The steel head workpiece is slowly transferred from the heating furnace to the cooling tank, and the temperature of the workpiece entering the water has dropped below the ar3 critical point, resulting in partial decomposition. The steel head workpiece has an incomplete quenching structure, which cannot meet the hardness requirements. Therefore, the cooling liquid for small parts should be fast, and the pre cooling time for large parts should be controlled.
The charging amount of the second workpiece shall be reasonable, and it is better to use 1~2 layers. The overlapping of the workpieces will cause uneven heating, resulting in uneven hardness.
3. The arrangement of workpieces into water shall be kept at a certain distance. If it is too dense, the vapor film near the workpieces will be blocked, resulting in low hardness of the workpieces near the surface.
The quenching can not be completed in one breath after the fourth furnace opening. The furnace should be closed in the middle and re heated according to the degree of furnace temperature decline, so that the hardness of the front and rear workpieces is consistent after quenching.
Heat resistance refers to that stainless steel can still maintain its excellent physical and mechanical properties at high temperature. Influence of carbon: carbon is formed and stabilized in austenitic stainless steel. Elements that define austenite and expand the austenite zone. The ability of carbon to form austenite is about 30 times that of nickel. As a interstitial element, carbon can improve the strength of austenitic stainless steel through solution strengthening. Carbon can also improve the stress and corrosion resistance of austenitic stainless steel in high concentration chloride (such as 42% mgcl2 boiling solution).
At present, the common hacksaw blade is a hand saw blade, which is made of carbon tool steel (t10). The machine saw blade is a high-speed tool steel. It may be seen from the marks on the saw blade that the hand saw blade is easy to break, but the machine saw blade is not easy to break. When grinding the high-speed steel with a grinding wheel, only a spark of dark red can be seen. The edge may change color due to high temperature, but the hardness is not easy to drop, Previously, it was used to grind wooden fancy planer. It is very useful, but it needs a sharpener for opening. Steel letterhead electroplated characters shall be electroplated first. Arc steel letterhead shall be plated with a thick layer of copper on the hand carved type, and then the copper layer shall be stripped. These are the main requirements of the steel word factory. We must operate correctly according to the instructions. Only in this way can we achieve the effective purpose and improve the performance of our products. If you have any questions about the steel word, please contact us at any time.
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