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A kind of production method of super high-strength steel plate
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A production method and ultra-high-strength technology, applied in the field of steelmaking, can solve the problems of mature technology without mass production, poor plasticity and toughness of steel plates, high production costs of steel plates, etc., achieve simple composition design, improve strength and plasticity, and improve welding performance Effect
Active Publication Date: 2015-08-19
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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In the above patents, high content of Mo, Ni, V, Ti, Nb and other precious alloys are added to the composition of the steel plate to ensure the performance of the steel plate and the adaptability of the process, and the production cost is high
[0010] Therefore, the problems existing in the production of high-strength steel plates in the prior art are: high-content precious alloys such as Mo, Ni, V, Ti, and Nb are added to the components of high-strength steel plates to ensure the performance of the steel plate and the adaptability of the process, and the production cost of the steel plate is high. ; When the strength of high-strength steel plate reaches 1000MPa, the plasticity and toughness of the steel plate are poor, and its elongation is less than 10%; the current (Q+T) and TMCP production process can no longer produce high-strength steel plate above 1100MPa to meet the needs of the manufacturing industry; ultra-high strength above 1200Mpa There is currently no mature process for mass production of wide and thick plates
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Embodiment 1
[0033] Example 1: Production process of 1400MPa grade ultra-high strength steel plate. The composition mass percentage of steel is: C=0.23, Si=0.69, Mn=1.46, P=0.011, S=0.0019, Al=0.042, Nb=0.026, V=0.055, Ti=0.043, Mo=0.26, B= 0.0019.
[0034] The main process steps and parameters are as follows:
[0035] The molten iron is pretreated before entering the furnace. After the treatment, the sulfur content of the molten iron is S≤0.010%, the temperature is ≥1250°C, and the slag is cleaned before the molten iron enters the converter. During the converter smelting process, molten iron and steel scrap are added, and the proportion of molten iron and scrap steel is about 85% of molten iron and about 15% of scrap steel. Converter end point control C-T coordinated tapping, P≤0.012%, S≤0.015%; Strictly stop slag tapping, slag thickness ≤50mm, tapping time 4-7min, 1 / 5 of tapping is added with alloy, 2 / 5 of tapping is plus Finish the alloy; after tapping, inject Al line for deoxidation...
Embodiment 2
[0041] Example 2: Production process of 1400MPa grade ultra-high strength steel plate.
[0042] The composition mass percentage of steel is: C=0.24, Si=0.72, Mn=1.49, P=0.012, S=0.0018, Al=0.051, Nb=0.025, V=0.058, Ti=0.04, Mo=0.27, B= 0.002.
[0043] The main process steps and parameters are as follows:
[0044] The molten iron is pretreated before entering the furnace. After the treatment, the sulfur content of the molten iron is S≤0.010%, the temperature is ≥1250°C, and the slag is cleaned before the molten iron enters the converter. During the converter smelting process, molten iron and steel scrap are added, and the proportion of molten iron and scrap steel is about 85% of molten iron and about 15% of scrap steel. Converter end point control C-T coordinated tapping, P≤0.012%, S≤0.015%; Strictly stop slag tapping, slag thickness ≤50mm, tapping time 4-7min, 1 / 5 of tapping is added with alloy, 2 / 5 of tapping is plus Finish the alloy; after tapping, inject Al line for deox...
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Abstract
The invention provides a production method of an ultrahigh-strength steel plate. A process route adopted by the method is converter steelmaking-secondary refining-continuous casting-heating-rolling-accelerated cooling and heat treatment. The production method is characterized in that the steel comprises the following components by weight percent: 0.23-0.26% of C, 0.65-0.75% of Si, 1.40-1.50% of Mn, no more than 0.015% of P, no more than 0.010% of S, 0.03-0.06% of Al, 0.02-0.03% of Nb, 0.055-0.065% of V, 0.035-0.050% of Ti, 0.25-0.35% of Mo and 0.0017-0.0022% of B. The production method has the following advantages: the components of the steel plate are designed concisely and plenty of alloying elements are not added, thus the production cost of the ultrahigh-strength steel plate is lowered; Ti is added to the components of the steel plate, thus the welding property of the steel plate is improved; after the steel plate is subjected to Q+P treatment, the tissues of the steel plate are ultrafine lath martensite+nanoscale lath retained austenite and precipitated complex carbides, and the combination properties of strength and plasticity of the steel plate are superior to the combination properties of dual-phase steel, TRIP steel and common martensitic steel; after the steel plate is quenched by a roller quenching machine, the plate shape is good; and the production method has simple procedure and easily achieved process, is conductive to solving the problem that the ultrahigh-strength steel plate cannot be produced by traditional quenching and tempering, and achieves volume production of the 1400MPa grade ultrahigh-strength steel plate.
Description
technical field [0001] The invention belongs to the steelmaking technology and relates to a production method of an ultra-high-strength steel plate. technical background [0002] Ultra-high-strength steel refers to structural steel whose tensile strength is above 1000MPa, close to or exceeds 2000MPa, total elongation > 10%, and is relatively cheap. The traditional quenching-tempering process cannot meet the requirements of high-strength steel with certain toughness and low cost. At present, the general high-strength steel is basically added alloy elements to make the performance of the steel meet the standard. The high-strength steel obtained in this way is relatively expensive, which is not conducive to energy saving and consumption reduction. In order to reduce production costs and increase economic benefits, it is necessary to continuously conduct experimental research on new processes and new technologies. [0003] Pearlite (non-deformation state) and bainite struct...
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