Full-fiber large trolley type resistance furnace is mainly used for heat treatment of large and medium-sized metal or alloy parts at rated temperature. The electric furnace shell is welded with steel plate and section steel, and the trolley is welded with section steel and section steel. The ventilator is composed of the blower and the air guide plate. The drum wind power motor has an electrical linkage with the heating element. Only when the blower is connected can the heating element be energized.
Trolley resistance furnace
The common defects of high cycle quenching include quenching crack, soft spot and peeling. High cycle quenching should not be heated inhomogeneous and produce local area of overheating phenomenon, such as the workpiece acute Angle, keyway parts, holes around are very easy to cause overheating, and lead to the occurrence of quenching crack, the above situation can be filled with copper to reduce the possibility of quenching crack. In addition, the high frequency wave quenching workpiece in the quenching process is not uniform, will cause the workpiece surface hardness low defect, known as the soft point, this phenomenon is due to the high frequency wave quenching temperature is not uniform, water hole block or the size and number of holes improper. The third kind of loss is the phenomenon of surface peeling. The main reason is that the hardness of the section changes greatly or the hardened layer is too shallow. Therefore, the method of preheating is often used to deepen the hardened layer, which can effectively prevent the peeling phenomenon.
All fiber trolley resistance furnace
The influence of high temperature tempering on the residual austenite in the carburized layer of 20Cr2Ni4A steel was analyzed from two aspects: high temperature tempering times and high temperature tempering time. As the retained austenite in the carburized layer and high carbon quenched martensite are metastable phase, under the condition of high temperature tempering, there must be proeutectoid carbide precipitation from the retained austenite and martensite, with the increase of tempering times, can reduce the residual austenite in the carburized layer of body, thus get more stable in the subsequent the quenching process of carbide and martensite structure, reduce the residual austenite volume, improve the surface hardness of carburizing layer.
Design standard: designed according to the requirements of military standard jb6206-92, reaching the a-level standard; It conforms to the national standards of GB10067.1, GB10067.4, GB10066.1, GB10066.4, GB5959.1 and GB5959.4. The product has the leading level.
Why can't stainless steel be tempered between 500℃ and 650℃? If most of the stainless steel after solution treatment, in the long time the temperature between 475 ℃ to 500 ℃, can produce the phenomenon of hardness and brittleness surged, this is called a 475 ℃ embrittlement, the main reason there are various, including phase decomposition, on the grain boundary precipitation of chromium carbides and Fe - Cr compounds formation, etc., the real temperature toughness, and corrosion resistance is poor, also hold the heat treatment of stainless steel should avoid often time temperature in the temperature range. In addition, in the 600℃ to 700℃ between the long-term temperature, will produce s phase precipitation, the s phase is fe-cr intermetallic compounds, not only the texture is hard and brittle, but also will be a large number of steel internal chromium element depletion, so that the corrosion resistance and toughness of stainless steel are reduced.
On 2018-08-08 11:45:46
