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Production method of NR400ZL steel plates used for equipment converter shells

A production method and steel plate technology, applied in the field of metallurgy, can solve problems such as increased production difficulty and difficulty in meeting market demand, and achieve the effects of improving billet quality, component control accuracy, excellent internal quality, and good welding performance

Inactive Publication Date: 2019-07-02
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the thickness of the steel plate increases, it will inevitably lead to an increase in the difficulty of production. It is difficult to meet the market demand with traditional production methods.

Method used

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  • Production method of NR400ZL steel plates used for equipment converter shells
  • Production method of NR400ZL steel plates used for equipment converter shells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The thickness of the NR400ZL steel plate used for the furnace shell of the equipment in this embodiment is 60mm, and its chemical composition and mass percentage are shown in Table 1.

[0022] The production method of the NR400ZL steel plate for the equipment furnace shell of this embodiment includes steelmaking, continuous casting, heating, rolling and heat treatment processes, and the specific process steps are as follows:

[0023] (1) Steelmaking process: During the converter steelmaking process, the ladle baking temperature is 1000°C, the molten steel C: 0.06% when tapping, the tapping temperature is 1560°C, and pre-deoxidation is carried out in the ladle after tapping; LF refining ensures blowing The Ar is good, the retention time of white slag is 25 minutes, and the aluminum content of the slag sample is 0.020%; after the VD refining is completed, the vacuum is softly blown for 10 minutes;

[0024] (2) Continuous casting process: the superheat of continuous castin...

Embodiment 2

[0030] The thickness of the NR400ZL steel plate used for the furnace shell of the equipment in this embodiment is 80mm, and its chemical composition and mass percentage are shown in Table 1.

[0031] The production method of the NR400ZL steel plate for the equipment furnace shell of this embodiment includes steelmaking, continuous casting, heating, rolling and heat treatment processes, and the specific process steps are as follows:

[0032] (1) Steelmaking process: During the converter steelmaking process, the ladle baking temperature is 1020°C, the molten steel C: 0.07% when tapping, the tapping temperature is 1600°C, and pre-deoxidation is carried out in the ladle after tapping; LF refining ensures blowing The Ar is good, the retention time of white slag is 35 minutes, and the aluminum content of the slag sample is 0.015%; VD refining is completed and vacuum is blown for 5 minutes;

[0033] (2) Continuous casting process: The superheat of continuous casting is 15°C. During c...

Embodiment 3

[0039] The thickness of the NR400ZL steel plate used for the furnace shell of the equipment in this embodiment is 120mm, and its chemical composition and mass percentage are shown in Table 1.

[0040] The production method of the NR400ZL steel plate for the equipment furnace shell of this embodiment includes steelmaking, continuous casting, heating, rolling and heat treatment processes, and the specific process steps are as follows:

[0041] (1) Steelmaking process: During converter steelmaking, ladle baking temperature is 1050°C, molten steel C: 0.08% when tapping, tapping temperature is 1570°C, pre-deoxidation is carried out in ladle after tapping; LF refining ensures blowing Ar is good, the retention time of white slag is 30 minutes, and the aluminum content of the slag sample is 0.017%; VD refining is completed and then softly blown for 7 minutes after vacuum;

[0042] (2) Continuous casting process: the superheat of continuous casting is 20°C, protective casting is used d...

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Abstract

The invention discloses a production method of NR400ZL steel plates used for equipment converter shells. The production method comprises the procedures including steel-making, continuous casting, heating, rolling and heat treatment. According to the production method, by limiting the contents of the element components of C and Si, by controlling the steel ladle baking temperature and C content ofthe converter steel making process and controlling the white slag holding time and vacuum soft blowing time of the LF refining process, by adopting protective casting and controlling the steel plate rolling process and return-red temperature, the obtained steel plates are good in compactness, high in strength and good in welding performance, the steel plate thickness is 60-160 mm, the steel plateyield strength is greater than or equal to 320 MPa, the tensile strength is greater than or equal to 420 MPa, the ductility is greater than or equal to 24%, 0 DEG C impact force is greater than or equal to 60 J, the 350 DEG C high-temperature tensile strength is greater than or equal to 230 MPa, standards and safety requirements are met completely, and the production method meets requirements forsteel used for the equipment converter shells.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method of NR400ZL steel plates for equipment furnace shells. Background technique [0002] NR400ZL steel plate is a new type of converter shell plate, which has high high temperature strength and creep resistance, and is widely used by more and more people. The market demand for this kind of steel plate is increasing. [0003] With the enlargement of converter equipment and the increase of smelting requirements, the strength level of the steel plate during design is significantly higher than the standard, and the thickness of the steel plate is also increasing. As the thickness of the steel plate increases, the difficulty of production will inevitably increase. It is difficult to meet the market demand with traditional production methods. [0004] In summary, the further development of the production method of high-performance NR400ZL steel plate is o...

Claims

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Application Information

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IPC IPC(8): C22C33/04B22D11/11C21D1/28C21D6/00C21D8/02C21D9/00C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
CPCB22D11/11C21D1/28C21D6/005C21D6/008C21D8/0221C21D9/0081C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 李杰赵国昌王甜甜龙杰庞辉勇李劲峰瞿征尹卫江丁文科
Owner WUYANG IRON & STEEL
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