Key points of heat resistant steel bar section producing

Generally, heat resistant steel bar section includes round steel, square steel, flat steel, six Angle steel, eight Angle stell and a few special steel. The productive process of heat resistant steel bar section is a little complex, including ingot cogging, heating, rolling timber and heat treatment, surface processing, etc.

The thermal conductivity of the low carbon steel is better than that of the alloy steel, so the ranges of loading furnace temperature, heating rate and ultimate heating temperature of low carbon steel are wide. On the other hand, the production standard of alloy steel is strict and there should be a certain heat preservation time when it is heated to the phase transition temperature. Usually, low carbon steel has better thermoplastic, smaller deformation resistance and wider range of hot rolling temperature. For this, the low carbon steel will be rolled in large deformation generally. Differently from low carbon steel, alloy steel has ruleless hot rolling cut and bigger deformation resistance, leading to difficut bite into the material. As a result, the alloy steel should be rolled in small deformation to ensure uniform deformation, avoiding stress crack occuring.

The thermal conductivity of heat resistant Ferritic stainless steel is poor. Usually, the coefficient of thermal conductivity of this kind of steel is only half of that of general carbon steel and the thermal expansion coefficient is big, which easily leads to heat stress. For the reason, it requires slow heating and enough soaking time when heating. So, it needs appropriate finishing temperature. And the surface defect of steel and steel billet should be eliminated with mechanical method. In order to avoid grinding crack, wheel grinding is forbided. The thermal conductivity of heat resistant Austenitic stainless steel is low and there is no organizational stress. Therefore, the temperature of ingot loading furnace is unlimited. Austenitic steel has good ductility at a high temperatur, but its thermal deformation resistance can be very large. With temperature decreasing, the resistance to deformation increases greatly. So, the finishing temperature and deformation degree should be control properly. The thermal conductivity of heat resistant Martensitic stainless steel is poor and the thermal coefficient is a litte higher than that of Austenitic steel. Besides, the organization stress and thermal stress is large and ingot needs hot furnace charging. Before surface clean, the cold steel ingot needs stress relieving.

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