CN101914724B - Substrate for strapping band and production method thereof - Google Patents
Substrate for strapping band and production method thereof Download PDFInfo
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- CN101914724B CN101914724B CN 201010269566 CN201010269566A CN101914724B CN 101914724 B CN101914724 B CN 101914724B CN 201010269566 CN201010269566 CN 201010269566 CN 201010269566 A CN201010269566 A CN 201010269566A CN 101914724 B CN101914724 B CN 101914724B
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Abstract
The invention belongs to the field of ferrous metallurgy materials, in particular relates to a substrate for a strapping band and a production method thereof. The substrate comprises the following chemical components in percentage by weight: 0.14-0.20 percent of C, 0.17-0.37 percent of Si, 0.55-0.75 percent of Mn, less than or equal to not more than 0.035 percent of P,0.01-0.04 percent of AL and the balance of Fe and inevitable impurities, wherein the tensile strength is not less than 7850Mpa, the elongation percentage is not less than 8 percent and the repeated bending times is not less than 8. In the production method, the smelting steps comprises the specific steps of molten iron pretreatment sulfur removal station, top and bottom combined blown converter, LF (Low Frequency) steel ladle refining and slab continuous casting,; the hot rolling steps comprises the specific steps of heating, rough rolling, hot rolling, finish rolling, laminar cooling and reeling; and the cold rolling steps comprises the specific steps of acid pickling, cold rolling and heat treatment. The steel grade has reasonable mixture ratio of chemical components and higher product strength, elongation percentage and repeated bending times compared with national standard. The production method of the substrate can ensure the chemical organization and physical performance of the steel grade.
Description
Technical field
The invention belongs to field of ferrous metallurgy materials, be specifically related to a kind of strap substrate and production method thereof.
Background technology
Strap belongs to callable environmental protection type packing material, in addition erosion resistance, soundness and good toughness, and strap all is widely applied in industries such as iron and steel, glass, building materials.But because the strap raw material do not have unified standard, manufacturing enterprise often scale is less, technical force a little less than, employed raw material has very strong randomness, causes performance inconsistency large, lumber recovery is low.The strap substrate of cheaply stable performance of development of new be from now on strap with the developing direction of steel.
Domestic enterprise also is not used for producing the steel grade of strap specially at present, the user often uses Q235 or the raw materials such as 20MnSi, Q345, chemical ingredients and unstable properties, the fluctuation such as the tensile strength of steel plate, elongation, alternating bending frequency, thickness deviation, planeness is larger, the iron and steel that special requirement are higher, glass industry, performance is bad to be easy to cause the accidents such as loose winding, falling from high altitude.
Strap is used in Steel Plant and mainly plays attractive packages, and the problem of easy generation is the unusual fracture in the transportation; In industries such as glass, timber, except normal packaging function, also in hoisting process, play the lifting rope, relate to personnel safety.So require to possess higher tensile strength, elongation, and can guarantee the number of times of alternating bending the thickness deviation, planeness except necessity.From the angle of batch production, very high to purity, the stability requirement of steel.Strap is C, Mn, the Si that requires on the chemical ingredients than close limit with the method for steel production routine, during hot rolling in the above temperature finish to gauge of Ar3 (austenite is to the temperature of ferritic transformation), suitably improve the single pass draft when cold rolling to improve cold rolling rear intensity, turn blue and adopt lead patenting when processing.
Summary of the invention
The present invention is directed to the present strap state of the art of steel substrate, by optimizing steel grade chemical ingredients proportioning, adopt the slab continuous casting rolling technical process, and with flexible adjustment rolling temperature and draft, obtain required tissue and performance, and it is little to obtain a kind of strength fluctuation scope, elongation is high, turn blue and process rear excellent property, strap substrate and production method thereof that the percentage of A-class goods is high.
The technical solution used in the present invention is:
A kind of strap substrate, its contained Chemical Composition and shared parts by weight are: C=0.14～0.20%, Si=0.17～0.37%, Mn=0.55～0.75%, P≤0.035%, S≤0.035%, AL=0.01～0.04%, all the other are iron and inevitably are mingled with; Tensile strength 〉=7850Mpa, elongation 〉=8%, alternating bending 〉=8 time.
Above-mentioned strap comprises and smelts step, hot-rolled step, cold rolling step with the production method of substrate, it is characterized in that:
A. smelt step and comprise molten iron pretreatment desulfurizing station, top and bottom combined blown converter, LF ladle refining, sheet billet continuous casting, continuous casting working procedure is taked omnidistance argon shield casting, and molten steel overheat 20-30 ℃, pulling rate 1.0-1.3m/min adopts the plate shaped crystallizer of hydraulic vibration-type;
B. hot-rolled step comprise that heating, roughing, hot rolling are got, finish rolling, laminar flow cooling, coiling process, strand advances 700 ℃ of furnace temperatures in the heating process, 1210 ℃ of tapping temperatures, strand is at stove residence time 160-180min; The roughing operation adopts five passage roughing; Seven frame hot continuous rollings after the finish rolling operation employing dephosphorization, lubrication and rolling, start rolling temperature 1100-1150 ℃, 860 ± 20 ℃ of finishing temperatures; Spacer segment cooling before laminar flow cooling is adopted, rate of cooling 〉=23.0 ℃/s are as cold as soon 650 ± 20 ℃ and batch;
C. cold rolling step comprises pickling, cold rolling, heat treatment step, enters the pickling tank pickling after the hot rolled coil uncoiling, then enters the single stand cold mill reversable mill, and total reduction is 71%, batches after cold rolling; Heat treatment step adopts cold rolling hard volume itemize to enter preheating section, through batching → unload volume → packaging process, namely obtains the strap substrate.
Compared with prior art, unusual effect of the present invention and technical characterstic are summarized as follows:
Strap provided by the invention on the basis of strict control carbon, silicon, manganese content, is rationally controlled the content of Als with substrate chemical ingredients prescription, makes the Als that deposits in the steel both play the effect of refinement band crystalline grain of steel, has improved again the cleanliness factor of plasticity and molten steel.The detection index shows, can satisfy the related products requirement fully according to the present invention's its mechanical performance index of strap of producing of filling a prescription.In addition; the strap provided by the present invention method for making steel of steel; process control through operations such as molten iron pretreatment desulfurizing, top and bottom combined blown converter blowing, tapping deoxidization Argon, LF ladle refining, whole process protection casting; can reach and reduce sulphur content, raising Cleanliness of Molten Steel and slab quality; guarantee to be with steel mechanical property, and make production process hold manageable purpose.
The present invention adopts the higher short flow process slab continuous casting rolling Technology of production efficiency, it is at casting process, heating cycle, there are obvious difference in the aspects such as the operation of rolling and traditional hot continuous rolling process, wherein process characteristic is to adopt the direct heat charging, the intermediate blank hot rolling is got, seven frame tandem rollings, rolling lubrication and laminar flow cooling, batch by the intermediate blank Coil Box, can make the intermediate blank head and tail temperature even, prevent that drop in temperature is too fast, therefore, this Production Flow Chart can be adjusted rolling temperature and draft flexibly, obtain required tissue and performance, produce the calm steel of low-carbon (LC) aluminium of low-cost and high-performance.
The principle that every technical parameter limits in the mechanism of the starting material medium carbon alloy steel chemical ingredients that the present invention selects and the production method is as follows:
C is one of element of indispensable raising steel strength in the steel, along with the increase of carbon content, and cementite Fe in the steel
3C increases, and hardness also increases, but simultaneously its cold working (punching press, drawing) and welding property degenerate.Therefore, strap of the present invention steel medium carbon steel, its carbon content is 0.14-0.20%, on the upper side limit control can guarantee that cold rolling raw sheet has preferably cold-forming property and certain hardness.
Si: the strap substrate belongs to killed steel, and Si content wherein is generally at 0.12-0.17%, and silicon has increased the flowability of molten steel.The every increase by 0.1% of Si in carbon steel can make hot rolling tensile strength improve about 7.8-8.8Mpa, and elongation descends about 0.5%, therefore, for guaranteeing the intensity of strap, be its elongation of not obvious reduction simultaneously, Si content is carried out strict control, Si content 0.17-0.37%.
Mn can dissolve in ferrite, causes solution strengthening, and obtains thinner and perlite that intensity is higher when steel are cooled off after rolling, in same carbon content with either pearlite occurred is relative under the cooling conditions equally increases.In addition, add manganese can prevent from causing because of sulphur steel when hot-work embrittlement in the steel.Therefore Mn content should be limit control on the upper side.
Segregation occurs in P:P easily, and the homogeneity of performance and tissue is had disadvantageous effect, and causes corrosion resisting property to reduce, and for the strap substrate, the content of phosphorus is preferably low as far as possible, otherwise plasticity descends easily.
S, in general, the content of sulphur is the smaller the better.The segregation of S tendency is large in the steel, and sulfide inclusion is larger on the plasticity impact of strap substrate, and therefore, the control of S content should be low as much as possible.
Embodiment
Below in conjunction with embodiment in detail the present invention is described in detail.
Among the following embodiment, slab continuous casting rolling is produced line length 309.1m, pickling and cold-rolling line length 250m, and the specification of finished product volume is 3.1 * 1010 * C, rolls up heavy about 17 tons.
Embodiment 1:
The strap substrate that embodiment 1 provides, state Feng Gang reel number is 200910F51961, the weight percent of its chemical element moiety is: C:0.16%, Si:0.17%, Mn:0.56%, P:0.023%, S:0.007%.
Its production method is carried out as follows:
1, steel-making: steel melting furnace employing capacity is 120 tons converter, and tap is 122 tons, 1648 ℃ of tapping temperatures; Steel melting furnace molten steel is out carried out secondary refining through the LF ladle refining furnace, adopt the ordinary methods such as deoxygenated slag, intensification, composition adjustment, calcium processing, molten steel composition weight percent after refining finishes is controlled to be: C:0.16%, Si:0.17%, Mn:0.56%, P:0.023%, S:0.007%, Als:0.016%; 1584 ℃ of liquid steel temperatures.
2, continuous casting: continuous casting working procedure takes omnidistance argon shield to cast to reduce the Als loss, guarantees steel quality, and 25 ℃ of molten steel overheats adopt plate shaped crystallizer, and this crystallizer is hydraulic vibration, and Casting speed 1.3m/min, slab thickness are 180mm.
3, heating: strand enters process furnace after cooling off through secondary cooling zone, and strand advances 700 ℃ of furnace temperatures, 1210 ℃ of tapping temperatures, strand residence time 160min.
4, roughing: after strand went out process furnace, process high-pressure water descaler removal scale on surface entered the reversible roughing mill roughing with edger roll, 1140 ℃ of start rolling temperatures, and roughing 5 passages, total reduction is 81.3%, then enters Coil Box and batches.
5, finish rolling: after intermediate blank goes out the Coil Box dephosphorization, enter seven frame hot continuous rolling units, 1100 ℃ of start rolling temperatures, 862 ℃ of finishing temperatures, hot rolling thickness is 3.1mm, draft is F1:40.5% relatively; F2:39.5%; F3:36.4%; F4:26.1%; F5:23.0%; F6:18.8%; F7:11.5%.
6, cool off, batch: the cold mode of layer adopts front spacer segment cooling, rate of cooling: 〉=23.0 ℃/s; Coiling temperature is 646 ℃, batches rear naturally cooling.
7, pickling, cold rolling: enter pickling tank after the hot rolled coil uncoiling, then pickling speed 80m/min enters the single stand cold mill reversable mill, and total reduction is 71%; Batch after cold rolling.
8, thermal treatment: cold rolling hard involves in into the shearing unit, finished width 31.75mm behind the slitting, and itemize enters preheating section, and 442 ℃ of preheating section temperature, kink speed are 17m/s.
9, end properties: tensile strength 920Mpa, elongation 9%, alternating bending 12 times can reach the requirement of V grade standard.
Embodiment 2:
The strap substrate that embodiment 2 provides, state Feng Gang reel number is 200910F51922, the weight percent of its chemical element moiety is: C:0.15%, Si:0.21%, Mn:0.56%, P:0.017%, S:0.008%.
Its production method is carried out as follows:
1, steel-making: steel melting furnace employing capacity is 120 tons converter, and tap is 122 tons, 1674 ℃ of tapping temperatures; Steel melting furnace molten steel is out carried out secondary refining through the LF ladle refining furnace, adopt the ordinary methods such as deoxygenated slag, intensification, composition adjustment, calcium processing, molten steel composition weight percent after refining finishes is controlled to be: C:0.15%, Si:0.21%, Mn:0.56%, P:0.017%, S:0.008%, Als:0.023%; 1600 ℃ of liquid steel temperatures.
2, continuous casting: 25 ℃ of molten steel overheats, adopt plate shaped crystallizer, this crystallizer is hydraulic vibration, Casting speed 1.3m/min, slab thickness are 180mm.
3, heating: strand enters process furnace after cooling off through secondary cooling zone, and strand advances 700 ℃ of furnace temperatures, 1210 ℃ of tapping temperatures, strand residence time 160min.
4, roughing: after strand went out process furnace, process high-pressure water descaler removal scale on surface entered the reversible roughing mill roughing with edger roll, 1130 ℃ of start rolling temperatures, and roughing 5 passages, total reduction is 81.3%, then enters Coil Box and batches.
5, finish rolling: after intermediate blank goes out the Coil Box dephosphorization, enter seven frame hot continuous rolling units, 860 ℃ of finishing temperatures, hot rolling thickness is 3.1mm, draft is F1:40.7% relatively; F2:39.7%; F3:36.6%; F4:26.2%; F5:23.1%; F6:17.9%; F7:11.6%.
6, cool off, batch: the cold mode of layer adopts front spacer segment cooling, rate of cooling: 〉=23.0 ℃/s; Coiling temperature is 647 ℃, batches rear naturally cooling.
7, pickling, cold rolling: enter pickling tank after the hot rolled coil uncoiling, then pickling speed 80m/min enters the single stand cold mill reversable mill, and total reduction is 71%; Batch after cold rolling.
8, thermal treatment: cold rolling hard volume itemize enters preheating section, and 440 ℃ of preheating section temperature, kink speed are 18m/s.
9, end properties: tensile strength 900Mpa, elongation 9%, alternating bending 11 times can reach the requirement of V grade standard.
Embodiment 3:
The strap substrate that embodiment 3 provides, state Feng Gang reel number is 200910F51953, the weight percent of its chemical element moiety is: C:0.17%, Si:0.20%, Mn:0.57%, P:0.020%, S:0.008%; 1610 ℃ of liquid steel temperatures.
Its production method is carried out as follows:
1, steel-making: steel melting furnace employing capacity is 120 tons converter, and tap is 122 tons, 1654 ℃ of tapping temperatures; Steel melting furnace molten steel is out carried out secondary refining through the LF ladle refining furnace, adopt the ordinary methods such as deoxygenated slag, intensification, composition adjustment, calcium processing, molten steel composition weight percent after refining finishes is controlled to be: C:0.17%, Si:0.20%, Mn:0.57%, P:0.020%, S:0.008%, Als:0.017%; 1589 ℃ of liquid steel temperatures.
2, continuous casting: 25 ℃ of molten steel overheats, adopt plate shaped crystallizer, this crystallizer is hydraulic vibration, Casting speed 1.3m/min, slab thickness are 180mm.
3, heating: strand enters process furnace after cooling off through secondary cooling zone, and strand advances 700 ℃ of furnace temperatures, 1210 ℃ of tapping temperatures, strand residence time 170min.
4, roughing: after strand went out process furnace, process high-pressure water descaler removal scale on surface entered the reversible roughing mill roughing with edger roll, 1140 ℃ of start rolling temperatures, and roughing 5 passages, total reduction is 81.3%, then enters Coil Box and batches.
5, finish rolling: after intermediate blank goes out the Coil Box dephosphorization, enter seven frame hot continuous rolling units, 860 ℃ of finishing temperatures, hot rolling thickness is 3.1mm, draft is F1:40.5% relatively; F2:39.5%; F3:36.4%; F4:26.1%; F5:23.0%; F6:18.8%; F7:11.5%.
6, cool off, batch: the cold mode of layer adopts front spacer segment cooling, rate of cooling: 〉=23.0 ℃/s; Coiling temperature is 646 ℃, batches rear naturally cooling.
7, pickling, cold rolling: enter pickling tank after the hot rolled coil uncoiling, then pickling speed 80m/min enters the single stand cold mill reversable mill, and total reduction is 71%; Batch after cold rolling.
8, thermal treatment: cold rolling hard volume itemize enters preheating section, and 443 ℃ of preheating section temperature, kink speed are 19m/s.
9, end properties: tensile strength 890Mpa, elongation 10%, alternating bending 10 times can reach the requirement of V grade standard.
Claims (1)
1. a strap is with the production method of substrate, and the contained Chemical Composition of this strap substrate and shared parts by weight are: C=0.16%, Si=0.17%, Mn=0.56%, P=0.023%, S=0.007%, Al=0.016%, all the other are iron and inevitably are mingled with; Tensile strength 920Mpa, elongation 9%, alternating bending 12 times; Its production method comprises smelts step, hot-rolled step, cold rolling step, it is characterized in that:
A. smelt step and comprise molten iron pretreatment desulfurizing station, top and bottom combined blown converter, LF ladle refining, sheet billet continuous casting, continuous casting working procedure is taked omnidistance argon shield casting, 25 ℃ of molten steel overheats, and pulling rate 1.3m/min adopts the plate shaped crystallizer of hydraulic vibration-type;
B. hot-rolled step comprise that heating, roughing, hot rolling are got, finish rolling, laminar flow cooling, coiling process, strand advances 700 ℃ of furnace temperatures in the heating process, 1210 ℃ of tapping temperatures, strand is at stove residence time 160min; The roughing operation adopts five passage roughing; Seven frame hot continuous rollings after the finish rolling operation employing dephosphorization, lubrication and rolling, 1100 ℃ of start rolling temperatures, 862 ℃ of finishing temperatures; Spacer segment cooling before laminar flow cooling is adopted, rate of cooling 〉=23.0 ℃/s are as cold as soon 646 ℃ and batch;
C. cold rolling step comprises pickling, cold rolling, heat treatment step, enters the pickling tank pickling after the hot rolled coil uncoiling, then enters the single stand cold mill reversable mill, and total reduction is 71%, batches after cold rolling; Heat treatment step adopts cold rolling hard volume itemize to enter preheating section, through batching → unload volume → packaging process, namely obtains the strap substrate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010269566 CN101914724B (en) | 2010-09-02 | 2010-09-02 | Substrate for strapping band and production method thereof |
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| CN 201010269566 CN101914724B (en) | 2010-09-02 | 2010-09-02 | Substrate for strapping band and production method thereof |
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| CN101914724A CN101914724A (en) | 2010-12-15 |
| CN101914724B true CN101914724B (en) | 2013-03-20 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179407A (en) * | 2011-03-17 | 2011-09-14 | 宁波钢铁有限公司 | Method for preparing hot rolling strip steel capable of preventing edge crack of extremely thin rolled strip steel |
| CN103741019B (en) * | 2013-12-19 | 2016-04-20 | 马钢(集团)控股有限公司 | A kind of hot rolled strip and production method thereof |
| CN105385947A (en) * | 2015-11-26 | 2016-03-09 | 河北钢铁股份有限公司承德分公司 | Steel for vanadium-microalloying 600 MPa high-strength packing belt and production method |
| CN108359851B (en) * | 2018-02-05 | 2020-06-26 | 奥科宁克（昆山）铝业有限公司 | Manufacturing process of packing belt |
| CN111850410B (en) * | 2020-07-30 | 2022-02-15 | 吉林建龙钢铁有限责任公司 | Cold-hard coiled plate for packing belt and preparation method thereof |
| CN112725694A (en) * | 2020-12-18 | 2021-04-30 | 本钢板材股份有限公司 | Hot-rolled pickled steel coil for improving flattening performance of welded pipe after cold drawing and production method thereof |
| CN114645187A (en) * | 2022-01-29 | 2022-06-21 | 安阳钢铁股份有限公司 | Non-quenched and tempered 950 MPa-grade high-strength strapping steel and production method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1521092A (en) * | 2003-01-30 | 2004-08-18 | 伊利诺斯工具公司 | Steel strapping |
| CN1631611A (en) * | 2005-01-12 | 2005-06-29 | 钢铁研究总院 | Manufacturing method for high strength bailing band |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5825434A (en) * | 1981-08-10 | 1983-02-15 | Kawasaki Steel Corp | Manufacture of band material for high tension bundling |
| AU671246B2 (en) * | 1994-04-28 | 1996-08-15 | Illinois Tool Works Inc. | Method and apparatus for an improved steel strap |
| US20030116231A1 (en) * | 1997-03-07 | 2003-06-26 | O'hara Randy D. | Hydrogen-induced-cracking resistant and sulphide-stress-cracking resistant steel alloy |
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2010
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1521092A (en) * | 2003-01-30 | 2004-08-18 | 伊利诺斯工具公司 | Steel strapping |
| CN1631611A (en) * | 2005-01-12 | 2005-06-29 | 钢铁研究总院 | Manufacturing method for high strength bailing band |
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