Steel plate for thick-gauge high-toughness EH36-level ocean platform and manufacturing method

An offshore platform, high toughness technology, applied in the field of hot rolling and heat treatment of steel plates, can solve the problems of increasing production costs, and achieve the effects of saving production costs, moderate strength margin, and low welding sensitivity index

Inactive Publication Date: 2016-03-30
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The most difficult thing to achieve in the technical index requirements of steel for offshore platforms is that the impact toughness and strength at the thickness 1 / 2 position are required to meet the technical requirements at the thickness 1 / 4 position specified in the standard, especially for steels with a thickness greater than 80-100mm Thick-gauge steel plates are more difficult to achieve, so manufacturers mostly use a large amount of precious metal Ni to improve the strength and toughness at the 1 / 2 position of the thickness, which will inevitably increase the production cost of the product

Method used

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  • Steel plate for thick-gauge high-toughness EH36-level ocean platform and manufacturing method
  • Steel plate for thick-gauge high-toughness EH36-level ocean platform and manufacturing method
  • Steel plate for thick-gauge high-toughness EH36-level ocean platform and manufacturing method

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example 1

[0033] The slab with a thickness of 300mm is put into the heating furnace, the slab exit temperature is 1210°C, the heating time is 240 minutes, and the soaking time is 50 minutes; the rough rolling start temperature is 1170°C, the finish rolling start temperature is 910°C, The thickness is 120mm, the final rolling temperature is 860°C, the ACC final cooling temperature is 660°C, the cooling rate is 8°C / s, the normalizing temperature is 880°C, and the holding time is 20min. The (weight percent) chemical composition of the finished slab is: C0.17%, Si0.38%, Mn1.48%, P0.009%, S0.003%, Alt0.026%, Nb0.040%, V0.050 %, Ti0.014%, Ni0.30%, La0.0015%, and the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 80 mm, the detailed rolling and heat treatment process is shown in Table 1, and its mechanical properties are shown in Table 2.

[0034] Table 1 Rolling and heat treatment process

[0035]

[0036] Table 2 Mechanical properties of steel pl...

Embodiment 2

[0039]Put the slab with a thickness of 300mm to be rolled into the heating furnace. The slab exit temperature is 1210°C, the heating time is 240 minutes, the soaking time is 50 minutes, the rough rolling start temperature is 1170°C, and the finish rolling start temperature is 1170°C. The rolling temperature is 910°C, the starting rolling thickness is 140mm, the final rolling temperature is 870°C, the final cooling temperature is 660°C, the cooling rate is 5°C / s, the normalizing temperature is 860°C, and the holding time is 30min. The (weight percent) chemical composition of the finished slab is: C0.17%, Si0.38%, Mn1.48%, P0.009%, S0.003%, Alt0.026%, Nb0.040%, V0.050 %, Ti0.014%, Ni0.30%, La0.0015%, and the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 100 mm, the detailed rolling and heat treatment process is shown in Table 3, and its mechanical properties are shown in Table 4.

[0040] Table 3 Rolling and heat treatment process

[0...

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Abstract

The invention discloses a steel plate for a thick-gauge high-toughness EH36-level ocean platform and a manufacturing method. The manufacturing method comprises the steps of heating of a plate blank, and rolling, cooling and heat treatment of the steel plate. A finished plate blank is composed of, by weight, 0.15%-0.18% of C, 0.30%-0.50% of Si, 1.4%-1.6% of Mn, 0-0.015% of P, 0-0.005% of S, greater than or equal to 0.020% of Alt, 0.030%-0.050% of Nb, 0.030%-0.050% of V, 0.008%-0.020% of Ti, 0.15%-0.30% of Ni, 0.0010%-0.0020% of La, and the balance Fe and impurities. The content of the Ni is low and the trace rare earth element La is added to serve as an alloying design for improving the strength and toughness of the steel plate; a normalizing heat treatment technique is adopted after controlled rolling and cooling, and accordingly the steel plate for the high-strength high-toughness thick-gauge ocean platform is obtained.

Description

technical field [0001] The invention relates to a steel plate hot rolling and heat treatment technology, in particular to a thick-gauge, high-toughness EH36 grade steel plate for offshore platforms and a manufacturing method. Background technique [0002] At present, most of the thick steel plates used in marine engineering meet the performance requirements through normalizing heat treatment or controlled rolling and controlled cooling process. [0003] The patent application of Chinese Publication No. CN102011050A discloses a kind of 36kg grade offshore platform steel and its production method, wherein, the 36Kg grade marine platform steel of 50~80mm thickness is treated by normalizing; A controlled-rolling-controlled-cooling offshore platform steel and its production method, wherein, the 10-60mm thick 40Kg grade offshore platform steel is produced through the controlled rolling and controlled cooling process; "Development of 80mm thick EH36 high-strength hull structure ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/08C22C38/12C22C38/14C21D8/02
CPCC21D8/02C22C38/005C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14
Inventor 董瑞峰樊立峰刘泽田高军白永强吴鹏飞
Owner INNER MONGOLIA UNIV OF TECH
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