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690MPa thick steel plate for ocean engineering and manufacturing method of steel plate

A marine engineering, thick-gauge technology, applied in the field of marine engineering steel with excellent toughness, plasticity and weldability, with a yield strength of 690MPa, it can solve the problems not related to lamellar tear resistance and welding performance, and achieve good impact toughness , Excellent low temperature toughness, and the effect of ensuring uniformity

Inactive Publication Date: 2013-04-03
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The publication number is CN101984119A. The invention patent proposes that the yield strength is higher than 690MPa, the tensile strength is 770-940MPa, and the impact at -60°C is not less than 46J. It adopts TMCP+T, TMCP+L+T, Q+T and Q+L The +T process produces ultra-high-strength ship plates, but its thickness is only 20-50mm, which does not involve lamellar tear resistance and welding performance, mainly the results of laboratory research

Method used

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Embodiment 1

[0030] The thickness of 690MPa steel plate for marine engineering is 50mm, and its chemical composition is: C 0.1%, Si0.20%, Mn1.04%, Alt0.034%, Nb0.02%, V0.05%, Ti0.015%, Mo0 .33%, Ni0.7%, Cu0.28%, Cr0.55%, B0.0012%, P0.008%, S0.002%, and the rest are iron Fe and unavoidable impurities. The size of billet is 300*2400*3000mm, the size of steel plate is 50*2500*17280mm, the segregation of casting billet low-magnification inspection center is C class 0.5, table 1 is the controlled rolling and controlled cooling process parameters under this composition, and the quenching temperature is 930℃ , the tempering temperature is 650°C, and the tempering time is 150min. Table 2 shows the mechanical properties obtained under the process parameters. Table 3 Aging impact performance and Z-direction performance of steel plates. Table 8 -40°C impact energy of welded joints when the line energy is 50kJ / cm. attached figure 1 50mm thick steel plate rolling regulations, attached figure 2 , a...

Embodiment 2

[0040] The thickness of 690MPa steel plate for marine engineering is 120mm, and its chemical composition is: C 0.13%, Si0.2%, Mn1.0%, Alt0.039%, Nb0.022%, V0.04%, Ti0.01%, Mo0 .42%, Cu0.27%, Ni1.5%, Cr1.12%, B0.0017%, P0.009%, S0.001%, the rest is iron Fe and unavoidable impurities. The size of billet is 400*2200*3000mm, the size of steel plate is 120*2700*8148mm, and the segregation of low power inspection center of billet is C class 0.5. Table 5 is the controlled rolling and controlled cooling process parameters under this composition, and the quenching temperature is 930℃ , the tempering temperature is 620°C, and the tempering time is 360min. Table 6 shows the mechanical properties obtained under this process parameter. Table 7 Aging impact performance and Z-direction performance of steel plates. attached Figure 5 120mm thick steel plate rolling regulations, attached Figure 6 , attached Figure 7 And attached Figure 8 It is the microstructure of 120mm thick steel pl...

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Abstract

The invention discloses 690MPa thick steel plate for ocean engineering and a manufacturing method of the 690MPa thick steel plate, and belongs to the technical field of steel for the ocean engineering. The steel plate comprises the following chemical components: 0.08-0.15% of C, 0.10-0.30% of Si, 1.0-1.50% of Mn, 0.03-0.04% of Alt, 0.02-0.06% of Nb, 0.03-0.06% of V, 0.010-0.02% of Ti, 0.1-0.5% of Mo, 0.5-1.6% of Ni, 0.1-0.4% of Cu, 0.4-1.2% of Cr, less than 0.01% of P, less than 0.005% of S, less than or equal to 0.12% of Nb+V+Ti, 0.0005-0.0017% of B, and the balance of Fe and inevitable impurities. Quenching temperature and tempering temperature are controlled strictly; the thickness of the produced steel plate is 50-120mm; and the microstructure of the steel plate is tempered sorbite and a little tempered bainite. The steel plate and the manufacturing method have the advantages that the lamellar tearing resistance and low temperature toughness are ensured; uniformity of the thick steel plate in the thickness direction is ensured; and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of steel for marine engineering, and in particular relates to a steel for marine engineering with a thickness of 690 MPa and a manufacturing method thereof, specifically a steel for marine engineering with a yield strength of 690 MPa, excellent toughness, plasticity and weldability Methods. Background technique [0002] With the continuous development of marine equipment manufacturing technology, the requirements for the steel plates used are increasing, especially for key parts such as legs, shoes, cantilever beams, and rack lifting mechanisms of jack-up platforms. Ordinary high-strength steel cannot meet the load requirements. , These parts mainly use 460~690MPa high-strength steel plates. During the voyage of the jack-up platform, its legs need to be raised to more than 90m, and the increase of the center of gravity will inevitably reduce the stability of the platform's navigation. Therefore, increasing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C21D8/02
Inventor 狄国标王彦锋麻庆申刘金刚杨永达沈钦义姜中行韩承良王文军樊艳秋刘美艳张苏渊白学军何元春吴斌
Owner SHOUGANG CORPORATION
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