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Our spec covers electric-resistance-welded, carbon steel tubes to be used for heat exchangers, condensers etc. - details see: https://www.machineto.com/sa214-tube-for-heat-exchanger-10247373

Our spec covers electric-resistance-welded, carbon steel tubes to be used for heat exchangers, condensers, and similar heat-transfer apparatus.

Our tubing sizes usually furnished to this specification are to 3 in. [76.2 mm] in outside diameter, inclusive. Tubing having other dimensions may be furnished, provided such
tubes comply with all other requirements of this specification.

After welding, all tubes shall be heat treated at atemperature of 1650°F [900°C] or higher and followed by cooling in air or in the cooling chamber of a controlled atmosphere furnace.