High-toughness quantitative-reduction ship plate marine steel and preparation method thereof

A high-toughness, industrial steel technology, applied in the steel field, can solve the problems of limited production specifications, limited production thickness specifications, and difficult production.

Inactive Publication Date: 2021-03-26
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cost of this component system is low, the production specifications are limited, and it is difficult to meet the market demand for extra-thick specifications.
[0008] After analyzing the existing technology, it is found that the TMCP ship plate marine steel in

Method used

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  • High-toughness quantitative-reduction ship plate marine steel and preparation method thereof
  • High-toughness quantitative-reduction ship plate marine steel and preparation method thereof
  • High-toughness quantitative-reduction ship plate marine steel and preparation method thereof

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Embodiment Construction

[0052] The chemical composition of the high-toughness reduction ship plate marine steel involved in the present invention is smelted in a converter according to the chemical composition shown in Table 1 and poured into a continuous casting slab or ingot, and the continuous casting slab or ingot is opened in the heating furnace Medium heating, rolling by medium and heavy plate rolling mill. See Table 2 for main process parameters such as slab discharge temperature, final rolling temperature, and final cooling temperature. The corresponding steel plate tensile strength, impact energy, crack arrest performance, thickness specifications, etc. are listed in Table 3, it can be seen that the steel of the present invention has excellent strength and toughness, and excellent crack arrest performance. figure 1 The microstructure photos of the steel of Example 6 are shown, showing that the microstructures are polygonal ferrite, acicular ferrite and fine pearlite.

[0053] Table 1 below ...

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Abstract

The invention discloses high-toughness quantitative-reduction ship plate marine steel. A steel plate comprises the following chemical components by weight percent: 0.04%-0.14% of C, 0.15%-0.45% of Si,0.90%-1.50% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.010%-0.040% of Nb, 0-0.20% of Cr, 0-0.030% of V, 0.005%-0.020% of Ti, 0.015%-0.050% of Als, less than or equal to 30 ppm of N, less than or equal to 30 ppm of O, less than or equal to 2 ppm of H, and the balance Fe and inevitable impurities, wherein Als is acid-soluble aluminum; a welding crack sensitivityindex (Pcm) of the steel plate is less than or equal to 0.22%; and a carbon equivalent value (CEV) is less than or equal to 0.39%. The steel plate is not liable to be broken and damaged, and has goodstrength and toughness, welding performance and crack arrest performance.

Description

technical field [0001] The invention belongs to the technical field of iron and steel, and in particular relates to a high-toughness reduction ship plate marine steel and a preparation method thereof. Background technique [0002] By controlling the cooling rate of the steel plate after rolling, a large number of dislocations and deformation bands generated during the rolling process can be retained in the steel plate structure to the greatest extent, which can play a significant strengthening role, reduce the amount of precious alloys added, reduce the hardenability of the steel plate, and improve Steel plate welding performance. However, in the process of water cooling, the uniformity of the thickness direction of the steel plate has always been a problem. How to effectively master the cooling process to promote the uniformity of the thickness direction of the steel plate, the strength, impact, and transverse and longitudinal properties of the steel plate near the surface,...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/26C22C38/24C22C38/28C22C38/06C21D8/02
CPCC21D8/0226C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/24C22C38/26C22C38/28
Inventor 杨建勋李国宝王军程文华刘朋赵登报迟婧刘琳牛宏波薛燕郑飞王润港王淑华
Owner SD STEEL RIZHAO CO LTD
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