Patent Daido Steel Co., Ltd. Steel -NAK80 of the P20 steel. Factory hardness can reach HRC37-43. Have a good polishing and carving of performance, EDM Good Use in mirror-polished mold, and dust, TV filter plate, cosmetics boxes, precision mold processing wrinkles, office automation equipment, automotive EDM mold parts, thin sheet thickness of not more than 2MM, efficient blanking die, punch die and pressure die carrier, scissors, inlaid blades, woodworking blades, wear-resistant thread rolling dies and sliders, cold heading dies, hot solid resin molding, deep drawing molding, cold extrusion dies. Chinese name NAK80 development company Daido Steel Co., Ltd. types of steel products patented P20 steel punch role overload and pressure die mold hardness HRC37-43 Features Contents 1 2 3 Cracking the chemical composition of the high temperature properties 4 5 6 purpose processing methods? ? machining solution treatment precipitation hardening of welding performance when grinding polishing:?????? grinding and polishing conditions Etching Processing:? EDM EDM conditions cryogenic treatment of 7 8 9 nitriding treatment? Cracking Performance Comparison NAK801 edit NAK80 mold steel is steel we have been promising, NAK80 mold steel heat treatment cracking factors generally can be grouped into several aspects of the mold structure, mold materials and heat treatment. Through the role of these factors in the heat stress, prompting cracks. To prevent heat cracking, it must take full account of all relevant factors. 2 Features editor ● No heat, excellent optical polishing, cutting resistance, corrosion spend Good ● pure steel vacuum degassing refining treatment. ● ball annealing softening treatment, good machinability. ● strengthening elements vanadium, molybdenum adding special, extremely excellent abrasion resistance. 3 Chemical Composition edit elements C Si Ni Mn Mo Cu AI Cr Fe content of 0.15 0.3 3.0 1.5 0.3 1.0 1.0 0.3 Other uses are iron four editors generally used in mirror-polished mold, and dust, TV filter plate, cosmetics boxes, precision wrinkles mold processing, office automation equipment, automotive parts EDM die. Transparent or require finish products, such as transparent mold articles on product family, cars, cameras, computers and so on. ● Sheet thickness of not more than 2MM, efficient blanking die, punch die and pressure die carrier. ● scissors, inlaid blades, woodworking blade. Mold material inventory mold material inventory (4) ● thread rolling die and wear slider. ● Cold Heading Die, thermosetting resin molding. ● deep drawing molding, cold extrusion die 5 high temperature mechanical properties of editing performance test temperature (℃) 100 200 300 Tensile strength (Ksi) - 145 143 section shrinkage (%) - 38.5 40.1 Elongation - 15.9 16.0 Impact Value 1.8 3.6 3.5 hardness (HV) 395 375 360 6 processing methods NAK80 edit machining cutting tools with high hardness, cutting resistance than other steels, it is recommended to use high-speed steel -M2 (SKH9) or -P40 cemented carbide tools. When drilling drilling, the drilling larger diameter, cutting speed to be smaller. If the spiral groove is smaller than the standard, shorter length, the tool will reduce the risk of fracture. Milling feed rate to 0.06m / l as the standard, if the feed is too big, it will reduce tool life. Planer processing cemented carbide planer recommended for cemented carbide planer, bevel tool after make about 8 ℃, the following pre-clearance angle 10 ℃, so that better results can be obtained; NAK80 for precipitation hardening pre-hardened steel, hardness about 40HRC, no longer heat treatment can be used directly. Solution treatment which is designed to make the alloy composition uniformly dissolved in austenite. Because not hardened, so do not need fast cooling rate, it will not have great residual stress. Precipitation hardening treatment was heated and held for some time between precipitation, nickel, aluminum, copper and other metal compound, the material is hardened. Because they do not have to rely on hardened, it does not matter the quality of the effect of the problem in general steel material, even thick steel material is also available very uniform hardness distribution of the section. Welding performance weld and heat affected zone will not harden, slightly lower than the hardness of the base material (already precipitation hardening), but after welding lend 500 ℃ * 5 hours to restore hardness precipitation hardening. Grinding of NAK80 than other steel mirror the requirements easier to achieve because of the following two points: (1) due to the double melting and refining leaving the pinhole to a minimum. (2) Because it is a low-carbon precipitation hardening steel, and having fine and uniform microstructure. Prior to grinding and polishing, the surface must first achieve the desired flatness, straightness, and the correct shape and size and so on. (A) use the full range of abrasive materials, must, in accordance with the requirement to use from coarse to fine, can not skip a grade grinding. (B) grinding and polishing every direction should be perpendicular to the traces left by the previous direction. (C) unless the previous level grinding traces left completely removed and bright, not use sandpaper to the next level, otherwise pinholes may occur after polishing. (D) the use of abrasive particles to be uniform. (E) the use of smaller particle size than the abrasive to remove pinhole pinhole. (F) use of more flexible workpiece grinding or polishing tool. (G) If a whetstone, should choose soft, but first made you want to fit the shape of the grinding surface shape. (H) If the work be suspended, while semi-finished piece must be placed for some time, its surface must be clean and stored in a dry place where the polishing process: (1) the purpose of polishing the surface with a bright and shiny, not the removal of the needle hole or polished surface. (2) polishing should be fast and light, the surface roughness before polishing that must be minimized. (3) pinhole and other issues on the mirror treatment, usually due to incorrect grinding and polishing process caused, should pay more attention. General conditions of grinding and polishing grinding and polishing sequence NAK80 follows: whetstone grinding * (from coarse → fine: # 46- # 80- # 120- # 150- # 220- # 320- # 400) → sandpaper grinding (# 220- # 280- # 320- # 400- # 600- # 800- # 1000- # 1200- # 1500) → diamond paste (15μm-9μm-6μm-3μm-1μm) * Avoid processed and then rasp file, due to make the surface rough. Etching process: excellent corrosion spent processing performance, better than NAK55. NAK80 eclipse flowers die steel corrosion methods and other methods currently used in the same flower, the following is an example of an eclipse took condition. Etching solution: FeCL3 + HNO3 (ferric nitrate +) Temperature: 42 ℃ Process: Immersion time: 10 "30" 15 "= HND6 discharge machining of EDM surface will not harden, does not produce a hardened layer of fine smooth machined surface. very beautiful, sometimes instead of pitting spent processing (wire cutting surface and vice versa). Conditions of use EDM models DLAX250 DE 150S machining current 2A-4.5A processing 200mmHg processing depth 20mm hydraulic machining voltage 80-100V copper electrode, an electrode consumption % following seven cryogenic treatment editor for obtaining the highest hardness and dimensional stability, mold immediately after quenching cryogenic -70 to -80 ℃, maintained for 3-4 hours, then tempered by deep cryogenic treatment of tool or mold hardness higher than conventional heat treatment hardness 1-3HRC. shape complexity and changes in the larger part size, cryogenic treatment in danger of cracking 8 nitriding production editing mold or workpiece after nitriding treatment, the surface layer has a high hardness and a certain The corrosion resistance of the hardened layer organization. 9 Performance Comparison edit NAK80 NAK55 having various characteristics in addition to the outside, as well as the following features. 1, mirror polishing property is extremely good. 2, EDM surface detail, appearance, and therefore, can be substituted pear Paper Flowers comparison purposes eclipse:. NAK80 compared with NAK55, pay attention to the following properties suitable for the occasion: a transparent mirror abrasive products such importance 2, attention EDM surface NAK80