Sheet Metal · 2022年1月5日

What is XW42 steel? What are the application areas of XW42 steel?

①High wear resistance;

②High compressive strength;

③High surface hardness after hardening;

④Excellent overall hardenability;

⑤It has excellent stability when hardened; in addition to being suitable for XW-5 application range, it can usually be used on thick cutting and load forming molds. Hardened and tempered to 62HRC, its physical properties at room temperature and high temperature.

Common quenching and tempering specifications are quenching temperature 1025°C, tempering temperature 180°C/250°C, hardness 61HRC/58HRC. Secondary hardening quenching and tempering specification quenching temperature 1050°C, tempering temperature 520°C, hardness 60HRC. (Approximate value): In the welding process of the die steel, proper protective measures can be taken to obtain a good welding effect (such as increasing the welding operating temperature, welding seam pre-processing, suitable welding rods and welding procedures, etc.). If the mold must be polished or photo-etched after repair welding, the welding rod must be selected with the same chemical composition as the mold steel.

Heat treatment

① Soft annealing: in a protective atmosphere, heat to 850°C, after soaking, cool to 650°C at 10°C per hour, and then cool in air.

② Stress relief: After rough processing, the mold should be heated to 650℃, soaked and kept for two hours, slowly cooled to 500℃, and then air-cooled.

③ Hardening (quenching) treatment: preheating temperature: 650-750°C; austenitizing temperature: 990-1050°C, usually 1000-1040°C. Holding time = the duration of the mold as a whole is heated to the austenitizing temperature. During the hardening process, the mold must be protected to prevent decarburization and oxidation.

④Quenching medium: oil cooling (only for very simple molds); in a vacuum furnace, high-speed gas cools the flowing air/gas; in a salt furnace or fluid furnace, 180-500℃, air cooling after stage quenching. Note: The mold is cooled to 50-70°C, and then immediately tempered (all XW-42 molds of standard specifications and sizes can be quenched) ⑤ Tempering: tempering twice and cooling to room temperature after each tempering, the lowest tempering The temperature is 180°C, and the temperature is kept for at least two hours each time.

⑥Dimensional changes during quenching (sample size: 10010025mm)

⑦ Cryogenic treatment: workpieces with high dimensional stability requirements should be treated with cryogenic treatment. This type of treatment is mainly used for gauges and certain structural parts. After quenching, immediately cool the workpiece to between -70°C and -80°C, keep it for 3-4 hours, and then temper it. Cryogenic treatment can increase the hardness of the workpiece by 1-3HRC, avoiding complex shapes to avoid increasing the risk of cracking. The aging temperature is 110-140℃, and the holding time is 25-100 hours.

⑧ Nitriding treatment: After the workpiece is nitrided, a hardened layer is formed on the surface, which has high wear resistance and corrosion resistance, and the corrosion resistance is also improved. After nitriding at 525°C in nitrogen, the surface hardness of the workpiece is about 1150HV1. After nitrocarburizing at 570°C for two hours, the surface hardness of the workpiece is about 800 HV1. The hardened layer with this hardness is 10-20 microns. EDM If the mold is quenched and tempered and then subjected to EDM, one additional tempering should be added. The tempering temperature is 25 ℃ lower than the previous tempering temperature. Chinese GB standard grade Cr12Mo1v1, American AISI/ASTM standard grade D2, Japan.JIS standard grade SKD11, Swedish ASSAB (ASSAB) standard grade XW42, German DIN standard grade X155CrVMo121, German DIN standard material number 1.2379, Japan Hitachi (HITACHI) Standard grade SLD, DAIDO standard grade DC11, NACHI standard grade CDS11, Austria BOHLER standard grade K110, Sweden ASSAB (ASSAB) standard grade XW41.

1) Mainly used for fine punching dies, embossing dies, cold extrusion dies, cold forging dies, deep drawing dies, crimping dies.

2) It is often recommended for molds that require good wear resistance and appropriate toughness (impact resistance), as well as precision metal molds, semiconductor molds, etc.

3) Used for cold extrusion forming dies and screw hobbing plates.

4) Used for abrasive plastic molding molds, etc.

5) Mainly used for molds with high wear resistance requirements

6) Used for stamping dies and various forming dies with high service life.

7) Used for blanking, extrusion, cold heading, deep drawing and other molds, thread rolling boards, rolls, turning tools, etc.

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