Bainite sheet steel produced by controlled rolling and cooling method and preparation method thereof

A technology of controlled rolling, controlled cooling, and bainite, applied in metal rolling, metal rolling, rolling mill control devices, etc., can solve problems such as difficult process control, and achieve high production efficiency, simple and controllable production process

Active Publication Date: 2012-10-24
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the production of high-strength steel rolled by sheet rolling, the traditional quenching and tempering process has been replaced by the controlled rolling and controlled cooling (TMCP) process, thereby reducing production costs, reducing energy consumption, and improving production efficiency. To achieve the target of bainite structure control, there are generally strict requirements for various process parameters in the production process, such as heating temperature, rolling temperature at each stage, reduction rate and post-rolling cooling parameters, etc., and process control is difficult, especially for thin It is difficult to adjust the process according to the actual production situation to meet the steel plate shape requirements within the range of the existing given process parameters. Therefore, the thin specification (10-20mm) wide-width steel plate (the finished product width is ≥ 0.85 times the nominal value of the rolling mill) Width) The unevenness of the steel plate exceeds the standard is the biggest factor affecting the production of this type of steel plate

Method used

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  • Bainite sheet steel produced by controlled rolling and cooling method and preparation method thereof
  • Bainite sheet steel produced by controlled rolling and cooling method and preparation method thereof
  • Bainite sheet steel produced by controlled rolling and cooling method and preparation method thereof

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Effect test

Embodiment 1

[0030] The bainite thin steel plate produced by controlled rolling and controlled cooling technology has a thickness of 10 mm and a width of 3800 mm. The chemical composition is shown in Table 1 in terms of weight percentage, specifically: C: 0.05%, Si: 0.39%, Mn: 1.68% , P: 0.013%, S: 0.004%, Nb+Ti: 0.07%, Mo+Cr: 0.35%, Als: 0.035%, the rest is Fe and trace impurity elements, and C+Si / 30+(Mn+Cr) / 20+Mo / 15 (abbreviated as Pcm in Table 1) <0.25;

[0031] The specific preparation method is as follows:

[0032] (1) According to the predetermined composition, see Table 1, it is smelted on a 130t converter production line, and cast into a continuous casting slab with a specification of 250mm×1600mm×L.

[0033] example C Si mn P S Cr+Mo Nb+ Ti als Pcm 1 0.05 0.39 1.68 0.013 0.004 0.35 0.07 0.035 ＜0.25 2 0.02 0.50 1.70 0.012 0.005 0.40 0.08 0.030 ＜0.25 3 0.08 0.35 1.65 0.012 0.004 0.32 0.05 0.015 ＜0.25 4 0.06 0.40...

Embodiment 2-4

[0045] With reference to the method of Example 1, each bainite thin steel plate is prepared correspondingly according to the component content design and process conditions in Table 1-Table 3, wherein: the rolling of the steel plate on the roller table in the residual heat self-tempering in the embodiment 2-4 The time is 80s, 90s, and 120s respectively. The chemical composition content of the bainite thin steel plate prepared by this method is shown in Table 1, and the test results of the unevenness and mechanical properties of the steel plate are shown in Table 4.

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Abstract

The invention belongs to the field of single rolled steel plate rolling processes in metallurgy industry, in particular relates to a bainite sheet steel produced by controlled rolling and cooling technology, and is characterized by comprising the following chemical components by weight: 0.02-0.08% of C, 0.25-0.55% of Si, 1.65-1.85% of Mn, not more than 0.015% of P, not more than 0.008% of S, 0.05-0.08% of Nb+Ti, 0.30-0.50% of Mo+Cr, 0.015-0.05% of Als and the balance of Fe and trace impurity elements, wherein C+Si/30+(Mn+Cr)/20+Mo/15 is not more than 0.25. According to the bainite sheet steel, the thickness specification range is 10-20 mm, the width of a finished product is not less than 0.85 time of nominal width of a rolling mill, unevenness of the steel plate is not more than 6 mm/m, the intensity index ReL is not less than 550 MPa, Rm is not less than 670 MPa, A is not less than 20%, and -20 DEG C Akv is not less than 200 J.

Description

technical field [0001] The invention belongs to the field of single-rolled steel plate rolling technology in the metallurgical industry, and particularly relates to a bainite thin steel plate produced by a controlled rolling and controlled cooling method and a preparation method thereof. Background technique [0002] According to the different structure and morphology, the types of steel are generally divided into pearlite type, bainite type, martensite type and multiphase type composed of multiphase structure. Among them, bainitic steel is the steel with the most development and application prospects. It maintains high toughness, excellent welding performance, cold formability, corrosion resistance and other application properties while increasing its strength. In production, steel with a yield strength of 460~620MPa mainly adopts bainite structure, which is mainly used in various fields of economic construction such as raw material mining, energy development, transportatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38B21B1/46B21B37/00
Inventor 王世森李德发熊玉彰董汉雄张云燕洪君熊涛陈勇
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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