37[255] 30
Grade D 70[485] 40[275] 30


WIHO metals supply and stock a large inventory of ASTM A178/ASME SA178(STB33/St35.8) ERW tube used for boiler, superheater, condenser, reheaters, and safe ends. We supply and stock ASTM A178 Grade A, Grade C steel tubes from china’s leading steel mills and we also offer steel additional services like cutting, welding, bending, machining, pre-coating and beveling. For more information on our extensive steel alloys inventory, please contact us or fill in the form below.

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