Preparation method of high carbon steel with good cold formability
A technology with good cold formability and high carbon steel, applied in the field of hot-rolled strip steel, can solve the problems of poor cold formability, low spheroidization rate, and many annealing times, so as to achieve good cold formability and increase yield And performance, the effect of short preparation process
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Embodiment 1
[0020] The production of 4.0mm steel strip, the main process flow: hot metal desulfurization→converter blowing→argon blowing→LF furnace refining→continuous casting→soaking furnace→finish rolling→laminar cooling→coiling→slow cooling in coil storage→levelling→ annealing;
[0021] The chemical composition of high carbon steel is designed as: C: 0.70%, Si: 0.38%, Mn: 1.20%, P: 0.010%, S: 0.003%, N: 0.005%, Cr: 0.10%, Als: 0.030, Ti: 0.002%, the rest is Fe and unavoidable impurities;
[0022] The main process parameters are:
[0023] The continuous casting steel temperature is 1500°C, the thickness of the continuous casting slab is 90mm, the temperature of the continuous casting slab is 900°C, the temperature of the furnace is 1130°C, the time of the casting slab in the furnace is 25min, the air-fuel ratio in the furnace is 1.30, the final rolling temperature is 880°C, and the finish rolling The reduction rate in the non-recrystallization zone is 15%, the laminar flow cooling ado...
Embodiment 2
[0026] The production of 2.0mm steel strip, the main process flow: hot metal desulfurization→converter blowing→argon blowing→LF furnace refining→continuous casting→soaking furnace→finish rolling→laminar cooling→coiling→slow cooling in coil warehouse→leveling→ annealing;
[0027] The chemical composition of high carbon steel is designed as: C: 0.50%, Si: 0.15%, Mn: 0.90%, P: 0.012%, S: 0.001%, N: 0.004%, Cr: 0.50%, Als: 0.030, Ti: 0.003%, the rest is Fe and unavoidable impurities;
[0028] The continuous casting temperature is 1520°C, the thickness of the continuous casting slab is 52mm, the temperature of the continuous casting slab is 920°C, the temperature of the furnace is 1280°C, the time of the casting slab in the furnace is 20min, the air-fuel ratio in the furnace is 1.10, the final rolling temperature is 860°C, and the finish rolling temperature is 860°C. The reduction rate in the non-recrystallized zone is 30%, the laminar flow cooling adopts the front stage of rapid ...
Embodiment 3
[0031] The production of 1.5mm steel strip, the main process flow: hot metal desulfurization → converter blowing → argon blowing → LF furnace refining → continuous casting → soaking furnace → finishing rolling → laminar cooling → coiling → slow cooling in coil storage → leveling → annealing;
[0032] The chemical composition of high carbon steel is designed as: C: 0.36%, Si: 0.10%, Mn: 0.60%, P: 0.012%, S: 0.001%, N: 0.004%, Cr: 0.90%, Als: 0.030, Ti: 0.003%, the rest is Fe and unavoidable impurities;
[0033] The continuous casting temperature is 1535°C, the thickness of the continuous casting slab is 50mm, the temperature of the continuous casting slab entering the furnace is 920°C, the temperature of the continuous casting slab is 1250°C, the time of the casting slab in the furnace is 30min, the air-fuel ratio in the furnace is 1.10, the final rolling temperature is 820°C, and the finishing rolling The reduction rate in the non-recrystallized zone is 35%, the laminar flow ...
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