Ultrahigh-strength steel with fatigue limit larger than 600 MPa for ocean engineering and preparation method thereof

A technology of fatigue limit and marine engineering, applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of composition range and heat treatment temperature not within the scope of the present invention, and achieve easy manufacturing process, stable product performance, and excellent low temperature toughness Can effect

Active Publication Date: 2021-07-06
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The chemical composition design, preparation process and microstructure of this invention patent are significantly different from the present invention, and its composition range and heat treatment temperature are not within the scope of the present invention

Method used

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  • Ultrahigh-strength steel with fatigue limit larger than 600 MPa for ocean engineering and preparation method thereof
  • Ultrahigh-strength steel with fatigue limit larger than 600 MPa for ocean engineering and preparation method thereof
  • Ultrahigh-strength steel with fatigue limit larger than 600 MPa for ocean engineering and preparation method thereof

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Embodiment Construction

[0030] The chemical composition of the steel of the embodiment of the invention is shown in Table 1, the smelting process of the steel of the embodiment of the invention is shown in Table 2, the rolling process of the steel of the embodiment of the invention is shown in Table 3, the heat treatment process is shown in Table 4, and the mechanical properties are shown in Table 5.

[0031] Table 1 steel chemical composition of the embodiment of the present invention

[0032] Example C Si mn P S Cr Ni Mo V 1 0.10 0.27 0.88 0.002 0.001 0.62 6.80 0.80 0.06 2 0.08 0.35 0.95 0.001 0.001 0.50 7.50 0.85 0.05 3 0.09 0.20 0.75 0.001 0.0005 0.55 6.00 0.90 0.08 4 0.11 0.45 0.70 0.001 0.0005 0.70 7.00 0.87 0.07 5 0.08 0.50 0.85 0.001 0.0005 0.52 5.90 0.83 0.06 6 0.09 0.41 0.88 0.002 0.001 0.66 6.40 0.86 0.08 7 0.10 0.22 0.80 0.001 0.0005 0.57 8.00 0.88 0.06 8 0.09 0.37 1.00 0...

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Abstract

The invention belongs to the field of preparation of steel and iron materials, and discloses ultrahigh-strength steel with the fatigue limit larger than 600 MPa for ocean engineering and a preparation method thereof. The ultrahigh-strength steel comprises the chemical components in percentage by weight: 0.08-0.11% of C, 0.20-0.50% of Si, 0.70-1.00% of Mn, 6.00-8.00% of Ni, 0.50-0.70% of Cr, 0.80-0.90% of Mo, 0.05-0.08% of V, less than or equal to 0.003% of P, less than or equal to 0.001% of S and the balance Fe and inevitable impurities. According to the steel plate manufacturing method of the ultrahigh-strength steel, a controlled rolling process is adopted, then a steel plate is subjected to a quenching and tempering heat treatment process, the yield strength of the steel plate is larger than or equal to 1000 MPa, the fatigue limit is larger than or equal to 600 MPa, and the impact energy at the temperature of -80 DEG C is larger than or equal to 100 J; and the microstructure of the steel plate is tempered martensite and VC precipitated phase.

Description

technical field [0001] The invention belongs to the field of iron and steel material preparation, in particular ultra-high-strength steel for marine engineering with a high-cycle fatigue limit greater than 600 MPa and a manufacturing method thereof. Background technique [0002] The main steel components of ships and marine engineering equipment serve in severe marine environments such as waves, tides, storms and cold drift ice, and most of them work under certain cyclic or alternating loads, so fatigue damage is one of the main failure modes. one. Because there is no obvious macroscopic plastic deformation, the fatigue damage is sudden, which often causes catastrophic accidents and huge economic losses. Therefore, improving the fatigue resistance of ultra-high-strength steel for marine engineering and ensuring the safety of marine equipment is of great significance for the development of marine resources and the development of marine transportation. [0003] At present, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/46C21D1/18C21D6/00C21D8/02C21D9/00
CPCC22C38/02C22C38/04C22C38/44C22C38/46C22C38/002C21D1/18C21D6/004C21D6/005C21D6/008C21D8/0226C21D9/0081C21D2211/008
Inventor 周成叶其斌田勇阚立烨王昭东
Owner NORTHEASTERN UNIV
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