Manufacturing process of high-speed steel


The heat treatment process of high-speed steel is relatively complex, and it must undergo a series of processes such as quenching and tempering. Quenching is generally carried out in two stages due to its poor thermal conductivity. Preheat at 800~850 ℃ (to avoid causing large thermal stress), then quickly heat to a quenching temperature of 1190~1290 ℃ (different grades may have different temperatures when actually used), and then oil cool, air cool, or gas filled cool. Salt furnaces are used for heating in factories, and vacuum furnaces are now widely used. After quenching, a portion (about 30%) of residual austenite remains in the internal structure, which does not transform into martensite, affecting the properties of high-speed steel. In order to transform the residual austenite and further improve its hardness and wear resistance, it is generally necessary to conduct 2-3 times of tempering at a temperature of 560 ℃, with each time holding for 1 hour.

Production and manufacturing method: Usually produced by electric furnace, high speed steel was produced by powder metallurgy method, which made carbide distribute evenly on the substrate as extremely fine particles, improving its service life.

Purpose: Used for manufacturing various cutting tools. Such as turning tools, drill bits, hobs, machine saw blades, and molds with high requirements.

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