If the surface finish is different, even if the same heating, the surface of the rough and fine oxide is not the same. For example, in the place where the local defect is cleaned and in the place where it is not cleaned, the condition of the formation of oxide skin is different, which causes the surface of the workpiece to be uneven after pickling.
In addition to the thermal conductivity of the metal, the total heat transfer coefficient depends on other factors. In most cases, the heat dissipation coefficient of the film layer, the rust and the surface condition of the metal. Stainless steel can keep the surface clean, so its heat transfer is better than other metals with higher thermal conductivity.
The technical standard of stainless steel plate Stainless steel plate corrosion resistance, bending processing performance and toughness of the welding part, as well as the stamping processing performance of the welding part of the high strength stainless steel plate and its manufacturing method. Specifically, it contains C: less than 0.02%, N: less than 0.02%, Cr: More than 11% less than 17%, the appropriate content of Si, Mn, P, S, Al, Ni, And meet 12≤Cr Mo 1.5Si≤17, 1≤Ni 30(C N) 0.5(Mn Cu)≤4, Cr 0.5(Ni Cu) 3.3Mo≥16.0, 0.006≤C N≤0.030 stainless steel plate heating to 850 ~ 1250℃, Then the heat treatment is carried out at a cooling rate of more than 1℃/s. This can become a high-strength stainless steel plate containing 12% volume fraction with martensitic structure, high strength, corrosion resistance and bending performance above 730MPa, and excellent toughness in the welding heat affected zone. Using Mo, B, etc., can significantly improve the stamping machining performance of the welding part. Oxygen and gas flame can not cut stainless steel plate because stainless steel is not easy to be oxidized. 5CM thick stainless steel plate to be processed with special cutting tools, such as: (1) Large wattage Laser Cutting machine(laser Cutting machine) (2) hydraulic saw machine(3) grinding disc (4) human hand saw (5)Wire Cutting machine(wire cutting machine). (6) High-pressure water jet cutting (professional water knife cutting: Shanghai Xinwei) (7) plasma arc cutting.
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