ASTM A179 and A214 are both carbon steel specifications for heat exchanger and condenser tubes, and both take their general requirements from ASTM A450/A450M. The difference is not strength — it is the wall. A179 is seamless and cold-drawn, with no joint. A214 is electric-resistance-welded from strip, with a longitudinal weld that governs its pressure design and inspection. Seamless buys reliability in high-pressure, high-temperature or weld-sensitive duty; welded buys cost in moderate service. The choice is set by the design code and the medium, not by price alone.

DIN 17175 ST35.8 Seamless Boiler Tubes Shipped to Vietnam, 306 Tonnes in Three Phased Lots

E355 Honed Tube Sizes Chart