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NAK55 [] [Hongyuan Hongyuan Hongyuan] [] NAK55 NAK55 steel mold steel Japan Datong NAK55] [Hongyuan Hongyuan] [NAK55 pre-hardened material NAK55 clinker [] [Hongyuan Hongyuan Hongyuan] [price] NAK55 NAK55 heat treatment of materials] [Hongyuan Hongyuan NAK55 hard material [] [Hongyuan] NAK55 NAK55 steel rod NAK55 basic information: Model No.︰ NAK55 Brand Name︰ Country of Origin ︰ Japan Datong Steel Factory state ︰ HRC37-43 quite Buderus Buderus standard ︰ - quite Bluff Bohler standard ︰ - Hitachi hitachi fairly standard ︰ - quite a standard ︰ ASSAB Assab - toughness abrasion ★★★ ☆☆ ︰ ︰ ︰ workability ★★ ★★★ ☆☆ ★ ☆☆ polishing ︰ ★★★★ ☆ features: Daido Steel Co., Ltd. is a patented steel -NAK55 pre-hardened steel, without any heat treatment characteristics: without heat treatment, polishing excellent machinability, Etched good use : Suitable for mirror polishing of pre-hardened steel. NAK55 mainly used for mirror polishing mold, TV filter plate, cosmetics boxes, such as mold, precision mold processing wrinkles, office automation equipment, automotive parts discharge machining, such as mold. NAK55, high hardness (40HRC) Pre-hardened steel (special smelting age-hardening) Cutting property, loss of good flowers precision mirror mold cameras, music, makeup containers, transparent Enclosures, transparencies and other chemical composition: Element C Cr Mn Si Mo Ni S Al Cu percentage 0.3 0.3 3.0 0.15 0.3 1.5 0.1 1.0 1.0 Physical properties: DAIDO Datong Steel NAK55 physical properties: thermal expansion coefficient of 10 m / (mxk) 20-100 ℃ 20-200 ℃ 20-300 ℃ 11.3 12.5 13.4 DAIDO Datong Steel NAK55 mechanical properties: yield strength HRC hardness kgf / mm2 Tensile strength kgf / mm Elongation%% longitudinal section shrinkage impact value Kgf.m / C㎡ 41HRC 103 (0.2%) 128 15.6 39.8 1.8 -3 factory state pre-hardened high hardness 37-43HRC Features Applications (40HRC) Pre-hardened steel (special smelting age-hardening) Cutting property, loss of good flowers. precision mirror mold. Camera, music, make-up containers, transparent Enclosures, transparent film and other mechanical properties: yield strength hardness HRC 41HRC kgf / m㎡ 103 (0.2%) Tensile strength kgf / mm2 128 Elongation% 15.6% 39.8 Longitudinal section shrinkage impact value Kgf. m / C㎡ 1.8-3