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An economical air-cooled dual-phase low yield ratio steel plate and its production process

A low-yield-ratio, economical technology, applied in the field of low-yield-ratio steel plates, can solve problems such as low production efficiency, cost increase, and long production cycle, and achieve high production efficiency, low cost, and loose production process.

Active Publication Date: 2016-03-09
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of production process characteristics, most of the development and production of steel plates with low yield ratio currently use off-line heat treatment to obtain the performance requirements of low yield ratio and high strength, such as CN1786246A, CN101328564A, CN101260495A, CN101613828A, CN102011068A Other patents use sub-temperature quenching, sub-temperature quenching + tempering and other heat treatment processes. Although the yield ratio of the steel plate can be greatly reduced by the above method, the extra heat treatment process makes the production cycle longer, the cost increases, and the production efficiency is low.

Method used

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  • An economical air-cooled dual-phase low yield ratio steel plate and its production process
  • An economical air-cooled dual-phase low yield ratio steel plate and its production process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The steel consists of the following components (wt%): C: 0.08%, Si: 0.80%, Mn: 2.0%, P≤0.015%, S≤0.008%, Cr: 0.90%, the rest is Fe and unavoidable impurities , and the Mn / C ratio is 25, and the Si+Mn+Cr content is 3.7%.

[0027] 1) Smelt and continuously cast slabs according to the above ingredients, and heat the continuous casting slabs at a heating temperature of 1150-1180°C;

[0028] 2) Controlled rolling, rough rolling starting temperature ≤ 990°C, rough rolling finish rolling temperature ≥ 900°C, rough rolling total reduction is 35-65%, then wait for temperature; use intermediate cooling device for watering Cooling, when the temperature is cooled below 800°C, finish rolling is carried out, the finish rolling start temperature is 780-800°C, the finish rolling finish temperature is 700-720°C, the total reduction of finish rolling is 45-75%; the finished plate The thickness is 15mm, and after rolling, it is placed on a cooling bed and air-cooled to room temperature. ...

Embodiment 2

[0031] The steel consists of the following components (wt%): C: 0.08%, Si: 0.80%, Mn: 1.9%, P≤0.015%, S≤0.008%, Cr: 0.9%, the rest is Fe and unavoidable impurities , and satisfy the Mn / C ratio of 23.8, and the Si+Mn+Cr content of 3.6%.

[0032] 1) Smelt and continuously cast slabs according to the above ingredients, and heat the continuous casting slabs at a heating temperature of 1150-1180°C;

[0033] 2) Controlled rolling, rough rolling starting temperature ≤ 990°C, rough rolling finish rolling temperature ≥ 900°C, rough rolling total reduction is 35-65%, then wait for temperature; use intermediate cooling device for watering Cooling, when the temperature is cooled below 800°C, finish rolling is carried out, the finish rolling start temperature is 780-800°C, the finish rolling finish temperature is 700-720°C, the total reduction of finish rolling is 45-75%; the finished plate The thickness is 15mm, and after rolling, it is placed on a cooling bed and air-cooled to room temp...

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Abstract

The invention relates to an economic air-cooled dual-phase low yield ratio steel plate and a production process thereof. The steel plate comprises the following chemical components in percentage by weight: 0.07-0.09% of C, 0.70-0.90% of Si, 1.90-2.10% of Mn, less than or equal to 0.015% of P, less than or equal to 0.008% of S, 0.90-1.10% of Cr, and the balance of Fe and inevitable impurities. By controlling a Mn / C ratio at 21-25, Si+Mn+Cr content is 3.5-3.7%; through a low-temperature rolling process and by air cooling after cooling, a ferrite+martensite dual-phase structure is obtained; according to the prepared steel plate product, thickness is more than or equal to 15mm, yield strength Rp0.2 is less than or equal to 440MPa, tensile strength Rm is more than or equal to 690Mpa, percentage elongation after fracture is more than or equal to 14%, yield ratio (Rp0.2 / Rm) is less than or equal to 0.64 and impact energy at minus 20 DEG C is more than or equal to 60J.

Description

technical field [0001] The invention relates to a low yield ratio steel plate, in particular to an economical air-cooled dual-phase low yield ratio steel plate and a production process thereof. Background technique [0002] High-strength steel is one of the important engineering structural materials, widely used in bridge structures, building structures, machinery manufacturing and other fields. One of the important technical indicators in the performance of high-strength steel is the yield ratio. In engineering components with high safety requirements, there are strict requirements on the yield ratio of the steel plates used. With the improvement of the strength grade of high-strength steel, the requirements for the safety index of yield strength ratio are also getting higher and higher. At the same time, with the development of society and economy, the iron and steel industry is facing problems such as rising resource prices, slowing demand, and the environment. Therefor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C33/04C21D8/02
Inventor 镇凡张宽曲锦波
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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