Material heat treatment process of forging blank parts

Axial parts of material 1 shaft parts of 45 steel is commonly used, high precision of shaft can choose 40 cr, GCr15 bearing steel, spring steel 65 mn, also can choose ductile cast iron; Of high speed and overloaded axis, choose 20 crmnti, 20 mn2b, 20 cr and other low carbon alloy steel or 38 crmoal nitrided steel. 2 axial blank common round bar and forgings; The shaft of the large shaft or complex using casting. After heating forging blank, can make the metal internal fibre evenly distributed along the surface, high tensile, flexural and torsional strength. Axial parts of forging blank before machining, heat treatment all needs to arrange the normalizing or annealing treatment, make steel internal grain refinement, eliminate forging stress and reduce the material hardness, improving machinability. Conditioning is generally arranged in the crude before, half fine car after car, to get good physical and mechanical properties. Surface quenching general arrangement before finishing, so we can correct the local deformation caused by quenching. High precision shaft, after partial quenching or coarse grinding, low temperature aging treatment is also required.