CN110695084A - Production method of non-heating high-strength steel - Google Patents
Production method of non-heating high-strength steel Download PDFInfo
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- CN110695084A CN110695084A CN201911004658.9A CN201911004658A CN110695084A CN 110695084 A CN110695084 A CN 110695084A CN 201911004658 A CN201911004658 A CN 201911004658A CN 110695084 A CN110695084 A CN 110695084A
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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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- 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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- 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 method for producing high-strength steel without heating, which is used for manufacturing steel with yield strength of 400Mpa or 500Mpa by smelting steel billets by using a scrap steel electric furnace, and comprises the following steps: s1, after the billet is cut by the continuous casting machine, the billet is sent into a quick heat preservation roller way through a steel splitting device, enters an outlet roller way of the stepping heating furnace, is sent to six horizontally and vertically alternating roughing mill sets to be rolled into a roughing square billet, and the head and the tail of the billet are cut by flying shears; s2, sending the rough-rolled square billets into six horizontal and vertical alternative intermediate rolling mill groups for rolling round billets, and then cutting heads and removing tails by flying shears; and S3, sending the round blank into six horizontal and vertical alternative finishing mill groups to be rolled into a finished round, shearing by flying shears according to multiple length of the finished round, sending the round blank into a cooling bed to be cooled after passing through a water cooling device, and shearing to the required length by fixed-length cold shears. The invention adopts a non-heating low-temperature rolling technology, and the billet does not need to be heated by a 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.
Description
Technical Field
The invention relates to the field of production and manufacturing of steel bars, in particular to a production method of a non-heating high-strength steel.
Background
The method for producing the high-strength deformed steel bar 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 method for producing a non-heating high-strength steel.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method for producing the non-heating high-strength steel is used for smelting steel billets by using a scrap steel electric furnace, and the steel with the yield strength of 400Mpa or 500Mpa 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 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 at 840-860 ℃ to be rolled into rough rolling square billets, and then cutting heads and tails by flying shears;
s2, sending the rough-rolled square billets into six horizontal and vertical alternative intermediate rolling mill groups for rolling 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, rolling the round blank into a finished product round at the temperature of 990-1010 ℃, shearing the round blank by a flying shear according to a multiple length of the finished product, cooling the round blank by a water cooling device to the temperature of 590-610 ℃, conveying the round blank into a cooling bed for cooling, shearing the round blank to the required length by a fixed-length cold shear, counting the crossing number, collecting, bundling, weighing and warehousing.
In the scheme, in the step S3, the water supply amount in the water cooling device is 550-560 t/h, the maximum water supply pressure is 1.8-2.0 MPa, and the surface of the steel bar is chilled immediately after the steel bar is hot-rolled by the water cooling.
In the scheme, for the reinforcing steel bars with the phi of 12-phi 50mm, the surface cooling speed can reach 800-1000 ℃/s.
In the scheme, 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.
In the scheme, 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 method of the non-heating high-strength steel has the following beneficial effects:
1. the invention adopts a non-heating low-temperature rolling technology, and the billet does not need to be heated by a 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.
2. The invention replaces 335MPa deformed steel with 400MPa deformed steel, which saves at least 20% of steel consumption, replaces 400MPa with 500MPa, and saves 15% of steel consumption. In 2010, the total yield of the reinforcing steel bars in China is about 1.31 hundred million tons, wherein the yield of the high-strength reinforcing steel bars with the pressure of 400MPa or more is only 5700 ten thousand tons, which only accounts for 40 percent, and the rest 60 percent is still 335 MPa. If the high-strength steel bars with the strength of 400MPa and above are used for replacing the steel bars with the strength of 335MPa, the consumption of the steel bars can be reduced by more than 1000 million tons every year, correspondingly, the consumption of iron ore can be reduced by more than 1700 million tons every year, the energy consumption can be reduced by more than 600 million tons of standard coal, the emission of atmospheric pollutants such as smoke dust and sulfur dioxide can be reduced by 2000 million tons, the economic and social benefits are remarkable, and the construction of the two types of society is facilitated.
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.
The invention discloses a method for producing high-strength steel without heating, which is used for manufacturing steel with yield strength of 400Mpa or 500Mpa by smelting steel billets by using a scrap steel electric furnace, 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 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 at 840-860 ℃ to be rolled into rough rolling square billets, and then cutting heads and tails by flying shears;
s2, sending the rough-rolled square billets into six horizontal and vertical alternative intermediate rolling mill groups for rolling 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, rolling the round blank into a finished product round at the temperature of 990-1010 ℃, shearing the round blank by a flying shear according to a multiple length of the finished product, cooling the round blank by a water cooling device to the temperature of 590-610 ℃, conveying the round blank into a cooling bed for cooling, shearing the round blank to the required length by a fixed-length cold shear, counting the crossing number, collecting, bundling, weighing and warehousing.
In the step S3, the water supply amount in the water cooling device is 550-560 t/h, the maximum water supply pressure is 1.8-2.0 MPa, and the water cooling device chills 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 method 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.
Feeding the 65mm rough rolling square blank into six horizontal and vertical alternative intermediate rolling units (adopting oval-round hole patterns) to roll the rough rolling square blank into a 30 mm-50 mm circle, and then cutting the rough rolling square blank into a head and a tail by using flying shears.
And then further feeding the 30mm round into a six-stand flat-vertical alternative finishing mill group for rolling (adopting an oval-round hole pattern), wherein the temperature of the finished product round is about 1000 ℃, the finished product round can reach the size close to the size of a finished product, and then shearing by using 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 (5)
1. A production method of a non-heating high-strength steel is used for manufacturing a steel with yield strength of 400Mpa or 500Mpa, and is characterized by comprising 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 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 at 840-860 ℃ to be rolled into rough rolling square billets, and then cutting heads and tails by flying shears;
s2, sending the rough-rolled square billets into six horizontal and vertical alternative intermediate rolling mill groups for rolling 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, rolling the round blank into a finished round product at the temperature of 990-1010 ℃, shearing the round product by a flying shear according to a multiple length of the finished round product, conveying the round blank into a cooling bed for cooling after passing through a water cooling device at the temperature of 590-610 ℃, and shearing the round blank to the required length by a fixed-length cold shear.
2. The method for producing a non-heated high-strength steel product as claimed in claim 1, wherein in step S3, the water supply amount in the water-through cooling device is 550 to 560t/h, the maximum water supply pressure is 1.8 to 2.0MPa, and the surface of the steel bar is chilled immediately after the hot rolling of the steel bar by the water-through cooling.
3. The method for producing a non-heated high-strength steel according to claim 2, wherein the surface cooling rate for a reinforcing steel bar having a diameter of from Φ 12 to Φ 50mm is up to 800 to 1000 ℃/s.
4. The method for producing a non-heated high-strength steel material as claimed in claim 1, wherein the microalloyed steel bar having a 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.
5. The method for producing a non-heated high-strength steel material as claimed in claim 1, wherein the microalloyed steel bar having a 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911004658.9A CN110695084A (en) | 2019-10-22 | 2019-10-22 | Production method of non-heating high-strength steel |
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| CN201911004658.9A CN110695084A (en) | 2019-10-22 | 2019-10-22 | Production method of non-heating high-strength steel |
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Cited By (1)
| 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 |
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| CN108754334A (en) * | 2018-07-25 | 2018-11-06 | 包头钢铁（集团）有限责任公司 | 500MPa grades of antidetonation atmospheric corrosion resistance reinforcing bars and its manufacturing method |
| CN109023040A (en) * | 2018-07-24 | 2018-12-18 | 包头钢铁（集团）有限责任公司 | 400MPa grades of antidetonation atmospheric corrosion resistance reinforcing bars and its manufacturing method |
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2019
- 2019-10-22 CN CN201911004658.9A patent/CN110695084A/en active Pending
Patent Citations (7)
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|---|---|---|---|---|
| EP0876856A2 (en) * | 1997-05-08 | 1998-11-11 | Sms Schloemann-Siemag Aktiengesellschaft | High performance wire rolling mill |
| CN103480647A (en) * | 2013-09-18 | 2014-01-01 | 陕西钢铁集团有限公司 | Device and method for manufacturing reinforcing steel bars by means of directly rolling small square billets at low temperatures without heating |
| CN203955703U (en) * | 2014-06-18 | 2014-11-26 | 中冶南方工程技术有限公司 | A kind of fine grain screw-thread steel hot rolling line |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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