What is the heat treatment characteristic of alloy steel castin

  • When alloy steel castings are subjected to thermal treatment, the heating temperature should be slightly higher than that of forged steel parts of the same composition, and the austenitizing heat preservation time should also be properly extended. For steel castings with disordered shapes and large wall thickness difference, it is necessary to consider the cross-sectional effect and casting stress during thermal treatment.

    It is also widely used and suitable for casting various types of alloys. Heat treatment of heat resistant steel castings should be based on reasonable accumulation of layout characteristics to prevent deformation as much as possible. In order to eliminate the influence on the end function of the casting when the as-cast arrangement of the casting is severe, the uniform treatment method should be adopted.

    High temperature oxygen resistance is the main element that resists high mixed corrosion and can improve the thermal strength of heat resistant steel. The resistance of heat-resistant steel to high mixed corrosion is related to its chromium content. Therefore, the chromium content of commonly used heat-resistant steel should not be lower than that of nickel, which is one of the important gold elements in heat-resistant steel.

    In order to obtain pure austenite structure, when other iron and threonines are combined in steel to form meta-table, nickel content must be added. If nickel content is not increased or decreased, bi-directional structure or unstable austenite structure will appear, and phase transformation may occur during cold working. Molybdenum is a refractory metal with a high melting point. It has a good effect on improving the heat strength of heat resistant steel.

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