Japanese flame hardened tool steel developments

Half of 1960, automobile production plant buffers and other large stamping die quenching, using only part of the cutting edge flame quenching method. Use Table 1 A, B, and other tool steel.
Flame quenching usually oxygen acetylene flame tip distance from the cutting edge along the cutting edge a few mm from the heated blade tip is hot, so many low hardness of retained austenite. Through the non-heated part of the heat conduction cooling, but the low hardenability tool material under the circumstances, water-cooled. Therefore, as the flame hardened steel requirements are as follows: ⑴ a wide quenching temperature, quenching of high hardness; ⑵ difficult to generate residual austenite; ⑶ have the proper hardenability; ⑷ many cases where the welding repair, so good weldability ; ⑸ both cheap and there is mold material characteristics.
The typical Japanese flame hardened steel steel: Japan Datong GO5, Japan Hitachi HMD1, HMD5, Aichi, Japan Steel's SX105V, SX4 and so on.
Hong Chao(DongGuan) sales made over the flame hardened steel CH-1(7CrSiMnMoV), the performance is close to the flame hardened tool steel imports, the price advantage.
Table 1 flame hardened tool steel chemical composition (wt)%

① get 64HRC hardness than the quenching temperature range.
Table 1 CF steel flame hardened tool steel as developed. Composition depends on the amount of carbon in the highest quenching hardness, but must be more than hardening 64HRC maximum hardness, carbon content of 0.70% when it is not a problem. Quenching temperature of silicon to expand the scope of the residual austenite is therefore less effective in flame hardened steel elements. In order to maintain the hardenability added manganese, chromium added to maintain wear resistance and hardenability, but the quenching temperature becomes higher. To add hardenability of molybdenum, but the price is high. Add vanadium to grain refinement. From the above reasons into account, DE steel flame hardened steel, as appropriate, but the curved shape of the flame quenching so wide (flat flame hardening) of the C steel is suitable. F steel containing 8% Cr, C / Cr ratio, a relatively low temperature from 900 ℃ quenching. Flame hardening of steel is taken into account the wear resistance of the mold. C, D then steel for steel plate with thin casting mold, the automobile production plant to use.

More information
Please direct Hong Chao(DongGuan) Mould & Technology Co., Ltd. service contact (hotline 86 0769-82621066 / 82621088, the National Service Hotline :400-699-1286) for more on Japanese developments in flame hardened steel and high quality mould steel (Japan Daido tool steel DC53_NAK80 Sweden ASSAB mould steel S136_VIKING, Germany Groditz mould steel, Japan Fuji high-speed steel, Japan's Hitachi mould steel, etc.) the selection, application, heat treatment and inventory and other related information.
Source: Hong Chao(DongGuan) Mould & Technology Co., Ltd. Technology Center
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