Low-cost extra-thick wear-resistant steel plate for a marine platform rack and production method thereof

A technology of offshore platform and production method, which is applied in the field of iron and steel, can solve the problems of low hardness and high cost, and achieve the effect of high hardness, small performance difference, and strong stability and uniformity

Inactive Publication Date: 2020-03-27
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The rack steel for traditional jack-up platform legs is designed with low-carbon and high-nickel ideas. The hardness of the tooth surface mainly depends on the original quenching and tempering performance of the steel plate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The chemical composition of the large-thickness steel plate for offshore platforms in this embodiment is: C: 0.30%, Si: 0.20%, Mn: 0.6%, P: 0.010%, S: 0.002%, Ni: 0.51% , Cr: 0.85%, Mo: 0.57%, TAl: 0.037%, and the balance is Fe and unavoidable impurities. The thickness of the steel plate is 180mm.

[0041] The production method of this embodiment steel plate, comprises the steps:

[0042] (1) Smelting process: the mass percentage will be C: 0.30%, Si: 0.20%, Mn: 0.6%, P: 0.010%, S: 0.002%, Ni: 0.51%, Cr: 0.85%, Mo: 0.57% , TAl: The molten steel with a composition of 0.037% is first smelted in an electric furnace, and then sent to the LF refining furnace for refining. During refining, it is fed with Al wire, and when the temperature of the molten steel is 1575°C, it is transferred to the VD furnace for vacuum degassing treatment. The vacuum degree is 30Pa, and the vacuum holding time is 25 minutes;

[0043] (2) Casting process: Cast molten steel after smelting at a ca...

Embodiment 2

[0051] The chemical composition of the steel plate for large-thickness offshore platforms in this embodiment is: C: 0.39%, Si: 0.33%, Mn: 0.51%, P: 0.009%, S: 0.001%, Ni: 0.6% , Cr: 0.80%, Mo: 0.51%, TAl: 0.028%, and the balance is Fe and unavoidable impurities. The thickness of the steel plate is 180mm.

[0052] The production method of this embodiment steel plate, comprises the steps:

[0053] (1) Smelting process: the mass percentage will be C: 0.39%, Si: 0.33%, Mn: 0.51%, P: 0.009%, S: 0.001%, Ni: 0.6%, Cr: 0.80%, Mo: 0.51% , TAl: 0.028%, the molten steel of the composition is first smelted in an electric furnace, and then sent to the LF refining furnace for refining, and the Al wire is fed during refining, and when the temperature of the molten steel is 1565°C, it is transferred to the VD furnace for vacuum degassing treatment, vacuum degassing treatment The vacuum degree is 23Pa, and the vacuum holding time is 25 minutes;

[0054] (2) Casting process: Cast molten stee...

Embodiment 3

[0062] The steel plate for large-thickness offshore platform in this embodiment, the chemical composition of the steel plate is: C: 0.35%, Si: 0.26%, Mn: 0.55%, P: 0.011%, S: 0.002%, Ni: 0.55% , Cr: 0.80%, Mo: 0.55%, TAl: 0.030%, and the balance is Fe and unavoidable impurities. The thickness of the steel plate is 180mm.

[0063] The production method of this embodiment steel plate, comprises the steps:

[0064] (1) Smelting process: the mass percentage will be C: 0.35%, Si: 0.26%, Mn: 0.55%, P: 0.011%, S: 0.002%, Ni: 0.55%, Cr: 0.80%, Mo: 0.55% , TAl: The molten steel with a composition of 0.030% is first smelted in an electric furnace, and then sent to the LF refining furnace for refining. During refining, it is fed with Al wire, and when the temperature of the molten steel is 1570°C, it is transferred to the VD furnace for vacuum degassing treatment. The vacuum degree is 41Pa, and the vacuum holding time is 25 minutes;

[0065] (2) Casting process: Cast molten steel afte...

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Abstract

The invention discloses a low-cost extra-thick wear-resistant steel plate for a marine platform rack. The steel plate comprises the following chemical components, in mass percent, 0.30% to 0.40% of C,0.15% to 0.35% of Si, 0.5% to 0.6% of Mn, <=0.012% of P, <=0.002% of S, 0.5% to 0.6% of Ni, 0.8% to 0.9% of Cr, 0.50% to 0.60% of Mo, 0.020% to 0.045% of TAl (all aluminum), and the balance of Fe andinevitable impurities. The steel plate is prepared by electric furnace smelting, vacuum extraction, die-casting, air-temperature rolling, and two different temperature quenching and tempering treatments of an extra-thick quencher, has mechanical properties of high strength and hardness, good wear resistance, and good low-temperature impact toughness, and is low cost due to the low content of precious alloy elements.

Description

technical field [0001] The invention belongs to the technical field of iron and steel, and in particular relates to a low-cost, extra-thick, wear-resistant steel plate for racks of offshore platforms and a production method thereof. Background technique [0002] In recent years, with the continuous strengthening of the development of marine resources at home and abroad, the steel for marine engineering machinery has developed rapidly, and the market demand for steel plates for offshore platforms has also increased. Racks, one of the most important components of deep-sea jack-up offshore platforms, have a significant trend of large thickness, high strength, and high toughness, and their special use environment also puts forward higher requirements for the wear resistance of steel plates. [0003] The rack steel for traditional jack-up platform legs is designed with low carbon and high nickel. The hardness of the tooth surface mainly depends on the original quenching and tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C21D1/25C21D1/26C21D3/06C21D6/00C21D8/02C21D9/00C22C38/02C22C38/04C22C38/06C22C38/44
CPCC21D1/25C21D1/26C21D3/06C21D6/002C21D6/005C21D6/008C21D8/0221C21D9/0081C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/44
Inventor 庞辉勇邓建军龙杰李杰赵国昌于红伟王九清肖春江钟金红吴涛赵喜伟罗应明王通肖雄峰
Owner WUYANG IRON & STEEL
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