V-N microalloyed high-toughness large-specification steel angle and production method thereof

A technology of micro-alloying and large-scale toughness, which is applied in the field of hot-rolled section steel and can solve problems such as easy fracture of angle steel

Active Publication Date: 2014-07-09
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In addition, the quality grades of the angle steel used for power towers currently used in my country are usually A and B grades, so the angle steel used for power towers is prone to fracture accidents under low temperature and bad weather conditions

Method used

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  • V-N microalloyed high-toughness large-specification steel angle and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In Example 1, the process parameters of the rolling process are controlled as follows: the rectangular billet obtained by continuous casting is heated to 1265 ° C in a heating furnace and then subjected to rough rolling and finish rolling. The starting temperature of the rough rolling mill is controlled at 1050 ° C. The final rolling temperature is 820°C, and the single-pass reduction rate is greater than 20%. After rolling, atomization cooling is used to cool the angle steel uniformly and rapidly at a cooling rate of 28°C / s to 680°C, and then at a cooling rate of 0.05°C / s s cooling rate to 450 ° C, and then air cooled to room temperature. Produced according to the above process parameters, the final product structure is ultrafine ferrite + granular or short rod pearlite structure, the ferrite grain size is 3.4μm; and fine carbon and nitrogen are dispersed on the ferrite matrix Vanadium oxide or vanadium nitride particles with an average particle size of 9nm.

Embodiment 2

[0033] In Example 2, the process parameters of the rolling process are controlled as follows: the rectangular billet obtained by continuous casting is heated to 1275 ° C in a heating furnace and then subjected to rough rolling and finish rolling. The starting temperature of the rough rolling mill is controlled at 1060 ° C. The final rolling temperature is 850°C, and the single-pass reduction rate is greater than 20%. After rolling, atomization cooling is used to cool the angle steel uniformly and rapidly at a cooling rate of 26°C / s to 720°C, and then at a cooling rate of 2°C / s s cooling rate to 450 ° C, and then air cooled to room temperature. Produced according to the above process parameters, the final product structure is ultrafine ferrite + granular or short rod pearlite structure, the ferrite grain size is 3μm; and fine carbonitride is dispersed on the ferrite matrix Vanadium or vanadium nitride particles with an average particle size of 2 nm.

Embodiment 3

[0034] In Example 3, the process parameters of the rolling process are controlled as follows: the rectangular billet obtained by continuous casting is heated to 1269 ° C in a heating furnace and then subjected to rough rolling and finish rolling. The starting temperature of the rough rolling mill is controlled at 1057 ° C. The final rolling temperature is 828°C, and the single-pass reduction rate is greater than 20%. After rolling, atomization cooling is used to cool the angle steel uniformly and rapidly at a cooling rate of 32°C / s to 687°C, and then at a cooling rate of 1°C / s s cooling rate to 450 ° C, and then air cooled to room temperature. Produced according to the above process parameters, the final product structure is ultrafine ferrite + granular or short rod pearlite structure, the ferrite grain size is 3.1μm; and fine carbon and nitrogen are dispersed on the ferrite matrix Vanadium oxide or vanadium nitride particles with an average particle size of 3.6nm.

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Abstract

The invention relates to a V-N microalloyed high-toughness large-specification steel angle and a production method thereof. The V-N microalloyed high-toughness large-specification steel angle is composed of the following chemical components in percentage by weight: 0.14-0.20% of C, 0.20-0.50% of Si, 1.30-1.55% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 0.009-0.016% of N, 0.06-0.10% of V, 0.015-0.030% of Als and the balance of Fe. According to the formula of the chemical components and in a large-scale profile steel production line, the crystalline grains are thinned by controlling the parameters of continuous casting and rolling processes, and a cementite in a pearlite is distributed in a form of granules or in a short-rod form by use of a rapid controlled cooling process, and fine vanadium carbonitride or vanadium oxide particles are scattered and distributed on a ferrite substrate, and therefore, the purpose of improving the strength and the low-temperature toughness of the large-specification steel angle is reached; the mechanical property indexes of the V-N microalloyed high-toughness large-specification steel angle meet the standard requirements of Q460E.

Description

technical field [0001] The invention relates to a V-N micro-alloyed high-strength and tough large-size angle steel and a production method thereof, belonging to the technical field of hot-rolled section steel. Background technique [0002] Angle steel is widely used in steel structures, while large-scale angle steel is mainly used in iron tower manufacturing and building structures. At present, my country's power energy ultra-high voltage and ultra-high voltage transmission line construction projects are booming. By 2020, in order to meet the needs of "national networking, west-to-east power transmission, and north-south mutual supply", multiple million-level ultra-high voltages will be built in the north-south direction. The 12th Five-Year Plan proposes a UHV network construction investment of up to 270 billion yuan with "three verticals, three horizontals and one ring network". In the past ten years, the demand for electricity in my country has been growing at a rate o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12B21B37/74
Inventor 冯运莉宋卓斐李杰段宝美胡小明
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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