CN111482457B - Thin material rolling method for high-carbon steel tandem rolling blank - Google Patents
Thin material rolling method for high-carbon steel tandem rolling blank Download PDFInfo
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- CN111482457B CN111482457B CN202010269438.5A CN202010269438A CN111482457B CN 111482457 B CN111482457 B CN 111482457B CN 202010269438 A CN202010269438 A CN 202010269438A CN 111482457 B CN111482457 B CN 111482457B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B47/00—Auxiliary arrangements, devices or methods in connection with rolling of multi-layer sheets of metal
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
Abstract
The invention relates to a thin material rolling method of a high-carbon steel tandem rolling blank, which comprises the processes of blank pretreatment, heating and rolling, straightening after rolling and cooling; the invention realizes the smooth production of the high-carbon steel extreme thin steel plate, prevents the phenomena of welding, cracking and the like during the rolling of the high-carbon steel pack rolling blank by adjusting the heating and rolling processes, and realizes the strict control of the plate shape and the thickness precision.
Description
Technical Field
The invention relates to the technical field of composite steel plate rolling, in particular to a rolling method of a thin-specification steel plate produced by adopting a high-carbon-equivalent composite blank.
Background
The sheet-rolling refers to a process of stacking several layers of steel sheets together and hot-rolling the stacked sheets into a sheet by a two-roll mill. The production scale of the pack-rolled sheet is small, the investment is low, and the construction is fast; the rolling mill has a simple structure, so that the rolling mill is widely applied. However, for high-carbon steel products, the rolling reduction is small, the number of rolling passes is large when the rolling limit is thin, the final rolling temperature is low, and the last pass roll gap is small compared with conventional steel products due to the fact that the high-carbon steel products are high in strength at high temperature, so that the rolling difficulty is high, and the rolling success rate is low.
Disclosure of Invention
The invention provides a thin material rolling method of a high-carbon steel tandem rolling blank, which realizes smooth production of a high-carbon steel extreme thin specification steel plate, prevents the phenomena of welding and cracking and the like during the rolling of the high-carbon steel tandem rolling blank by adjusting heating and rolling processes, and realizes strict control of plate shape and thickness precision.
In order to achieve the purpose, the invention adopts the following technical scheme:
a thin material rolling method of a high-carbon steel tandem rolling billet comprises the following steps:
1) pre-treating a blank;
the length of a finished jointed board rolled by a blank of the overlapped rolling blank is less than 35 m, and the length of the jointed board is as follows: the thickness of the lower layer blank is 1.01-1.03: 1, assembling;
2) heating and rolling;
a. the heating temperature of the overlapped rolling blank is controlled to be 1250-1280 ℃, the temperature difference between the upper surface and the lower surface is 20-30 ℃, the total heating time is controlled according to (8-10) multiplied by the thickness of the blank, the thickness unit is cm, and the time unit is min;
b. in the heating process, controlling the time of a preheating section plus the time of a first heating section plus the time of a second heating section plus the time of a third heating section per the time of a soaking section as (1.2-1.4)/1;
c. before the rolled blank is discharged out of the heating furnace, roller bed cooling water is closed, and the flow of the roller cooling water is adjusted to 350-450L/min;
d. rolling by adopting a single stand of a finishing mill, and selecting a roller with the upper machine service rolling material amount of 3000-4000 t for scheduling;
e. transverse rolling is adopted for the first pass of rolling, the rolling reduction of the first pass is 10mm, and then the rolling reduction of each pass is controlled according to the rolling reduction rate not less than 12%;
f. a CVC (continuously variable crown) roller stringing system adopts a manual mode in the rolling process;
g. low-speed rolling is adopted, the maximum rolling speed is not more than 4m/s, and the rolling acceleration is not more than 1.5m/s2；
h. Adjusting the rolling thickness of the overlapped rolling blank by using a thickness gauge, and closing a ZPC automatic correction function of the rolling mill during the period by using the thickness of the center line head part and the edge part which do not contain a separant as an adjustment basis;
3) straightening after rolling;
straightening by adopting hot straightening and using a flat roller or a negative bending roller;
4) cooling;
and a controlled cooling process is adopted, so that direct blowing cold air is avoided.
Compared with the prior art, the invention has the beneficial effects that:
the smooth production of the high-carbon steel extreme thin steel plate is realized, the phenomena of welding and cracking and the like during the rolling of the high-carbon steel pack rolling blank are prevented by adjusting the heating and rolling processes, and the strict control of the plate shape and the thickness precision is realized.
Detailed Description
The invention relates to a thin material rolling method of a high-carbon steel tandem rolling blank, which comprises the following steps:
1) pre-treating a blank;
the length of a finished jointed board rolled by a blank of the overlapped rolling blank is less than 35 m, and the length of the jointed board is as follows: the thickness of the lower layer blank is 1.01-1.03: 1, assembling;
2) heating and rolling;
a. the heating temperature of the overlapped rolling blank is controlled to be 1250-1280 ℃, the temperature difference between the upper surface and the lower surface is 20-30 ℃, the total heating time is controlled according to (8-10) multiplied by the thickness of the blank, the thickness unit is cm, and the time unit is min;
b. in the heating process, the (preheating section time + first heating section time)/(second heating section time + third heating section time)/soaking section time is controlled to be (1.2-1.4)/1, the soaking time is prolonged, and the uniformity of steel burning is ensured.
c. Before the rolled blank is discharged out of the heating furnace, roller bed cooling water is closed, and the flow of the roller cooling water is adjusted to 350-450L/min;
d. rolling by adopting a single stand of a finishing mill, and selecting a roller with the upper machine service rolling material amount of 3000-4000 t for scheduling;
e. transverse rolling is adopted for the first pass of rolling, the rolling reduction of the first pass is 10mm, and then the rolling reduction of each pass is controlled according to the rolling reduction rate not less than 12%;
f. a CVC (continuously variable crown) roller stringing system adopts a manual mode in the rolling process;
g. low-speed rolling is adopted, the maximum rolling speed is not more than 4m/s, and the rolling acceleration is not more than 1.5m/s2；
h. Adjusting the rolling thickness of the overlapped rolling blank by using a thickness gauge, and closing a ZPC automatic correction function of the rolling mill during the period by using the thickness of the center line head part and the edge part which do not contain a separant as an adjustment basis;
3) straightening after rolling;
straightening by adopting hot straightening and using a flat roller or a negative bending roller; the use of positive bending rolls is strictly forbidden.
4) Cooling;
and a controlled cooling process is adopted, so that direct blowing cold air is avoided.
[ examples ] A method for producing a compound
In this example, taking a steel plate with a material number of B98024570000 produced by a production line of a thick plate portion 5500 in a certain rolling mill as an example, the thickness of an upper blank before assembly is 114mm, the thickness of a lower blank is 112mm, the total thickness of a stacked rolled blank after assembly is 226mm, the external dimension of the stacked rolled blank is 226 (thickness) × 1530 (width) × 3010 (length) mm, and the target dimension of the rolled steel plate is 11.4 (thickness) × 2670 (width) × 33890 (length) mm.
In the embodiment, the heating temperature of the pack rolling blank is controlled to 1270 ℃ on the upper surface and 1250 ℃ on the lower surface, and the time of the pack rolling blank entering the heating furnace is 16 of 2019, 8, month and 2 days: 04, the tapping time is 19 of 2019, 8 and 2 days: 42. during heating, (preheat phase time + heat phase time): (second heating session time + third heating session time): the soaking period time is 1.3: 1.3: 1, control is performed.
During production, a roller with the upper service rolling quantity of 3428t is selected for scheduling production; the parameters of each pass of rolling are shown in the following table:
| pass | Temperature (. degree.C.) | Thickness mm after rolling) | Pressing amount (mm) | Rolling force (kN) |
| 1 | 1200 | 214 | 10 | 1100 |
| 2 | 1191 | 180 | 34 | 4658 |
| 3 | 1185 | 154 | 26 | 4833 |
| 4 | 1180 | 130 | 24 | 4832 |
| 5 | 1176 | 113 | 17 | 4476 |
| 6 | 1172 | 95.2 | 17.8 | 3181 |
| 7 | 1151 | 80 | 15.2 | 3206 |
| 8 | 985 | 55.8 | 24.2 | 6643 |
| 9 | 981 | 36.5 | 19.3 | 7640 |
| 10 | 944 | 25.1 | 11.4 | 7728 |
| 11 | 929 | 18.5 | 6.6 | 6971 |
| 12 | 909 | 14.3 | 4.2 | 5897 |
| 13 | 865 | 11.4 | 2.9 | 5184 |
| 14 | Air passing |
In the embodiment, the final plate shape of the rolled steel plate is good, the thickness error is within the allowable range, and the comprehensive performance is excellent.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (1)
1. A thin material rolling method of high-carbon steel tandem rolling blank is characterized by comprising the processes of blank pretreatment, heating and rolling, straightening after rolling and cooling; wherein:
1) pre-treating a blank;
the length of a finished jointed board rolled by a blank of the overlapped rolling blank is less than 35 m, and the length of the jointed board is as follows: the thickness of the lower layer blank is 1.01-1.03: 1, assembling;
2) heating and rolling;
a. the heating temperature of the overlapped rolling blank is controlled to be 1250-1280 ℃, the temperature difference between the upper surface and the lower surface is 20-30 ℃, the total heating time is controlled according to (8-10) multiplied by the thickness of the blank, the thickness unit is cm, and the time unit is min;
b. during heating, (preheat phase time + heat phase time): (second heating session time + third heating session time): the soaking period time is (1.2-1.4): (1.2-1.4): 1, controlling;
c. before the rolled blank is discharged out of the heating furnace, roller bed cooling water is closed, and the flow of the roller cooling water is adjusted to 350-450L/min;
d. rolling by adopting a single stand of a finishing mill, and selecting a roller with the upper machine service rolling material amount of 3000-4000 t for scheduling;
e. transverse rolling is adopted for the first pass of rolling, the rolling reduction of the first pass is 10mm, and then the rolling reduction of each pass is controlled according to the rolling reduction rate not less than 12%;
f. a CVC (continuously variable crown) roller stringing system adopts a manual mode in the rolling process;
g. low-speed rolling is adopted, the maximum rolling speed is not more than 4m/s, and the rolling acceleration is not more than 1.5m/s2；
h. Adjusting the rolling thickness of the overlapped rolling blank by using a thickness gauge, and closing a ZPC automatic correction function of the rolling mill during the period by using the thickness of the center line head part and the edge part which do not contain a separant as an adjustment basis;
3) cooling;
and a controlled cooling process is adopted, so that direct blowing cold air is avoided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010269438.5A CN111482457B (en) | 2020-04-08 | 2020-04-08 | Thin material rolling method for high-carbon steel tandem rolling blank |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010269438.5A CN111482457B (en) | 2020-04-08 | 2020-04-08 | Thin material rolling method for high-carbon steel tandem rolling blank |
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| CN111482457A CN111482457A (en) | 2020-08-04 |
| CN111482457B true CN111482457B (en) | 2022-02-15 |
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| CN113020259A (en) * | 2021-03-12 | 2021-06-25 | 鞍钢股份有限公司 | High-carbon steel tandem rolling blank rolling process |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001300603A (en) * | 2000-04-17 | 2001-10-30 | Nkk Corp | Method of manufacturing sheet by pack rolling |
| CN102688884A (en) * | 2012-06-11 | 2012-09-26 | 南京钢铁股份有限公司 | Rolling process of limit-specification steel plate of 2800mm double-stand heavy and medium plate mill |
| CN105251769A (en) * | 2014-07-16 | 2016-01-20 | 鞍钢股份有限公司 | Rolling method for die steel composite steel plate |
| CN105821334A (en) * | 2016-05-31 | 2016-08-03 | 江阴兴澄特种钢铁有限公司 | Method for producing Q345DE steel plate with thickness of 4 mm on wide and thick plate rolling machine |
| CN108188178A (en) * | 2018-02-05 | 2018-06-22 | 南京钢铁股份有限公司 | A kind of wide thin plate production technology of ply rolling |
| CN108405611A (en) * | 2018-02-13 | 2018-08-17 | 鞍钢股份有限公司 | A kind of production method of special thick homojunction combined plate |
| CN110369501A (en) * | 2019-06-25 | 2019-10-25 | 鞍钢股份有限公司 | A kind of pack rolling method of quality control of ultra-thin ultra-wide steel plate |
| CN110586648A (en) * | 2019-09-06 | 2019-12-20 | 鞍钢股份有限公司 | Anti-weld crack rolling method for high-carbon equivalent composite blank |
-
2020
- 2020-04-08 CN CN202010269438.5A patent/CN111482457B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001300603A (en) * | 2000-04-17 | 2001-10-30 | Nkk Corp | Method of manufacturing sheet by pack rolling |
| CN102688884A (en) * | 2012-06-11 | 2012-09-26 | 南京钢铁股份有限公司 | Rolling process of limit-specification steel plate of 2800mm double-stand heavy and medium plate mill |
| CN105251769A (en) * | 2014-07-16 | 2016-01-20 | 鞍钢股份有限公司 | Rolling method for die steel composite steel plate |
| CN105821334A (en) * | 2016-05-31 | 2016-08-03 | 江阴兴澄特种钢铁有限公司 | Method for producing Q345DE steel plate with thickness of 4 mm on wide and thick plate rolling machine |
| CN108188178A (en) * | 2018-02-05 | 2018-06-22 | 南京钢铁股份有限公司 | A kind of wide thin plate production technology of ply rolling |
| CN108405611A (en) * | 2018-02-13 | 2018-08-17 | 鞍钢股份有限公司 | A kind of production method of special thick homojunction combined plate |
| CN110369501A (en) * | 2019-06-25 | 2019-10-25 | 鞍钢股份有限公司 | A kind of pack rolling method of quality control of ultra-thin ultra-wide steel plate |
| CN110586648A (en) * | 2019-09-06 | 2019-12-20 | 鞍钢股份有限公司 | Anti-weld crack rolling method for high-carbon equivalent composite blank |
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