High quality carbon steel, craft pure, bright NBK (no oxidation state), heat tube wall in nondestructive testing, special equipment and pressure flushing, scrub oily-type rust on steel processing, both for block as dustproof.
High precision, good brightness, after heat pipe outer wall and inner wall without oxidation layer of inner tube, cleanness, under great pressure, cold bending deformation, flaring, squash, no crack can make various complex mechanical deformation and processing. Steel pipe with white color: shallow ash.
Hydraulic system, car with steel tube and tube with other precision of cleanness, smoothness, and mechanical properties of high requirements.