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Production method of heavy-gauge large-single-weight low-alloy high-strength structural steel plates

A technology for structural steel plates and production methods, applied in metal rolling, process efficiency improvement, furnace types, etc., can solve problems such as inability to meet needs and internal quality requirements, and achieve rich control of rolling process theory, reduce process and shorten the construction period

Inactive Publication Date: 2014-01-29
WUYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The number of high-quality alloy steel and special alloys required by modern industrial production is increasing day by day, and the quality and performance requirements of metal materials are constantly improving, especially in construction machinery, nuclear power, pressure vessels, military industry, high-quality molds and other high-quality steel plates with large thickness and single weight. Higher requirements are put forward for the mechanical properties, welding properties and Z-direction properties of steel, but ordinary smelting and casting methods cannot meet the needs, especially in terms of internal quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The thickness of the large thickness Q345D-Z25 steel plate for large heavy machinery of the present embodiment is 410mm, and the compression ratio is 2.34, and the production steps of this steel plate are as follows:

[0023] (1) Smelting: The molten steel is first smelted in an electric furnace, and then sent to an LF refining furnace for refining. When the temperature of the molten steel reaches 1570°C, it is transferred to a vacuum degassing furnace (VD furnace) for vacuum treatment; CaSi blocks are added before the vacuum to spheroidize inclusions, The vacuum degree is not greater than 66Pa, and the vacuum is broken when the vacuum holding time is 20 minutes;

[0024] (2) Casting: casting the molten steel after smelting, adopting continuous casting production, superheating degree is 23°C, casting speed is 1.20m / min, and the total water intake of the secondary cooling water is guaranteed to meet 1400L / min;

[0025] (3) Electroslag remelting: the cast slab is made int...

Embodiment 2

[0035] The thickness of the large-thickness Q390C steel plate used for large-scale cement equipment in this embodiment is 265mm, and the compression ratio is 2.64. The production steps of the steel plate are as follows:

[0036] (1) Smelting: The molten steel is first smelted in an electric furnace, and then sent to an LF refining furnace for refining. When the temperature of the molten steel reaches 1569°C, it is transferred to a vacuum degassing furnace (VD furnace) for vacuum treatment; CaSi blocks are added before the vacuum to spheroidize inclusions, The vacuum degree is not greater than 66Pa, and the vacuum is broken when the vacuum holding time is 20 minutes;

[0037] (2) Casting: cast the molten steel after smelting; the electroslag remelting raw material is produced by continuous casting, the superheat is 23°C, the casting speed is 1.15m / min, and the total water intake of the secondary cooling water is guaranteed to meet 1400L / min;

[0038] (3) Electroslag remelting: ...

Embodiment 3

[0048] The thickness of the large thickness Q460C steel plate used for the large-scale press crankshaft stand of the present embodiment is 165mm, and the compression ratio is 4.24. The production method of this steel plate is as follows:

[0049] (1) Smelting: The molten steel is first smelted in an electric furnace, and then sent to the LF refining furnace for refining. When the temperature of the molten steel reaches 1568°C, it is transferred to a vacuum degassing furnace (VD furnace) for vacuum treatment; CaSi blocks are added before vacuum, and inclusions are spheroidized. The vacuum degree is not greater than 66Pa, and the vacuum is broken when the vacuum holding time is 20 minutes;

[0050] (2) Casting: cast the molten steel after smelting, adopt continuous casting production, the superheat degree is 22°C, the casting speed is 1.10m / min, and ensure that the total water intake of the secondary cooling water meets 1400L / min;

[0051] (3) Electroslag remelting: the cast sla...

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Abstract

The invention provides a production method of heavy-gauge large-single-weight low-alloy high-strength structural steel plates. The method comprises the steps of smelting, casting, electroslag remelting, electroslag ingot cleaning, heating, rolling, water cooling, hydrogen diffusion treatment, supersonic wave flaw detection, normalization, examination and warehousing. The largest thickness of the steel plates produced through the method of the invention can reach 410mm. The method allows the isotropy, the impact toughness and the Z-directional performances of the heavy-gauge steel plates to be realized through adopting large slab electroslag remelting treatment and a reasonable controlled rolling and heat treatment technology, the production cost to be reduced, the time of delivery to be substantially shortened and the specification range to be wide, and is used for satisfying continuously increased market application amount demands; and the steel plates can completely substitute import products to satisfy various requirements of heavy-gauge large-single-weight steel plates applied to water power, wind power and large building structures.

Description

technical field [0001] The invention relates to a production method of a large-thickness, large-unit-weight, low-alloy, high-strength structural steel plate, belonging to the field of low-alloy, high-strength steel plate manufacturing. Background technique [0002] The number of high-quality alloy steel and special alloys required by modern industrial production is increasing day by day, and the quality and performance requirements of metal materials are constantly improving, especially in construction machinery, nuclear power, pressure vessels, military industry, high-quality molds and other high-quality steel plates with large thickness and single weight. Higher requirements are put forward for the mechanical properties, welding properties and Z-direction properties of steel, but ordinary smelting and casting methods cannot meet the needs, especially in terms of internal quality. After adopting electroslag remelting, the structure is dense, the steel is clean, and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52C22B9/18C21D1/28C21D9/00B21B1/22
CPCY02P10/20
Inventor 谢良法赵文忠韦明李建立张亚丽桑德广张仪杰王全胜毕殿阁温斌
Owner WUYANG IRON & STEEL
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