CN107716584B - Production method of super austenite 904L stainless steel plate strip - Google Patents
Production method of super austenite 904L stainless steel plate strip Download PDFInfo
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Abstract
The invention relates to a production method of a super austenite 904L stainless steel plate strip. A production method of a super austenitic 904L stainless steel strip comprises the following steps: and rolling the plate blank to form the stainless steel plate strip. The calendering treatment comprises the following steps: 1) heating the plate blank for the first time in a heating furnace; 2) carrying out primary pre-rolling treatment on the plate blank, wherein the rolling pass of the primary pre-rolling treatment is 3-5 passes, so that the thickness of the plate blank is rolled to 145-160 mm; 3) carrying out crack flaw detection and surface polishing treatment on the plate blank subjected to the first pre-rolling; 4) carrying out secondary heating on the plate blank in the heating furnace; 5) and performing secondary rolling treatment on the plate blank to enable the thickness of the plate blank to be rolled to the target thickness. Through the secondary rolling treatment of the super austenite 904L stainless steel plate strip, the produced super austenite 904L stainless steel plate strip is not cracked, and the product quality is excellent. The production method can greatly reduce the rolling force required during rolling of 904L, and ensures the stable rolling treatment of the super austenite 904L stainless steel plate strip.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a production method of a super austenite 904L stainless steel plate strip.
Background
Hot rolling refers to rolling a slab above the crystallization temperature of steel. Because the hot rolling energy consumption is lower, the metal plasticity is high, and the characteristics of improving the metal processing technological property are provided, the hot rolling is widely applied in the steel material production.
The 904L super austenitic stainless steel which is researched and developed belongs to low-carbon high-nickel and high-molybdenum austenitic stainless steel. Has good pitting corrosion resistance, crevice corrosion resistance and stress corrosion resistance in a neutral medium containing chloride ions, is suitable for sulfuric acid with various concentrations below 70 ℃, and can resist acetic acid with any concentration and any temperature under normal pressure. The corrosion resistance in the mixed acid of formic acid and acetic acid was also excellent. The application range is wide, for example, the method can be applied to petrochemical equipment, sulfuric acid storage, seawater heat exchangers and the like.
At present, 904L of super austenitic stainless steel strip is produced by referring to the production process of 304 stainless steel strip. However, in the 904L steel, the initial solidification is γ due to the high alloy content (Cr21% Ni25% Mo4.5%) and the Cr/Ni equivalence ratio is 1.5 or less, and the steel is susceptible to segregation and Crack. The concrete expression is that the hot rolling and rolling production has the following difficulties:
1) the rough rolling and rolling are easy to crack, and the main reasons are unreasonable cooling system, ingredient segregation, sigma phase (Mo) enrichment, and concentrated internal stress in the casting process. As shown in fig. 1, which is a schematic diagram of the prior 904L super austenitic rough rolling cracking.
The rolling force is basically 2 times of that of 316L steel grade under the same condition.
Disclosure of Invention
The invention provides a production method of a super austenite 904L stainless steel plate strip, which aims to solve the problems that the super austenite 904L stainless steel plate strip is easy to crack and has large rolling force during rough rolling.
In order to solve the technical problems, the invention adopts a technical scheme that: a production method of a super austenitic 904L stainless steel strip comprises the following steps:
carrying out steelmaking treatment in an electric furnace to form molten steel;
adjusting the components of the molten steel in a refining furnace;
stirring, deslagging and standing precipitation treatment are carried out on the molten steel;
carrying out steady flow treatment on the molten steel in a tundish, and carrying out continuous casting to form a plate blank;
performing calendaring treatment on the plate blank to form a stainless steel plate strip;
coiling the stainless steel plate strip to form a coiled stainless steel plate coil;
wherein the calendering treatment comprises the following steps:
1) heating the plate blank for the first time in a heating furnace;
2) carrying out primary pre-rolling treatment on the plate blank, wherein the rolling pass of the primary pre-rolling treatment is 3-5 passes, so that the thickness of the plate blank is rolled to 145-160 mm;
3) carrying out crack flaw detection and surface polishing treatment on the plate blank subjected to the first pre-rolling;
4) carrying out secondary heating on the plate blank in the heating furnace;
and performing secondary rolling treatment on the plate blank to form the super austenite 904L stainless steel plate strip, and rolling the plate blank to the target thickness of the super austenite 904L stainless steel plate strip. Specifically, in the calendering treatment, the temperature of a heating furnace is 1250-1270 ℃, and the first heating time and the second heating time of the plate blank in the heating furnace are both 200-240 min.
Specifically, the second rolling treatment of the slab comprises the following steps:
51) carrying out rough rolling treatment on the plate blank, wherein the rolling pass of the rough rolling treatment is 7 passes, so that the thickness of the plate blank is rolled to 23.5-28 mm;
52) and carrying out finish rolling treatment on the plate blank by a reversing steckel mill, wherein the rolling pass of the finish rolling treatment is 5-7 passes, so that the thickness of the plate blank is rolled to the target thickness.
Specifically, when the slab is subjected to finish rolling treatment by the reversing steckel mill, the temperature of the coil of the reversing steckel mill is 1020 ℃ to 1050 ℃.
Specifically, in the rolling treatment, the first pre-rolling treatment and the second rolling treatment of the plate blank are rolled in a non-descaling mode.
Specifically, the molten steel is subjected to component adjustment including decarburization treatment, desulfurization treatment, dephosphorization treatment, deleading treatment and reduction treatment in a refining furnace, and is subjected to all-Al deoxidation treatment, so that: c is less than 50ppm, S is less than 5ppm, P is less than 200ppm, and Pb is less than 50 ppm.
Specifically, in the operation of carrying out steady flow treatment on the molten steel in a tundish and carrying out continuous casting to form a plate blank, the temperature of the tundish is 1420-1435 ℃, the weak cooling water amount of secondary cooling water is 0.53L/Kg-0.51L/Kg, and the water cooling strengthening time is more than 30 min.
Specifically, the molten steel is subjected to full Ar denitrification treatment in the operations of stirring, deslagging and static precipitation treatment.
The scope of the present invention is not limited to the specific combinations of the above-described features, and other embodiments in which the above-described features or their equivalents are arbitrarily combined are also intended to be encompassed. For example, the above features and the technical features (but not limited to) having similar functions disclosed in the present application are mutually replaced to form the technical solution.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: through the secondary rolling treatment of the super austenite 904L stainless steel plate strip, the produced super austenite 904L stainless steel plate strip is not cracked, and the product quality is excellent. The production method can greatly reduce the rolling force required by the belt-pressing delay of the super austenite 904L stainless steel plate, and ensures the stable rolling treatment of the super austenite 904L stainless steel plate belt.
Drawings
FIG. 1 is a schematic diagram of a prior art 904L super austenite rough rolling cracking.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The defect component analysis is carried out on the phenomenon that the super austenite 904L stainless steel plate strip processed by the existing super austenite 904L stainless steel plate strip production process is easy to crack, and the sigma phase in the super austenite 904L stainless steel plate strip is found to be precipitated. Further improving the existing production method of the super austenite 904L stainless steel plate strip to form the production method of the super austenite 904L stainless steel plate strip.
The invention relates to a production method of a super austenite 904L stainless steel plate strip, which comprises the following steps:
carrying out steelmaking treatment in an electric furnace to form molten steel;
adjusting the components of the molten steel in a refining furnace;
stirring, deslagging and standing precipitation treatment are carried out on the molten steel;
carrying out steady flow treatment on the molten steel in a tundish, and carrying out continuous casting to form a plate blank with the thickness of 220 mm;
performing calendaring treatment on the plate blank to form a stainless steel plate strip;
the stainless steel strip is wound to form a stainless steel coil in a coil shape.
In the above production method, the molten steel is subjected to composition adjustment including decarburization treatment, desulfurization treatment, dephosphorization treatment, deleading treatment and reduction treatment in the refining furnace, and all-Al deoxidation treatment. The C in the molten steel is less than 50ppm by decarburization treatment. The S in the molten steel is less than 5ppm by desulfurization treatment. P in the molten steel is less than 200ppm by dephosphorization treatment. The Pb in the molten steel is less than 50ppm by deleading treatment.
In the production method, the molten steel is subjected to full Ar denitrification treatment in the operations of stirring, deslagging and static precipitation treatment.
In the production method, the molten steel is subjected to steady flow treatment in the tundish, and in the operation of forming the plate blank by continuous casting, the temperature of the tundish is 1420-1435 ℃, the weak cooling water amount of secondary cooling water is 0.53-0.51L/Kg, and the water cooling strengthening time is more than 30 min. Thus, the molten steel is brought to a high temperature state in the continuous casting equipment as much as possible by the weak cooling of the continuous casting, and the ferrite is prevented from being transformed into the sigma phase. When the casting blank is continuously cast, water cooling strengthening and water cooling time prolonging are carried out, so that ferrite quickly passes through a sigma phase forming temperature range (500-920 ℃). Thereby promoting complete austenitization of ferrite.
In the above production method, the calendering process includes the steps of:
1) heating the plate blank for the first time in a heating furnace, wherein the temperature of the heating furnace is 1250-1270 ℃, and the first heating time of the plate blank in the heating furnace is 200-240 min;
2) carrying out primary pre-rolling treatment, namely rough rolling, on the plate blank, wherein the initial thickness of the plate blank is 220mm, the rolling pass of the primary pre-rolling treatment is 3-5 passes, and the thickness of the plate blank is rolled to 145-160 mm by the primary pre-rolling treatment;
3) carrying out crack flaw detection and surface polishing treatment on the plate blank subjected to the first pre-rolling;
4) secondly heating the plate blank in a heating furnace, wherein the temperature of the heating furnace is 1250-1270 ℃, and the second heating time of the plate blank in the heating furnace is 200-240 min;
5) and performing secondary rolling treatment on the plate blank to form the super austenite 904L stainless steel plate strip, and rolling the plate blank to the target thickness of the super austenite 904L stainless steel plate strip.
The second calendering treatment of the plate blank comprises the following steps:
51) carrying out rough rolling treatment on the plate blank, wherein the rolling pass of the rough rolling treatment is 7 passes, so that the thickness of the plate blank is rolled to 23.5-28 mm;
52) and carrying out finish rolling treatment on the plate blank by a reversing steckel mill, wherein the rolling pass of the finish rolling treatment is 3-7 passes, so that the thickness of the plate blank is rolled to the target thickness.
When the slab is subjected to finish rolling treatment by the reversing steckel mill, the temperature of the coil furnace of the reversing steckel mill is 1020-1050 ℃. Because the plate blank needs to be threaded for many times when being rolled in the reversing steckel mill, the head and the tail of the plate blank in the shape of a plate strip need to be wound on a winding drum, if the temperature of the winding drum is lower than that of the plate blank, the temperature loss of the head and the tail of the plate blank is serious in the rolling process. In order to reduce the heat loss of the head and the tail of the plate blank caused by the coiling and reduce the rolling load of the head and the tail of the plate blank, the embodiment adopts a method for increasing the temperature of the coiling furnace, namely setting the original internal temperature of the coiling furnace to be 980 ℃ and 1050 ℃ for the 904L stainless steel plate strip, so that the coiling temperature can be increased, and further the stable rolling of the super austenite 904L stainless steel plate strip can be realized.
In the rolling treatment, because the alloy content of the plate blank is high and the surface scale is less, in order to reduce the rolling heat loss and reduce the rolling load, the first pre-rolling treatment and the second rolling treatment of the plate blank are rolled in a descaling-free mode.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (1)
1. A production method of a super austenite 904L stainless steel plate strip is characterized by comprising the following steps:
carrying out steelmaking treatment in an electric furnace to form molten steel;
performing component adjustment on the molten steel in a refining furnace, wherein the component adjustment on the molten steel in the refining furnace comprises decarburization treatment, desulfurization treatment, dephosphorization treatment, deleading treatment and reduction treatment, and performing all-Al deoxidation treatment, so that: c is less than 50ppm, S is less than 5ppm, P is less than 200ppm, Pb is less than 50 ppm;
stirring, deslagging and static precipitation treatment are carried out on the molten steel, and full Ar denitrification treatment is carried out during the stirring, deslagging and static precipitation treatment operations of the molten steel;
performing steady flow treatment on molten steel in a tundish, performing continuous casting to form a plate blank, performing steady flow treatment on the molten steel in the tundish, and performing continuous casting to form the plate blank, wherein the temperature of the tundish is 1420-1435 ℃, the weak cooling water amount of secondary cooling water is 0.53L/Kg-0.51L/Kg, and the water cooling strengthening time is more than 30 min;
performing calendaring treatment on the plate blank to form a stainless steel plate strip;
coiling the stainless steel plate strip to form a coiled stainless steel plate coil;
wherein the calendering treatment comprises the following steps:
1) heating the plate blank for the first time in a heating furnace, wherein the temperature of the heating furnace is 1250-1270 ℃, and the first heating time is 200-240 min;
2) carrying out primary pre-rolling treatment on the plate blank, and carrying out rolling on the primary pre-rolling treatment of the plate blank in a non-descaling mode, wherein the rolling pass of the primary pre-rolling treatment is 3-5 passes, so that the thickness of the plate blank is rolled to 145-160 mm;
3) carrying out crack flaw detection and surface polishing treatment on the plate blank subjected to the first pre-rolling;
4) secondly heating the plate blank in a heating furnace, wherein the temperature of the heating furnace is 1250-1270 ℃, and the second heating time is 200-240 min;
5) performing secondary rolling treatment on the plate blank to form a super austenite 904L stainless steel plate strip, and performing rolling on the plate blank in a descaling mode to enable the thickness of the plate blank to be rolled to the target thickness of the super austenite 904L stainless steel plate strip;
the second calendering treatment of the plate blank comprises the following steps:
51) carrying out rough rolling treatment on the plate blank, wherein the rolling pass of the rough rolling treatment is 7 passes, so that the thickness of the plate blank is rolled to 23.5-28 mm;
52) and carrying out precision rolling treatment on the plate blank by a reversing steckel mill, wherein the temperature of a rolling furnace of the reversing steckel mill is 1020-1050 ℃, and the rolling pass of the precision rolling treatment is 5-7, so that the plate blank is rolled to the target thickness.
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| CN111389914B (en) * | 2020-03-02 | 2022-03-25 | 北京鼎新时代科技有限公司 | Production method of super austenite 904L stainless steel plate strip |
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| CN103966516A (en) * | 2014-04-28 | 2014-08-06 | 宝钢不锈钢有限公司 | Low-cost stainless steel for tail gas purification system and manufacturing method of low-cost stainless steel |
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