CN110695083A - Production equipment for non-heating high-strength steel - Google Patents
Production equipment for non-heating high-strength steel Download PDFInfo
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- CN110695083A CN110695083A CN201911004552.9A CN201911004552A CN110695083A CN 110695083 A CN110695083 A CN 110695083A CN 201911004552 A CN201911004552 A CN 201911004552A CN 110695083 A CN110695083 A CN 110695083A
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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
- B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to a production device of a non-heating high-strength steel, which is used for manufacturing the steel with the yield strength of 400Mpa or 500Mpa by smelting steel billets by a scrap steel electric furnace. The invention adopts the heating-free direct rolling of the deformed steel bar, can save fuel and reduce energy consumption.
Description
Technical Field
The invention relates to the field of production and manufacturing of steel bars, in particular to a production device of a non-heating high-strength steel.
Background
The method for producing high-strength steel in the prior art comprises waste heat quenching and fine grain strengthening. The waste heat quenching cost is low, but the welding performance is poor, the brittle-tough transition temperature is high, and the production is forbidden in China; the deformed steel bar is produced by adopting a grain refining technology, the deformation temperature of the steel bar is controlled to be close to the temperature of A3 phase transformation point (750-850 ℃), the purpose of refining grains is achieved by applying a certain deformation amount, and then the grains are inhibited from growing up by fast cooling, so that the deformed steel bar obtains higher strength and toughness; the technology requires a higher rolling speed and larger rolling deformation, so that the rolling mill has higher capacity, higher motor power and energy consumption, and higher temperature control precision of rolled pieces.
Disclosure of Invention
The invention aims to solve the technical problem of providing a production device of non-heating high-strength steel which takes a steel billet smelted by a steel scrap electric furnace as a raw material.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a no production facility that heats steel that excels in for adopt scrap steel electric furnace to smelt steel of steel billet preparation yield strength 400Mpa or 500Mpa, including the conticaster that connects gradually, divide steel device, heat preservation roll table, marching type heating export roll table, roughing mill group, well bundle unit and finishing mill group, be equipped with first flying shear between roughing mill group and the well bundle unit, be equipped with the second flying shear between well bundle unit and the finishing mill group, finishing mill group end is equipped with third flying shear and water-through cooling device, water-through cooling device is connected with the cold bed, the scale cold shear is connected to the cold bed.
In the scheme, the rough rolling unit is a six-frame horizontally-vertically-alternating rough rolling unit.
In the scheme, the intermediate mill unit is six intermediate mill units which are horizontally and vertically alternated.
In the scheme, the finishing mill group is a six-frame finishing mill group which is horizontally and vertically alternated.
In the scheme, the cooling bed is provided with the heat-insulating cover, and the heat-insulating cover is connected with the hydraulic control connecting rod.
In the scheme, the inclination angle of the front-section input roller way of the cooling bed is gradually increased from 0 degree of the inlet to 15 degrees of the tail.
The production equipment of the non-heating high-strength steel has the following beneficial effects:
the invention adopts a non-heating low-temperature rolling technology, the steel billet directly enters the rolling mill set through the steel separating device, the heat preservation roller way and the stepping heating outlet roller way without being heated by the heating furnace, thereby effectively saving the investment of heating furnace equipment and fuel, reducing the energy consumption and the metal oxidation burning loss and lowering the production cost. Compared with a conventional bar and wire mill, the energy consumption per ton of steel production is about 650 kW.h, wherein about 520 kW.h is used for heating the billet to 1150 ℃, while the energy consumption for rolling is only 110 kW.h. However, the physical heat per ton of billet at this temperature is only 230 kW.h, and the heat loss of the heating furnace exceeds 50%. Therefore, the deformed steel bar is directly rolled without heating, so that the fuel can be saved and the energy consumption can be reduced.
Drawings
FIG. 1 is a schematic view of a production facility for a non-heated high-strength steel material;
FIG. 2 is a schematic structural view of a cooling bed heat-insulating cover;
FIG. 3 is a schematic structural diagram of a front-end run-in table of the cooling bed.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, specific embodiments of the present invention will now be described in detail.
As shown in figure 1, the invention discloses a production device of a non-heating high-strength steel, which is used for manufacturing the steel with the yield strength of 400Mpa or 500Mpa by smelting steel billets by a scrap steel electric furnace, and comprises a continuous casting machine, a steel separating device, a heat preservation roller way 1, a stepping heating outlet roller way, a roughing mill group 4, a medium-speed rolling mill group 5 and a finishing mill group 6 which are connected in sequence.
A first flying shear 7 is arranged between the roughing mill group 4 and the intermediate rolling mill group 5, a second flying shear 8 is arranged between the intermediate rolling mill group 5 and the finishing mill group 6, a third flying shear 10 and a water-through cooling device 9 are arranged at the tail end of the finishing mill group 6, the water-through cooling device 9 is connected with a cooling bed 11, and the cooling bed 11 is connected with a sizing cold shear 12. In this embodiment, the rough rolling unit 4 is a six-stand horizontally-alternating rough rolling unit, the intermediate rolling unit 5 is a six-stand horizontally-alternating intermediate rolling unit, and the finishing rolling unit 6 is a six-stand horizontally-alternating finishing rolling unit.
Preferably, as shown in fig. 2, a heat-insulating cover 14 is arranged on the cooling bed 11, and the heat-insulating cover 14 is connected with the hydraulic control connecting rod 15. The equipment of the invention can be used for producing the non-heating building anti-seismic deformed steel bar and can also be used for producing the spring flat steel of the automobile and the motorcycle. Because the cooling mode is different in the production process of the two products, the deformed steel bar cooling bed can adopt natural cooling without a heat-insulating cover, and the spring flat steel needs to be slowly cooled and needs the heat-insulating cover. The other two products have different section shapes, the section of the deformed steel bar is basically circular, and the section of the flat spring steel bar is rectangular, so that the deformed steel bar and the flat spring steel bar are different in collection modes, and a lifting roller table is required to convey the flat spring steel bar to a collection area different from the deformed steel bar.
Preferably, as shown in fig. 3, the inclination angle of the front input roller table of the cooling bed 11 can be gradually increased from 0 ° at the inlet to 15 ° at the tail.
The invention also provides a production method of the non-heating high-strength steel, which is used for manufacturing the steel with the yield strength of 400Mpa or 500Mpa and comprises the following steps:
s1, cutting 150-180 mm steel billets by a continuous casting machine, controlling the temperature to be 910-930 ℃, sending the steel billets into a quick heat preservation roller way 1 through a steel distribution device, entering an outlet roller way of a stepping heating furnace, sending the steel billets to a six-frame horizontally-vertically-alternating roughing mill set 4 at 840-860 ℃ to be rolled into rough rolling square billets, and then cutting heads and removing tails by flying shears;
s2, sending the rough-rolled square billets into six horizontal and vertical alternative intermediate rolling mill groups 5 to roll round billets, and then cutting heads and removing tails by flying shears;
s3, conveying the round blank into six horizontal and vertical alternative finishing mill groups 6, rolling the round blank into a finished product round with the temperature of 990-1010 ℃, shearing the round blank by a flying shear according to a multiple length of the finished product, passing through a water cooling device 9, then cooling the round blank at the temperature of 590-610 ℃, conveying the round blank into a cooling bed 11 for cooling, shearing the round blank to the required length by a fixed-length cold shear 12, counting the crossing, collecting, bundling, weighing and warehousing the round blank by a bundling and weighing device 13.
In the step S3, the water supply amount in the water cooling device 9 is 550 to 560t/h, the maximum water supply pressure is 1.8 to 2.0MPa, and the water cooling cools the surface of the steel bar immediately after the steel bar is hot-rolled. For the reinforcing steel bar with the phi of 12-phi 50mm, the surface cooling speed can reach 800-1000 ℃/s.
The steel bar microalloy with the yield strength of 400Mpa comprises the following components in percentage by mass: c: 0.21 to 0.25, Mn: 1-1.50, Si: 0.3-0.6, P: 0-0.022, S: 0-0.026, Cu: 0.1 to 0.14, Ni: 0.03 to 0.1, Cr: 0.05-0.1, V: 0.02-0.035, and the balance of Fe and inevitable impurities.
The steel bar microalloy with the yield strength of 500Mpa comprises the following components in percentage by mass: c: 0.21 to 0.25, Mn: 1. 1.50, Si: 0.3-0.6, P: 0-0.022, S: 0-0.026, Cu: 0.1 to 0.14, Ni: 0.03 to 0.1, Cr: 0.05-0.1, V: 0.3 to 0.9, Nb: 0. 0.02, and the balance of Fe and inevitable impurities.
The production equipment of the non-heating high-strength steel has the following characteristics:
firstly, the method comprises the following steps: the production of the deformed steel bar directly enters a quick heat-preservation conveying roller way connected with an outlet roller way of the stepping heating furnace after the billet of the continuous casting machine is cut, the other path of the billet enters a heating furnace roller way to enter the heating furnace for heating and then is subjected to heat supplementing rolling, and the continuous casting billet enters the heating furnace after being cut in two paths by a branching device.
Secondly, the method comprises the following steps: the walking beam furnace adopts a mode of end-in end-out, the opposite end of the furnace-out end on the furnace-out roller way of the furnace is connected with the continuous casting quick heat preservation roller way, and the furnace-out roller way is connected with a billet descaling device.
Thirdly, the method comprises the following steps: the whole line adopts a horizontal and vertical alternative high-rigidity short-stress-path rolling mill, the rolling mills adopt the configuration of larger rolling force and rolling moment, the roughing mills adopt 700 multiplied by 2 and 550 multiplied by 4 rolling mills, the rolling pressure is respectively about 480t and 360t, and the rolling moment is respectively about 500kNm and 300kNm, so as to meet the production requirement of rolling the deformed steel bar at low temperature; the finishing mills No. 14, No. 16 and No. 18 adopt horizontal and vertical convertible rolling mills, and the finishing mill No. 14 is a vertical rolling mill; the 16# rolling mill and the 18# rolling mill are both flat rolling mills when small-specification deformed steel bars need to be rolled for splitting, can be converted into vertical rolling mills when large-specification deformed steel bars are rolled for not splitting, and can be converted into rolling mills which are beneficial to splitting or not splitting the deformed steel bars according to different rolled products.
Fourthly: the 1#2#3# flying shear can meet the requirements of high-strength deformed steel bar on low-temperature strength, high shearing speed and high head and tail shearing. If the 1# flying shear is positioned behind the sixth 550 rolling mill, the start-stop crank-connecting rod type flying shear is adopted, and the shearing section is not less than 10000mm2(square steel 100X100mm) and a shear rate of about 0.5 to 1.4 m/s.
The invention also provides the following examples:
the process of rolling the 150mm × 150mm × 6000mm square billet into the deformed steel bar is as follows:
after a continuous casting machine cuts a steel billet, the billet is sent into a quick heat preservation roller way through a steel distribution device and enters an outlet roller way of a stepping heating furnace, the billet is sent to six horizontally and vertically alternating roughing mill sets (adopting a slotless rolling pass) at 850 ℃ to be rolled into a 65mm square, the size of the billet can be close to that of a finished product, and then a flying shear cuts the head and removes the tail.
Sending the 65mm rough rolling square billet into six horizontal and vertical alternative intermediate rolling mill sets (adopting oval-round hole patterns) to roll the rough rolling square billet into a circle of 30 mm-50 mm, and then cutting the rough rolling square billet into a head and a tail by flying shears, wherein the circle can reach the size close to a finished product.
And further feeding the 30mm circle into a six-stand horizontal and vertical alternative finishing mill group for rolling (adopting an oval-round hole pattern), wherein the temperature of the rolled finished circle is about 1000 ℃, the finished circle can reach the size close to the size of a finished product, and then shearing by a flying shear according to the length multiple of the finished product. The steel bars are cooled by water passing cooling devices (the length of each section is 4.1m, the total length is about 16m, the water supply amount is 550-560 t/h, the maximum water supply pressure is 1.8-2.0 MPa, the steel bars are subjected to hot rolling, the surface of the steel bars are immediately chilled, the surface cooling speed of the steel bars with the diameter of 12-30 mm can reach 800-1000 ℃/s) and the temperature is about-600 ℃, the steel bars are sent into a cooling bed for cooling, then the steel bars are cut to the required length by a fixed-length cold shear, and the steel bars are collected, bundled, weighed and warehoused after crossing counting.
While embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments, which are intended to be illustrative rather than limiting, and many modifications may be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The utility model provides a production facility of non-heating high strength steel for adopt the scrap steel electric furnace to smelt steel billet preparation yield strength 400Mpa or 500Mpa steel, its characterized in that, including the conticaster that connects gradually, divide steel device, heat preservation roll table, marching type heating export roll table, roughing mill group, well bundle unit and finishing mill group, be equipped with first flying shear between roughing mill group and the well bundle unit, be equipped with the second flying shear between well bundle unit and the finishing mill group, finishing mill group end is equipped with third flying shear and water-through cooling device, water-through cooling device is connected with the cold bed, the scale cold shear is connected to the cold bed.
2. The apparatus for producing a non-heated high-strength steel product as claimed in claim 1, wherein the roughing train is a six stand-up alternate roughing train.
3. The apparatus for producing a non-heated high-strength steel according to claim 1, wherein the intermediate rolling mill group is a six-stand horizontally alternate intermediate rolling mill group.
4. The apparatus for producing a non-heated high-strength steel material as claimed in claim 1, wherein the finishing mill group is a six-stand horizontally-alternating finishing mill group.
5. The production facility for a non-heated high-strength steel according to claim 1, wherein the cooling bed is provided with a heat-insulating cover, and the heat-insulating cover is connected with the hydraulic control connecting rod.
6. The apparatus for producing a high-strength non-heated steel product as claimed in claim 1, wherein the inclination of the run-in table at the front end of the cooling bed is gradually increased from 0 ° at the inlet to 15 ° at the tail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911004552.9A CN110695083A (en) | 2019-10-22 | 2019-10-22 | Production equipment for non-heating high-strength steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911004552.9A CN110695083A (en) | 2019-10-22 | 2019-10-22 | Production equipment for non-heating high-strength steel |
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| Publication Number | Publication Date |
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| CN110695083A true CN110695083A (en) | 2020-01-17 |
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| CN201911004552.9A Pending CN110695083A (en) | 2019-10-22 | 2019-10-22 | Production equipment for non-heating high-strength steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112090960A (en) * | 2020-09-14 | 2020-12-18 | 中冶南方武汉钢铁设计研究院有限公司 | Method for producing 400-500 MPa high-strength anti-seismic deformed steel bar by non-heating low-temperature slitting rolling |
| CN113198836A (en) * | 2021-06-25 | 2021-08-03 | 西安盛日机电科技有限公司 | Process for rolling small-specification deformed steel bar at high speed |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6475104A (en) * | 1987-09-14 | 1989-03-20 | Sumitomo Metal Ind | Hot rolling equipment |
| CN205324359U (en) * | 2016-01-08 | 2016-06-22 | 宝钢集团新疆八一钢铁有限公司 | Small -size merchant bar mill is fluid pressure type heat preservation cover for cold bed |
| CN205571839U (en) * | 2016-04-12 | 2016-09-14 | 武钢集团昆明钢铁股份有限公司 | Multi -functional rolling production line |
| CN106734192A (en) * | 2017-01-13 | 2017-05-31 | 中冶华天工程技术有限公司 | High intensity small dimension hot-rolled reinforced bar production equipment and its production technology |
| CN107008750A (en) * | 2017-04-20 | 2017-08-04 | 中冶南方工程技术有限公司 | The long material continuous casting and rolling production line of binary channels and its production method |
| CN209222891U (en) * | 2018-11-11 | 2019-08-09 | 宋伟 | A kind of production line of bar cold bed input cross roll road |
-
2019
- 2019-10-22 CN CN201911004552.9A patent/CN110695083A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6475104A (en) * | 1987-09-14 | 1989-03-20 | Sumitomo Metal Ind | Hot rolling equipment |
| CN205324359U (en) * | 2016-01-08 | 2016-06-22 | 宝钢集团新疆八一钢铁有限公司 | Small -size merchant bar mill is fluid pressure type heat preservation cover for cold bed |
| CN205571839U (en) * | 2016-04-12 | 2016-09-14 | 武钢集团昆明钢铁股份有限公司 | Multi -functional rolling production line |
| CN106734192A (en) * | 2017-01-13 | 2017-05-31 | 中冶华天工程技术有限公司 | High intensity small dimension hot-rolled reinforced bar production equipment and its production technology |
| CN107008750A (en) * | 2017-04-20 | 2017-08-04 | 中冶南方工程技术有限公司 | The long material continuous casting and rolling production line of binary channels and its production method |
| CN209222891U (en) * | 2018-11-11 | 2019-08-09 | 宋伟 | A kind of production line of bar cold bed input cross roll road |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112090960A (en) * | 2020-09-14 | 2020-12-18 | 中冶南方武汉钢铁设计研究院有限公司 | Method for producing 400-500 MPa high-strength anti-seismic deformed steel bar by non-heating low-temperature slitting rolling |
| CN113198836A (en) * | 2021-06-25 | 2021-08-03 | 西安盛日机电科技有限公司 | Process for rolling small-specification deformed steel bar at high speed |
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Application publication date: 20200117 |