Seamless steel pipe is made of ingot or solid tube billet by perforation into the capillary, and then by hot rolling, cold rolling or cold dialing made. Mainly divided into: fluid with seamless steel pipe, seamless steel pipe structure, used for conveying water, oil, gas and other fluids, mechanical processing and so on.
Seamless steel pipe heat treatment without tempering after quenching, hardness greater than HRC55 is qualified.
The actual hardness is HRC55. Seamless steel pipe heat treatment after tempering and tempering parts have good comprehensive mechanical properties, widely used in a variety of important structural parts, especially those working under alternating load connecting rod, bolts, gears and shafts, etc. But the surface hardness is low, not wear-resistant. The surface hardness of parts can be improved by quenching and tempering.
Seamless steel pipe in the heat treatment of carburizing treatment is generally used for surface wear resistance, core impact resistance of heavy duty parts, its wear resistance than quenching and tempering + surface high quenching.
Its surface carbon content is 0.8-1.2%, the core is generally 0.1-0.25%. After heat treatment, the surface can obtain a high hardness, the core of low hardness, impact resistance.
