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A high-strain steel plate for high-homogeneity l485 marine line pipe and its manufacturing method

A high-strain, steel plate technology, applied in the field of metal materials, can solve the problems of high equipment capacity requirements, large differences in the thickness direction of tissue steel plates, and inability to directly assemble production, etc., to achieve excellent high-strain performance, reduce production costs, and steel plate structure and performance Uniform and stable effect

Active Publication Date: 2021-07-20
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the shortcomings of the existing technology such as complex production process, high equipment capacity requirements, inability to directly assemble production, and large differences in structure along the thickness direction of the steel plate.

Method used

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  • A high-strain steel plate for high-homogeneity l485 marine line pipe and its manufacturing method
  • A high-strain steel plate for high-homogeneity l485 marine line pipe and its manufacturing method
  • A high-strain steel plate for high-homogeneity l485 marine line pipe and its manufacturing method

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Embodiment Construction

[0037] Below by embodiment the present invention will be further described.

[0038] In the embodiment of the present invention, according to the component ratio of the technical solution, molten steel smelting→external refining→casting→slab reheating→controlled rolling→controlled cooling→heat treatment→air cooling to room temperature.

[0039] (1) Slab reheating: the thickness of the continuous casting slab is 250-300mm, the continuous casting slab is directly loaded and heated, the furnace loading temperature is not lower than 300°C, and the furnace temperature is controlled at 1160-1210°C;

[0040] (2) Controlled rolling: the temperature range for the start of rough rolling is 1050-1150°C, and the temperature range for the finish of rough rolling is 950-970°C; the cumulative deformation rate in the rough rolling stage ranges from 55% to 65%; The range is 850-900°C, and the finishing rolling temperature range is 800-850°C; the cumulative deformation rate in the finishing rol...

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Abstract

The invention provides a high-strain steel plate for high-homogeneity L485 marine line pipe and its manufacturing method. The composition of the steel plate is as follows by weight percentage: C 0.02%-0.08%, Si 0.10%-0.40%, Mn 1.40%-1.80% , Nb 0.02%~0.08%, V 0.01%~0.05%, Ti 0.01%~0.04%, Al 0.025%~0.045%, P≤0.010%, S≤0.005%, Cu 0.10%~0.50%, Mo 0.02~0.40 %, Cr 0.06% to 0.45%, Ni 0.10% to 0.50%, and the rest are Fe and unavoidable impurity elements. The manufacturing method includes molten steel smelting → out-of-furnace refining → casting → slab reheating → controlled rolling → controlled cooling → heat treatment → air cooling to room temperature; the application of the invention realizes the L485 high-homogeneity steel plate for marine pipes with excellent low-temperature toughness and high strain performance cost-effective production.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a high-strain steel plate for high-homogeneity L485 marine line pipe and a manufacturing method thereof. Background technique [0002] With the rapid development of the global economy, the consumption of oil and gas resources in various countries has increased sharply, and land resources have been gradually depleted, resulting in the focus of oil and gas exploitation shifting to the sea. As a country with a vast territorial sea, in order to safely and effectively utilize submarine oil and gas resources, especially deep-sea oil and gas resources, it is of great significance to develop steel materials for submarine oil and gas transportation. [0003] As we all know, the movement of ocean currents is complex and changeable, and the geological conditions of the seabed are harsh. Oil and gas pipelines serving under such working conditions need to have the characteristics of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58C21D8/02C21D1/20
CPCC21D1/20C21D8/0226C21D2211/002C21D2211/005C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58
Inventor 刘文月任毅张帅王爽高红
Owner ANGANG STEEL CO LTD
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