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Dispersion nanometer reinforced 690 steel and manufacturing method thereof

A manufacturing method and nanotechnology, applied in the field of 690 steel marine engineering equipment, can solve problems such as low stress corrosion resistance, high environmental fracture sensitivity, and restricted application.

Active Publication Date: 2019-09-06
INSTITUTE OF SCIENCE & TECHNOLOGY INNOVATION DONGGUAN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0004] However, the higher the strength of steel, the greater the sensitivity to environmental fracture and the lower the resistance to stress corrosion (hydrogen embrittlement), which restricts its application in complex marine environments.

Method used

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  • Dispersion nanometer reinforced 690 steel and manufacturing method thereof
  • Dispersion nanometer reinforced 690 steel and manufacturing method thereof
  • Dispersion nanometer reinforced 690 steel and manufacturing method thereof

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specific Embodiment approach

[0057] The melting, casting and melting process of the sample steel: The chemical composition of the sample steel is shown in Table 1. It is smelted and poured in a 150Kg vacuum induction furnace, cut out the shrinkage cavity, and forged into a billet of 100mm×100mm×120mm. The billet was reheated to 1250°C for 2h, and rolled in 7 passes on a laboratory 450nm two-roll reversible hot-rolling experimental mill, with a final plate thickness of about 12mm. The 12mm thick steel plate was placed in a box-type resistance furnace at 1250°C for 72h, so that the carbides were completely dissolved in the matrix as much as possible, and then quenched to room temperature. A standard thermal simulation sample with a diameter of 8mm and a length of 15mm was cut from the treated steel plate.

[0058] Determination of static continuous cooling transformation curve of sample steel (static CCT): carried out on MMS-300 thermal simulation testing machine, such as figure 1 The sample was heated to...

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Abstract

The invention discloses dispersion nanometer reinforced 690 steel and a manufacturing method thereof. The manufacturing method comprises the steps of casting, heating, rolling and heat treatment. Thesteel comprises the following chemical components of, in percentage by mass, 0.02%-0.30% of C, 0.50-2.0% of Mn, 0.04-0.10% of Al, 0.002-0.013% of V, 0.01-0.3% of Nb, 0.005-0.3% of Ti, 0.001-0.010% ofN, and the balance Fe and inevitable impurities. The manufacturing method comprises the casting process and the TMCP process. By adjusting and optimizing the ratio of the alloy elements in the steel,the hardenability of the steel is improved by virtue of the trace alloy elements, and meanwhile carbon nitride nano-scale second-phase particles are formed; and meanwhile, the TMCP process is adopted,and the precipitation behavior of the micro-alloy elements as well as the precipitation amount, size and distribution of grains are controlled, so that the grains are refined, the strength and toughness of the steel are improved, and good formability and corrosion resistance are obtained.

Description

technical field [0001] The invention relates to the application of 690 steel in the field of marine engineering equipment, in particular to a dispersion nano-strengthened 690 steel and a manufacturing method thereof. Background technique [0002] As a key structural material for offshore engineering equipment, steel is widely used in drilling platforms, production platforms and submarine pipelines. Due to the long service time and the long-term resistance to harsh wind and wave conditions, the cost of underwater repair and maintenance is extremely high. In addition to high strength, high toughness, fatigue resistance, laminar tear resistance, good weldability and cold working properties In addition, the corrosion resistance of marine atmosphere and seawater is also particularly important. [0003] Taking high-strength steel for offshore platforms as an example, its main grades are yield strength 355, 420, 460, 500, 550, 620, 690 MPa, while the pile legs, cantilever beams, l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/50C22C38/48C22C38/46C22C38/04C21D1/18C21D8/00
CPCC21D1/18C21D8/005C22C38/04C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 周梓荣王艳林
Owner INSTITUTE OF SCIENCE & TECHNOLOGY INNOVATION DONGGUAN UNIVERSITY OF TECHNOLOGY
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