The heat treatment process of high-speed steel is relatively complex and must go through a series of processes such as quenching and tempering. Quenching is generally performed in two stages due to its poor thermal conductivity. First preheat at 800~850℃ (to avoid causing large thermal stress), then quickly heat to the quenching temperature of 1190~1290℃ (the actual temperature of different grades is different), and then oil cooling or air cooling or inflatable body cooling. Factories all use salt furnaces for heating, and now vacuum furnaces are also widely used. After quenching, some (about 30%) retained austenite remains in the internal structure and has not been transformed into martensite, which affects the performance of high-speed steel. In order to transform the retained austenite and further improve the hardness and wear resistance, tempering is generally performed 2 to 3 times at a tempering temperature of 560°C and heat preservation for 1 hour each time.

It is usually manufactured using electric furnaces. Powder metallurgy has been used to produce high-speed steel, which allows the carbides to be evenly distributed on the matrix in extremely fine particles, thus improving its service life. It is mainly used to manufacture various cutting tools. Such as turning tools, drill bits, hobs, machine saw blades and demanding molds, etc.

High-speed steel is a complex type of steel with a carbon content generally between 0.70 and 1.65%. Containing a large amount of alloying elements, the total amount can reach 10 to 25%.

According to the different alloying elements contained, it can be divided into:

①Tungsten-based high-speed steel (containing 9 to 18% tungsten);

② Tungsten-molybdenum high-speed steel (containing 5 to 12% tungsten and 2 to 6% molybdenum);

③High-molybdenum high-speed steel (containing 0 to 2% tungsten and 5 to 10% molybdenum);

④Vanadium high speed steel, according to the vanadium content, is divided into high speed steel with general vanadium content (containing 1 to 2% vanadium) and high vanadium content (containing 2.5 to 5% vanadium);

⑤Cobalt high-speed steel (containing 5 to 10% cobalt).

If you have any unclear questions, you can contact the sales staff of Conson Materials for consultation at any time.