Production method for transformation induced plasticity steels by hot rolling
A technology of phase transformation induced plasticity and production method, which is applied in the production field of hot rolled phase transformation induced plasticity steel, can solve the problems of low coiling temperature and high cooling rate, achieve the effect of high volume fraction of retained austenite and simplify the process flow
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Embodiment 1
[0020] The chemical composition of raw steel is: 0.2%C, 1.67%Mn, 0.10%Si, 1.45%Al, 0.17%Mo, 0.02%Nb, and the balance is Fe. Heat a slab with a thickness of 230mm to 1300°C in the furnace and hold it for 160min, then cool it to 1180°C at a speed of 15°C / s for 5 passes of rough rolling. After rough rolling, the slab temperature is 1050°C and the thickness is 50mm. Then, cooling to 970°C at a speed of 10°C / s for 7 passes of finish rolling, the interval between each pass is less than 3 seconds, the deformation of each pass is 10%-50%, and the total deformation of finish rolling is 90%, the temperature after finish rolling is 900°C. Subsequently, it was curled at 20°C / s to 600°C and air-cooled to room temperature, and the obtained tissue was as follows: figure 2 shown. image 3 is the SEM photo of the steel, Figure 4 is the X-ray diffraction pattern of the steel. After calculation, the volume fraction of retained austenite in the structure at this time is 8.9%. Tensile test...
Embodiment 2
[0022] The chemical composition of raw steel is the same as in Example 1. Heat a slab with a thickness of 230mm to 1250°C in the furnace and hold it for 180min, then cool it to 1150°C at a speed of 10°C / s for 5 passes of rough rolling. After rough rolling, the temperature of the slab is 1000°C and the thickness is 50mm. Then, cooling to 950°C at a speed of 20°C / s for 7 passes of finish rolling, the interval between each pass is less than 3 seconds, the total deformation of finish rolling is 95%, and the temperature after finish rolling is 850°C. Subsequently, it was curled at 20°C / s to 620°C and air-cooled to room temperature, and the obtained tissue was as follows: Figure 5 shown. X-ray measurement shows that the volume fraction of retained austenite in the structure is 9.2%.
Embodiment 3
[0024] The chemical composition of the raw steel is: 0.18% C, 1.50% Mn, 0.10% Si, 1.67% Al, and the balance is Fe. Heat the slab with a thickness of 230mm to 1200°C for 180min, then lower it to 1150°C at a speed of 10°C / s for rough rolling, the deformation of each rough rolling pass is 20%-50%, and the total deformation is 80% , the temperature after rough rolling is 980°C; and then cooling to 920°C at 15°C / s for 7 passes of finish rolling, the interval between each pass is less than 2 seconds, the total deformation of finish rolling is 90%, and the temperature after finish rolling is 820°C; then cooling at 20°C / s to 650°C for crimping and air cooling to room temperature, its organization is as follows Image 6 shown. At this time, the volume fraction of retained austenite in the steel is 8.5%.
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Abstract
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