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Steel plate for offshore platform and preparation method thereof

A technology for offshore platforms and steel plates, which is applied in the field of steel plates for offshore platforms and its manufacturing, can solve the problems of high process cost, long production cycle, uncertain use environment requirements, etc., to achieve uniform mechanical properties and reduce production costs.

Inactive Publication Date: 2015-06-17
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patents add more Mn, V, Ti, ≥90mm steel plate adopts die casting, and is water-cooled after normalizing, the process cost is high, and the production cycle is long; the transverse impact performance at -20°C is better, and the center transverse impact at -40°C The performance is unknown, and it is not sure whether it can meet the requirements of the operating environment below -20°C

Method used

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  • Steel plate for offshore platform and preparation method thereof
  • Steel plate for offshore platform and preparation method thereof
  • Steel plate for offshore platform and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment １

[0042] The process flow of the present invention is: blast furnace molten iron→pre-desulfurization of molten iron→converter smelting→deoxidation alloying→LF refining→RH refining→slab continuous casting→slab off-line stacking and slow cooling→slab cleaning→slab reheating→ 4300 rolling mill rough rolling → 4300 rolling mill controlled rolling → Mulpic controlled cooling → steel plate stacking slow cooling → flaw detection → normalizing → finished product sampling inspection → storage.

[0043] According to the range of chemical composition provided by the present invention, according to the above-mentioned process flow and specified process conditions, the molten steel is smelted on a 210-ton converter, the molten steel is cast into a 300mm thick slab, and a 100mm steel plate is rolled on a 4300mm wide and thick plate rolling mill.

[0044] The chemical composition of the steel plate is shown in Table 1;

[0045] Table 1

[0046] .

[0047] The process parameters of heating, r...

Embodiment 2

[0055] The process flow of the present invention is: blast furnace molten iron→pre-desulfurization of molten iron→converter smelting→deoxidation alloying→LF refining→RH refining→slab continuous casting→slab off-line stacking and slow cooling→slab cleaning→slab reheating→ 4300 rolling mill rough rolling → 4300 rolling mill controlled rolling → Mulpic controlled cooling → steel plate stacking slow cooling → flaw detection → normalizing → finished product sampling inspection → storage.

[0056] According to the range of chemical composition provided by the present invention, according to the above-mentioned process flow and specified process conditions, molten steel is smelted on a 210-ton converter, cast into a 300mm thick slab, and 80mm steel plate is rolled on a 4300mm wide and thick plate rolling mill.

[0057] The chemical composition of the steel plate is shown in Table 4;

[0058] Table 4

[0059] .

[0060] The process parameters of heating, rolling and normalizing ar...

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Abstract

The present invention provides a steel plate and its manufacturing method for marine platforms. The invention passes the NB / V / Ti / Ni micro -alloy, low -carbon active CEQ, low -welded crack sensitivity index PCM, large thickness luggage, crude rolling large largePressing the amount, controlling cold control and positive hot treatment process, the production of steel plates for large thickness and high toughness, high toughness, and the production cost is low.

Description

technical field [0001] The invention belongs to the technical field of structural steel for ships and marine engineering, and in particular relates to a steel plate for marine platforms and a manufacturing method thereof. Background technique [0002] With the accelerated development of domestic offshore oil and natural gas, the development of the offshore engineering equipment manufacturing industry has been promoted, and the demand for steel plates for offshore engineering is promising. [0003] The technical indicators of steel plates for offshore platforms are extremely high, and they must have high strength, high toughness, fatigue resistance, lamellar tear resistance, good weldability, seawater corrosion resistance, and good cold workability. Domestically produced steel plates for offshore platforms have been widely used, and grades below EH36 are basically localized, accounting for 90% of the steel used in platforms. However, the large-thickness, high-strength steel u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C33/04C21D8/02
Inventor 王焕洋孙风晓徐洪庆李旺生李敏王勇朱延山
Owner JIGANG GRP