Heat-resistant pressure vessel steel plate for furnace shell and manufacturing method thereof

A technology for pressure vessels and steel plates, which is applied in the field of heat-resistant pressure vessel steel plates for furnace shells and their manufacturing fields, can solve problems such as excess strength, and achieve the effects of stable performance, moderate steel strength and high safety factor.

Inactive Publication Date: 2017-03-29
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, even in the event of overload, the strength still has a lot of margin

Method used

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  • Heat-resistant pressure vessel steel plate for furnace shell and manufacturing method thereof
  • Heat-resistant pressure vessel steel plate for furnace shell and manufacturing method thereof
  • Heat-resistant pressure vessel steel plate for furnace shell and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The heat-resistant pressure vessel steel plate for the furnace shell in this example is prepared from the following components in mass percentage: C: 0.18%, Si: 0.15%, Mn: 0.75%, P: 0.015%, S: 0.003%, Mo : 0.28%, Alt: 0.032%, the rest is Fe and unavoidable impurities.

[0021] The production preparation method of the heat-resistant pressure vessel steel plate for the furnace shell of the present embodiment is as follows:

[0022] 1) Smelting process: After the raw material molten iron is pretreated by KR, it is smelted in a 210t top-bottom combined blowing converter. After the converter is tapped, the ladle is blown with argon for 15 minutes and fed to the aluminum wire for deoxidation treatment. The molten steel is sent to the LF refining furnace for refining, and the temperature and composition are adjusted After the fine-tuning treatment, the vacuum treatment is carried out in the RH furnace. The vacuum time is 18 minutes. After the treatment, 2m / t of calcium iron wi...

Embodiment 2

[0028] The production and preparation method of the heat-resistant pressure vessel steel plate for the furnace shell in this embodiment, the thickness of the rolled intermediate billet is 110mm, the finish rolling temperature is 820°C, water cooled to 630°C and then air-cooled to room temperature, the finished rolled steel plate has a specification of 50mm, The normalizing temperature is 903°C and the furnace time is 75 minutes.

[0029] All the other features are the same as in Example 1.

Embodiment 3

[0031] The production and preparation method of the heat-resistant pressure vessel steel plate for the furnace shell in this embodiment, the steel is prepared from the following mass percentage components: C: 0.19%, Si: 0.27%, Mn: 0.82%, P: 0.014%, S: 0.002%, Mo: 0.30%, Alt: 0.030%, and the rest are Fe and unavoidable impurities.

[0032]After the converter is tapped, the ladle is blown with argon for 10 minutes, and the molten steel is vacuum treated by the RH furnace, and the vacuum is kept for 15 minutes. After the treatment, calcium iron wire is fed at 2.2m / t. After the wire is fed, the argon is blown softly for 20 minutes. About 120mm; the superheat of the tundish fluctuates in the range of 12-25°C, the heating time of the continuous casting billet in the heating furnace is 3 hours and 50 minutes, the thickness of the intermediate billet is 150mm, the finishing rolling temperature is 830°C, water cooling to 635°C and then air cooling to room temperature , The specificatio...

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Abstract

The invention relates to the technical field of manufacturing of steel plates of thermal-pressure-resistant containers, in particular to a steel plate of a thermal-pressure-resistant container used for a furnace shell and a manufacturing method of the steel plate. The steel plate is prepared from, by mass, 0.12-0.20% of C, 0.10-0.35% of Si, 0.50-0.90% of Mn, 0-0.020% of P, 0-0.005% of S, 0.25-0.35% of Mo, 0.020-0.050% of Alt and the balance Fe and inevitable residual elements. The carbon equivalent of the steel plate is smaller than or equal to 0.43%. The steel plate can be applicable to the environment with the working temperature as high as 500 DEG C and cope with challenges of bad conditions such as high temperature, mechanical shock and thermal stress. In addition, the function of improving the high-temperature performance of steel through the Mo element is brought into play ingeniously, and therefore the steel is still excellent in strength and hardness at a high temperature and can further meet the using requirements in various application fields. The steel plate is stable in performance, high in safety coefficient, low in cost and can also be applied to the field of nuclear power pressure container construction.

Description

technical field [0001] The invention relates to the technical field of manufacturing steel plates for heat-resistant pressure vessels, in particular to a heat-resistant pressure vessel steel plate for furnace shells and a manufacturing method thereof. Background technique [0002] The furnace shells of various heat-resistant industrial furnace equipment such as blast furnaces, hot blast furnaces, converters, coal gasifiers, and coke ovens are usually steel shells lined with refractory materials. There is an extremely complex interaction with refractory materials, so the selection of materials such as furnace shell steel is particularly critical. However, there has been no special design standard as a reference for the selection of such steel grades for a long time. With the rapid development of industrial scale at home and abroad, the demand for this type of steel plate is also increasing. According to the actual experience and research results of some steel mills, the stee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C21D8/02
Inventor 邵正伟成小龙刘金泉冯勇
Owner SHANDONG IRON & STEEL CO LTD
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