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Thick ship plate steel and preparation method thereof

A ship plate steel, thick gauge technology, applied in the field of thick gauge ship plate steel and its preparation, can solve the problems of long normalizing time, low production efficiency, increased production cost, etc.

Active Publication Date: 2014-01-08
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the steel is added with alloys such as Cr, which increases the production cost, and at the same time, the normalizing holding time is relatively long, and the production efficiency is relatively low

Method used

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  • Thick ship plate steel and preparation method thereof
  • Thick ship plate steel and preparation method thereof
  • Thick ship plate steel and preparation method thereof

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preparation example Construction

[0030] The invention provides a thick-gauge ship plate steel and a preparation method thereof, which comprises the following components by weight percentage: C 0.09-0.14%; Si 0.15-0.40%; Mn 1.00-1.45%; P≤0.015%; S ≤0.010%; Nb 0.020~0.045%; Ti 0.010~0.025%; V 0.020~0.045%; Ni 0.20~0.45%; Cu 0.10~0.30%; Al 0.020~0.050%; .

[0031] Compared with the prior art, the invention provides that the components of the ship plate steel do not contain Cr, which reduces the cost of the ship plate steel. Moreover, the ship plate steel is low-carbon steel, which contains elements such as Ti, Si, Al, etc., so that the steel plate is light in weight and high in strength.

[0032] The present invention also provides a thick-gauge ship plate steel and a preparation method thereof, which uses the steel plate with a thickness of 40-80mm obtained by rough rolling and finishing rolling of the above ship plate steel. The ship plate steel plate provided by the present invention has a thickness of 40-8...

Embodiment 1

[0053] Example 1: 80mmEH36 industrial rolling

[0054] 1. The weight percentage of chemical composition is as follows:

[0055] C: 0.10%, Si: 0.27%, Mn: 1.42%, S: 0.004%, P: 0.011%, Nb: 0.030%, Ti: 0.016%, V: 0.045%, Ni: 0.028%, Cu: 0.17, Al : 0.022% and the rest are Fe and trace impurities.

[0056] 2. The manufacturing method of EH36 high-strength and high-toughness ship plate steel. The production process includes molten iron pretreatment, double blowing converter smelting, LF ladle refining, soft argon blowing, slab continuous casting, and rolling. The operation steps are as follows:

[0057] Molten iron is desulfurized by spraying magnesium particles in the molten iron tank, the sulfur in the molten iron is controlled below 0.020%, the temperature is not lower than 1250°C, and the slag on the surface of the molten iron is removed after desulfurization. The pretreated molten iron enters the converter for smelting, and the slagging material is added 3 minutes before the ...

Embodiment 2

[0061] Example 2: 60mmEH36 industrial rolling

[0062] 1. The chemical composition weight percentage of high-strength and high-toughness ship plate steel is as follows:

[0063] C: 0.14%, Si: 0.35%, Mn: 1.35%, S: 0.002%, P: 0.008%, Nb: 0.035%, Ti: 0.018%, V: 0.041%, Ni: 0.032%, Cu: 0.22, Al : 0.032% and the rest are Fe and trace impurities.

[0064] A manufacturing method of high-strength and high-toughness ship plate steel, the production process includes molten iron pretreatment, double blowing converter smelting, LF ladle refining, soft argon blowing, slab continuous casting, and rolling. The operation steps are as follows:

[0065] Molten iron is desulfurized by spraying magnesium particles in the molten iron tank, the sulfur in the molten iron is controlled below 0.01%, the temperature is not lower than 1250°C, and the slag on the surface of the molten iron is removed after desulfurization. The pretreated molten iron enters the converter for smelting, and the slagging ...

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Abstract

The invention provides thick ship plate steel and a preparation method thereof. The thick ship plate steel comprises the following components in percentage by weight: 0.09 to 0.14 percent of C, 0.15 to 0.40 percent of Si, 1.00 to 1.45 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, 0.020 to 0.045 percent of Nb, 0.010 to 0.025 percent of Ti, 0.020 to 0.045 percent of V, 0.20 to 0.45 percent of Ni, 0.10 to 0.30 percent of Cu, 0.020 to 0.050 percent of Al and the balance of Fe and inevitable impurities. The ship plate steel produced by the method has stable performance; moreover, the production cost is low and the production efficiency is high.

Description

technical field [0001] The invention relates to the field of steel materials and its preparation, in particular to a thick gauge ship plate steel and its preparation method. Background technique [0002] The steel plate for hull structure is one of the most widely used steel types in the shipbuilding industry. With the development of the global economy, the gradual deepening of the integration process, and the rapid development of the world shipping industry, the demand for large-tonnage ships is increasing year by year, and the demand for high-grade ship plate steel is increasing. Ship plate steel has the characteristics of high requirements and strict inspection, and is one of the high value-added steel products. The major manufacturers put the production of ship plate steel in an important position. [0003] The traditional production process to produce high-grade ship plate steel is basically divided into two stages of rolling, that is, rolling in the recrystallization...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16B21B37/74C21D1/28
Inventor 任继银周平张长宏衣忠文王腾飞孙其家麻衡刘军刚张鹏
Owner LAIWU STEEL YINSHAN SECTION CO LTD