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A kind of production method of super high-strength steel plate

An ultra-high-strength, steel plate technology, applied in the field of steelmaking, can solve the problems of no mature process and production method for mass production of ultra-high-strength wide and thick plates, poor steel plate plasticity and toughness, and high production costs, so as to achieve simple composition design and increase strength And plasticity, improve the effect of welding performance

Active Publication Date: 2015-08-19
HUNAN VALIN XIANGTAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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 existing problems in the production of high-strength steel plates in the prior art are: a. 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. High cost; b. 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%; c. 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 ; d. At present, there is no mature process and production method for mass production of ultra-high-strength wide and thick plates above 1200Mpa

Method used

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  • A kind of production method of super high-strength steel plate
  • A kind of production method of super high-strength steel plate
  • A kind of production method of super high-strength steel plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The molten iron is pretreated before entering the furnace. After the treatment, the sulfur content of the molten iron is S≤0.010%, and the temperature is ≥1250°C. The slag must be 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 of not less than 250m, and make appropriate adjustments depending on the amount of charge, the end point C, and the change in the oxidation of molten steel. The molten steel is then transported to the LF refining furnace for refining operations.

[0035] LF refining performs white slag making and...

Embodiment 2

[0041] The molten iron is pretreated before entering the furnace. After the treatment, the sulfur content of the molten iron is S≤0.010%, and the temperature is ≥1250°C. The slag must be 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 of not less than 250m, and make appropriate adjustments depending on the amount of charge, the end point C, and the change in the oxidation of molten steel. The molten steel is then transported to the LF refining furnace for refining operations.

[0042] LF refining performs white slag making and...

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Abstract

A method for producing an ultrahigh strength steel plate includes: steelmaking, refining, continuous casting, heating, rolling, cooling and thermal treatment. The steel comprises the follow components by mass: 0.18-0.20 of C, 0.35-0.42 of Si, 1.30-1.40 of Mn, less than or equal to 0.015 of P, less than or equal to 0.010 of S, 0.03-0.06 of Al, 0.02-0.03 of Nb, 0.05-0.06 of V, 0.035-0.045 of Ti, 0.25-0.35 of Mo and 0.0017-0.0022 of B. The steel plate is concise in component design and does not contain a large number of alloying elements, and production cost of the ultrahigh strength steel plate is reduced; Ti is added in the steel plate, so that the welding performance of the steel plate is improved; after Q+P treatment on the steel plate, the tissue of the steel plate contains superfine lath martensite, nanoscale plate retained austenite and deposited composite carbide, and the comprehensive performance of steel plate strength and plasticity is superior to double-phase steel, transformation-induced plasticity (TRIP) steel and common martensitic steel; the steel plate is good in shape after quenched through a roller type quenching machine; and the method is simple in process, easy to achieve, and capable of solving the puzzle that ultrahigh strength steel plates cannot be produced through traditional quenching and tempering, and volume production of 1100MPa level ultrahigh strength steel plates can be achieved.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21D8/02C21D1/18
Inventor 杨云清曹志强刘建兵杨俊雷辉李玉路华浩高擎
Owner HUNAN VALIN XIANGTAN IRON & STEEL CO LTD