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High-strength steel plate with excellent cold forming property and manufacturing method of high-strength steel plate

A high-strength steel plate and manufacturing method technology, applied in the direction of improving process efficiency, etc., can solve the problems of low production cost and inability to meet the needs of thick steel plates, etc., achieve good cold forming performance, improve cold forming performance, and good welding performance.

Active Publication Date: 2015-03-11
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The patent application No. "201310405935.3" titled "A Method for Producing High Formability Steel Plates Using a Medium Plate Rolling Mill and the Steel Plates Made" is relatively low in overall production cost, but the thickness specification is only limited to within 20mm, which cannot meet the requirements of thickness. Demand for standard steel plates

Method used

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  • High-strength steel plate with excellent cold forming property and manufacturing method of high-strength steel plate
  • High-strength steel plate with excellent cold forming property and manufacturing method of high-strength steel plate
  • High-strength steel plate with excellent cold forming property and manufacturing method of high-strength steel plate

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Experimental program
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Effect test

Embodiment 1

[0058] 185 tons of molten iron is smelted in a converter, heated to a temperature of 1300°C, and then 30 tons of scrap steel is added, and 0.13 tons of aluminum is added for deoxidation and alloying using a single slag process, and the slag is blocked in tapping, and the tapping temperature of the converter is controlled between 1620-1660°C. During the tapping process, the ladle must be bottom-blown with argon, and the molten steel must not be exposed. After the molten steel is smelted in the converter, it is refined outside the LF furnace, adding 4.2 tons of ferromanganese, 0.13 tons of ferro-niobium, 1.24 tons of ferrosilicon, 0.84 tons of ferrochrome and 1.36 tons of ferromolybdenum, and then vacuum degassing in the RH process and adding 0.16 tons of ferro-titanium , the vacuum degree of vacuum degassing is 0.25KPa, and the deep vacuum time is 20min; the molten steel is sent to the casting machine for continuous casting, and the superheat of the molten steel is controlled at...

Embodiment 2

[0061] 185 tons of molten iron is smelted in a converter, heated to a temperature of 1300°C, and then 35 tons of scrap steel are added, and 0.15 tons of aluminum is added for deoxidation and alloying using the single slag process, and the tapping temperature of the converter is controlled between 1620-1660°C. During the tapping process, the ladle must be bottom-blown with argon, and the molten steel must not be exposed. After the molten steel is smelted in a converter, it is refined outside the LF furnace, adding 4.3 tons of ferromanganese, 0.10 tons of ferro-niobium, 0.95 tons of ferrosilicon, 0.71 tons of ferrochrome and 0.76 tons of molybdenum. Iron, followed by vacuum degassing in the RH process and adding 0.19 tons of ferrotitanium, the vacuum degree of vacuum degassing is 0.25KPa, and the deep vacuum time is 20min; the molten steel is sent to the casting machine for continuous casting, and the superheat of the molten steel is controlled at 15-50°C Put the slab into the he...

Embodiment 3

[0064] 185 tons of molten iron is smelted in a converter, heated to a temperature of 1300°C, and then 40 tons of scrap steel is added, and 0.16 tons of aluminum is added for deoxidation and alloying using a single slag process, and the slag is blocked in tapping, and the tapping temperature of the converter is controlled between 1620-1660°C. During the tapping process, the ladle must be bottom-blown with argon, and the molten steel must not be exposed. After the molten steel is smelted in the converter, it is refined outside the LF furnace, adding 3.36 tons of ferromanganese, 0.12 tons of ferro-niobium, 0.84 tons of ferrosilicon, 0.80 tons of ferrochrome and 0.42 tons of ferromolybdenum, and then vacuum degassing in the RH process and adding 0.13 tons of ferro-titanium , the vacuum degree of vacuum degassing is 0.25KPa, and the deep vacuum time is 20min; the molten steel is sent to the casting machine for continuous casting, and the superheat of the molten steel is controlled a...

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Abstract

The invention discloses a high-strength steel plate with excellent cold forming property and a manufacturing method of the high-strength steel plate. The manufacturing method comprises the following steps: performing converter smelting on molten iron, heating to 1250-1350 DEG C, adding waste steel, adding aluminum by a single slag process for deoxidation and alloying, tapping in which a steel ladle needs to be subjected to bottom argon blowing, blocking slag, performing LF furnace secondary refining on molten steel subjected to converter smelting, adding ferromanganese, ferroniobium, ferrosilicon, ferrochromium and ferromolybdenum, performing RH process vacuum degassing, and adding ferrotitanium; conveying the molten steel to a casting machine for continuous casting; reheating a prepared plate blank; descaling; roughly rolling; finely rolling; cooling; hotly straightening; performing heat treatment; shearing; hardening and tempering; sampling; checking; warehousing the finished steel plate. According to the manufacturing method, the high-strength steel plate with excellent cold forming property is manufactured by adopting a low-carbon component design, properly adding elements capable of improving hardenability, improving steel purity and optimizing heat treatment and hardening and tempering processes.

Description

technical field [0001] The invention relates to the technical field of medium and thick plates, in particular to a high-strength steel plate with excellent cold forming performance and a manufacturing method thereof. Background technique [0002] Low-alloy high-strength steel is widely used in various types of construction machinery. With the development of large-scale, high-efficiency, and lightweight construction machinery and equipment, high-strength construction machinery steel is widely used in construction machinery manufacturing. Steel for construction machinery needs to have high strength, good low temperature toughness, good fatigue resistance, good cold forming performance, good welding performance, etc. Especially with the development of technology, users of high-strength steel pay more and more attention to the cold formability of steel plates, and generally the higher the strength of steel plates, the worse their cold formability. [0003] The patent applicatio...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/28C21D8/02
CPCC21D8/0226C21D8/0263C22C38/28C22C38/38Y02P10/20
Inventor 刘泽田陆斌李浩高军惠鑫王宏盛华国龙王雅彬
Owner INNER MONGOLIA BAOTOU STEEL UNION
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