CN113073185A - Multi-time heat treatment production method for 6-series automobile plate - Google Patents
Multi-time heat treatment production method for 6-series automobile plate Download PDFInfo
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- CN113073185A CN113073185A CN202110206072.1A CN202110206072A CN113073185A CN 113073185 A CN113073185 A CN 113073185A CN 202110206072 A CN202110206072 A CN 202110206072A CN 113073185 A CN113073185 A CN 113073185A
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- heat treatment
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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
- C21D8/0236—Cold 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention provides a multiple heat treatment production method for a 6-series automobile plate, and mainly relates to the technical field of automobile plate processing. A multiple heat treatment production method for 6-series automobile plates comprises the following steps: casting, homogenizing treatment of a large flat ingot, milling the surface of the large flat ingot, heating by a heating furnace, hot rolling, primary annealing, cold rolling, secondary annealing, cold rolling, solution treatment of a continuous annealing line and finished products, wherein the primary annealing and the secondary annealing are continuous annealing line or box furnace annealing. The invention has the beneficial effects that: the invention carries out homogenization heat treatment by the special homogenizing furnace, can improve the heating rate, can quickly cool after homogenization is finished, ensures that the internal quality of the large flat ingot is better and the organization is more uniform, saves the homogenization treatment time of the heating furnace and improves the production efficiency of the heating furnace.
Description
Technical Field
The invention mainly relates to the technical field of automobile plate processing, in particular to a multiple heat treatment production method for a 6-series automobile plate.
Background
The domestic automobile plate business is just started, is in the stage of market research and development and small-batch application, has a mature technical scheme abroad, and has high requirements on material performance, edge covering, bending, surface and material formability during the use process of the automobile plate.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a multiple heat treatment production method for 6-series automobile plates.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a multiple heat treatment production method for 6-series automobile plates comprises the following steps: the method comprises the following steps: casting, homogenizing treatment of a large flat ingot, milling the surface of the large flat ingot, heating by a heating furnace, hot rolling, primary annealing, cold rolling, secondary annealing, cold rolling, solution treatment of a continuous annealing line and finished products, wherein the primary annealing and the secondary annealing are continuous annealing line or box furnace annealing.
Further, the fusion casting comprises the following steps:
step 1: preheating the raw materials in a smelting furnace at the preheating temperature of 400-;
step 2: the melted metal liquid is transferred to a holding furnace for refining and slagging off, the refining temperature is 700-760 ℃, and the refining time is 20-90 min;
and step 3: casting a large flat ingot, namely casting qualified aluminum liquid according to a specified process, wherein the casting temperature is 660-720 ℃, and the casting speed is 40-60 mm/min.
Further, when casting in the step 3, the crystallizer and the dummy bar head are preheated to 200-300 ℃.
Further, in the step of homogenizing the large slab ingot, the homogenizing temperature is 500-600 ℃, and the heat preservation time is 2-20 h.
Furthermore, the large flat ingot surface milling mode is four-surface milling or eight-surface milling, the large surface milling amount is 10-25mm, and the small surface milling amount is 3-15 mm.
Further, the large flat ingot heating furnace is heated at the temperature of 400-.
Further, the final temperature of the hot rolling is 280-450 ℃, and the thickness of the hot rolled blank is 2-10 mm.
Further, the primary annealing temperature is 300-.
Further, the secondary annealing temperature is 300-.
Further, the solution treatment temperature of the continuous annealing line of the cold-rolled finished product is 500-580 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the invention carries out homogenization heat treatment by the special homogenizing furnace, can improve the heating rate, can quickly cool after homogenization is finished, ensures that the internal quality of the large flat ingot is better and the organization is more uniform, saves the homogenization treatment time of the heating furnace and improves the production efficiency of the heating furnace.
Drawings
FIG. 1 is a gold phase diagram of surface grains in example 1;
FIG. 2 is a longitudinal grain gold phase diagram of example 1;
FIG. 3 is a gold phase diagram of the lateral grains in example 1;
FIG. 4 is a gold phase diagram of surface grains in example 2;
FIG. 5 is a longitudinal grain gold phase diagram of example 2;
FIG. 6 is a gold phase diagram of the lateral grains in example 2;
FIG. 7 is a gold phase diagram of surface grains in example 3;
FIG. 8 is a longitudinal grain gold phase diagram of example 3;
FIG. 9 is a gold phase diagram of the lateral grains in example 3;
Detailed Description
The present invention will be further illustrated by reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the present application.
Example 1:
step 1: casting: adding the raw materials into a smelting furnace for preheating at 400 ℃ for 40min, heating the preheated raw materials, adding a proper amount of intermediate alloy, and heating at 630 ℃ for 150 min; the melted molten metal is transferred to a holding furnace through a converter for refining and slagging off, the refining temperature is 700 ℃, and the refining time is 20 min; casting the qualified aluminum liquid according to a specified process, wherein the casting temperature is 660 ℃, and the casting speed is 40 mm/min;
step 2: homogenizing large flat ingots: the homogenization treatment temperature is 500 ℃, and the heat preservation time is 2 hours;
and step 3: milling the surface of the large flat ingot, wherein the surface milling mode is four-surface milling or eight-surface milling, the surface milling amount of the large surface is 10mm, and the surface milling amount of the small surface is 3 mm;
and 4, step 4: heating a large flat ingot heating furnace: the heating temperature is 400 ℃;
and 5: hot rolling: the final hot rolling temperature is 280 ℃, the thickness of the hot rolled blank is 2mm, then primary annealing is carried out, the annealing temperature is 300 ℃, heat preservation is carried out for 1h, then cold rolling is carried out, secondary annealing is carried out, the annealing temperature is 300 ℃, the annealing thickness is 1.5mm, heat preservation is carried out for 1h, and cold rolling is carried out again;
step 6: continuous annealing line solution treatment: the temperature was 500 ℃.
Example 2:
step 1: casting: adding the raw materials into a smelting furnace for preheating at the temperature of 450 ℃ for 50min, heating the preheated raw materials, adding a proper amount of intermediate alloy, and heating at the temperature of 700 ℃ for 175 min; the melted molten metal is transferred to a holding furnace through a converter for refining and slagging off, the refining temperature is 730 ℃, and the refining time is 55 min; casting the qualified aluminum liquid according to a specified process, wherein the casting temperature is 690 ℃, and the casting speed is 50 mm/min;
step 2: homogenizing large flat ingots: the homogenization treatment temperature is 550 ℃, and the heat preservation time is 11 h;
and step 3: milling the surface of the large flat ingot, wherein the surface milling mode is four-surface milling or eight-surface milling, the large surface milling amount is 18mm, and the small surface milling amount is 9 mm;
and 4, step 4: heating a large flat ingot heating furnace: the heating temperature is 460 ℃;
and 5: hot rolling: the final hot rolling temperature is 360 ℃, the thickness of the hot rolled blank is 6mm, then primary annealing is carried out, the annealing temperature is 400 ℃, heat preservation is carried out for 6 hours, then cold rolling is carried out, secondary annealing is carried out, the annealing temperature is 400 ℃, the annealing thickness is 4.5mm, heat preservation is carried out for 6 hours, and cold rolling is carried out again;
step 6: continuous annealing line solution treatment: the temperature was 540 ℃.
Example 3:
step 1: casting: adding the raw materials into a smelting furnace for preheating at 500 ℃ for 60min, heating the preheated raw materials, adding a proper amount of intermediate alloy, and heating at 775 ℃ for 200 min; the melted molten metal is transferred to a holding furnace through a converter for refining and slagging off, the refining temperature is 760 ℃, and the refining time is 90 min; casting the qualified aluminum liquid according to a specified process, wherein the casting temperature is 720 ℃, and the casting speed is 60 mm/min;
step 2: homogenizing large flat ingots: the homogenization treatment temperature is 600 ℃, and the heat preservation time is 20 hours;
and step 3: milling the surface of the large flat ingot, wherein the surface milling mode is four-surface milling or eight-surface milling, the surface milling amount of the large surface is 25mm, and the surface milling amount of the small surface is 15 mm;
and 4, step 4: heating a large flat ingot heating furnace: the heating temperature is 520 ℃;
and 5: hot rolling: the final hot rolling temperature is 450 ℃, the thickness of the hot rolled blank is 10mm, then primary annealing is carried out, the annealing temperature is 490 ℃, heat preservation is carried out for 10 hours, then cold rolling is carried out, secondary annealing is carried out, the annealing temperature is 490 ℃, the annealing thickness is 7mm, heat preservation is carried out for 10 hours, and cold rolling is carried out again;
step 6: continuous annealing line solution treatment: the temperature was 580 ℃.
The invention carries out homogenization heat treatment by the special homogenizing furnace, can improve the heating rate, can quickly cool after homogenization is finished, ensures that the internal quality of the large flat ingot is better and the organization is more uniform, saves the homogenization treatment time of the heating furnace and improves the production efficiency of the heating furnace.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A multiple heat treatment production method for 6-series automobile plates is characterized by comprising the following steps: the method comprises the following steps: casting, homogenizing treatment of a large flat ingot, milling the surface of the large flat ingot, heating by a heating furnace, hot rolling, primary annealing, cold rolling, secondary annealing, cold rolling, solution treatment of a continuous annealing line and finished products, wherein the primary annealing and the secondary annealing are continuous annealing line or box furnace annealing.
2. The multiple heat treatment production method for the 6-series automobile plate according to claim 1, characterized in that: the fusion casting comprises the following steps:
step 1: preheating the raw materials in a smelting furnace at the preheating temperature of 400-;
step 2: the melted metal liquid is transferred to a holding furnace for refining and slagging off, the refining temperature is 700-760 ℃, and the refining time is 20-90 min;
and step 3: casting a large flat ingot, namely casting qualified aluminum liquid according to a specified process, wherein the casting temperature is 660-720 ℃, and the casting speed is 40-60 mm/min.
3. The multiple heat treatment production method for the 6-series automobile plate according to claim 2, characterized in that: and (3) preheating the crystallizer and the dummy bar head to 200-300 ℃ during casting in the step 3.
4. The multiple heat treatment production method for the 6-series automobile plate according to claim 1, characterized in that: in the step of homogenizing the large slab ingot, the homogenizing temperature is 500-600 ℃, and the heat preservation time is 2-20 h.
5. The multiple heat treatment production method for the 6-series automobile plate according to claim 1, characterized in that: the large flat ingot surface milling mode is four-surface milling or eight-surface milling, the large surface milling amount is 10-25mm, and the small surface milling amount is 3-15 mm.
6. The multiple heat treatment production method for the 6-series automobile plate according to claim 1, characterized in that: the large flat ingot heating furnace is used for heating, and the heating temperature is 400-520 ℃.
7. The multiple heat treatment production method for the 6-series automobile plate according to claim 1, characterized in that: the final temperature of the hot rolling is 280-450 ℃, and the thickness of the hot rolled blank is 2-10 mm.
8. The multiple heat treatment production method for the 6-series automobile plate according to claim 1, characterized in that: the primary annealing temperature is 300-.
9. The multiple heat treatment production method for the 6-series automobile plate according to claim 1, characterized in that: the secondary annealing temperature is 300-.
10. The multiple heat treatment production method for the 6-series automobile plate according to claim 1, characterized in that: the solution treatment temperature of the continuous annealing line of the cold-rolled finished product is 500-580 ℃.
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| CN202110206072.1A CN113073185A (en) | 2021-02-24 | 2021-02-24 | Multi-time heat treatment production method for 6-series automobile plate |
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| CN202110206072.1A CN113073185A (en) | 2021-02-24 | 2021-02-24 | Multi-time heat treatment production method for 6-series automobile plate |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1812959A1 (en) * | 1967-12-05 | 1969-08-21 | Alcan Res & Dev | Solution heat treatment of machined objects made of aluminum alloys |
| CN111254329A (en) * | 2020-02-25 | 2020-06-09 | 天津忠旺铝业有限公司 | Rolling process of 6061 aluminum alloy medium plate |
| CN112063817A (en) * | 2020-09-04 | 2020-12-11 | 山东南山铝业股份有限公司 | Secondary annealing production processing method for automobile plate |
-
2021
- 2021-02-24 CN CN202110206072.1A patent/CN113073185A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1812959A1 (en) * | 1967-12-05 | 1969-08-21 | Alcan Res & Dev | Solution heat treatment of machined objects made of aluminum alloys |
| CN111254329A (en) * | 2020-02-25 | 2020-06-09 | 天津忠旺铝业有限公司 | Rolling process of 6061 aluminum alloy medium plate |
| CN112063817A (en) * | 2020-09-04 | 2020-12-11 | 山东南山铝业股份有限公司 | Secondary annealing production processing method for automobile plate |
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