CN116024415A - Method for reducing anisotropy of r value of 439 cold-rolled sheet material - Google Patents
Method for reducing anisotropy of r value of 439 cold-rolled sheet material Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000000137 annealing Methods 0.000 claims abstract description 96
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 55
- 239000010959 steel Substances 0.000 claims abstract description 55
- 238000005098 hot rolling Methods 0.000 claims abstract description 39
- 238000005097 cold rolling Methods 0.000 claims abstract description 31
- 238000005554 pickling Methods 0.000 claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 238000003723 Smelting Methods 0.000 claims abstract description 7
- 238000005266 casting Methods 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims description 23
- 239000010935 stainless steel Substances 0.000 claims description 17
- 229910001220 stainless steel Inorganic materials 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 6
- 238000005868 electrolysis reaction Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000005336 cracking Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- CLOMYZFHNHFSIQ-UHFFFAOYSA-N clonixin Chemical compound CC1=C(Cl)C=CC=C1NC1=NC=CC=C1C(O)=O CLOMYZFHNHFSIQ-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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- 239000004576 sand Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a production method for reducing the anisotropy of r value of 439 cold-rolled sheet material, which comprises the production processes of smelting, casting, billet heating, hot rolling annealing, hot rolling pickling, cold rolling annealing and cold rolling pickling; the annealing temperature of the hot rolling annealing is less than or equal to 900 ℃, and the annealing time is 1-4 min; the annealing temperature of the cold rolling annealing is 950-1030 ℃ and the annealing time is 1-4 min; the r value of the produced 439 cold-rolled sheet steel strip in the 45-degree direction is improved by about 50 percent (from 1.1 to more than 1.6), the delta r value in the three directions of 0 degree, 45 degree and 90 degree is within 0.3, the anisotropy of the material is effectively reduced, the problem that the material is cracked in the 45-degree direction in the stamping process is solved, and the deep-drawing forming performance of the material is improved.
Description
Technical Field
The invention relates to the technical field of metal processing, in particular to a method for reducing the anisotropy of r value of 439 cold-rolled sheet material.
Background
With the rapid development of the automobile industry, the sales of automobiles increases year by year, and the use amount of stainless steel for automobile exhaust pipes is gradually increasing. With the increasing severity of automobile exhaust emission standards, the requirements on the stamping forming performance of materials are higher, and the processing technology of stainless steel strips for manufacturing automobile exhaust pipes is also more complex. In order to meet the complex processing technology of the automobile exhaust pipe material, the higher and better the r value of the material is generally required, the r value of the material can be improved by adopting the technology of increasing the cold rolling reduction or cold rolling twice annealing, but the problem of larger anisotropy of the r value of the material exists.
439 material is mainly used for producing automobile exhaust pipe parts, and the traditional 439 material production process comprises the following steps: steelmaking-hot rolling annealing pickling-cold rolling annealing pickling; in the production process, in order to make 439 material have good surface quality and performance, high-temperature short-time continuous annealing (the annealing temperature is above 1000 ℃) is generally adopted in the annealing process of the hot rolled plate so as to eliminate the strip-shaped structure in the material, make the strip-shaped structure grow into equiaxed crystal, and then cold rolling, rolling and annealing and pickling are carried out. The r value of 439 material obtained by the production process is generally the largest in the 90-degree direction, the middle in the 0-degree direction and the smallest in the 45-degree direction, and the r value difference of the three directions, namely the delta r value, is generally between 0.8 and 1.5 (the calculation formula of delta r is delta r= (r0+r90-2 x r45-degree)/2, wherein r0 is the r value in the 0-degree direction, r90 is the r value in the 90-degree direction, and r45 is the r value in the 45-degree direction), the r value difference of the three directions is larger, wherein the r value in the 45-degree direction is smaller, so that the material tends to deform along the 45-degree direction to cause cracking phenomenon in the press forming process of the material.
Disclosure of Invention
The invention provides a method for reducing the anisotropy of the r value of 439 cold-rolled sheet material, wherein a hot-rolled sheet is continuously annealed and pickled at medium and low temperature in a short time, and then cold-rolled, annealed and pickled; the r value of the produced 439 cold-rolled sheet steel strip in the 45-degree direction is improved by about 50 percent (from 1.1 to more than 1.6), the delta r value in the three directions of 0 degree, 45 degree and 90 degree is within 0.3, the anisotropy of the material is effectively reduced, the problem of cracking along the 45-degree direction in the material stamping process is solved, and the deep-drawing forming performance of the material is improved; compared with the traditional production process, the plate surface texture of the produced cold-rolled 2B/2D material has no obvious difference.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the production method for reducing the anisotropy of the r value of the 439 cold-rolled sheet material comprises the production processes of smelting, casting, billet heating, hot rolling annealing, hot rolling pickling, cold rolling annealing and cold rolling pickling; the product obtained was a 439 stainless steel strip product with a 2B/2D surface; wherein:
the hot rolling annealing process is as follows: the annealing temperature is less than or equal to 900 ℃, the annealing time is 1-4 min, and the annealing time is inversely proportional to the annealing temperature and directly proportional to the thickness of the plate; immediately cooling to room temperature after hot rolling annealing; the grains of the steel strip after hot rolling and annealing do not fully grow;
the cold rolling annealing process is as follows: the annealing temperature is 950-1030 ℃ and the annealing time is 1-4 min; and the annealing time is inversely proportional to the annealing temperature and directly proportional to the thickness of the plate; immediately cooling to room temperature after cold rolling and annealing; the grain size grade of the cold-rolled annealed steel strip is controlled to be 6.0-8.0 grade.
Further, the production process specifically comprises the following steps:
1) Smelting and continuously casting molten steel to obtain a steel billet meeting the component requirements;
2) Grinding the surface of the billet, and then heating in a hot rolling heating furnace;
3) The billet which is discharged out of the hot rolling heating furnace is subjected to high-pressure water spraying dephosphorization, rough rolling is performed for at least 5 times, finish rolling is performed for at least 7 times, and hot rolled black steel coil is obtained after coiling;
4) Carrying out hot rolling annealing and hot rolling pickling on the black steel coil to obtain white Pi Gangjuan;
5) Rolling the white steel coil by a twenty-high rolling mill back and forth for multiple passes to obtain a hard plate steel coil;
6) And (3) carrying out cold rolling annealing, electrolysis, cold rolling pickling and temper rolling on the hard sheet steel coil to obtain the 439 stainless steel strip product with the 2B/2D surface.
Further, in the step 2), the temperature of the billet entering the hot rolling heating furnace is more than or equal to 150 ℃.
Further, in the step 3), the steel billet is in the furnace for more than or equal to 180min, and the tapping temperature is controlled between 1130 and 1160 ℃.
Further, in the step 3), the finish rolling temperature is controlled to 850 ℃ or higher, and the coil temperature is controlled to 700 ℃ or lower.
Further, in the step 4), the TV value of the annealing furnace is 100-200 mm 2 /min。
Further, in the step 6), the TV value of the annealing furnace is 50-70 mm 2 /min。
Further, the chemical composition of the 439 cold-rolled sheet meets the 439 steel grade composition in the ASTM A240 standard.
Further, the value of r in the 45 DEG direction of the 439 stainless steel belt product with the 2B/2D surface is more than 1.6, and the value of Deltar in the three directions of 0 DEG, 90 DEG and 45 DEG is less than 0.3.
Compared with the prior art, the invention has the beneficial effects that:
1) Continuously annealing and pickling the hot rolled plate at medium and low temperatures for a short time, and then cold rolling, annealing and pickling; in the continuous annealing and pickling process of the hot rolled plate, the annealing temperature is controlled below 900 ℃, the annealing time is controlled between 1 and 4 minutes, and the annealing time is shorter as the temperature is higher and the thickness of the plate is thinner; the hot rolled plate obtained by adopting the annealing process is in a semi-annealed state, and the internal banded structure is not eliminated through metallographic observation, so that the grains are not fully grown; then the hot rolled plate is subjected to cold rolling, annealing and acid washing to obtain a 2B/2D material, and the grain size grade of the cold rolled annealed plate is 6.0-8.0 grade;
2) The r value of the produced 439 cold-rolled sheet steel strip in the 45-degree direction is improved by about 50 percent (from 1.1 to more than 1.6), the delta r value in the three directions of 0 degree, 45 degree and 90 degree is within 0.3, the anisotropy of the material is effectively reduced, the problem of cracking along the 45-degree direction in the material stamping process is solved, and the deep-drawing forming performance of the material is improved;
3) Compared with the traditional production process, the plate surface texture of the produced cold-rolled 2B/2D material has no obvious difference.
Drawings
FIG. 1 is a flow chart of a steelmaking process according to an embodiment of the invention.
FIG. 2 is a flow chart of a hot rolling process according to an embodiment of the present invention.
FIG. 3 is a flow chart of a hot rolling annealing pickling process according to an embodiment of the invention.
Fig. 4 is a flow chart of a cold rolling process according to an embodiment of the present invention.
FIG. 5 is a flow chart of a cold rolling annealing pickling process according to an embodiment of the invention.
In the figure: A. alloy iron B, scrap steel C, stainless steel slab D, black steel coil E, white steel coil F, hard sheet steel coil G.2B/2D surface stainless steel strip 1-1, electric furnace 1-2, converter 1-3, ladle refining furnace 1-4, vacuum refining furnace 1-5, slab caster 2-1, heating furnace 2-2, roughing mill 2-3, finishing mill 2-4, coiler 3-1, uncoiler 3-2, furnace zone 3-3, rust crusher 3-4, sand blaster 3-5, pickling zone 3-6, coiling machine 4-1, uncoiler 4-2, round trip multi-pass mill 4-3, coiling machine 5-1, uncoiler 5-2, furnace zone 5-3, neutral salt electrolysis zone 5-4, pickling zone 5-5, temper mill 5-6, coiling machine
Detailed Description
The following is a further description of embodiments of the invention, taken in conjunction with the accompanying drawings:
the invention relates to a production method for reducing the anisotropy of the r value of 439 cold-rolled sheet material, which comprises the production processes of smelting, casting, billet heating, hot rolling annealing, hot rolling pickling, cold rolling annealing and cold rolling pickling; the product obtained was a 439 stainless steel strip product with a 2B/2D surface; wherein:
the hot rolling annealing process is as follows: the annealing temperature is less than or equal to 900 ℃, the annealing time is 1-4 min, and the annealing time is inversely proportional to the annealing temperature and directly proportional to the thickness of the plate; immediately cooling to room temperature after hot rolling annealing; the grains of the steel strip after hot rolling and annealing do not fully grow;
the cold rolling annealing process is as follows: the annealing temperature is 950-1030 ℃ and the annealing time is 1-4 min; and the annealing time is inversely proportional to the annealing temperature and directly proportional to the thickness of the plate; immediately cooling to room temperature after cold rolling and annealing; the grain size grade of the cold-rolled annealed steel strip is controlled to be 6.0-8.0 grade.
Further, the production process specifically comprises the following steps:
1) Smelting and continuously casting molten steel to obtain a steel billet meeting the component requirements;
2) Grinding the surface of the billet, and then heating in a hot rolling heating furnace;
3) The billet which is discharged out of the hot rolling heating furnace is subjected to high-pressure water spraying dephosphorization, rough rolling is performed for at least 5 times, finish rolling is performed for at least 7 times, and hot rolled black steel coil is obtained after coiling;
4) Carrying out hot rolling annealing and hot rolling pickling on the black steel coil to obtain white Pi Gangjuan;
5) Rolling the white steel coil by a twenty-high rolling mill back and forth for multiple passes to obtain a hard plate steel coil;
6) And (3) carrying out cold rolling annealing, electrolysis, cold rolling pickling and temper rolling on the hard sheet steel coil to obtain the 439 stainless steel strip product with the 2B/2D surface.
Further, in the step 2), the temperature of the billet entering the hot rolling heating furnace is more than or equal to 150 ℃.
Further, in the step 3), the steel billet is in the furnace for more than or equal to 180min, and the tapping temperature is controlled between 1130 and 1160 ℃.
Further, in the step 3), the finish rolling temperature is controlled to 850 ℃ or higher, and the coil temperature is controlled to 700 ℃ or lower.
Further, in the step 4), the TV value of the annealing furnace is 100-200 mm 2 /min。
Further, in the step 6), the TV value of the annealing furnace is 50-70 mm 2 /min。
Further, the chemical composition of the 439 cold-rolled sheet meets the 439 steel grade composition in the ASTM A240 standard.
Further, the value of r in the 45 DEG direction of the 439 stainless steel belt product with the 2B/2D surface is more than 1.6, and the value of Deltar in the three directions of 0 DEG, 90 DEG and 45 DEG is less than 0.3.
439 cold-rolled sheet material produced by the traditional process has higher processing cracking rate along the 45-degree direction during stamping forming. The invention aims at the problems, and the following effects are achieved by adjusting the annealing process of the plate:
1) The r value of 439 cold-rolled sheet material in 45 degrees direction is improved, the original 1.1 is improved to more than 1.6, the anisotropy of the material is reduced, and the rm value of the material is improved, wherein the rm value= (r0+r90+2×r45 degrees)/4.
2) The deep drawing forming performance of the material is improved, and the reject ratio of cracking along the 45-degree direction in the process of punching forming caused by lower r value along the 45-degree direction in the downstream processing process is reduced.
The following examples are given by way of illustration of detailed embodiments and specific procedures based on the technical scheme of the present invention, but the scope of the present invention is not limited to the following examples. The methods used in the examples described below are conventional methods unless otherwise specified.
[ example ]
In this example, the composition of the 439/2B material produced meets the composition requirements of the 439 steel grade in ASTM A240 standard.
The following describes the embodiment of the present embodiment with reference to the drawings:
in this embodiment, as shown in fig. 1, alloy iron a and scrap steel B are used as raw materials, and are smelted by an electric furnace 1-1 and a converter 1-2, refined by a ladle refining furnace 1-3 or a vacuum refining furnace 1-4, and continuously cast by a slab caster 1-5 to obtain a stainless steel slab C.
As shown in FIG. 2, a stainless steel slab C is heated by a heating furnace 2-1, rough rolled by a roughing mill 2-2, finish rolled by a finishing mill 2-3, and coiled by a coiling machine 2-4 to obtain a black skin steel coil D.
As shown in fig. 3, after the black steel coil D is unwound by the unwinder 3-1, the black steel coil D is heated and annealed by the furnace area 3-2, crushed by the rust crusher 3-3, sandblasted by the sandblaster 3-4, pickled by the pickling area 3-5 and the like, and then is wound by the winding machine 3-6 to obtain the white steel coil E.
As shown in fig. 4, the white steel coil E is unwound by an unwinder 4-1, rolled by a round-trip multi-pass rolling mill 4-2 in multiple passes, and wound by a winding mill 4-3 to obtain a hard sheet steel coil F.
As shown in FIG. 5, after the hard-state plate steel coil F is unwound by an unwinder 5-1, the steel coil F is heated and annealed in a furnace area 5-2, electrolyzed in a neutral salt electrolysis area 5-3, pickled in a pickling area 5-4, tempered and rolled by a temper rolling machine 5-5, and then rolled by a rolling machine 5-6 to obtain a stainless steel strip G with a 2B/2D surface.
In this example, the finish rolling temperature in the hot rolling process is controlled to be 850 ℃ or higher, and the coil temperature is controlled to be 700 ℃ or lower; the process of annealing (hot rolling annealing) the black steel coil specifically comprises the following steps: the annealing temperature is less than or equal to 900 ℃, the annealing time T is controlled to be 1-4 min, and the value of an annealing furnace (the value of the annealing furnace is=the thickness T of the steel belt multiplied by the running speed V of the steel belt, the unit of the thickness T of the steel belt is mm, and the unit of the running speed V of the steel belt is mm/min) is 100-200 mm 2 Between/min, then immediately water cooled to room temperature. The process of annealing (cold rolling annealing) the hard sheet steel coil is specifically: rapidly heating from room temperature to 950-1030 ℃ for 1-4 min, and setting the TV value of the annealing furnace at 50-70 mm 2 Between/min, then immediately water cooled to room temperature. In the hot rolling annealing and cold rolling annealing processes, the annealing time is inversely proportional to the annealing temperature and directly proportional to the thickness of the sheet.
The specific process parameters are shown in table 1:
the 2B surface 439 cold rolled sheet stainless steel strip products produced in examples 1 to 10 had r-value anisotropy of less than 0.3 and each of the differences in directions of less than those of comparative examples 11 and 12, as shown in table 2.
TABLE 2
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (9)
1. A production method for reducing the anisotropy of r value of 439 cold-rolled sheet material is characterized in that the production process comprises smelting, casting, billet heating, hot rolling annealing, hot rolling pickling, cold rolling annealing and cold rolling pickling; the product obtained was a 439 stainless steel strip product with a 2B/2D surface; wherein:
the hot rolling annealing process is as follows: the annealing temperature is less than or equal to 900 ℃, the annealing time is 1-4 min, and the annealing time is inversely proportional to the annealing temperature and directly proportional to the thickness of the plate; immediately cooling to room temperature after hot rolling annealing; the grains of the steel strip after hot rolling and annealing do not fully grow;
the cold rolling annealing process is as follows: the annealing temperature is 950-1030 ℃ and the annealing time is 1-4 min; and the annealing time is inversely proportional to the annealing temperature and directly proportional to the thickness of the plate; immediately cooling to room temperature after cold rolling and annealing; the grain size grade of the cold-rolled annealed steel strip is controlled to be 6.0-8.0 grade.
2. The method for producing the cold rolled sheet material with reduced 439 r-value anisotropy according to claim 1, wherein the production process comprises the following steps:
1) Smelting and continuously casting molten steel to obtain a steel billet meeting the component requirements;
2) Grinding the surface of the billet, and then heating in a hot rolling heating furnace;
3) The billet which is discharged out of the hot rolling heating furnace is subjected to high-pressure water spraying dephosphorization, rough rolling is performed for at least 5 times, finish rolling is performed for at least 7 times, and hot rolled black steel coil is obtained after coiling;
4) Carrying out hot rolling annealing and hot rolling pickling on the black steel coil to obtain white Pi Gangjuan;
5) Rolling the white steel coil by a twenty-high rolling mill back and forth for multiple passes to obtain a hard plate steel coil;
6) And (3) carrying out cold rolling annealing, electrolysis, cold rolling pickling and temper rolling on the hard sheet steel coil to obtain the 439 stainless steel strip product with the 2B/2D surface.
3. The method for reducing the anisotropy of r-value of a 439 cold-rolled sheet material according to claim 2, wherein in the step 2), the temperature of the billet entering the hot-rolling heating furnace is not less than 150 ℃.
4. The production method for reducing the anisotropy of r value of 439 cold-rolled sheet material according to claim 2, wherein in the step 2), the billet is heated for 180min or more, and the tapping temperature is controlled to be 1130-1160 ℃.
5. The method for reducing the anisotropy of r-value of a 439 cold-rolled sheet material according to claim 2, wherein in said step 3), the finish rolling temperature is controlled to 850 ℃ or higher and the coil temperature is controlled to 700 ℃ or lower.
6. The method for reducing the anisotropy of r-value of 439 cold-rolled sheet material according to claim 2, wherein in said step 4), the annealing furnace TV value is 100 to 200mm 2 /min。
7. The method for reducing the anisotropy of r-value of 439 cold-rolled sheet material as claimed in claim 2, wherein in said step 6), the annealing furnace TV value is 50 to 70mm 2 /min。
8. A method of producing a reduced 439 cold rolled sheet material having an anisotropy of r-value according to claim 1 or 2, wherein the chemical composition of the 439 cold rolled sheet material meets the 439 steel grade composition of ASTM a 240.
9. The method for producing a reduced 439 cold rolled sheet material having an anisotropy of r-value as recited in claim 1 or 2, wherein the 2B/2D surface has a 439 stainless steel strip product having a 45 ° direction r-value of 1.6 or more and a Δr-value of 0 °, 90 °,45 ° or less of 0.3.
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