CN101185938A - Method for producing steel bar with rib - Google Patents
Method for producing steel bar with rib Download PDFInfo
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Abstract
The invention belongs to rolled steel field, which relates to the reinforcing steel bar production. The production method of ribbed bars of the invention is to implement continuous rolling on the production device with the ribbed bars; the technique process comprises heating, rough rolling, medium rolling, pre-precision rolling, precision rolling, reducing sizing, spinning, cooling, reel collecting and packing, wherein, the heating temperature of the steel billet is from 900 to 1050 DEG C; the temperature of the rough rolling is controlled between 840 to 1000 DEG C; the temperature of the medium rolling and the pre-precision rolling is not additionally controlled, the temperature of the medium rolling is the self-temperature of the ingot after rough rolling, and the temperature of the pre-precision rolling is the self-temperature of the ingot after medium rolling; the temperature of the ingot at the inlet of the finishing mill group is controlled between 750 to 900 DEG C; the temperature of the ingot when entering the inlet of the reducing sizing group is 750 to 900 DEG C; the temperature of the rolled stock at the outlet of the laying head is controlled between 600 to 880 DEG C. The invention can realize the phrase transformation mechanism of the deformation induced ferrite, produces ribbed bars of fine grain and ultra-fine grain, and ensures the ribbed bars to get higher intensity and favorable plasticity and toughness.
Description
Technical field
The invention belongs to the steel rolling field, relate to the rolling of reinforcing bar.
Background technology
Along with the development of building trade, large-scale basis facility and urbanization construction need a large amount of building iron, particularly Ribbed Bar, so the application quantity of Ribbed Bar is increasing, in China, its Ribbed Bar consumption figure was above 7,000 ten thousand tons in 2004.In this case, improve the reinforcing bar product performance and service efficiency, reduce production costs, be sternness and the difficult task that the iron and steel worker is faced, also be the key subjects that everybody paid close attention to.
In the prior art, the method for the performance (raising strength grade) of raising reinforcing bar mainly comprises following several:
(1) microalloying promptly adds alloying element in steel, the most frequently used alloying element mainly contains V, Nb, Ti etc., solution strengthening, precipitation strength and the control grain growth by alloying element be used for reaching the purpose that improves intensity.Wherein typical steel grade is 20MnSiV, and this steel grade is to add 0.04～0.09%V element on the basis of 20MnSi, thereby makes its intensity bring up to 4 35Mpa (III level) from 335Mpa (II level), but because the adding of V makes the cost of reinforcing bar raise.
(2) immediate quenching promptly adopts high temperature rolling, wears water cooling after rolling, and self tempering is organized as tempered martensite.Though the reinforced steel bar strength that this method is produced is high, strong flexor ratio is low, and welding performance is poor, can not adopt welding procedure to connect, and more inapplicable high-speed wire production line milling train is produced wire rod.
(3) grain refinement, the performance for improve material by crystal grain thinning has obtained general approval, and is considered to the most cost-effective Strengthening and Toughening means.The method that obtains final ultrafine-grained (UFG) microstructure is a lot, as in austenite recrystallization district distortion, by the austenite crystal grain of crystallization refine austenite more repeatedly, and then obtains the tiny ferrite and second phase constitution by phase transformation.Perhaps pass through strain-induced transformation, crystal grain thinning.Australian Patent 9419292.9 usefulness 0.21C-0.99Mn-0.29Si produce yield strength 500Mpa, the strip of tensile strength 505Mpa, but because yield tensile ratio is too high, reach 0.99, therefore can't in industrial production, use, lack practicality, and it is primarily aimed at strip, for the production of reinforcing bar, because its deformation condition and strip difference are very big, strip suffered shear stress in the operation of rolling is very big, and for the production of reinforcing bar, suffered is multiaxial stress, and local pressure is less relatively, therefore is difficult for the refinement ferrite crystal grain.
The objective of the invention is to economize on resources and existing working condition under, can significantly improve the Ribbed Bar production method Ribbed Bar performance, that improve strength grade and service efficiency.
Based on above-mentioned purpose, the present invention is directed to the high-speed wire production line of desin speed more than 50m/s, utilize deformation induced ferritic phase variable mechanism, produce fine grain, ultra-fine grain Ribbed Bar, make it obtain higher intensity and good plasticity and toughness.Realize deformation induced ferritic phase variable mechanism, need meet the following conditions: 1. can realize the controlled rolling of critical austenitic area; 2. can realize the online temperature-controlled rolling of whole process.For this reason, the present invention has adopted following technical scheme.
Ribbed Bar production method of the present invention is the method for carrying out continuous rolling on the Ribbed Bar process units shown in the accompanying drawing 1, this Ribbed Bar device comprises feeding platform, heating furnace, roughing unit, middle milling train group, pre-finishing mill group, mm finishing mill unit, reducing sizing mill group, pinch roll, the unit of weaving silk, Stevr rub air-cooled line, collection reel and baling press, and, above-mentioned unit and equipment are connected in turn on the production line by being rolled the operation roller-way of workpiece., be equipped with between its unit and wear water-cooling apparatus to the unit of weaving silk from the pre-finishing mill group, and wear water-cooling apparatus and be provided with the automatic closed loop temperature control system, so that control is rolled by the cooling velocity of steel rolling base.
The technological process of this production method comprise heating, roughing, in roll, pre-finish rolling, finish rolling, subtract sizing, weave silk, cool off, collect volume and pack.Promptly through the heating after steel billet, after the heating furnace release, entering the roughing unit immediately successively, to carry out that roughing, middle milling train group are rolled in carrying out, the pre-finishing mill group is carried out pre-finish rolling, mm finishing mill unit is carried out finish rolling, the reducing sizing mill group subtracts sizing, the unit of weaving silk carries out final molding rolling, after Stevr rubs air-cooled line air cooling, enter the collection reel again and curl and the baling press packing, finish whole process of production continuously.
Ribbed Bar production method of the present invention, its key is will be in above-mentioned technical process, control each technological parameter, so that implement controlled rolling and cooling control after rolling in critical austenitic area, realize deformation induced ferrite transformation, finally reach refinement ferrite-pearlite crystal grain, both improved the intensity of Ribbed Bar, keep good plasticity and toughness again.Now each technical process is presented below:
(1) steel billet heating
Steel billet enters in the heating furnace through feeding platform and heats, and heating-up temperature is 900～1050 ℃, and under this heating-up temperature, its austenite has been realized homogenising within a short period of time, and austenite crystal is not alligatoring also, and oxidization burning loss is few, saves the energy, and cost reduces greatly.The heating-up temperature of tradition reinforcing bar production is 1000～1200 ℃, and energy consumption is big, and austenite structure is thick.The present invention reduces alloying element content in the chemical composition scope of steel grade, austenite homogenising curve is moved to left, and helps reducing heating-up temperature, shortens soaking time, alleviates thickization of austenite tendency.In addition, lower heating-up temperature helps follow-up temperature control, alleviates follow-up temperature control pressure.
(2) roughing
Steel billet after the heating furnace heating after the heating furnace release, enters the roughing unit immediately and carries out roughing, and the roughing temperature is controlled at 840～1000 ℃.Adopt zerolling, make the distortion of workpiece non-recrystallization district, obtain more tiny austenite grain size, for austenite, because of temperature lower, more tiny austenite crystal is grown up comparatively slow, and the comparatively tiny austenite structure that obtains is easier in control cooling procedure subsequently to obtain more tiny ferrite crystal grain.
(3) roll in and pre-finish rolling
Blank after roughing following closely, milling train group and pre-finishing mill group in successively entering are rolled in carrying out and pre-finish rolling, wherein roll rolling temperature and be self temperature of blank after the breaking down.Milling train group temperature does not add control promptly, is advisable with normal temperature; The pre-finishing mill temperature is not additionally control also, is as the criterion with normal rolling temperature rise; Generally from roughing to roll and be the cooling operation of rolling, surface temperature decreases, and is about 40～60 ℃; Steel billet heart portion variations in temperature is little, and pre-final rolling temperature is not additionally control also, is as the criterion with normal rolling temperature rise, and the pre-general temperature rise of finish rolling process is 20～80 ℃.
(4) finish rolling
Finish rolling is carried out in mm finishing mill unit, wearing of setting entered mm finishing mill unit behind the water-cooling apparatus and carries out finish rolling before blank after pre-finish rolling passed mm finishing mill unit, blank is controlled at 750～900 ℃ in the mm finishing mill unit inlet temperature, this temperature is controlled by wearing water-cooling apparatus, has the automatic closed loop temperature control system on the water-cooling apparatus and wear, temperature control precision ± 10 ℃.
The purpose of temperature control is that the operation of rolling is carried out in critical austenitic area in the finish rolling process, as carbon steel material, promptly Ae3 and Ar3 temperature range are rolled, adopt the distortion of single pass large deformation or multi-pass accumulative total, deformation induced ferrite transformation will take place in deformation process, the ferrite grain size that generates in this temperature deformation is evenly tiny, the further temperature of control blank in subsequently distortion and cooling procedure, suppress growing up of ferrite crystal grain, final uniform ferrite, the pearlite fine grain structure of obtaining obtains higher material combination property.In the finish rolling process, the temperature between the mm finishing mill unit mid frame is not controlled.
(5) subtract sizing
Subtracting sizing carries out in the reducing sizing mill group, blank after finish rolling pass be provided with before the reducing sizing mill group wear water-cooling apparatus after, enter the reducing sizing mill group and subtract sizing, the inlet temperature that blank enters the reducing sizing mill group is 750～900 ℃, the purpose of controlling this temperature is the temperature rise that suppresses after the distortion, prevents that crystallite dimension from growing up; This temperature is controlled by wearing water-cooling apparatus, temperature control precision ± 10 ℃.
(6) weave silk
Weave silk and on Laying head, carry out, the blank after subtracting sizing pass be provided with before the Laying head wear water-cooling apparatus after, by pinch roll, enter Laying head again and carry out final band and help the reinforcing bar formation rolling.The outlet temperature of stocking is controlled at 600～880 ℃, and this temperature controlling purpose is the temperature rise that suppresses to roll the back reinforcing bar, prevents that crystallite dimension from growing up.
(7) cooling
Through the moulding Ribbed Bar that Laying head is weaved silk, go out Laying head after, enter the Stevr air-cooled line that rubs immediately and cool off, be chilled to below 200 ℃.It is 50～100m/s that the moulding Ribbed Bar enters the Stevr air-cooled line inlet roller table speed that rubs, cooling procedure need be controlled cooling velocity, cooling velocity is implemented by blower fan quantity and blower fan opening degree that the control Stevr rubs on the air-cooled line, blower fan quantity is controlled at 9～14, the blower fan opening degree is controlled at 90%～100% scope, and the control cooling velocity is no longer to grow up for the crystallite dimension of the moulding Ribbed Bar of weaving silk through Laying head.
(8) collection volume and packing
The band of moulding helps reinforcing bar after Stevr rubs the cooling of air-cooled line, enters the collection reel and curls bundledly, enters baling press immediately again, helps reinforcing bar to pack to the bundled band of rolling, so far finishes and is with the whole production technology that helps reinforcing bar.
The Ribbed Bar that adopts Ribbed Bar production equipment of the present invention and production method thereof to produce; its microscopic structure is ferrite+pearlite; be fine grain or ultra-fine grain; crystallite dimension is 2～5 μ m; have higher intensity and good plasticity and toughness; such as production common straightcarbon steel Ribbed Bar; its yield strength is more than 440MPa; tensile strength is more than 600MPa; percentage elongation is more than 25%; clod wash, recurvation performance satisfy the GB1499 standard fully, and have good plasticity and toughness and welding performance.
Compared with prior art, the present invention has following advantage:
1. Ribbed Bar production equipment of the present invention and production method thereof can significantly improve the intensity and the plasticity and toughness of Ribbed Bar, such as production common straightcarbon steel Ribbed Bar, its yield strength can be brought up to more than the 440MPa, tensile strength is brought up to more than the 60MPa, percentage elongation is more than 25%, and clod wash, recurvation performance satisfy the GB1499 standard fully, and has good plasticity and toughness and welding performance.
2. owing to can significantly improve the intensity and the plasticity and toughness of Ribbed Bar, promptly improved the potential performance of product, improved economic benefit of enterprises so can save entreprise cost greatly.
3. the Ribbed Bar of being produced excellent performance not only, and stable performance, even tissue has and economizes on resources and the advantage of environmental protection, meets the strategy of sustainable development.
Now the invention will be further described by accompanying drawing
Description of drawings
Accompanying drawing 1 is produced the structural representation of equipment for Ribbed Bar of the present invention.
Find out the Ribbed Bar production that method for producing steel bar with rib of the present invention utilizes from accompanying drawing 1 Device is by feeding platform 1, heating furnace 2, roughing unit 3, intermediate mill 5, pre-finishing mill group 6, Chuan Shui Cooling device 7, mm finishing mill unit 8, wear water-cooling apparatus 9, reducing sizing mill group 10, wear water-cooling apparatus 11, rub air-cooled line 14, collection reel 15, baling press 16 of pinch roll 12, the unit 13 of weaving silk, Stevr Form, and be connected in turn on the production line by the operation roller-way 4 that is rolled workpiece.
Wear and have the automatic closed loop temperature control system on the water- cooling apparatus 4,6,8, so that control is rolled The cooling velocity of workpiece, thus the rolling temperature of being rolled workpiece further controlled. Wear water- cooling apparatus 4,6, 8 control respectively and are rolled that workpiece enters mm finishing mill unit 5, reducing sizing mill group 7, the entrance temperature of the unit 10 of weaving silk Degree.
The specific embodiment
Embodiment
Adopt Ribbed Bar production method of the present invention, produced 4 batches of Ribbed Bar, and carry out in batches.The chemical analysis of 4 batches of Ribbed Bar steel grades is as shown in table 1.The steel billet of 4 lot numbers heats through heating furnace, and after the heating furnace release, enter successively immediately in the roughing of roughing unit, the middle milling train group roll, that the pre-finish rolling of pre-finishing mill group, mm finishing mill unit finish rolling, reducing sizing mill group subtract sizing, the unit of weaving silk is finished final finished is rolling, with air-cooled line air cooling after Stevr rubs, enter the collection reel again and curl and the baling press packing, finish whole process of production continuously.In the rolling production process, each process have related parameter as shown in table 2.After production process is finished, take a sample from finished product, carry out mechanical properties test and metallographic structure respectively and detect, its result lists in the table 3.
In order to contrast, to have enumerated a stove in the relevant technological parameter and the mechanical property that have the common straightcarbon steel Ribbed Bar of being produced on the high-speed rod-rolling mill production line now, and will have related parameter to list in relevant table 1, table 2 and the table 3 respectively.
By contrast, find out from the data of table 3, the Ribbed Bar that adopts production method of the present invention to produce, not only the crystal grain of microscopic structure is tiny, and the mechanical property excellence.
The chemical analysis (wt%) of table 1 embodiment steel billet
Table 2 embodiment steel billet has a related parameter in the operation of rolling
The mechanical property and the grain size of table 3 embodiment Ribbed Bar finished product
Claims (3)
1. Ribbed Bar production method, it is characterized in that: this production method is the method for carrying out continuous rolling on the Ribbed Bar process units, i.e. the technological process of this production method comprise heating, roughing, in roll, pre-finish rolling, finish rolling, subtract sizing, weave silk, cool off, collect volume and pack; Promptly through the heating after steel billet, after the heating furnace release, entering the roughing unit immediately successively, to carry out that roughing, middle milling train group are rolled in carrying out, the pre-finishing mill group is carried out pre-finish rolling, mm finishing mill unit is carried out finish rolling, the reducing sizing mill group subtracts sizing, the unit of weaving silk carries out final molding rolling, after Stevr rubs air-cooled line air cooling, entering the collection reel again curls and the baling press packing, finish whole process of production continuously, wherein:
1. billet heating temperature is 900～1050 ℃;
2. roughing temperature is controlled at 840～1000 ℃;
3. roll in and the additionally control of pre-final rolling temperature, in roll self temperature that temperature is a blank after the roughing, pre-final rolling temperature rolls self temperature of back blank in being;
4. blank is controlled at 750～900 ℃ in the temperature of mm finishing mill unit inlet;
5. to enter the inlet temperature of reducing sizing mill group be 750～900 ℃ to blank;
6. stocking is controlled at 600～880 ℃ in the outlet temperature of Laying head;
7. stocking enters the Stevr air-cooled line that rubs and is chilled to below 200 ℃, it is 50～100m/s that stocking enters the Stevr air-cooled line inlet roller table speed that rubs, by control Stevr rub blower fan quantity and blower fan opening degree control cooling velocity on the air-cooled line, blower fan quantity is controlled at 9～14, and the blower fan opening degree is controlled at 90%～100% scope.
2. Ribbed Bar production method according to claim 1, it is characterized in that by wearing water-cooling apparatus and automatic closed loop temperature control system thereof before each rolling unit, control the inlet temperature of blank respectively, and stocking is in the outlet temperature of Laying head in mm finishing mill unit and reducing sizing mill group.
3. according to claim 1,2 described Ribbed Bar production methods, it is characterized in that temperature control precision is ± 10 ℃.
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| CNA2006101143953A CN101185938A (en) | 2006-11-09 | 2006-11-09 | Method for producing steel bar with rib |
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| CN102443687A (en) * | 2011-11-16 | 2012-05-09 | 钢铁研究总院 | Microstructure component controlling method for raising yield ratio of fine grain reinforced bar |
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