CN111618119A - Preparation process of alloy steel sheet - Google Patents
Preparation process of alloy steel sheet Download PDFInfo
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- CN111618119A CN111618119A CN202010463269.9A CN202010463269A CN111618119A CN 111618119 A CN111618119 A CN 111618119A CN 202010463269 A CN202010463269 A CN 202010463269A CN 111618119 A CN111618119 A CN 111618119A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
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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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0231—Warm rolling
-
- 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
- C21D8/0236—Cold rolling
-
- 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
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/081—Iron or steel solutions containing H2SO4
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/19—Iron or steel
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Metal Rolling (AREA)
Abstract
The invention provides a preparation process of an alloy steel sheet, which comprises the steps of material preparation, hot rolling cogging, intermediate annealing, acid pickling, warm rolling, intermediate annealing, coping, cold rolling, annealing, leveling to obtain the alloy steel sheet, wherein the method adopts the working procedures of intermediate annealing, acid and alkali washing, coping and the like in the rolling process, thereby effectively reducing the defects of steel plate surface microcracks, surface black spots and the like in the rolling process, and the adopted annealing process ensures that the internal stress is fully released, so that the whole rolling yield is greatly improved; the preparation method has low requirement on equipment, low input cost, good surface quality of the rolled steel plate, and unevenness less than or equal to 1mm, and meets the use requirements of industries such as precision instruments and meters, optical measurement systems and the like.
Description
Technical Field
The invention belongs to the technical field of rolling production of low-expansion 4J32 alloy steel sheets, and relates to a preparation process of a 4J32 alloy steel sheet suitable for industries such as precision instruments and meters, optical measurement systems and the like, in particular to a preparation process of an alloy steel sheet.
Background
Since the 4J32 super Invar alloy comes out, the alloy has wide practical application in the industries of precision instruments, optical measurement systems and the like due to the characteristic of low thermal expansion coefficient. The 4J32 super Invar alloy is a high-quality alloy steel material, has high added value of products, but has complex material characteristics and great production difficulty, and the requirements of rolling processing on equipment capacity and process accuracy are far higher than those of carbon steel. Particularly, the surface defects such as black spots and the like easily appear in the rolling process of the thin sheet, and the sheet defects such as buckling, waves and the like of the sheet material due to incomplete stress annealing exist after annealing.
Disclosure of Invention
In order to solve the problems, the invention provides a preparation process of an alloy steel sheet, and the 4J32 alloy steel sheet produced by the method has no obvious defects on the surface and good flatness, and completely meets the requirements of related industries.
The technical scheme adopted by the invention for solving the technical problems is as follows: a preparation process of an alloy steel sheet comprises the following steps:
step one, preparing materials: taking a steel ingot which is smelted and cast in a frequency furnace as a casting raw material;
step two, hot rolling and cogging: putting the steel ingot in the first step into a hydrogen-protected molybdenum wire furnace, heating to 1050-1100 ℃, keeping the temperature for 1-2 hours, taking out the steel ingot, cogging and hot rolling, and rolling to the thickness of 5-7 mm in multiple passes;
step three, intermediate annealing: annealing the steel ingot after cogging in the second step;
step four, acid washing: performing alkaline leaching, water quenching, acid washing, high-pressure water washing, neutralization and hot processing oxide skin removal on the product treated in the step three;
step five, warm rolling: heating the product treated in the fourth step to 950-1000 ℃, preserving heat for 40-60 min, and then rolling the product to a thickness of 2.8-3 mm in multiple passes;
step six, intermediate annealing: annealing the product subjected to warm rolling in the fifth step at 890-910 ℃ for 1-2 h, and then repeating the fourth step for pickling;
step seven, coping: grinding the product processed in the step six;
step eight, cold rolling: performing multi-pass cold rolling on the product polished in the seventh step;
step nine, annealing: stress relief annealing is adopted on the product after the cold rolling in the step eight;
step ten, leveling: and repeatedly leveling the product annealed in the step nine until the unevenness is less than or equal to 1mm to obtain a final product.
Furthermore, in the cogging hot rolling process in the second step, heat compensation is performed every 4 times, the time of heat compensation for each time is 30-50 min, and the heat compensation temperature is 1050-1100 ℃.
Furthermore, the annealing time in the third step is 1-2 h, and the annealing temperature is 900-.
Further, the method comprises the following steps: the alkaline leaching solution in the fourth step comprises the following components in parts by mass: 80 parts of NaoH and NaNO320 parts of alkaline leaching solution, and performing alkaline leaching in a molten state at the temperature of 480-540 ℃.
Further, the pickling solution in the fourth step comprises the following components in concentration: h2SO4250~300g/l、NaNO340-50g/l NaCl 30-40g/l, and the temperature of the pickling solution is 65-80 ℃.
Further, the neutralizing solution in the fourth step comprises the following components in concentration: na (Na)2CO33.5~5.0g/l，NaNO33-4.5g/l, and the temperature of the neutralization solution is more than or equal to 90 ℃.
And further, the polishing in the seventh step comprises water grinding, dry polishing, washing and drying.
Furthermore, the thickness of the product after the cold rolling of multiple times in the step eight is less than 1 mm.
Further, in the ninth step, the annealing time is 2-3 hours, and the annealing temperature is 800-850 ℃.
The beneficial effects of the invention are mainly shown in the following aspects:
1. based on the characteristics of 4J32 alloy steel, the method designs a set of complete rolling production process route, and effectively perfects the process system in the aspect of plastic processing of Invar alloy;
2. the method adopts the procedures of intermediate annealing, acid and alkali washing, coping and the like in the rolling process, effectively reduces the defects of microcracks, surface black spots and the like on the surface of the steel plate in the rolling process, and adopts the annealing process to ensure that the internal stress is fully released, so that the whole rolling yield is greatly improved;
3. the method has the advantages of simple preparation process, low requirement on equipment, low input cost, good surface quality of the rolled steel plate, unevenness less than or equal to 1mm, and capability of meeting the use requirements of industries such as precision instruments and meters, optical measurement systems and the like.
Drawings
FIG. 1 is a schematic diagram of the measurement of the unevenness of the alloy steel sheet prepared by the present invention.
Detailed Description
The present invention is described in detail with reference to the following examples, which are provided for the purpose of explaining the technical solutions of the present invention and describing the detailed embodiments and the specific operation procedures, but the scope of the present invention is not limited to the following examples.
A preparation process of an alloy steel sheet comprises the following steps:
step one, preparing materials: taking a steel ingot which is smelted and cast in a frequency furnace as a casting raw material;
step two, hot rolling and cogging: putting the steel ingot in the first step into a hydrogen-protected molybdenum wire furnace, heating to 1050-1100 ℃, keeping the temperature for 1-2 hours, taking out the steel ingot, cogging and hot rolling, and rolling to the thickness of 5-7 mm in multiple passes;
step three, intermediate annealing: putting the steel ingot cogging in the second step into a hydrogen annealing furnace for annealing;
step four, acid washing: performing alkaline leaching, water quenching, acid washing, high-pressure water washing, neutralization and hot processing oxide skin removal on the product treated in the step three;
step five, warm rolling: heating the product treated in the fourth step to 950-1000 ℃, preserving heat for 40-60 min, and then rolling the product to a thickness of 2.8-3 mm in multiple passes;
step six, intermediate annealing: annealing the product subjected to warm rolling in the fifth step at 890-910 ℃ for 1-2 h, and then repeating the fourth step for pickling;
step seven, coping: grinding the product processed in the step six;
step eight, cold rolling: performing multi-pass cold rolling on the product polished in the seventh step;
step nine, annealing: stress relief annealing is adopted on the product after the cold rolling in the step eight;
step ten, leveling: and repeatedly leveling the product annealed in the step nine until the unevenness is less than or equal to 1mm to obtain a final product.
Furthermore, in the cogging hot rolling process in the second step, heat compensation is performed every 4 times, the time of heat compensation for each time is 30-50 min, and the heat compensation temperature is 1050-1100 ℃.
Furthermore, the annealing time in the third step is 1-2 h, and the annealing temperature is 900-.
Further, the method comprises the following steps: the alkaline leaching solution in the fourth step comprises the following components in parts by mass: 80 parts of NaoH and NaNO320 parts of alkaline leaching solution, and performing alkaline leaching in a molten state at the temperature of 480-540 ℃.
Further, the pickling solution in the fourth step comprises the following components in concentration: h2SO4250~300g/l、NaNO340-50g/l NaCl and 30-40g/l, and the temperature of the pickling solution is 65-80 ℃;
further, the neutralizing solution in the fourth step comprises the following components in concentration: na (Na)2CO33.5~5.0g/l，NaNO33-4.5g/l, and the temperature of the neutralization solution is more than or equal to 90 ℃.
And further, the polishing in the seventh step comprises water grinding, dry polishing, washing and drying.
Furthermore, the thickness of the product after the cold rolling of multiple times in the step eight is less than 1 mm.
Further, in the ninth step, the annealing time is 2-3 hours, and the annealing temperature is 800-850 ℃.
The invention aims to provide a preparation process of a 4J32 alloy steel sheet, and the 4J32 alloy steel sheet produced by the method has no obvious defects on the surface and good flatness, and completely meets the requirements of related industries. The invention adopts the following technical scheme:
a preparation process of a 4J32 alloy steel sheet is characterized by comprising the following steps:
step one, preparing materials: the used raw materials are 4J32 alloy steel square ingots which are smelted and cast by an intermediate frequency furnace, and the physical properties of the steel ingots are as follows: the components meet the regulations of the industry standard YB/T5241-2005, the size is 40 × 70 × 170mm, and the surface quality meets the regulations of GB/T14985.
Step two, hot rolling and cogging: heating the ingot blank obtained by casting to 1050-fold-material 1100 ℃ by using a hydrogen-protected molybdenum wire furnace, keeping the temperature for 1h20min, taking out the ingot blank, and performing cogging hot rolling by using a two-roller irreversible rolling machine until the thickness is about 6mm in multiple passes, and performing heat compensation in every 4 passes in the middle, wherein the heat compensation temperature and time are 1050-fold-material 1100 ℃/40 min.
Step three, intermediate annealing: and (4) annealing the cogging alloy steel plate in a hydrogen annealing furnace to eliminate work hardening and improve plasticity, so as to prepare for subsequent processes. The specific process comprises the following steps: 900-.
Step four, acid washing: the hot rolled product is processed by the procedures of alkaline leaching, water quenching, acid washing, high-pressure water washing, neutralization and hot removal processing of oxide skin and the like. The alkali wash liquid comprises the following components in percentage by weight: 80% of NaoH +20% of NaNO3Heating to a molten state, wherein the temperature of the alkali liquor is as follows: 480-540 ℃; the proportion of pickling solution is as follows: h2SO4250-300g/l，NaNO340-50g/l of NaCl, 30-40g/l of NaCl and 65-80 ℃ of pickling solution; the proportion of the neutralization solution is as follows: na (Na)2CO33.5-5.0g/l，NaNO33-4.5g/l, and the temperature of the neutralization solution is more than or equal to 90 ℃. During alkaline leaching, the steel plate must be completely immersed by the alkali liquor so as to ensure that the alkali liquor and the oxide skin fully react, so that the oxide skin is loosened and is convenient to wash away in acid washing. After acid washing, the surface of the steel plate is subjected to oxidation film without oxide scale and is subjected to true color of metal, and after acid washing, the steel plate is washed by high-pressure water of more than 0.3Mpa and then put into a water tank for water washing.
Step five, warm rolling: warm rolling is carried out on cold rolling equipment, a workpiece is heated to 980 ℃ and is kept warm for 50min before entering a rolling deformation zone, and the workpiece is rolled to the thickness of about 2.7mm in multiple passes.
Step six, intermediate annealing: annealing the product after warm rolling at 900 ℃/1h for 30min, and then repeating the step 4 for pickling.
And step seven, polishing, namely polishing the product subjected to water milling, dry polishing, washing and drying by using a water mill, wherein the principle of water milling is that the product is lightly milled by multi-pass small reduction and forced reduction is avoided. After water grinding, individual defects still exist, and a grinding wheel is used for removing the defects by a handle. Grinding wheel material: the resin or clay binder grinding wheel has the granularity of 100 plus 200, the width of the grinding wheel is more than or equal to the width of a product of 3-5mm, the number of times of water grinding on each surface of the product is more than or equal to 4, and the product is washed and dried by high-pressure water and then enters the next procedure after no obvious defects exist on the surface.
Step eight, cold rolling: the polished product is cold-rolled on a cold rolling mill for multiple passes to a finished product with the thickness of less than 1 mm;
step nine, annealing: and (4) after rolling, performing stress relief annealing on the product by using a vacuum annealing furnace. The annealing process is 800-. During annealing, the steel plates are stacked on a pre-processed tool molybdenum base plate with high flatness, and weights such as molybdenum blocks are placed on the steel plates to apply certain pressure.
Step ten, leveling: the annealed steel plate is repeatedly leveled by a nine-roller leveler until the unevenness is less than or equal to 1mm, and the unevenness of the prepared alloy steel sheet is measured and shown in figure 1. And repeatedly leveling the alloy steel sheet above the nine-roller leveling machine until the unevenness of the alloy steel sheet is less than or equal to 1 mm.
Based on the characteristics of 4J32 alloy steel, the method designs a set of complete rolling production process route, and effectively perfects the process system in the aspect of plastic processing of Invar alloy; the method adopts the procedures of intermediate annealing, acid and alkali washing, coping and the like in the rolling process, effectively reduces the defects of microcracks, surface black spots and the like on the surface of the steel plate in the rolling process, and adopts the annealing process to ensure that the internal stress is fully released, so that the whole rolling yield is greatly improved; the method has the advantages of simple preparation process, low requirement on equipment, low input cost, good surface quality of the rolled steel plate, unevenness less than or equal to 1mm, and capability of meeting the use requirements of industries such as precision instruments and meters, optical measurement systems and the like.
While the invention has been described in detail and with reference to preferred embodiments thereof, it will be understood by those skilled in the art that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims. It is further noted that relational terms may be used herein to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (9)
1. A preparation process of an alloy steel sheet is characterized by comprising the following steps: the method comprises the following steps:
step one, preparing materials: taking a steel ingot which is smelted and cast in a frequency furnace as a casting raw material;
step two, hot rolling and cogging: putting the steel ingot in the first step into a hydrogen-protected molybdenum wire furnace, heating to 1050-1100 ℃, keeping the temperature for 1-2 hours, taking out the steel ingot, cogging and hot rolling, and rolling to the thickness of 5-7 mm in multiple passes;
step three, intermediate annealing: annealing the steel ingot after cogging in the second step;
step four, acid washing: performing alkaline leaching, water quenching, acid washing, high-pressure water washing, neutralization and hot processing oxide skin removal on the product treated in the step three;
step five, warm rolling: heating the product treated in the fourth step to 950-1000 ℃, preserving heat for 40-60 min, and then rolling the product to a thickness of 2.8-3 mm in multiple passes;
step six, intermediate annealing: annealing the product subjected to warm rolling in the fifth step at 890-910 ℃ for 1-2 h, and then repeating the fourth step for pickling;
step seven, coping: grinding the product processed in the step six;
step eight, cold rolling: performing multi-pass cold rolling on the product polished in the seventh step;
step nine, annealing: stress relief annealing is adopted on the product after the cold rolling in the step eight;
step ten, leveling: and repeatedly leveling the product annealed in the step nine until the unevenness is less than or equal to 1mm to obtain a final product.
2. The process for preparing an alloy steel sheet according to claim 1, wherein: and in the second cogging hot rolling process, heat is supplemented for every 4 times in the middle, the time of heat supplementation for each time is 30-50 min, and the heat supplementation temperature is 1050-1100 ℃.
3. The process for preparing an alloy steel sheet according to claim 1, wherein: the annealing time in the third step is 1-2 h, and the annealing temperature is 900-920 ℃.
4. The process for preparing an alloy steel sheet according to claim 1, wherein: the alkaline leaching solution in the fourth step comprises the following components in parts by mass: 80 parts of NaoH and NaNO320 parts of alkaline leaching solution, and performing alkaline leaching in a molten state at the temperature of 480-540 ℃.
5. The process for preparing an alloy steel sheet according to claim 1, wherein: the pickling solution in the fourth step comprises the following components in concentration: h2SO4250~300g/l、NaNO340-50g/l NaCl 30-40g/l, and the temperature of the pickling solution is 65-80 ℃.
6. The process for preparing an alloy steel sheet according to claim 1, wherein: the neutralizing solution in the fourth step comprises the following components in concentration: na (Na)2CO33.5~5.0g/l，NaNO33-4.5g/l, and the temperature of the neutralization solution is more than or equal to 90℃。
7. The process for preparing an alloy steel sheet according to claim 1, wherein: and the polishing in the seventh step comprises water grinding, dry polishing, washing and drying.
8. The process for preparing an alloy steel sheet according to claim 1, wherein: and step eight, the thickness of the product after the multi-pass cold rolling is less than 1 mm.
9. The process for preparing an alloy steel sheet according to claim 1, wherein: in the ninth step, the annealing time is 2-3 hours, and the annealing temperature is 800-850 ℃.
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2020
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| CN1114366A (en) * | 1994-06-29 | 1996-01-03 | 首钢总公司 | High-strength super-Invar alloy and productive method thereof |
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| CN102965604A (en) * | 2012-11-20 | 2013-03-13 | 西北有色金属研究院 | Method for preparing AZ31B magnesium alloy sheets |
| CN104775077A (en) * | 2015-03-23 | 2015-07-15 | 河北钢铁股份有限公司 | Ultrafine grained invar alloy ribbon and preparation method thereof |
| CN106269959A (en) * | 2015-06-08 | 2017-01-04 | 丹阳市凯鑫合金材料有限公司 | A kind of production method of invar made-up belt |
| CN105200358A (en) * | 2015-09-23 | 2015-12-30 | 广东欧菲莱斯环保装饰材料有限公司 | Forming technology of large-size sheet metal |
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| Title |
|---|
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