CN104959398B - The stainless method for coiling of Limit specifications 304 - Google Patents
The stainless method for coiling of Limit specifications 304 Download PDFInfo
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- CN104959398B CN104959398B CN201510269785.7A CN201510269785A CN104959398B CN 104959398 B CN104959398 B CN 104959398B CN 201510269785 A CN201510269785 A CN 201510269785A CN 104959398 B CN104959398 B CN 104959398B
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Abstract
The stainless method for coiling of Limit specifications 304, the stainless thickness of Limit specifications described in technical field of metallurgical production is more than 2000mm more than 25.0mm, width；Including the description below: (1) enters stove from rustless steel and starts calculating and take out steel rhythm；(2) rustless steel enters furnace rear, and gas calorific value stabilizing is at 2,300 2400 kilocalories；(3) adjust aperture and the setting value of soaking zone temperature of each section of flow control valve of every heating furnace, make difference between the stove of four heating furnace tapping temperatures be less than 10 degree；(4) before rustless steel enters bringing-up section and soaking zone, respectively the upper and lower heat ratio of bringing-up section being 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 to set workpiece thickness as 45mm, and finishing mill speed controlling is at 2m/s or more than 2.5m/s.The present invention greatly improves production efficiency, improves lumber recovery good market prospect.
Description
Technical field
The invention belongs to technical field of metallurgical production, described Limit specifications is the big 25.0mm of thickness and width is more than
2000mm。
Background technology
Domestic current can produce thickness more than 25.0mm without any producer, the width roll bending more than 2000mm is stainless
Steel, 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., needs every piece of crop end, and lumber recovery is low, and production cost is higher.
Summary of the invention
The invention aims to reduce production cost, improve production efficiency.
Hot rolling 304 Limit specifications stainless-steel roll access method, the stainless thickness of described Limit specifications is more than 25.0mm, width
More than 2000mm；Its feature includes the description below:
1, enter stove from rustless steel to start calculating and take out steel rhythm；Wherein: slab block number=effective furnace length ÷ width of plate slab+slab
Spacing；Take out steel rhythm=rustless steel time in stove/slab block number；
2, rustless steel enters furnace rear, and gas calorific value stabilizing is at 2,300 2400 kilocalories；
3, adjust aperture and the setting value of soaking zone temperature of each section of flow control valve of every heating furnace, make four to add
Between the stove of hot stove tapping temperature, difference is less than 10 degree；
4, before rustless 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 to set workpiece thickness as 45mm, and finishing mill speed controlling 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, utilizing foregoing invention successfully to batch 25.4*2040 specification 304 rustless steel 9 pieces, scroll outward appearance is complete
Portion is up to standard, without any loose winding phenomenon.
In implementation process, scene follows these steps to carry out:
1, a blocking arm is installed in the side of coil stripping car, prevents coil of strip from tumbling from dolly；
2, pinch roll load is connected and is started to throw Stress control, and chute plate is close to coil of strip in whole coiling process and is carried out pressure
Controlling, Wrapping Roll uses Step-by-step control at head coil ing one, and after Step-by-step control terminates, Wrapping Roll is still not switched on using little pressure
Controlling, afterbody uses big pressure pressure tail；
3, from the beginning of rustless steel enters stove, steel rhythm is taken out according to the width calculation of stokehold institute pumping board base；
Wherein: slab block number=effective furnace length/width of plate slab+slab spacing；Take out steel rhythm=rustless steel time in stove/slab
Block number；Take out steel rhythm to be adjusted with the change of width of plate slab, it is ensured that the slab total effectively time in stove in stove and respectively in good time
Effective time in stove of section, thus ensure the uniformity of board briquette.
4, rustless steel enters furnace rear, and gas calorific value stabilizing is 2,300 2400 kilocalories, stablizing so that gas using quantity obtains of calorific value
To stable, and then making the flow of each burner be guaranteed, the length of flame is enough, to reduce the temperature of this type of plate slab length direction
It is poor to spend.
5, according to the difference of each stove working of a furnace, aperture and the soaking zone temperature of each section of flow control valve of every heating furnace is adjusted
The setting value of degree so that differ within the scope of 10 degree between the stove of the tapping temperature of four heating furnaces, reduces owing to setting instability
The rolling difficulty caused.
6, before rustless 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, so that slab upper and lower surface temperature reaches unanimity, it is to avoid slab kowtowing in the operation of rolling.
7, workpiece thickness is 45mm, and purpose increases mm finishing mill unit load, and finishing mill load can effectively prevent from sticking up after increasing
Head, finishing mill speed controlling, in more than 2.5m/s, same specification carbon steel threading speed 2m/s, increases threading speed, and coiling machine pinches
Roller, the control of Wrapping Roll, spool velocity can realize synchronize to improve, and beneficially strip steel head is nipped.
8, electric motor of coiling machine power reaches 1200kw, and pinch roll thrust reaches 750kn, and Wrapping Roll thrust reaches
1200kn, chucking power maximum is led in side can reach 150kn；
9, strip steel flipper guide waits that position aperture is pressed 70mm and set (same specification carbon steel is controlled by 50mm), is used for preventing finish rolling from coming
At plate rolling side guide top steel after flitch type side sway is serious, strip steel is obstructed heap steel.
10, the advanced rate of pinch roll is 10%(same specification carbon steel advanced 6%), the advanced purpose that strengthens increases strip steel biting speed,
Improve strip steel toward inertia when running in coiling machine, be conducive to nipping.
11, pinch roll load connect time to coiler mandrel load connection this period of time in, pinch roll is pressure control
System, pressure controlled pressure is 0.75 times of Withdrawal roll pressure；
12, before head nips coil wrapper roll, 7 circles use Step-by-step control, to 15 meters, afterbody termination of distance after 7 circles
This section uses the little Stress control of Wrapping Roll, and pressure is set as 110kn；In the middle part of strip coiling, Wrapping Roll is not switched on using little pressure
Control by two aspect benefits: one is that the little pressure of Wrapping Roll overcomes strip steel elastic deformation against coil of strip, and two is that little pressure is pushed down
The coil of strip batched effectively helps strip steel rolling；Afterbody 15 meters uses big Stress control, and pressure sets 750kn, it is ensured that afterbody is not sent out
Raw loose winding.Afterbody 15 meters refers to this section of 15 meters, afterbody coil of strip termination of distance.
13, during head is nipped, coiling machine chute plate uses position control, and head is nipped after coiling machine, and chute plate turns
Entering Stress control, Stress control section pressure selects 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 rustless steels include 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, and Ni is 8.0-
11.0, surplus is ferrum and includes avoiding impurity；
2, C≤0.07, Mn≤2.00, P≤0.045, S≤0.030, Si≤0.75, Cr is 17.5 19.5, and Ni is 8.0-
10.5, N≤0.10, surplus is ferrum and includes avoiding impurity；
3, C≤0.08, Mn≤2.00, P≤0.045, S≤0.030, Si≤1.00, Cr is 18.0 20.0, and Ni is 8.0-
10.5, surplus is ferrum and includes avoiding impurity；
4, C≤0.08, Mn≤2.00, P≤0.045, S≤0.030, Si≤1.00, Cr is 18.0 20.0, and Ni is 8.0-
10.5, surplus is ferrum and includes avoiding impurity.
Claims (1)
1. the stainless method for coiling of Limit specifications 304, the stainless thickness of described Limit specifications is more than 25.0mm, and width is more than
2000mm；Its feature includes the description below:
(1) enter stove from rustless steel to start calculating and take out steel rhythm；Wherein: slab block number=effective furnace length ÷ is (between width of plate slab+slab
Away from)；Take out steel rhythm=rustless steel time in stove/slab block number；
(2) rustless steel enters furnace rear, and gas calorific value stabilizing is at 2300 ~ 2400 kilocalories；
(3) adjust aperture and the setting value of soaking zone temperature of each section of flow control valve of every heating furnace, make four heating
Between the stove of stove tapping temperature, difference is less than 10 degree；
(4), before rustless 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, all
The upper and lower heat ratio of hot arc is adjusted to 2.2 ~ 2.5；
(5) mm finishing mill unit controls to set workpiece thickness as 45mm, and finishing mill speed controlling is at 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 |
Applications Claiming Priority (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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| Publication Number | Publication Date |
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| CN104959398A CN104959398A (en) | 2015-10-07 |
| CN104959398B true 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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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6039441B2 (en) * | 1980-03-28 | 1985-09-06 | 日本鋼管株式会社 | Slab hot rough rolling method |
| JP2000271641A (en) * | 1999-03-25 | 2000-10-03 | Kawasaki Steel Corp | Method for winding strip |
| CN101412038B (en) * | 2008-08-08 | 2010-07-28 | 湖南湘投金天钛金属有限公司 | Method for producing metallic titanium plate using medium-wide strip hot rolling machine set |
| CN102335681B (en) * | 2010-07-21 | 2013-09-25 | 宝山钢铁股份有限公司 | Coiling method for preventing hot rolling strip steel from being flatly coiled |
| CN102794300B (en) * | 2012-09-04 | 2014-06-18 | 无锡银荣板业有限公司 | Production method of 304 stainless steel and pure-copper cold compound coiled material |
| CN103143566B (en) * | 2013-03-06 | 2015-11-04 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of Titanium-steel composite board roll and production method thereof |
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