Method for reducing surface defect of stainless steel continues casting blank

A technology for stainless steel and continuous casting slabs, applied in the field of reducing surface defects of stainless steel continuous casting slabs, to achieve the effects of improving pass rate, avoiding metal loss and reducing defects

Active Publication Date: 2010-01-27
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the above-mentioned shortcomings of existing methods for reducing surface defects of stainless steel continuous casting slabs, the present invention provides a method for reducing surface defects of stainless steel continuous casting slabs, which can sig

Method used

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  • Method for reducing surface defect of stainless steel continues casting blank
  • Method for reducing surface defect of stainless steel continues casting blank

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0039] Embodiment one

[0040] Date: July 31, 2008.

[0041] Production process: 160-ton electric arc furnace → 180-ton AOD furnace → argon blowing station → vertical bending continuous casting machine

[0042] Continuous casting slab specification: 200(thickness)×1535(width)mm

[0043] The composition of molten steel from a 160-ton electric arc furnace is as follows:

[0044] C: 1.67% Si 0.21% P 0.017% S 0.021% Mn 0.24% Cr 12.69%

[0045] N 0.022% Ti 0.01% Al 0.02% The balance is iron and unavoidable impurities.

[0046] Time Processing content

[0047] 14:20 Transfer molten steel to AOD for treatment, AOD furnace lining has been used 52 times.

[0048] 15:16 After the molten steel is treated in AOD, the slag basicity (CaO / SiO 2 ) is 1.72. The mass percentage of molten steel composition meets the requirements of Table 2:

[0049] Table 2

[0050]

[0051] Note: The balance is iron. Melting point: 1506°C.

[0052] 15:25 The molten steel arrives at the argon blowi...

Example Embodiment

[0059] Embodiment two,

[0060] Steel type: 00Cr12

[0061] Production date: January 2, 2008

[0062] Production process flow: 90 top-bottom combined blowing converter → 90 VOD (vacuum blowing oxygen decarburization refining furnace) → LF furnace (ladle refining furnace) → vertical bending continuous casting machine

[0063] Continuous casting slab specification: 220(thickness)×1235(width)mm

[0064]The molten steel composition of the 90 top-bottom compound blowing converter is as follows:

[0065] C: 0.18% Si 0.11% P 0.015% S 0.006% Mn 0.47% Cr 11.88%

[0066] N 0.020% Ti 0.01% Al 0.01% The balance is iron and unavoidable impurities

[0067] Time Processing content

[0068] 2:24 The molten steel is treated with 90 tons of VOD, and the VOD ladle lining has been used 11 times.

[0069] 3:20 After the molten steel is treated in VOD, the basicity of the slag (CaO / SiO 2 ) is 1.84. The mass percent of molten steel composition is shown in Table 4:

[0070] Table 4

[0071]...

Example Embodiment

[0077] Embodiment three,

[0078] Steel type: 0Cr18Ni9

[0079] Production date: July 17, 2008

[0080] Production process: 160 electric furnace → 180AOD furnace → argon blowing station → vertical bending continuous casting machine

[0081] Continuous casting slab specification: 200(thickness)×1280(width)mm

[0082] The composition of molten steel from a 160-ton electric furnace is as follows:

[0083] C: 1.77% Si 0.18% P 0.028% S 0.017% Mn 0.97% Cr 17.14%

[0084] Ni 7.92% N 0.031% Ti 0.01% Al 0.01% The balance is iron and unavoidable impurities

[0085] Time Processing content

[0086] 16:18 The molten steel is processed by AOD, and the AOD lining has been used 122 times.

[0087] 17:20 After the molten steel is treated in AOD, the basicity of slag (CaO / SiO 2 ) is 1.68. The mass percentages of molten steel components are shown in Table 5.

[0088] table 5

[0089]

[0090] Note: The balance is iron. Melting point: 1460°C

[0091] At 17:28, the molten steel arr...

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Abstract

The invention discloses a method for reducing a surface defect of stainless steel continues casting blank. The casting block meets the following requirement: when Ti is larger than and equal to 0 and is less than and equal to 0.1%, S is less than and equal to 0.08%, and Si is larger than and equal to 0.358%, or Si is less than 0.35%, aluminum content is 0.01-0.03%. An adaptive produce flow procedure is as follows: an electric furnace, an induction furnace or a revolving furnace-AOD furnace refining or VOD furnace refining-an argon flushing station or an LF furnace refining-continuously casting; and an AOD furnace or VOD steel ladle is at least used at once. The method comprises the following steps of: 1 adding liquid steel smelted from the electric furnace, the induction furnace or the revolving furnace into the AOD furnace or the VOD furnace to be refined; 2 argon flushing and stirring the liquid steel in steel ladle, wherein flushing and stirring tine is larger than and equal to 10 minutes, and the liquid steel can not be exposed to the air during stirring; and 3 putting the steel ladle into a continues casting machine, automatically opening the steel ladle, and forbidding opening water gap by means of oxygen blowing, wherein the technical requirement during continuously casting is as followings: continuous casting speed is larger than and equal to 1.0m/min, the fluctuation of the casting speed is not larger than +/-0.02m/min, casting negative slip time is lees than and equal to 0.20 seconds, and the liquid surface fluctuation of a crystallizer is not larger than +/-5m. The method obviously reduces the surface defect of the stainless steel continues casting blank with titanium content which is not larger than 0.10%.

Description

technical field [0001] The invention relates to a method for reducing surface defects of stainless steel continuous casting slabs, in particular, a method for reducing surface defects of stainless steel continuous casting slabs containing no more than 0.10% titanium. Background technique [0002] Stainless steel is the abbreviation or collective name of stainless steel and acid-resistant steel. It refers to a type of iron-based alloy that contains more than 10.5% chromium and can resist corrosion in air, fresh water or chemically corrosive media. The existing stainless steel continuous casting slab preparation process Due to unstable operation, equipment failure and unreasonable control of process parameters, there are generally serious defects on the surface or under the skin of stainless steel continuous casting slabs, such as cracks, inclusions, depressions, etc. These defects are difficult to find, or under actual production conditions, Unable to find out etc. Therefore...

Claims

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Application Information

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IPC IPC(8): B22D11/16B22D1/00C21C7/072C21C7/10
Inventor 刘承志王贺利
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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