CN104959398A - Coiling method of limit specification 304 stainless steel - Google Patents
Coiling method of limit specification 304 stainless steel Download PDFInfo
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- CN104959398A CN104959398A CN201510269785.7A CN201510269785A CN104959398A CN 104959398 A CN104959398 A CN 104959398A CN 201510269785 A CN201510269785 A CN 201510269785A CN 104959398 A CN104959398 A CN 104959398A
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Abstract
The invention relates to a coiling method of limit specification 304 stainless steel, and belongs to the technical field of metallurgical production. The thickness of the limit specification stainless steel is greater than 25.0mm, and the width is greater than 2000mm. The method comprises the following steps: 1, calculating steel drawing rhythm when the stainless steel enters a furnace; 2, allowing the calorific value of gas to be stable in a range of 2300-2400 kilocalories after the stainless steel enters the furnace; 3, adjusting the opening degree of the flow amount adjusting valve of each of segments of each of a heating furnace and the set valve of the temperature of an isothermal segment to make a furnace difference among the steel tapping temperatures of the four heating furnaces smaller than 10DEG C; 4, respectively adjusting the lower and upper heat ratio of a heating segment to 1.2-1.5 before the stainless steel enters the heating segment and an isothermal segment, and adjusting the lower and upper heat ratio of the isothermal segment to be 2.2-2.5; and 5, controlling the setting thickness of an intermediate blank to be 45mm by using a finishing mill group, and controlling the speed of a finishing mill to be greater than 2m/s or 2.5m/s. The method greatly improves the production efficiency, improves the rolling yield and has good market prospect.
Description
Technical field
The invention belongs to technical field of metallurgical production, described Limit specifications is the large 25.0mm of thickness and width is greater than 2000mm.
Background technology
Domesticly can produce thickness without any producer and be greater than 25.0mm at present, width is greater than the roll bending stainless steel of 2000mm, and the domestic producer possessing production capacity uses uni-tension rolling to produce, and production efficiency is low.
At stainless hot rolling mill, individual produces Taiyuan Iron and Steel Co., and need every block crop end, lumber recovery is low, and production cost is higher.
Summary of the invention
The object of the invention is, in order to reduce production cost, to enhance productivity.
Hot rolling 304 Limit specifications stainless-steel roll access method, the stainless thickness of described Limit specifications is greater than 25.0mm, and width is greater than 2000mm; Its feature comprises following content:
1, from stainless steel enters stove, steel rhythm is taken out in calculating; Wherein: slab block number=effective furnace length ÷ width of plate slab+slab spacing; Take out steel rhythm=stainless steel time in stove/slab block number;
2, after stainless steel enters stove, gas calorific value stabilizing is at 2300-2400 kilocalories;
3, adjust the aperture of every heating furnace each section of flow control valve and the setting value of soaking zone temperature, make difference between the stove of all the people present's heating furnace tapping temperature be less than 10 degree;
4, before stainless steel enters bringing-up section and soaking zone, respectively the upper and lower heat ratio of bringing-up section is adjusted to 1.2-1.5, the upper and lower heat ratio of soaking zone is adjusted to 2.2-2.5;
5, mm finishing mill unit controls setting workpiece thickness is 45mm, and finishing mill speeds control is at 2m/s or more than 2.5m/s.
production cost of the present invention is low, and production efficiency is high.
Detailed description of the invention
The 1-2 month in 2014, utilize foregoing invention successfully to batch 25.4*2040 specification 304 stainless steel 9 pieces, scroll outward appearance is all up to standard, without any loose winding phenomenon.
In implementation process, scene follows these steps to carry out:
1, in the side of coil stripping car, a blocking arm is installed, prevents coil of strip from tumbling from dolly;
2, pinch roll load is connected and is started to throw Stress control, chute plate is close to coil of strip and is carried out Stress control in whole coiling process, and Wrapping Roll adopts Step-by-step control, after Step-by-step control terminates at head coil ing one, Wrapping Roll is not still opened and is adopted little Stress control, and afterbody uses large pressure to press tail;
3, from stainless steel enters stove, the width calculation according to stokehold institute pumping board base takes out steel rhythm;
Wherein: slab block number=effective furnace length/width of plate slab+slab spacing; Take out steel rhythm=stainless steel time in stove/slab block number; Take out steel rhythm to adjust with the change of width of plate slab in good time, Zong guarantee effective in the stove time of slab in stove and effective time in stove of each, thus ensure the uniformity of board briquette.
4, after stainless steel enters stove, gas calorific value stabilizing is at 2300-2400 kilocalories, and the stable gas using quantity that makes of calorific value is stablized, and then the flow of each burner is guaranteed, and the length of flame is enough, to reduce the temperature difference of this type of plate slab length direction.
5, according to the difference of each stove working of a furnace, adjust the aperture of every heating furnace each section of flow control valve and the setting value of soaking zone temperature, it is poor within 10 degree of scopes to make between the stove of the tapping temperature of all the people present's heating furnace, reduces the rolling difficulty caused owing to setting instability.
6, before stainless steel enters bringing-up section and soaking zone, respectively the lower upper heat ratio of bringing-up section and soaking zone is adjusted to 1.2-1.5 and 2.2-2.5, thus slab upper and lower surface temperature is reached unanimity, avoid slab kowtowing in the operation of rolling.
7, workpiece thickness is 45mm, object increases mm finishing mill unit load, finishing mill load effectively can prevent nose after increasing, finishing mill speeds control is at more than 2.5m/s, same specification carbon steel threading speed 2m/s, increases threading speed, coiler pinch-roll, Wrapping Roll, spool velocity can realize synchronous raising on controlling, and are conducive to strip steel head and nip.
8, electric motor of coiling machine power reaches 1200kw, and pinch roll thrust reaches 750kn, and Wrapping Roll thrust reaches 1200kn, and side leads that chucking power is maximum can reach 150kn;
9, position aperture press 70mm setting (same specification carbon steel controls by 50mm) to be with steel flipper guide to wait for, for after preventing finish rolling supplied materials template side sway seriously at plate rolling side guide top steel, be with steel to be obstructed heap steel.
10, the advanced rate of pinch roll is 10%(same specification carbon steel advanced 6%), the advanced object that strengthens increases band steel biting speed, improves inertia when band steel runs in coiling machine, is conducive to nipping.
11, in this period of time that coiler mandrel load is connected when pinch roll load is connected, pinch roll is Stress control, and pressure controlled pressure is 0.75 times of Withdrawal roll pressure;
12, before head nips coil wrapper roll, 7 circles adopt Step-by-step control, and adopt the little Stress control of Wrapping Roll to this section of distance 15 meters, afterbody termination after 7 circles, pressure setting is 110kn; In the middle part of strip coiling, Wrapping Roll is not opened and is adopted little Stress control by two aspect benefits: one is that the little pressure of Wrapping Roll is close to coil of strip and overcomes band steel elastic deformation, and two is that little pressure is pushed down the coil of strip batched and effectively helped band steel rolling; Afterbody 15 meters adopts large Stress control, and pressure setting 750kn, guarantees that afterbody loose winding does not occur.Afterbody 15 meters refers to this section of distance 15 meters, afterbody coil of strip termination.
13, in head nips process, coiling machine chute plate adopts position control, and head is nipped after coiling machine, and chute plate proceeds to Stress control, Stress control section pressure selection 65kn;
14, pinch roll load is switched to reel load cut-in pressure is 155kn; Flipper guide chucking power is reduced to 50kn.
In the present invention, 304 stainless steels comprise following 4 kinds: their mass percent respectively:
1, C≤0.08, Mn≤2.00, P≤0.045, S≤0.030, Si≤1.00, Cr is 18.0 – 20.0, Ni is 8.0-11.0, and surplus is iron and comprises and avoid impurity;
2, C≤0.07, Mn≤2.00, P≤0.045, S≤0.030, Si≤0.75, Cr is 17.5 – 19.5, Ni is 8.0-10.5, N≤0.10, and surplus is iron and comprises and avoid impurity;
3, C≤0.08, Mn≤2.00, P≤0.045, S≤0.030, Si≤1.00, Cr is 18.0 – 20.0, Ni is 8.0-10.5, and surplus is iron and comprises and avoid impurity;
4, C≤0.08, Mn≤2.00, P≤0.045, S≤0.030, Si≤1.00, Cr is 18.0 – 20.0, Ni is 8.0-10.5, and surplus is iron and comprises and avoid impurity.
Claims (1)
1. the stainless method for coiling of Limit specifications 304, the stainless thickness of described Limit specifications is greater than 25.0mm, and width is greater than 2000mm; Its feature comprises following content:
(1) from stainless steel enters stove, steel rhythm is taken out in calculating; Wherein: slab block number=effective furnace length ÷ width of plate slab+slab spacing; Take out steel rhythm=stainless steel time in stove/slab block number;
(2), after stainless steel enters stove, gas calorific value stabilizing is at 2300-2400 kilocalories;
(3) adjust the aperture of every heating furnace each section of flow control valve and the setting value of soaking zone temperature, make difference between the stove of all the people present's heating furnace tapping temperature be less than 10 degree;
(4) before stainless steel enters bringing-up section and soaking zone, respectively the upper and lower heat ratio of bringing-up section is adjusted to 1.2-1.5, the upper and lower heat ratio of soaking zone is adjusted to 2.2-2.5;
(5) mm finishing mill unit controls setting workpiece thickness is 45mm, and finishing mill speeds control is at 2m/s or more than 2.5m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510269785.7A CN104959398B (en) | 2015-05-25 | 2015-05-25 | The stainless method for coiling of Limit specifications 304 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510269785.7A CN104959398B (en) | 2015-05-25 | 2015-05-25 | The stainless method for coiling of Limit specifications 304 |
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| CN104959398A true CN104959398A (en) | 2015-10-07 |
| CN104959398B CN104959398B (en) | 2016-09-21 |
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| CN201510269785.7A Active CN104959398B (en) | 2015-05-25 | 2015-05-25 | The stainless method for coiling of Limit specifications 304 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108941211A (en) * | 2018-08-21 | 2018-12-07 | 首钢京唐钢铁联合有限责任公司 | Hot-rolled leveling unit and the method for handling strip |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56136201A (en) * | 1980-03-28 | 1981-10-24 | Nippon Kokan Kk <Nkk> | Hot roughing method for slab |
| CN1303323A (en) * | 1999-03-25 | 2001-07-11 | 川崎制铁株式会社 | Method of winding strips |
| CN101412038A (en) * | 2008-08-08 | 2009-04-22 | 湖南华菱涟源钢铁有限公司 | Method for producing metallic titanium plate using medium-wide strip hot rolling machine set |
| CN102335681A (en) * | 2010-07-21 | 2012-02-01 | 宝山钢铁股份有限公司 | Coiling method for preventing hot rolling strip steel from being flatly coiled |
| CN102794300A (en) * | 2012-09-04 | 2012-11-28 | 无锡银荣板业有限公司 | Production method of 304 stainless steel and pure-copper cold compound coiled material |
| CN103143566A (en) * | 2013-03-06 | 2013-06-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Titanium-steel composite board roll and production method thereof |
-
2015
- 2015-05-25 CN CN201510269785.7A patent/CN104959398B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56136201A (en) * | 1980-03-28 | 1981-10-24 | Nippon Kokan Kk <Nkk> | Hot roughing method for slab |
| CN1303323A (en) * | 1999-03-25 | 2001-07-11 | 川崎制铁株式会社 | Method of winding strips |
| CN101412038A (en) * | 2008-08-08 | 2009-04-22 | 湖南华菱涟源钢铁有限公司 | Method for producing metallic titanium plate using medium-wide strip hot rolling machine set |
| CN102335681A (en) * | 2010-07-21 | 2012-02-01 | 宝山钢铁股份有限公司 | Coiling method for preventing hot rolling strip steel from being flatly coiled |
| CN102794300A (en) * | 2012-09-04 | 2012-11-28 | 无锡银荣板业有限公司 | Production method of 304 stainless steel and pure-copper cold compound coiled material |
| CN103143566A (en) * | 2013-03-06 | 2013-06-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Titanium-steel composite board roll and production method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108941211A (en) * | 2018-08-21 | 2018-12-07 | 首钢京唐钢铁联合有限责任公司 | Hot-rolled leveling unit and the method for handling strip |
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| CN104959398B (en) | 2016-09-21 |
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