PST23F85 Shock-Resistant Tool Steel is a tool steel designed to withstand strong impact and pressure. It has excellent impact resistance and high toughness through special alloy composition and heat treatment process, and can maintain good mechanical properties in extreme working environments.

The main characteristics of this steel are excellent impact resistance and fatigue resistance, which can effectively resist impact loads and reduce damage to tools under high-intensity operations. Its high toughness makes it less likely to break or break under heavy load conditions.

Impact-resistant tool steel is widely used in mechanical parts that require high toughness and impact resistance, such as stamping dies, forging tools, lathe tools, press parts, etc., and is particularly suitable for high-impact, high-load working environments.

7CrSiMnMoV (HMD, CH-1) steel is a tool steel suitable for flame quenching, designed for the manufacture of large and complex cold-working dies. This steel is mainly used for the cutting edge of the die. It is first heated to the quenching temperature by an oxy-acetylene flame, and then air-cooled and hardened. It has minimal deformation and does not require additional processing. The flame-hardened die has a longer service life than carbon tool steel and low-alloy die steel, and can effectively shorten the die production cycle by 10% and reduce costs by 10% to 20%. In addition, the energy consumption during the heat treatment process is also reduced by about 80%, providing an efficient, low-cost, energy-saving innovative process for die manufacturing.

Forging process

7CrSiMnMoV(HMD、CH-1)The steel has low alloy content, no large excess carbides, low plastic deformation resistance, and good forging performance. The forging heating temperatureis 1150 to 1200℃, starting forging temperature 1100 to 1150℃, ending forging temperature 800 to 850℃. Due to the good hardenability of the steel, the surface hardness after forging can reach 50HRC, so it should be air-cooled after forging.

Annealing process

To prevent decarburization,7CrSiMnMoV(HMD、CH-1)the annealing of the steel should be carried out in a protective atmosphere. The commonly used annealing process is to hold at820 to 840℃ and then slowly cool to about 550℃ at a cooling rate of 20 to 30℃/h, followed by air cooling. If a satisfactory granular pearlite structure is required, it can be slowly cooled to 680 to 700℃ after heating and holding, isothermally held for 3 to 6 hours, and then slowly cooled.

The annealing hardness is217 to 241HBS.

Quenching and tempering process

The recommended overall quenching and tempering process is:After holding at 900 to 920℃, oil quenching or graded quenching in 220℃ nitrate salt, tempering at 190 to 200℃ for 1 to 3 hours, hardness is 58 to 62HRC.

Flame quenching process:Flame heating and air cooling quenching can be performed using single or double nozzle flames to achievea hardness of 58HRC. When using a double nozzle, the hardened layer depth can reach 5 to 6mm; with a single nozzle, the hardened layer depth is generally 2 to 3mm.

Mechanical properties

Compared with commonly used mold steels9Mn2V, CrWMn, Cr12MoV,7CrSiMnMoV(HMD、CH-1)the steel has a significant advantage in toughness. Flame quenching can give the surface high hardness, high toughness in the core, and the mold is less likely to crack or chip, while the surface hardened layer forms compressive stress, which can significantly improve fatigue strength and extend the service life of the mold.

Application range

The flame heating quenching process has the advantages of simple equipment, convenient operation, and high production efficiency, and effectively solves the technical difficulties of local quenching of large molds. CH-1 steel has been widely used in many industries such as standard parts, bearings, electronics, and automobiles. CH-1 steel replaces T10A, 9Mn2V, CrWMn, Cr12MoV and other steels to manufacture cold working molds such as blanking dies, punching dies, trimming dies, bending dies, shaping dies, deep drawing dies, and cold heading dies with high toughness requirements, which can significantly improve the service life of the mold by more than 1 to 3 times.