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Boiler tubes is a one of seamless pipe. Manufacturing methods is the same as seamless tube, but it has the stringent requirements for manufacture of steel pipes.

A335 Grade P12 Pipe is a low alloy carbon steel (Cr-Mo) that is self quench in air, where the welding adquire high hardnees and residual stress not recomended to put it directly in services that demand critical conditions.

A36 steel pipe is a type of carbon structural steel used in the manufacture of welded and bolted metal structures for industrial and civil buildings and bridge construction.