ASTM A210 / A210M

This specification2 covers minimum-wall-thickness,seamless medium-carbon steel, boiler tubes and boiler flues,including safe ends (see Note 1), arch and stay tubes, and superheater tubes. NOTE 1 —This type is not suitable for safe ending by forge welding.The tubing sizes and thicknesses usually furnished to this specification are 1⁄2 in. to 5 in. [12.7 to 127 mm] in outside diameter and 0.035 to 0.500 in. [0.9 to 12.7 mm], inclusive, in minimum wall thickness. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this specification. Mechanical property requirements do not apply to tubing smaller than 1⁄8 in. [3.2 mm] in inside diameter or 0.015 in. [0.4 mm] in thickness.

Chemical Properties

Grade	Carbon, max	Manganese, max	Phosphorus, max	Sulfur, max	Silicon, max
Grade A1	0.27	0.93 max	0.035	0.035	0.10
Grade C	0.35	0.29 – 1.06	0.035	0.035	0.10

Note: A For each reduction of 0.01 % below the specified carbon maximum, an increase of 0.06 % manganese above the specified maximum will be permitted up to a maximum of 1.35 %.

Mechanical Properties

Grade	Tensile strength, min, ksi [MPa]	Yield strength, min, ksi [MPa]	Elongation in 2 in. or 50 mm, min, %
Grade A1	60 [415]	37 [255]	30
Grade C	70 [485]	40 [275]	30