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A manufacturing method of marine 5ni steel plate with low remanence and excellent surface quality

A technology of surface quality and manufacturing method, applied in the manufacturing field of marine 5Ni steel plate, can solve the problems of prolonging the production process and increasing the production cost, so as to achieve the effect of protecting the surface quality, preventing the steel plate from being scratched and improving the tensile strength

Active Publication Date: 2022-07-15
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Billet opening has a good effect on the uniformity of the steel plate structure and properties, but it also significantly increases the production cost and prolongs the production process.

Method used

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  • A manufacturing method of marine 5ni steel plate with low remanence and excellent surface quality
  • A manufacturing method of marine 5ni steel plate with low remanence and excellent surface quality
  • A manufacturing method of marine 5ni steel plate with low remanence and excellent surface quality

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Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with the embodiments.

[0038] A production process flow of a marine 5Ni steel plate is: converter smelting->LF refining->RH high vacuum degassing->Ca treatment->continuous casting->slab slow cooling treatment->slab surface cleaning->heating->rolling Manufacturing -> quenching twice -> tempering, including the following specific steps:

[0039] (1) smelting: select high-quality raw materials, adopt 150 tons of converter smelting, after RH high-vacuum degassing treatment, send into LF furnace for refining and break air to carry out Ca treatment, then through RH vacuum degassing, the alloy components of embodiment 1-4 Controls are shown in Table 1.

[0040] (2) Continuous casting: The smelted molten steel is cast into a continuous casting billet with a thickness of 150mm, and the casting temperature is controlled at 5-25°C above the liquidus line. The whole process is argon protected and poure...

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Abstract

The invention relates to a method for manufacturing a marine 5Ni steel plate with low remanence and excellent surface quality. The technological process is converter smelting->LF refining->RH high vacuum degassing->Ca treatment->continuous casting->cast slab slow cooling treatment ‑>Blank surface cleaning‑>heating‑>rolling‑>twice quenching‑>tempering. The component design adopts low carbon, low silicon, 5% Ni, and adds V and Nb to improve hardenability and low temperature toughness, and increase the non-recrystallization start temperature of austenite, so that the steel plate can be rolled and quenched at high temperature, and then Significantly improve the plate shape, making it suitable for the production of thin-gauge products. This application is optimized from the perspectives of element design, process control, base metal structure, center segregation, quenching and tempering temperature and time, etc., while achieving high strength of 5Ni steel plate, ensuring that the steel plate has good elongation and low temperature impact toughness of ‑130℃ , excellent surface quality and low remanence.

Description

technical field [0001] The invention relates to a method for manufacturing a marine steel plate, in particular to a method for manufacturing a marine 5Ni steel plate. Background technique [0002] Liquefied Petroleum Gas (LPG) in addition to pipeline transportation, the most important transportation method is sea transportation. Ships are used to store and transport LPG, LPG and liquefied ethylene (LEG) obtained by petroleum cracking and liquefaction. It is constructed of 5Ni steel with high strength, good low temperature toughness and high elongation. 5Ni steel means that the content of Ni in the steel reaches about 5%. Due to the high Ni content of 5Ni steel, high surface quality requirements, and low requirements for the participation of impurities, higher requirements are put forward for production processes such as smelting, rolling, and heat treatment. In addition, low remanence is also an important factor restricting the mass production of 5Ni steel. [0003] The p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C22C38/08C22C38/06C22C38/04C22C38/02C22C33/04C21D8/02C21D1/18
CPCC22C38/12C22C38/08C22C38/06C22C38/04C22C38/02C22C38/002C22C38/001C22C33/04C21D8/0205C21D8/0247C21D1/18C21D9/46C21D6/001C21D1/26C21D2211/008C21D1/60C21D8/1222C21D8/1261C21D8/1205C21D1/19C21D8/0226C21D8/0273
Inventor 刘朝霞许晓红白云苗丕峰刘俊韩步强周永浩武金明高俊李国忠狄梦龙孟羽廖书全芦莎高亮
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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