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A kind of manufacturing method of steel plate with thick specification and high toughness eh36 grade offshore platform

A technology for offshore platforms and manufacturing methods, which is applied in the field of manufacturing thick-gauge, high-toughness EH36 grade steel plates for offshore platforms, can solve problems such as increasing production costs, and achieve the effects of saving production costs, moderate strength margins, and low welding sensitivity index

Inactive Publication Date: 2018-09-11
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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  • A kind of manufacturing method of steel plate with thick specification and high toughness eh36 grade offshore platform
  • A kind of manufacturing method of steel plate with thick specification and high toughness eh36 grade offshore platform
  • A kind of manufacturing method of steel plate with thick specification and high toughness eh36 grade offshore platform

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example 1

[0033] The slab with a thickness of 300mm is put into the heating furnace, the slab discharge temperature is 1210℃, the heating time is 240 minutes, and the soaking time is 50 minutes; the rough rolling opening temperature is 1170℃, the finishing rolling opening temperature is 910℃, and the opening rolling The thickness is 120mm, the final rolling temperature is 860℃, the ACC final cooling temperature is 660℃, the cooling rate is 8℃ / s, the normalizing temperature is 880℃, and the holding time is 20min. The chemical composition (weight percentage) of the finished slab is: C 0.17%, Si 0.38%, Mn 1.48%, P 0.009%, S 0.003%, Alt 0.026%, Nb 0.040%, V 0.050%, Ti 0.014%, Ni0 .30%, La 0.0015%, the balance is Fe and inevitable impurities. It is rolled into a steel plate with a thickness of 80mm. The detailed rolling and heat treatment process is shown in Table 1, and the mechanical properties are shown in Table 2.

[0034] Table 1 Rolling and heat treatment process

[0035]

[0036] Table 2...

Embodiment 2

[0039] Put the 300mm thick slab to be rolled into the heating furnace. The slab discharge temperature is 1210℃, the heating time is 240 minutes, the soaking time is 50 minutes, the rough rolling opening temperature is 1170℃, and the finishing rolling temperature It is 910℃, the open rolling thickness is 140mm, the final rolling temperature is 870℃, the final cooling temperature is 660℃, the cooling rate is 5℃ / s, the normalizing temperature is 860℃, and the holding time is 30min. The chemical composition (weight percentage) of the finished slab is: C 0.17%, Si 0.38%, Mn 1.48%, P 0.009%, S 0.003%, Alt 0.026%, Nb 0.040%, V 0.050%, Ti 0.014%, Ni0 .30%, La0.0015%, the balance is Fe and unavoidable impurities. It is rolled into a steel plate with a thickness of 100mm. The detailed rolling and heat treatment processes are shown in Table 3, and the mechanical properties are shown in Table 4.

[0040] Table 3 Rolling and heat treatment process

[0041]

[0042] Table 4 Mechanical properti...

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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 method for manufacturing a thick gauge high toughness EH36 grade steel plate for offshore platforms. 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 processes. [0003] The patent application of China Publication No. CN1020ll050A discloses a 36kg-grade steel for offshore platforms and its production method. Among them, the 36kg-grade steel for offshore platforms with a thickness of 50-80mm is normalized. The patent application of Chinese Publication No. CN101358320A discloses a A kind of controlled rolling and controlled cooling steel for offshore platform and its production method. Among them, 10~60mm thickness 40Kg steel for offshore platform is produced by controlled rolling and controlled cool...

Claims

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Application Information

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Patent Type & Authority Patents(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