Sweden ASSAB 
 8402 hot work die steel casting 
 The main chemical components: 
 C: 0.38 

 Si: 1.00 

 Mn: 0.40 

 Cr: 5.30 

 Mo: 1.30 

 V: 0.90 

 8402 imported mold steel Description: 
 8402 is a chromium - molybdenum - vanadium alloy tool steel, its characteristics are as follows: 
 1, high and low temperatures have good abrasion resistance 
 2, excellent toughness and ductility 
 3, stable and good and the processing and polishing of 
 4, excellent high temperature strength and thermal fatigue 
 5, excellent hardenability 
 6, the small size of deformation heat treatment 
 Toughness and ductility for demanding die-casting mold, forging mold, it is recommended to use advanced H13 steel-ASSAB 8407. 

 8402 imported mold steel is used for: 
 Extrusion mold: mold, mold care, mold base, bush, like a block, push rod; 
 Plastic mold: mass production of thermoplastic injection molding, surface demanding thermosetting plastic mold; 
 Other uses: steel plate cold punch, scrap shear, thermal cutting, mold rings (for example: for fastening metal mold), wear-resistant parts. 

 ASSAB 8402 imported mold steel heat treatment: 
 1, soft annealed 
 Under protective atmosphere, heated to 850 ℃, both heat per hour and furnace cooling rate of 10 ℃ to 650 ℃ and then cooled. 
 2, eliminate stress 
 After rough machining, mold, insulation should be heated to 650 ℃ for two hours, slowly cooled to 500 ℃, then cooled. 
 3, sclerosis (hardening) process 
 Preheat temperature :600-850 ℃, hardening temperature :980-1030 ℃, usually selected 1020 ℃. 
 Overall holding time = mold heated to quenching temperature continued between. Mold in the hardening process, must be protected in order to control decarburization and oxidation. 
 4, the quenching medium 
 ? High-speed cycle gas or air? Pressure gas cooled vacuum furnace? Flow pattern in the salt furnace or furnace, indoor air-cooled quenching levels, were quenching temperature: ~ 200 ℃ or 450 ~ 550 ℃ hold time from 1 to 100 minutes? Warm oil cooling 
 Note: The overall die immediately after cooling to 50-70 ℃ tempered. 
 5, tempering 
 According to the hardness required, select the tempering temperature. Tempering Tempering is the second time and cooled to room temperature, the minimum tempering temperature of 180 ℃, holding time of at least 2 hours. Avoid tempering between 425-525 ℃. 
 Tempering at 425-525 ℃ for its cause among the lower toughness usually should be avoided. 
 6, the dimensional changes in hardening 
 Note: The total size of changes in quenching and tempering should be equal to the size of changes in value and 

 8402 nitrided die steel imports: 
 Mold formed by nitriding the surface of the nitride layer of hard, high wear resistance and corrosion resistance to charge, but its toughness is poor, vulnerable or subject to mechanical stress because of the impact of thermal stress cracking or spalling, and nitrogen thicker the layer the greater the risk list. Nitrogen should be preceded by the multi-die quenching, tempering, tempering temperature should be at least higher than the nitriding temperature of 50 ℃. The ammonia in nitrogen or 510 ℃ 480 ℃, 75% hydrogen +25% nitrogen atmosphere a mixture of ion nitriding, the nitrided layer surface hardness of about 1100HV0.2. Ion nitriding process usually recommended because it can control the nitrogen potential, to avoid the formation of hot white mold adverse nitride layer. Of course, the strict control of gas nitriding can also be satisfied with the results. ASSAB 8402 can also be controlled atmosphere furnace or in a salt bath furnace for carbonitriding. After carbonitriding surface hardness of up to 900-1000HV0.2. 
 Nitriding depth: total depth of hot die nitriding suggest no more than 0.3mm. ASSAB 8402 can also be annealed nitrogen-based, but the nitriding depth and hardness will decrease. 

 8402 EDM tool steel imports 
 Die by the carbonation state after EDM, machining methods should be taken (such as grinding or Whetstone) remove the surface layer of white sparks, and then add a tempering, tempering temperature lower than the previous tempering temperature 25 ℃. 

 8402 imported mold steel welding process: 
 If the mold and then the welding process, proper attention to the mold preheating, welding area preparation, electrode selection and welding procedures and other factors, will have to obtain a good welding effect. 

 8402 imported die steel hard chrome plating: 
 Die hard chrome plating, you must temper 4 hours at 180 ℃ in order to avoid hydrogen embrittlement. 

 8402 Dermatoglyphics imported mold steel can be made: 
 8402 steel particularly suitable for production of photographic etching striae, its excellent homogeneity and low sulfur content control to ensure precise symmetry striae made. 

 8402 imports of polished steel mold: 
 State ASSAB 8402 quenched and tempered steel with excellent polishing performance. After the mold can be used by the grinding of alumina or diamond paste for polishing. Typical procedure: ① with coarse grinding wheel to the 180 320 number or size Whetstone; ② finely ground powder with sandpaper or grinding to 400-800 grain size number; ③ with 15 (15 micron particle size) diamond polishing paste; ④ with 3 No. (3 micron particle size) diamond paste polishing, polishing tools: cork or fiber products; ⑤ If a high surface finish requirements, can be 1 (1 micron particle size) diamond paste polishing, polishing tools: fiber light polishing pad. 

 Distribution of the Japanese company Hitachi (HITACHI) die steel, Japanese Datong (DAIDO) die steel, Sweden Assab (ASSAB) die steel, German Sa Site (SAARS TAHL) die steel, Austria Bluff (BOHLER) die steel, U.S. Fen cola (ALCOA) die steel, hot die casting tool steels, cold work tool steel, high-speed tool steel and mold steel of high quality imported special tool steel, copper sales of Japanese treasures, forged copper, electrical copper, beryllium copper, copper, aluminum imports, the introduction of large-scale milling and processing equipment cleaners board services, vacuum heat treatment services. Welcome to the new and old customers call us!