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A large-thickness quenched and tempered FO460 marine steel plate and its manufacturing method

A large-thickness, ship-use technology, applied in the field of large-thickness TMCP FO460 ship-use steel plates and its manufacturing, can solve the problems of lack of experience in polar ship design and manufacturing, and achieve high shape and grain size control and uniform phase transformation structure The effect of refining and refining the grain size

Active Publication Date: 2022-07-19
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, my country lacks polar ship design and manufacturing experience, and there is a big gap compared with polar ship building powerhouses such as Finland, Japan, South Korea, the United States and Russia.

Method used

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  • A large-thickness quenched and tempered FO460 marine steel plate and its manufacturing method
  • A large-thickness quenched and tempered FO460 marine steel plate and its manufacturing method
  • A large-thickness quenched and tempered FO460 marine steel plate and its manufacturing method

Examples

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Embodiment Construction

[0035] Specific embodiments are described below in conjunction with the accompanying drawings:

[0036] It can be seen from the metallographic structure of Example 1 that the structure of the steel plate after the new controlled rolling + new quenching and tempering process is basically a tempered bainite structure, the original austenite of the steel plate and the structure of the finished steel plate have clear grain boundaries, The grains are very small (the austenite grain size is 8.5), so that the low temperature impact toughness and high strength level of the large-thickness quenched and tempered FO460 marine steel plate are realized.

[0037]The chemical composition of the large-thickness quenched and tempered FO460 steel sheet for ships of the present invention is shown in Table 1, the billet smelting process parameters are shown in Table 2, the rolling method and cooling process of the steel plate are shown in Table 3, the quenching and tempering process is shown in Ta...

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Abstract

The invention discloses a large-thickness quenched and tempered FO460 steel sheet for ships and a manufacturing method thereof. C: 0.06% to 0.10%; Si: 0.05% to 0.14%; Mn: 1.40% to 1.80%; S: ≤ 0.002%; P : ≤0.008%; Als: 0.015%~0.045%; N: 0.003%~0.015%; Nb: 0.01%~0.04%; Cu: 0.16%~0.35%; Ni: 0.30%~0.60%; Cr: 0.15%~ 0.30%; Ti: 0.008% to 0.014%; the balance is Fe and inevitable impurities. It can meet the technical requirements of marine steel plates in harsh and harsh environments.

Description

technical field [0001] The invention belongs to the field of iron and steel material preparation, and particularly relates to a large-thickness TMCP state FO460 marine steel plate and a manufacturing method thereof. Background technique [0002] Driven by the rapid growth of the shipbuilding industry in recent years, the demand for very low-quality ship steel has been rising rapidly year by year. However, my country lacks polar ship design and manufacturing experience, and there is a big gap compared with Finland, Japan, South Korea, the United States and Russia and other polar ship building powerhouses. In 2016, Guangzhou Shipbuilding International undertook the construction of the polar condensate tanker in the Yamal project in Russia. In 2017, CIMC Raffles, my country's largest offshore engineering company, undertook the construction of the "Viking Dragon" Arctic drilling platform ordered by Norway. Although Chinese shipbuilding enterprises have undertaken a small numbe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50C21D8/02
CPCC22C38/02C22C38/04C22C38/06C22C38/001C22C38/48C22C38/42C22C38/50C21D8/0205C21D8/0226C21D8/0263
Inventor 张鹏严玲王华田宇韩鹏王东旭陈华李广龙王晓航李文斌
Owner ANGANG STEEL CO LTD
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