Low-carbon silicon-manganese bainite high-strength steel and production method thereof

A carbon-silicon-manganese system and production method technology, applied in the field of low-carbon silicon-manganese bainitic high-strength steel and its production, can solve the problems of complex production process, low production efficiency and high production cost, and achieve short isothermal time and low cost. Low, the effect of improving toughness

Inactive Publication Date: 2015-12-16
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They all have excellent wear resistance, high strength and toughness, and have been initially applied in the fields of mining, electric power, metallurgy, building materials, etc., but their production processes are relatively complicated, the production efficiency is low, there are many alloy elements, and the production cost is high.
In recent years, there has been research on nano-bainite. Although the process is simple and the addition of alloy elements is less, its isothermal time is longer and its strength is high, but its toughness is not good and its application field is narrow.

Method used

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  • Low-carbon silicon-manganese bainite high-strength steel and production method thereof
  • Low-carbon silicon-manganese bainite high-strength steel and production method thereof
  • Low-carbon silicon-manganese bainite high-strength steel and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: The production method of the low-carbon silicomanganese-based bainitic high-strength steel adopts the following process steps.

[0020] (1) After the molten steel is smelted and cast into billets, it is forged into slabs; the mass percentages of chemical components in the slabs are: C0.15%, Si1.8%, Mn1.5%, P0.04%, S0 .02%, the balance is Fe and unavoidable impurities.

[0021] (2) Hot rolling and cold rolling process: the slab is hot rolled and cold rolled to obtain the final rolled plate; the hot rolling process is followed by rough rolling and finish rolling; the starting temperature of rough rolling is 1030°C, and the rough rolling pass The deformation is 25%; the total deformation of the finish rolling is 55%, the final rolling temperature is 830°C, and the thickness of the hot rolling final rolling is 5mm; then it is cold-rolled to 2mm through the cold rolling process.

[0022] (3) Heat treatment process: the final rolling plate is heated to 780°C at...

Embodiment 2

[0024] Embodiment 2: The production method of the low-carbon silicomanganese-based bainitic high-strength steel adopts the following process steps.

[0025] (1) After molten steel is smelted and cast into blanks, it is forged into slabs; the mass percentages of chemical components in the slabs are: C0.17%, Si1.56%, Mn1.8%, P0.05%, S0 .03%, the balance is Fe and unavoidable impurities.

[0026] (2) Hot-rolling and cold-rolling process: hot-rolling and cold-rolling the slab to obtain the final-rolled plate; hot-rolling is followed by rough-rolling and finish-rolling; The amount is 35%, the total deformation of the finish rolling is 50%, the finish rolling temperature is 850°C, and the thickness of the hot rolling finish rolling is 5mm; then it is cold rolled to 2mm through the cold rolling process.

[0027] (3) Heat treatment process: the final rolling plate is heated up to 800°C at 10°C / s, and held for 1800s; then heated to 950°C at 12°C / s, held for 600s; quenched in a salt ba...

Embodiment 3

[0029] Embodiment 3: The production method of the low-carbon silicomanganese-based bainitic high-strength steel adopts the following process steps.

[0030] (1) After molten steel is smelted and cast into blanks, it is forged into slabs; the mass percentages of chemical components in the slabs are: C0.22%, Si1.2%, Mn1.6%, P0.04%, S0 .02%, the balance is Fe and unavoidable impurities.

[0031] (2) Hot-rolling and cold-rolling process: hot-rolling and cold-rolling the slab to obtain the final-rolled plate; hot-rolling is followed by rough-rolling and finish-rolling; The amount is 30%, the total deformation of the finish rolling is 60%, the finish rolling temperature is 840°C, and the thickness of the hot rolling finish rolling is 6mm; then it is cold rolled to 3mm through the cold rolling process.

[0032] (3) Heat treatment process: the final rolling plate is heated up to 800°C at 8°C / s and held for 1200s; then heated to 980°C at 10°C / s and held for 600s; quenched in a salt ba...

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Abstract

The invention discloses low-carbon silicon-manganese bainite high-strength steel and a production method thereof. The method comprises a hot rolling process, a cold rolling process and a heat treatment process. The method adopts slabs for hot rolling, and the slab comprises the following chemical components in percentage by mass: 0.15-0.22 percent of C, 1.2-1.8 percent of Si, 1.5-1.8 percent of Mn, at most 0.05 percent of P, at most 0.03 percent of S and the balance of Fe and inevitable impurities. The heat treatment process comprises the following steps: raising the temperature of finished rolling plates obtained in the cold rolling process to 780-820 DEG C at the speed of 8-12 DEG C/s, and preserving heat for 1000-1800s; finally carrying out Q and PB processing, and thus obtaining the high-strength steel. The method adopts a design of component optimizing, so that the cost of raw materials is reduced. Through two-phase zone Mn partition in advance, Mn elements in austenite are non-uniformly distributed, the stability of the austenite before quenching is improved, and therefore and therefore the content of the retained austenite at room temperature is increased. Further, the TRIP effect is increased, and the toughness and the elongation are improved. The method has the advantages of being simple in process, convenient to industrialized production and short in isothermal time and effectively improves the production efficiency.

Description

technical field [0001] The invention relates to a high-strength steel and a production method thereof, in particular to a low-carbon silicon-manganese bainitic high-strength steel and a production method thereof. Background technique [0002] With the development of science and technology and the progress of society, the demand for various materials in the manufacturing industry is also getting higher and higher, and the performance requirements of materials are becoming more and more stringent. There is no doubt that the development of steel materials is very important. It promotes the entire Developments in the materials world. As a new type of material, bainitic steel has excellent mechanical properties. Since Danemport and E.C.Bain first discovered bainite in steel in the 1930s, many domestic and foreign researchers have done a lot of research work on it in the following decades. The theory of bainite has also made great progress, so the development and use of bainite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C21D6/00
Inventor 田亚强陈连生宋进英郑小平魏英立张宏军高天佐
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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