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Grade-E series ship plate steel and preparing method thereof

A ship plate steel, series technology, applied in the field of E-class ship plate steel and its preparation, can solve the problems of poor low temperature toughness and high non-plastic transition temperature of ship plate steel

Active Publication Date: 2019-12-24
SGIS SONGSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the deficiencies in the prior art, the purpose of the embodiment of the present application includes providing an E-class series ship plate steel and its preparation method, so as to improve the technical problems of the E-class series ship plate steel with poor low-temperature toughness and high non-plastic transition temperature

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  • Grade-E series ship plate steel and preparing method thereof
  • Grade-E series ship plate steel and preparing method thereof
  • Grade-E series ship plate steel and preparing method thereof

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preparation example Construction

[0061] The preparation method of the E-class series ship plate steel includes: casting slab heating, controlled rolling and controlled cooling, and finishing finished products. The inventors of the present application found that during the implementation of the controlled cooling technology, due to the inappropriate regulation of the rolling temperature and the large difference in the cooling rate between the surface and the core of the steel plate during the rolling and laminar cooling process, the metallographic structure of the steel plate is uneven , affecting the mechanical properties of the steel plate. Through creative research and experiments, the inventors of the present application propose to limit the starting rolling temperature, finishing rolling temperature and finishing cooling temperature in the controlled rolling and controlled cooling step. It should be noted that the heating of the slab and the finishing of the finished product in the preparation method of t...

Embodiment 1

[0071] This embodiment provides a kind of E grade series ship plate steel, the specification is E36 ship plate steel with a thickness of 50mm, and its chemical composition (wt%) is as follows: C: 0.1079wt%, Si: 0.4205wt%, Mn: 1.544wt%, P: 0.0200wt%, S: 0.0038wt%, Cr: 0.013wt%, Ni: 0.044wt%, Mo: 0.116wt%, Cu: 0.015wt%, Als: 0.0228wt%, W: 0.001wt%, Ti: 0.0152wt%, V: 0.0299wt%, Nb: 0.0483wt%, and the balance is Fe. 0.5(V+Als)+Nb+Ti=0.090wt%.

[0072] The preparation method includes: pre-desulfurizing the molten iron after the blast furnace molten iron enters the mixing furnace, smelting the pre-desulfurized molten iron in a 120t converter, then performing LF furnace refining and RH refining, and passing the refined molten steel through a continuous casting machine for continuous casting of slabs. After the slab is heated, it is rolled, laminar flow cooled and finished, and the finished product is put into storage.

[0073] Wherein, rolling cooling comprises the following steps ...

Embodiment 2

[0078] This embodiment provides a kind of E grade series ship plate steel, the specification is the E ship plate steel with a thickness of 50mm, and its chemical composition (wt%) is as follows: C: 0.085wt%, Si: 0.416wt%, Mn: 1.5481wt%, P: 0.0042wt%, S: 0.011wt%, Cr: 0.014wt%, Ni: 0.001wt%, Mo: 0.112wt%, Cu: 0.014wt%, Als: 0.021wt%, W: 0.001wt%, Ti: 0.012wt%, V: 0.037wt%, Nb: 0.0483wt%, and the balance is Fe. 0.5(V+Als)+Nb+Ti=0.089wt%.

[0079] The preparation method includes: pre-desulfurizing the molten iron after the blast furnace molten iron enters the mixing furnace, smelting the pre-desulfurized molten iron in a 120t converter, then performing LF furnace refining and RH refining, and passing the refined molten steel through a continuous casting machine for continuous casting of slabs. After the slab is heated, it is rolled, laminar flow cooled and finished, and the finished product is put into storage.

[0080] Wherein, rolling cooling comprises the following steps car...

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Abstract

The invention relates to grade-E series ship plate steel and a preparing method thereof and belongs to the technical field of ship plate steel. According to the grade-E series ship plate steel , the occluded foreign substance grade of the grade-E series ship plate steel is not higher than 1.5 grade, the banded structure grade of the grade-E series ship plate steel ranges from 3.0 grade to 4.0 grade, and the central grain size of the metallographic structure of the grade-E series ship plate steel is not smaller than 9.0 grade. The occluded foreign substance grade, the banded structure grade andthe grain size of the metallographic structure of the grade-E series ship plate steel are limited to form many carbide particles, the grain-boundary strength of the grade-E series ship plate steel isremarkably improved, the structure toughness is improved, crack growth is weakened, and the nil-ductility transition temperature of the grade-E series ship plate steel is reduced and is not higher than minus 40 DEG C.

Description

technical field [0001] The present application relates to the technical field of ship plate steel, and in particular relates to an E-class series ship plate steel and a preparation method thereof. Background technique [0002] Ship plate steel, as a special steel, has high requirements on variety, quality and delivery time. General-strength A and B-grade ship plates can meet their technical and mechanical performance requirements through ordinary rolling, so the production process is relatively simple; while the production of D, E-grade and high-strength ship plates requires relatively complete equipment Under the equipment, it can be realized through preparation techniques and other means. At present, there are defects in the mechanical properties of E-class series ship plate steel, especially the low temperature toughness is difficult to guarantee, the yield rate of the prepared products is low, and the non-plastic transition temperature (NDT) is high. Contents of the i...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21D8/02
CPCC21D8/0226C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 林晏民肖命冬孙福猛李富强章玉成朱祥睿罗新中
Owner SGIS SONGSHAN CO LTD
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