High-strength steel plate with yield strength 1,000 MPa and production method thereof
A yield strength and toughness steel plate technology, applied in the field of high-strength and tough steel plate production, can solve the problems of lack of scientific control of original billet quality, limitation of steel composition and production conditions, difficulty of ultra-high-strength steel plate, etc. Large specification coverage and good water flow stability
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[0036] Example 1
[0037] Perform hot metal pretreatment, converter smelting, and LF+RH refining according to the ingredients shown in Table 1. Under the action of electromagnetic stirring (396A, 380A, 5Hz), cast into a 230mm thick continuous casting billet. Heat the continuous casting slab to 1180℃, hold for 180min, and carry out the first stage rolling in the rough rolling mill. The start rolling temperature is 1120℃. When the thickness of the rolled piece is 130mm, it will swing next to the finishing mill until the temperature reaches 900℃. Carry out the second stage of rolling. The final rolling temperature is 866°C. The thickness of the finished steel plate is 50mm. After rolling, continue to relax and wait for 11 seconds to directly quench the steel plate, and quickly cool to 400°C at a rate of 12°C / s. After rolling off the line, the stack is slowly cooled to room temperature. The tempering temperature of the steel plate is 500℃, and the holding time is 150min.
Example Embodiment
[0038] Example 2
[0039] The implementation is as in Example 1, wherein the electromagnetic stirring parameters are: 367A, 349A, 5 Hz. The thickness of the casting slab is 200mm. The continuous casting slab is heated to 1150°C and kept for 200min. The opening temperature of the first stage is 1130°C, and the warming thickness is 90mm. The second-stage start rolling temperature is 923°C, the final rolling temperature is 885°C, and the thickness of the finished steel sheet is 30mm. After the rolling is finished, the steel plate is directly quenched after being relaxed for 15 seconds. The cooling rate of the steel plate is 20℃ / s, and the final cooling temperature is 380℃. The tempering temperature is 550℃ and the holding time is 90min.
Example Embodiment
[0040] Example 3
[0041] The implementation is as in Example 1, wherein the electromagnetic stirring parameters are: 387A, 369A, 5 Hz. The thickness of the continuous casting slab is 230mm, the continuous casting slab is heated to 1180℃, and the holding time is 150min. The opening temperature of the first stage is 1125℃, the thickness of the waiting temperature is 110mm, the opening temperature of the second stage is 905℃, and the final rolling temperature is 871℃. The thickness of the steel plate is 40mm. After the rolling is finished, the steel plate is directly quenched after being relaxed for 17 seconds. The cooling rate of the steel plate is 16°C / s, and the final cooling temperature is 385°C. The tempering temperature is 500℃, and the holding time is 120min.
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