CN113355496B - On-line solution annealing process for rolling waste heat of stainless steel hot-rolled coil - Google Patents
On-line solution annealing process for rolling waste heat of stainless steel hot-rolled coil Download PDFInfo
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- CN113355496B CN113355496B CN202110625167.7A CN202110625167A CN113355496B CN 113355496 B CN113355496 B CN 113355496B CN 202110625167 A CN202110625167 A CN 202110625167A CN 113355496 B CN113355496 B CN 113355496B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
Abstract
The invention discloses an online solution annealing process for rolling waste heat of a stainless steel hot-rolled coil, which fully utilizes the rolling waste heat and has the characteristics of energy conservation and emission reduction. The main production process flow comprises the following steps: heating a continuous casting billet → removing phosphorus by high-pressure water → rough rolling → finish rolling → coiling by a hot coil furnace. The invention adopts the hot coil furnace to replace the annealing furnace with the length of dozens of meters or even hundreds of meters in the conventional annealing and pickling process, and the hot rolling process and the annealing and pickling process are connected by the hot coil furnace. The hot rolling furnace is provided with an upper rolling station and a lower rolling station, has the functions of heat supplementing and heat preservation, and can eliminate the structure hardening and the fibrosis of a deformed austenitic stainless steel hot band so as to fully dissolve carbide. The invention fully utilizes the rolling waste heat and has the technical advantages of short flow, high production efficiency and the like.
Description
Technical Field
The invention belongs to the field of stainless steel heat treatment production processes, and relates to a solution annealing treatment process for a stainless steel hot-rolled coil.
Background
The austenitic stainless steel accounts for about 70 percent of the whole stainless steel yield, and is the product with the largest steel variety and the largest usage amount in stainless steel products. Austenitic stainless steels are widely used in the chemical industry, petroleum refining industry, paper and pulp industry, synthetic resin industry, fertilizer industry, food industry and medical, tableware and other fields. The austenitic stainless steel sheet is subjected to solution treatment after rolling, and cannot be directly delivered in a hot rolled state. At present, the solution treatment of austenitic stainless steel hot rolled coils adopts an off-line mode, and the main purpose is to completely and uniformly dissolve carbide and various alloy elements in austenite, then cool the austenite, inhibit the precipitation of the carbide, improve the corrosion resistance of the stainless steel, soften the structure and eliminate the work hardening.
Since the first successful development and application of accelerated cooling systems (named OLAC) after heavy and medium plate mills in 1980 in japan, the on-line heat treatment process has been applied gradually in the steel industry. The on-line heat treatment of carbon steel and alloy steel can utilize internal structure hardening caused by working deformation to improve the toughness of products, but is obviously different from austenitic stainless steel. The solution treatment is directly carried out after the stainless steel is processed and deformed, hardened structures or fibrous structures generated by deformation are difficult to eliminate, the hardness of products exceeds the standard and the anisotropy can be caused, and particularly for a stainless steel hot band, the deformed structures are hardened and fiberized more seriously due to the large deformation compression ratio. For the reasons, the stainless steel hot rolled coil is subjected to solution annealing treatment in an off-line mode for a long time, the hot rolled steel coil needs to be cooled to room temperature, then is uncoiled and enters an annealing furnace to be reheated to the solution annealing temperature, and therefore energy consumption is high and the production period is long.
Disclosure of Invention
In order to solve the problem that the stainless steel hot-rolled coil in the prior art can not be subjected to solution treatment in an online manner, the invention provides an online solution annealing process for the rolling waste heat of the stainless steel hot-rolled coil, which fully utilizes the rolling waste heat, eliminates the structure hardening and fibrosis of deformed austenite and realizes the online solution annealing treatment of an austenitic stainless steel hot band.
In order to achieve the purposes of saving energy, reducing consumption, reducing cost and improving efficiency, the invention adopts the main technical scheme that: the hot coil furnace is adopted to replace an annealing furnace with the length of dozens of meters or even hundreds of meters in the conventional annealing and pickling process, the hot rolling process and the pickling process are connected through the hot coil furnace, and a small amount of heat supplement and heat preservation are carried out on a steel strip in the hot coil furnace to complete the solution annealing process.
The specific technical scheme is as follows:
an online solution annealing process for rolling waste heat of a stainless steel hot-rolled coil utilizes the rolling waste heat to heat a coil furnace after a hot rolling procedure, and the whole procedure does not comprise an annealing furnace; the hot coil furnace is provided with two coiling stations vertically distributed up and down, and natural gas or coal gas is adopted to perform heat supplementing and heat preservation on the steel coil until the solution annealing temperature is reached.
The process comprises the following steps: heating a continuous casting billet → removing phosphorus by high-pressure water → rough rolling → finish rolling → coiling by a hot coil furnace.
When the online solution treatment annealing process for the rolling waste heat of the stainless steel hot-rolled coil is applied to the online solution treatment annealing pickling process flow of the rolling waste heat of the compact stainless steel hot-rolled coil, in order to realize the capacity matching of the rolling process and the solution treatment annealing process, the production is discharged in a cross mode, a hot coil furnace is arranged at the downstream of a coiler, and the coiler is positioned at the downstream of a laminar cooling area;
and a part of billets adopt the rolling waste heat on-line solution annealing process, and the laminar flow header after the rolling mill is kept in a closed state in the process. The specific process is as follows: (1) heating a stainless steel continuous casting billet by a heating furnace, then preserving heat, removing phosphorus by high-pressure water after discharging, removing iron oxide scales on the surface, and then obtaining the target thickness and the target finish rolling temperature required by the process after rough rolling and finish rolling for multiple passes; (2) the rolled steel strip directly passes through a laminar cooling area and a coiling machine and enters a hot coiling furnace arranged at the downstream of the coiling machine to be coiled into a steel coil, the high-temperature steel coil is heated in the hot coiling furnace to a solution annealing temperature, and the temperature is kept for a period of time, so that carbide is fully dissolved, and the deformation hardened tissue is fully softened; (3) after a steel coil in the hot coil furnace is uncoiled, straightening is carried out, then the steel coil is rapidly cooled to be below 300 ℃, an irregular head part of the cooled steel strip is cut off and is welded with the tail part of a preorder steel strip, and buffering of materials in the welding process is realized through a loop; (4) and after being descaled, shot-blasted and passivated by acid washing, the steel strip enters a coiling machine to be coiled into a finished steel coil.
In the step (3), preferably, the cooling process after the hot rolling furnace adopts gas mist cooling or water jet cooling.
The other part of the steel billet adopts a conventional annealing and pickling process, the laminar flow header is kept in an open state in the process, the finish-rolled steel strip is cooled in a laminar flow cooling area, coiled by an underground coiler and subjected to the following procedures: uncoiling → pinch straightening → head and tail shearing → welding → annealing → cooling to room temperature → crushing the scale → shot blasting → acid washing → coiling.
When the online solution treatment annealing process of the rolling waste heat of the stainless steel hot-rolled coil is applied to the technological processes of online solution treatment and offline pickling of the rolling waste heat of the stainless steel hot-rolled coil, the hot coil furnace is directly arranged behind the finishing mill group, and the specific process comprises the following steps: (1) heating a stainless steel continuous casting billet by a heating furnace, then preserving heat, removing phosphorus by high-pressure water after discharging, removing iron oxide scales on the surface, and then obtaining the target thickness and the target finish rolling temperature required by the process after rough rolling and finish rolling for multiple passes; (2) the rolled high-temperature steel strip enters a hot coil furnace arranged at the downstream of the finishing mill group to be coiled into a steel coil, the high-temperature steel coil is reheated in the hot coil furnace to the solution annealing temperature, and the temperature is preserved for a period of time, so that carbide is fully dissolved, and the deformation hardened tissue is fully softened; (3) and (3) uncoiling a steel coil in a hot coil furnace, carrying out pinch straightening, entering a post-rolling cooling area, rapidly cooling to below 300 ℃, and then entering an underground coiler to coil the steel coil. Preferably, the rapid cooling adopts a high-pressure jet flow water spray cooling mode; (4) the steel coil cooled to room temperature is conveyed to an annealing and pickling line and is subjected to the working procedures of uncoiling → pinch straightening → head and tail shearing → welding → scale breaking → shot blasting → pickling → coiling and the like. And (4) performing scale breaking, shot blasting and acid washing, wherein the annealing furnace and the cooling equipment are kept in an empty state.
Preferably, in the step (1), the steel strip finish rolling target temperature is maintained above 950 ℃.
Preferably, in the step (2), the hot coil furnace is used for supplementing heat to the optimal solid solution temperature of 950-1150 ℃, and the heat preservation time is 2-5 min.
The invention has the beneficial effects that:
(1) the waste heat temperature after the plate is rolled is utilized to directly carry out solution annealing treatment, so that the production energy consumption is saved by over 60 percent, the national energy can be greatly saved, and the production emission is reduced;
(2) the heating time of the steel strip solution annealing in the furnace is obviously reduced by utilizing the rolling waste heat, the production period of the stainless steel hot rolled coil product can be reduced to within 1 hour from the original more than 24 hours, the production efficiency is improved, and the production period of the product is greatly shortened.
Drawings
FIG. 1 is an online annealing and pickling process flow of rolling waste heat of a compact stainless steel hot rolled coil;
FIG. 2 is a process flow of on-line annealing and off-line acid washing of rolling waste heat of a stainless steel hot rolled coil.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present embodiments of the invention, which are illustrated in the accompanying drawings.
Example 1 (compact stainless steel hot rolled coil rolling waste heat online annealing pickling process):
as shown in fig. 1, the method comprises the following steps:
(1) heating a 304 austenitic stainless steel slab with the thickness of 220mm and the width of 1250mm to 1250 ℃ in a heating furnace, preserving heat for 3.5 hours, and discharging the slab out of the furnace; removing phosphorus from a steel billet from a heating furnace by high-pressure water, rough rolling and finish rolling, and rolling the steel billet into a hot band with the specification of 4.0mm multiplied by 1250m, wherein the finish rolling temperature is about 950 ℃;
(2) and the rolled steel strip directly passes through the laminar cooling area and the coiler and enters a hot coil furnace arranged at the downstream of the coiler to be coiled into a steel coil. Keeping the laminar flow header in a closed state, keeping the temperature of a steel strip at the inlet of the hot rolling furnace to be about 850 ℃, supplementing heat of a high-temperature steel coil in the hot rolling furnace to the solution annealing temperature of 1050 ℃, and keeping the temperature for 3 minutes; under the condition that a hot rolling furnace has no idle work station, the rolled steel strip passes through a laminar cooling area and then enters an underground coiler for coiling, and then annealing and pickling treatment is carried out in a conventional off-line mode.
(3) After the steel coil in the hot coil furnace is uncoiled, straightening is carried out, and then the steel coil enters a cooling area to be rapidly cooled to room temperature;
(4) cutting off an irregular head part of the cooled steel strip, and welding the head part with the tail part of the preorder steel strip;
(5) and (4) after the welded steel strip is subjected to scale breaking, shot blasting and acid pickling passivation, feeding the steel strip into a coiling machine to be coiled into a commodity coil.
Example 2 (rolling waste heat on-line annealing and off-line pickling process for stainless steel hot rolled coil):
as shown in fig. 2, the method comprises the following steps:
(1) heating a 304 austenitic stainless steel slab with the thickness of 220mm and the width of 1250mm to 1250 ℃ in a heating furnace, preserving heat for 3.5 hours, and discharging; removing phosphorus from a steel billet from a heating furnace by high-pressure water, rough rolling and finish rolling, and rolling the steel billet into a hot band with the specification of 4.0mm multiplied by 1250m, wherein the finish rolling temperature is about 950 ℃;
(2) the rolled high-temperature steel strip enters a hot coiling furnace arranged at the downstream of the finishing mill group to be coiled into a steel coil, the high-temperature steel coil is reheated in the hot coiling furnace to the solution annealing temperature of 1050 ℃, and the temperature is preserved for 3 minutes;
(3) after being uncoiled and straightened, a steel coil in a hot coiling furnace enters a cooling area, is rapidly cooled to about 300 ℃ by adopting a high-pressure jet water spraying mode, and then enters an underground coiling machine to be coiled into the steel coil;
(4) and conveying the steel coil cooled to room temperature to an annealing and pickling line, and performing scale breaking, shot blasting and pickling treatment to improve the surface quality, wherein the annealing furnace and the cooling equipment are kept in an empty state.
Comparative example (stainless steel hot-rolled coil-off line annealing and pickling process):
(1) heating a 304 austenitic stainless steel slab with the thickness of 220mm and the width of 1250mm to 1250 ℃ in a heating furnace, preserving heat for 3.5 hours, and discharging the slab out of the furnace; removing phosphorus from a steel billet from a heating furnace by high-pressure water, roughly rolling and finely rolling the steel billet into a hot band with the specification of 4.0mm multiplied by 1250m, wherein the finishing temperature is about 900 ℃;
(2) and the rolled steel strip passes through a laminar cooling area and then enters an underground recoiling machine for recoiling. The steel coil is unloaded and then conveyed to a steel coil warehouse, air cooled for more than 24 hours and cooled to room temperature;
(3) conveying the steel coil at room temperature to an off-line annealing and pickling line, uncoiling and straightening, welding the steel coil with the tail part of the steel strip in the front part, then passing through a solid solution annealing furnace with the length of 120m at the speed of 60m/min, heating the steel strip from room temperature to 1050 ℃ in a heating section of the annealing furnace, maintaining the temperature of the steel strip at 1050 ℃, fully dissolving alloy elements in a solid solution manner and fully softening tissues in a soaking section of the annealing furnace;
(4) and after the high-temperature steel at 1050 ℃ is taken out of the solution annealing furnace, the high-temperature steel enters a cooling zone, is rapidly cooled to room temperature by adopting an aerial fog cooling mode, and then is subjected to scale breaking, shot blasting and acid washing in sequence, so that the surface quality is improved. And (4) feeding the acid-washed steel strip into a coiling machine to be coiled into a commodity coil.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art can change or modify the technical content disclosed above into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (7)
1. The on-line solution treatment annealing process for the rolling waste heat of the stainless steel hot rolled coil is characterized in that the rolling waste heat is utilized to be connected with a hot rolling furnace after a hot rolling procedure; the hot coil furnace is provided with two coiling stations vertically distributed up and down, and natural gas or coal gas is adopted to perform heat supplementing and heat preservation on the steel coil, and the heat supplementing is performed to the solution annealing temperature; the specific process is as follows:
(1) heating a stainless steel continuous casting billet by a heating furnace, then preserving heat, removing phosphorus by high-pressure water after discharging, removing iron oxide scales on the surface, and then obtaining the target thickness and the target finish rolling temperature required by the process after rough rolling and finish rolling for multiple passes; (2) the rolled steel strip directly passes through a laminar cooling area and a coiling machine and enters a hot coiling furnace arranged at the downstream of the coiling machine to be coiled into a steel coil, the high-temperature steel coil is heated in the hot coiling furnace to a solution annealing temperature, and the temperature is kept for a period of time, so that carbide is fully dissolved, and the deformation hardened tissue is fully softened; (3) after a steel coil in the hot coil furnace is uncoiled, straightening is carried out, then the steel coil is rapidly cooled to be below 300 ℃, an irregular head part of the cooled steel strip is cut off and is welded with the tail part of a preorder steel strip, and buffering of materials in the welding process is realized through a loop; (4) and after being subjected to scale breaking, shot blasting and acid pickling passivation, the steel strip enters a coiling machine to be coiled into a finished steel coil.
2. The hot rolled stainless steel coil rolling waste heat in-line solution annealing process of claim 1, wherein the entire process does not include an annealing furnace.
3. The stainless steel hot rolled coil rolling waste heat online solution treatment process according to claim 1, wherein the hot rolling furnace is used for supplementing heat to the solution treatment temperature of 950-1150 ℃ and preserving heat for 2-5 minutes.
4. The on-line solution annealing process of rolling waste heat of a stainless steel hot-rolled coil according to claim 1, wherein the final rolling target temperature of the steel strip is maintained at 950 ℃ or higher.
5. The online solution treatment process for the rolling waste heat of the stainless steel hot-rolled coil according to claim 1, which is applied to the online solution treatment and acid pickling process flow of the rolling waste heat of the compact stainless steel hot-rolled coil, and is characterized in that in order to realize capacity matching of the rolling process and the solution treatment process, production is arranged in a cross mode, a hot coil furnace is arranged at the downstream of a coiler, and the coiler is arranged at the downstream of a laminar cooling zone;
part of the steel billets adopt the rolling waste heat online solution annealing process, the laminar flow header keeps a closed state in the process, the finish-rolled steel strips directly pass through a laminar flow cooling area and a coiling machine, enter a hot coil furnace arranged at the downstream of the coiling machine for coiling, and then pass through the following processes: uncoiling → pinch straightening → cooling → head and tail shearing → welding → scale breaking → shot blasting → acid washing → coiling;
the other part of the steel billet is subjected to a conventional annealing and pickling process, the laminar flow collecting pipe is kept in an open state in the process, the steel strip after finish rolling is cooled by a laminar flow cooling area, and is coiled by an underground coiler, and then the following procedures are carried out: uncoiling → pinch straightening → head and tail shearing → welding → annealing → cooling → scale breaking → shot blasting → acid washing → coiling.
6. The hot-rolled stainless steel coil rolling waste heat on-line solution annealing process according to claim 5, wherein the cooling process is performed by gas mist cooling or water jet cooling in the on-line solution annealing process using the rolling waste heat for the portion of the steel slab.
7. The on-line solution annealing process for the rolling waste heat of the stainless steel hot-rolled coil according to claim 1, when applied to the on-line solution annealing and off-line pickling process flow of the rolling waste heat of the stainless steel hot-rolled coil, is characterized in that a hot coil furnace is directly arranged behind a finishing mill group, and the specific process comprises the following steps: the steel strip after finish rolling directly enters a hot coil furnace to be coiled, is uncoiled and pinch-fed to be straightened, enters a post-rolling cooling area to be rapidly cooled to below 300 ℃, and then enters an underground coiler to be coiled into a steel coil; then uncoiling → pinch straightening → head and tail shearing → welding → scale breaking → shot blasting → acid washing → coiling.
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| CN101748256A (en) * | 2010-01-15 | 2010-06-23 | 山西太钢不锈钢股份有限公司 | Rolling and solution treatment method for 304 stainless strip steel |
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