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Steel for hot-rolling ribbed high-strength steel bars of 700 Mpa or above and production method of high-strength steel bars

A technology of hot-rolled ribbed and high-strength steel bars, which is applied in the field of hot-rolled ribbed steel bars, can solve the problems that hot-rolled ribbed steel bars cannot meet the strength requirements of building structures, so as to prevent secondary pollution, save alloy consumption, and avoid excessive The effect of oxidation

Inactive Publication Date: 2019-10-18
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that existing hot-rolled ribbed steel bars cannot meet the strength requirements of building structures, the present invention provides a steel for hot-rolled ribbed high-strength steel bars above 700Mpa and its production method; adopting micro-alloying design, converter (or electric arc Furnace) steelmaking, bar low-temperature temperature-controlled rolling process, under the condition of the existing process equipment of steel enterprises and the appropriate increase of motor power by 10%, large-scale industrial production of 700Mpa steel bars can be realized to meet the needs of high-rise and long-span steel bars in my country The need for concrete building structures

Method used

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  • Steel for hot-rolling ribbed high-strength steel bars of 700 Mpa or above and production method of high-strength steel bars
  • Steel for hot-rolling ribbed high-strength steel bars of 700 Mpa or above and production method of high-strength steel bars
  • Steel for hot-rolling ribbed high-strength steel bars of 700 Mpa or above and production method of high-strength steel bars

Examples

Experimental program
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Effect test

Embodiment 1

[0071] The chemical composition and mass percentage content of the steel for hot-rolled ribbed high-strength steel bars above 700Mpa in this embodiment are: C: 0.20-0.30%, Si: 0.80-1.20%, Mn: 1.30-1.50%, V: 0.10-0.20%, N: 0.015-0.025%, Cr: 0.40-0.60%, P: ≤0.025%, S: ≤0.010%, and the rest are Fe and unavoidable impurity elements.

[0072] Its corresponding embodiment main chemical constituent composition and mass percentage content are as shown in table 1:

[0073] The smelting chemical composition of table 1 embodiment 1

[0074]

[0075] The production method of a kind of hot-rolled ribbed high-strength steel bar above 700Mpa level of the present embodiment comprises the following steps:

[0076] S1. Converter or electric arc furnace steelmaking, and slag blocking and tapping (the slag contains P, S and other harmful elements, if the slag flows into the ladle, it will cause the molten steel to return to P and S), and the tapping temperature is 1635-1675°C. When 1 / 4 of th...

Embodiment 2

[0100] The chemical composition and mass percentage content of the steel for hot-rolled ribbed high-strength steel bars above 700Mpa in this embodiment are: C: 0.30-0.40%, Si: 0.80-1.20%, Mn: 1.00-1.20%, V: 0.15-0.25%, N: 0.015-0.025%, Cr: 0.80-1.00%, P: ≤0.020%, S: ≤0.010%, and the rest are Fe and unavoidable impurity elements.

[0101] Its corresponding embodiment main chemical constituent composition and mass percent content are as shown in table 5:

[0102] The smelting chemical composition of table 5 embodiment 2

[0103]

[0104] The production method of a kind of hot-rolled ribbed high-strength steel bar above 700Mpa level of the present embodiment comprises the following steps:

[0105] S1. Converter or electric arc furnace steelmaking, and slag blocking and tapping (the slag contains P, S and other harmful elements, if the slag flows into the ladle, it will cause the molten steel to return to P and S), and the tapping temperature is 1635-1675°C. When 1 / 4 of the s...

Embodiment 3

[0129] The chemical composition and mass percentage content of the steel for hot-rolled ribbed high-strength steel bars above 700Mpa in this embodiment are: C: 0.40-0.50%, Si: 0.80-1.20%, Mn: 1.00-1.20%, V: 0.15-0.25%, N: 0.015-0.025%, Cr: 0.80-1.00%, P: ≤0.020%, S: ≤0.010%, and the rest are Fe and unavoidable impurity elements.

[0130] Its corresponding embodiment main chemical constituent composition and mass percentage content are as shown in table 9:

[0131] The smelting chemical composition of table 9 embodiment 3

[0132]

[0133] The production method of a kind of hot-rolled ribbed high-strength steel bar above 700Mpa level of the present embodiment comprises the following steps:

[0134] S1. Converter or electric arc furnace steelmaking, and slag blocking and tapping (the slag contains P, S and other harmful elements, if the slag flows into the ladle, it will cause the molten steel to return to P and S), and the tapping temperature is 1635-1675°C. When 1 / 4 of th...

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Abstract

The invention discloses steel for hot-rolling ribbed high-strength steel bars of 700 Mpa or above and a production method of the high-strength steel bars and belongs to the technical field of hot-rolling ribbed steel bars. The steel for the hot-rolling ribbed high-strength steel bars contains the chemical components including, by mass, 0.20-0.50% of C, 0.80-1.20% of Si, 1.00-1.50% of Mn, 0.10-0.25% of V, 0.015-0.025% of N, 0.40-1.00% of Cr, 0-0.025% of P, 0-0.010% of S, and the balance Fe and inevitable impurity elements. By means of the microalloying design, converter (or electric-arc furnace) steel-making and bar low-temperature temperature-controlling rolling technology, under the conditions of existing technology equipment of steel enterprises and proper 10% increase of motor power, large-scale industrial production of the steel bars of 700 Mpa can be achieved, and thus the demands of high-rise and long-span reinforced concrete building structures in China are met.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled ribbed steel bars, and more specifically relates to a steel for hot-rolled ribbed high-strength steel bars above 700Mpa and a production method thereof. Background technique [0002] Commonly known as hot-rolled ribbed steel bar is rebar, which is widely used in civil engineering construction such as houses, bridges, and roads. At present, the use of hot-rolled ribbed steel bars at home and abroad is that 335Mpa grades have long been eliminated. Foreign countries such as Britain, Germany, Australia, and France have widely used high-strength steel bars with a yield strength of 500Mpa. 700Mpa grade high-strength steel bars. In recent years, with the introduction of a series of high-strength steel promotion and application policies in my country, the percentage of high-strength steel consumption has increased year by year. At present, domestic HRB500 high-strength steel bars have been mass-produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/18C21D8/08C22C33/04
CPCC21D8/065C21D8/08C22C33/04C22C38/001C22C38/02C22C38/04C22C38/12C22C38/18
Inventor 郭湛汪开忠吴坚杨应东于同仁赵海燕宋祖峰余良其黄社清张步海张晓瑞尹德福姜婷徐雁
Owner MAANSHAN IRON & STEEL CO LTD
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