440 MPa corrosion resisting steel for ship at low temperature environment and production method of corrosion resisting steel

A low-temperature environment and production method technology, applied in the field of marine engineering steel and its production method, can solve the problems of high price and achieve the effects of improving corrosion resistance, improving impact toughness, and excellent seawater corrosion resistance

Active Publication Date: 2018-01-09
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the minimum service temperature of the prepared steel is only -60°C. At the same time, in order to further improve the corrosion resistance of the steel, it is necessary to add expensive alloying elements such as Zr and Ta, and to increase the strength of the steel, it is also necessary to add Cr elements.

Method used

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  • 440 MPa corrosion resisting steel for ship at low temperature environment and production method of corrosion resisting steel
  • 440 MPa corrosion resisting steel for ship at low temperature environment and production method of corrosion resisting steel
  • 440 MPa corrosion resisting steel for ship at low temperature environment and production method of corrosion resisting steel

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Embodiment Construction

[0034] In order to better explain the present invention, the main content of the present invention is further clarified below in conjunction with specific examples, but the content of the present invention is not limited to the following examples.

[0035] By controlling the chemical components and mass percentage content of each embodiment, the obtained Table 1 is as follows:

[0036] Table 1 each embodiment of the present invention and the chemical component of comparative example and mass percent content

[0037]

[0038]

[0039] Carry out the steel materials composed of various chemical components of the above-mentioned embodiments 1 to 8 according to the following process steps: 1) conventional molten iron desulfurization: control S in molten iron to 0.001%;

[0040] 2) Converter smelting and RH vacuum treatment: control molten steel C: 0.031~0.105%, P≤0.009%;

[0041] 3) Slab continuous casting and heating: control the heating temperature of the slab between 1200...

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Abstract

The invention discloses a corrosion-resistant steel for 440MPa ships in a low-temperature environment and a production method thereof, belonging to the technical field of material steel. It includes the following components in mass percentage: C: 0.031-0.105%, Si: 0.18-0.65%, Mn: 0.52-2.05%, P≤0.009%, S≤0.001%, Als: 0.080-0.200%, Nb: 0.021 to 0.070%, Ti: 0.045 to 0.125%, Ni: 0.10 to 0.35%, and the balance is Fe and unavoidable impurities. The production method is 1) conventional molten iron desulfurization; 2) converter smelting and RH vacuum treatment; 3) billet continuous casting and heating; 4) section rolling; 5) cooling. The prepared steel plate can be used in an extremely cold and low temperature environment of around ‑80°C. The yield strength of the steel plate is ≥440Mpa, the impact toughness KV2≥100J, and the seawater corrosion performance is better than the traditional seawater corrosion-resistant steel 10CrMoAl.

Description

technical field [0001] The invention relates to a steel for marine engineering and a production method thereof, belonging to the technical field of material steel, in particular to a corrosion-resistant steel for ships of 440MPa grade in a low-temperature environment and a production method thereof. Background technique [0002] The Arctic is one of the focuses of competition among countries in the world. Taking the Arctic waterway can save a lot of ocean transportation resources, thus promoting the development of new concept ships such as Arctic shuttle tankers, icebreakers, and icebreaker container ships. New requirements include high strength, high toughness and seawater corrosion resistance in extremely cold environments. [0003] On June 19, 2017, the applicant applied for an invention patent application document titled high-strength, high-toughness corrosion-resistant steel that can be used in a low-temperature environment of -60°C and its production method. The applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/14C22C38/08C22C38/06C22C38/12C21D8/02
Inventor 张开广陈颜堂范巍童明伟郭斌卜勇洪霞黄静郑静
Owner 武汉钢铁有限公司
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