Introduction XW-42 is a Swedish grades, equivalent to our national standard Cr12Mo1V1, is a molybdenum, vanadium high carbon, high-chromium alloy tool steel, is often recommended as a good wear resistance required and appropriate toughness (impact ) die; XW-42 is suitable for use in large-scale mold inserts. In addition to its range is suitable for XW-5 applications, usually can be used on cutting thick and loads of forming mold. Chemical Composition (%) C Si Mn Cr Mo V 1.2379 1.55 0.30 0.40 11.80 0.80 0.80 ① soft annealing heat treatment: Under the protection of the atmosphere, heated to 850 ℃, soaking after an hour 10 ℃ furnace cooling to 650 ℃, then air cooling. ② eliminate stress: After rough machining, should be heated to 650 ℃, soaking two hours, slowly cooled to 500 ℃, and then cooled. ③ sclerosis (hardening) treatment: preheating temperature: 650-750 ℃; austenitizing temperature: 990-1050 ℃, usually select 1000-1040 ℃. ④ quenching medium: oil cooling (for very simple mold only); in a vacuum oven, air-cooled high-speed gas flow / gas; salt furnace or fluidized oven, 180-500 ℃, after quenching air cooling. Note: The mold is cooled to 50-70 ℃, immediately after tempering (XW-42 all the standard sizes of molds can hardenability) ⑤ Tempering: tempering twice and each time after tempering are cooled to room temperature, the minimum tempering temperature is 180 ℃, holding time at temperature for two hours. ⑥ quenching dimensional change (sample size: 100 × 100 × 25 mm) of cryogenic treatment of workpieces that require high dimensional stability should be used cryogenic treatment, such treatment is mainly used in the gauge gauges and certain structural components. Immediately after quenching the workpiece is cooled to between -80 ℃ -70 ℃ to [1], for 3-4 hours, and then tempering, cryogenic treatment can improve the hardness of the workpiece 1-3HRC, avoiding the complex shape of the mold to avoid increasing the risk of rupture . Aging temperature is 110-140 ℃, holding time of 25-100 hours. Nitriding the workpiece surface after nitriding hardened layer, which has high wear resistance and corrosion resistance, while corrosion resistance is also improved. Nitrogen at 525 ℃ after nitriding process, the workpiece surface hardness of about 1150HV1.570 ℃ soft nitriding two hours after treatment, the workpiece surface hardness of about 800 HV1 with this hardness of hardened layer is 10-20 microns. Characteristics ︰XW-42 is a high carbon, high-chromium alloy tool steel containing molybdenum, vanadium, and its features are: high wear resistance after high compressive strength of hardened high surface hardness excellent overall hardenability hardened excellent stability excellent resistance to temper softening purpose ︰ XW-42 is often recommended as a good wear resistance required and appropriate toughness (impact) of the mold. In addition to its range is suitable for XW-5 applications, usually can be used on cutting thick and loads of forming mold.