Manufacturing method of low-density, high-strength and high-toughness hot-rolled steel plate

A high-strength, high-toughness, hot-rolled steel plate technology is applied in the field of manufacturing Fe-Mn-Al-C austenitic low-density steel plates, which can solve the problems of large impact on steel plate performance, large impact on steel ingot quality, and poor fluidity of molten steel. Achieve the effect of not easy electrochemical corrosion, good corrosion resistance, and reduce the difficulty of milling and grinding

Pending Publication Date: 2022-06-24
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In large-scale industrial production, the production of Fe-Mn-Al-C austenitic low-density steel plate is mainly reflected in the following aspects: 1) Precise control of alloying elements, large-scale production of low-density steel is involved in steelmaking A series of production operations of molten iron decarburization, molten steel deoxidation, alloying, and degassing, non-laboratory simple "alloy ratio-melting-casting" process, the precise control of Al content in the steelmaking process is difficult, and its metal is active Mold strength is easy to wear and tear, and the Al content in molten steel is closely related to the selection of steelmaking sl

Method used

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  • Manufacturing method of low-density, high-strength and high-toughness hot-rolled steel plate
  • Manufacturing method of low-density, high-strength and high-toughness hot-rolled steel plate
  • Manufacturing method of low-density, high-strength and high-toughness hot-rolled steel plate

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Experimental program
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Effect test

Embodiment 1

[0041] This embodiment is a low-density, high-strength, and high-toughness steel plate with a thickness of 12 mm and a plate width of 2000 mm.

[0042] Process path: steelmaking - billet heating - descaling - billet rolling - slow cooling - intermediate billet solution treatment - intermediate billet surface milling - inspection - storage; intermediate billet is heated again - descaling - rolling ( Finished product rolling) - hot straightening - ACC cooling - straightening - finishing - appearance inspection - sampling - physical and chemical inspection - judgment - storage.

[0043] 1. Steelmaking

[0044] Electric furnace smelting selects special scrap steel materials and pig iron materials, and strictly controls the residual elements in the raw materials into the furnace. The molten steel meets the end point carbon 0.05-0.10%, phosphorus ≤ 0.005%, and the temperature is ≥ 1620 ℃. When tapping, aluminum is used along with the molten steel flow. The block is pre-deoxidized, ...

Embodiment 2

[0053] This embodiment is a low-density, high-strength, and high-toughness steel plate with a thickness of 20 mm and a plate width of 1600 mm.

[0054] Process path: steel making - billet heating - descaling - billet rolling - slow cooling - intermediate billet solution treatment - intermediate billet surface milling - inspection - storage; intermediate billet is heated again - descaling - rolling ( Finished product rolling) - hot straightening - ACC cooling - straightening - finishing - appearance inspection - sampling - physical and chemical inspection - judgment - storage.

[0055] 1. Steelmaking

[0056]Electric furnace smelting selects special scrap steel materials and pig iron materials, and strictly controls the residual elements in the raw materials into the furnace. The molten steel meets the end point carbon 0.05-0.10%, phosphorus ≤ 0.005%, and the temperature is ≥ 1620 ℃. When tapping, aluminum is used along with the molten steel flow. The block is pre-deoxidized, ...

Embodiment 3

[0065] This embodiment is a low-density, high-strength, and high-toughness steel plate with a thickness of 60 mm and a plate width of 2500 mm.

[0066] Process path: steelmaking - billet heating - descaling - billet rolling - slow cooling - intermediate billet solution treatment - intermediate billet surface milling - inspection - storage; intermediate billet is heated again - descaling - rolling ( Finished product rolling) - hot straightening - slow cooling - finishing - appearance inspection - sampling - physical and chemical inspection - judgment - storage.

[0067] 1. Steelmaking

[0068] Electric furnace smelting selects special scrap steel materials and pig iron materials, and strictly controls the residual elements in the raw materials into the furnace. The molten steel meets the end point carbon 0.05-0.10%, phosphorus ≤ 0.005%, and the temperature is ≥ 1620 ℃. When tapping, aluminum is used along with the molten steel flow. The block is pre-deoxidized, and the less re...

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Abstract

The invention relates to a manufacturing method of a low-density, high-strength and high-toughness hot-rolled steel plate, the produced steel plate is a Fe-Mn-Al-C austenite low-density steel plate, the density of the steel plate is 6.75-7.05 g/cm < 3 >, and the material lightweight is remarkable. The yield strength of the steel plate is larger than or equal to 800 MPa, the tensile strength of the steel plate is larger than or equal to 900 MPa, the low-temperature impact toughness of the steel plate is kept at a high level while high strength is guaranteed, and the-40 DEG C V-type impact is larger than or equal to 50 J; the steel plate is excellent in machining performance, the material elongation is larger than or equal to 30%, cold bending meets D = 2a and 180 degrees (D represents the bending center diameter, and a represents the steel plate thickness), the surface quality is high, and internal flaw detection meets the requirement that the single defect equivalent flat-bottom hole diameter is smaller than or equal to phi 2 mm and is higher than the NB/T 47013.3-2015 forging ultrasonic detection I-level requirement. The high-strength and high-toughness steel plate is obtained by taking the steel ingot as a material and through an improved heating, multi-process rolling and rolled steel plate cooling mode, and industrial production is realized.

Description

technical field [0001] The present application relates to a method for manufacturing a low-density hot-rolled steel sheet, and in particular, to a method for manufacturing a Fe-Mn-Al-C series austenitic low-density steel sheet. Background technique [0002] Weight reduction is a problem faced in the current manufacturing process of all vehicles or special equipment. For the weight reduction of steel materials that are widely used, relevant research is currently carried out at home and abroad. The main direction is to add a certain content of Al, Mn, C Elements to reduce the density of steel materials. This type of steel is generally called low-density steel or light-weight steel. The degree of density reduction depends on the addition of Al, Mn, and C-type light elements. Density has the greatest effect, and the density of steel can be reduced by 0.101g / cm for every 1% content added. 3 . According to different phase compositions, Fe-Mn-Al-C type low-density steels include ...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C21C7/06C21C7/10
CPCC22C33/04C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C21C7/06C21C7/10
Inventor 黄军白云李经涛林涛吴建鹏李晨潇侯美伶罗小云高坤宁康康韩雷王小双
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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