A kind of heat treatment method of low carbon structural steel for cold extrusion
A heat treatment method and carbon structural steel technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of poor hardness uniformity and high hardness, and achieve the effect of reducing hardness and improving uniformity
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Embodiment 1
[0038] The present embodiment provides a heat treatment process of low-carbon structural steel for cold extrusion, comprising the following steps:
[0039] The 10-steel blanks are placed in the trolley-type annealing furnace, and multiple blanks are stacked on the material seat in the furnace layer by layer. Each layer is separated by a pad iron, and the distance between any two adjacent blanks in the same layer It is 50mm, and the protective gas nitrogen is introduced into the furnace, and the furnace temperature is raised to 740°C, the heating rate is 70°C / h, and the temperature is kept at this temperature for 4h; And kept at this temperature for 4 hours; the blank after the heat preservation treatment was cooled, cooled to 630 °C at a speed of 30 °C / h, and continued to be cooled to 550 °C at a speed of 50 °C / h. The hardness is 111-120HBW, the hardness uniformity is ≤10HBW, and the metallographic structure is as follows figure 2 The ferrite + spherical pearlite structure s...
Embodiment 2
[0044] The present embodiment provides a heat treatment process of low-carbon structural steel for cold extrusion, comprising the following steps:
[0045] Place 10 steel (ie, No. 10 steel) blanks in the trolley-type annealing furnace, and stack multiple blanks on the material seat in the furnace layer by layer. The distance between the blanks is 50mm, and the protective gas nitrogen is introduced into the furnace. The blank is a round bar steel. The furnace temperature is raised to 780°C, the heating rate is 70°C / h, and the temperature is kept for 4h; Cool down to 730°C at a rate of 30°C / h, and keep at this temperature for 4 hours; the blank after the heat preservation treatment is cooled down to 630°C at a rate of 30°C / h, and continues to cool at a rate of 50°C / h Released from the oven at 550°C, and air-cooled to room temperature after release. The hardness is 115-125HBW, the hardness uniformity is less than or equal to 10HBW, the metallographic structure is ferrite + spher...
Embodiment 3
[0047] The 10-steel blanks are placed in the trolley-type annealing furnace, and multiple blanks are stacked on the material seat in the furnace layer by layer. Each layer is separated by a pad iron, and the distance between any two adjacent blanks in the same layer The furnace is 80mm, and the protective gas nitrogen is introduced into the furnace. The blank is a round bar steel. The furnace temperature is raised to 760°C, and the heating rate is 70°C / h and kept at this temperature for 3h; then at a rate of 20°C / h Cool down to 710°C, and keep at this temperature for 5 hours; after the heat preservation treatment, the blank is cooled to 630°C at a rate of 30°C / h, and continues to cool to 550°C at a rate of 50°C / h. Then air-cooled to room temperature. The hardness is 113-123HBW, the hardness uniformity is ≤10HBW, the metallographic structure is ferrite + spherical pearlite structure, and the steel can be processed by cold extrusion with large deformation.
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