CN111389905A - Temperature-control rolling-control technology for bar - Google Patents
Temperature-control rolling-control technology for bar Download PDFInfo
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- CN111389905A CN111389905A CN202010246583.1A CN202010246583A CN111389905A CN 111389905 A CN111389905 A CN 111389905A CN 202010246583 A CN202010246583 A CN 202010246583A CN 111389905 A CN111389905 A CN 111389905A
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- steel billet
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- steel
- temperature
- roller way
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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
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a bar temperature and rolling control process technology, which comprises the following steps: heating the steel billet by a heating furnace to raise the temperature of the steel billet to 1000-1030 ℃; sending the steel billet into a rough and medium rolling mill set, and carrying out rough rolling and medium rolling on the steel billet which is heated in the step S1; the steel billet in the S2 is sent into a pre-water penetration device, the temperature of the steel billet is controlled at 1000-1020 ℃, and the temperature rise and coarse grains are prevented after multi-pass rolling deformation of a coarse and medium mill set, so that the physical properties of the product are changed; sending the steel billet in the S3 to a finishing mill group for finish rolling; straightening the steel billet subjected to the finish rolling by a six-roller or eight-roller straightener; and sending the straightened steel billet into a scattered coil air cooling conveying roller way for air cooling. The invention has the advantages of reducing the contents of silicon and manganese elements in steel under the condition of qualified product performance, thereby reducing the production cost, reducing the initial rolling temperature, reducing the gas consumption and saving the production cost.
Description
Technical Field
The invention relates to the technical field of billet rolling, in particular to a bar temperature control and rolling control process technology.
Background
The ratio of the length to the section perimeter is quite large, the cross section is not provided with obvious convex-concave parts, the metal plastic processing straight bar product is also called bar or common section profile, and comprises square, round, flat and hexagonal profiles, the new national standard release can fundamentally block the market circulation of the water-through reinforcing steel bars, and the requirements on alloy elements are increased to a certain extent: the new national standard of the deformed steel with the number of GB/T1499.2-2018 is released in 2018, 2 and 6 months, and is formally implemented in 2018, 11 and 1 months. The largest change of the new national standard belongs to the field of a method for detecting macroscopic metallographic phase, section Vickers hardness and microstructure added to metallographic structure detection regulations and matched with the metallographic structure detection regulations. The implementation of the regulation can thoroughly block the market circulation of the steel bars with surface strengthening by using the water penetration process, and meanwhile, the steel bar performance can be improved by using a method for adding alloy elements in a steel mill, so that the requirements on the alloy elements can be improved to a certain extent. The influence of the new national standard on the aspects of silicon and manganese supply and demand keeps a neutral view: through our calculation, after the new national standard is implemented, the probability of large newly-increased demand of silicomanganese in the month is maintained to be about 4 ten thousand tons, and because the current operating rate and the capacity utilization rate of the whole silicomanganese industry have certain rising spaces, and a large number of projects including 300 ten thousand tons of ferroalloy projects produced annually by Ji iron Ji charcoal in the next half year are put into operation, the newly-increased demand of the part can be basically met. After the new national standard is implemented, the average cost of the thread steel per ton rises from 70 yuan to 100 yuan: through our calculation, after the new national standard is implemented, the average cost of the thread is increased from 70 yuan/ton to 100 yuan/ton due to the increase of the addition of alloy elements such as Mn, V and the like. Wherein, the cost increased by adding Mn element is about 18-30 yuan/ton, accounting for about 25-30%; the added V element increases the cost by about 52-74 yuan/ton, and accounts for about 70-75%. The implementation of the new national standard leads the average cost center of the deformed steel bar to be shifted upwards to a certain extent, and the cost is obviously increased for steel mills using the water passing process in a large area.
The common alloy elements in the existing steel products are mainly divided into two categories; non-carbide forming elements and carbide forming elements. Wherein the non-carbide forming elements include; co, Ni, Cu, Si, Al, carbide-forming elements including Zr, Nb, V, Ti, W, Mo, Cr, Mn, Fe. The silicon element can improve the strength of solid solution in the steel and the cold working hardening degree, so that the toughness and the plasticity of the steel are reduced, and the corrosion resistance of the steel is improved; the manganese element can improve the hardenability of the steel and improve the high-temperature instantaneous strength of the steel. After the new national standard is released, higher requirements are made on alloy elements in steel, the product cost is increased, and the content of the alloy elements in steel billets cannot be realized by using the original process for production, so that the product performance is influenced.
Disclosure of Invention
The invention aims to provide a bar temperature control and rolling control process technology, which has the advantages of reducing the content of silicon and manganese elements in steel under the condition of qualified product performance, thereby reducing the production cost, reducing the initial rolling temperature, reducing the gas consumption and saving the production cost, and solves the problems that after the new national standard is released, higher requirements on alloy elements in steel are required, the product cost is increased, and the content of the alloy elements in steel billets cannot be realized by using the original process production, so that the product performance is influenced.
In order to achieve the purpose, the invention provides the following technical scheme: a bar temperature control and rolling control process technology comprises the following steps:
s1, heating the steel billet by a heating furnace to raise the temperature of the steel billet to 1000-1030 ℃;
s2, sending the steel billet into a rough and medium mill group, and carrying out rough rolling and medium rolling on the steel billet which is heated in the step S1;
s3, sending the steel billet in the S2 into a pre-water penetration device, controlling the temperature of the steel billet at 1000-1020 ℃, and preventing the steel billet from being deformed by multi-pass rolling of a rough and medium mill set, wherein the temperature is increased to cause coarse grains and change the physical properties of the product;
s4, sending the billet steel in the S3 to a finishing mill group for finish rolling;
s5, straightening the finish-rolled steel billet by a six-roller or eight-roller straightener;
and S6, sending the straightened steel billet into a scattered coil air cooling conveying roller way for air cooling.
Preferably, the content of Si and Mn in the steel billet in the S1 is reduced from the original content of Si0.45-0.55 and Mn1.45-1.55 to the content of Si0.40-0.50 and the content of Mn1.35-1.45, the content of the other inevitable trace elements is not changed, and the content of Fe in the steel billet is correspondingly increased by the content of Si and Mn.
Preferably, three temperature control areas are arranged in the heating furnace, and the temperature interval and the time are respectively 350 ℃ for 30min, 700 ℃ for 20min and 1050 ℃ for 30 min.
Preferably, the scattered coil air-cooling transportation roller way is provided with thirteen roller ways, each roller way can be independently set with a speed according to needs, and the adjustment range of the running speed is 0.1-2 cm/s.
Preferably, the roller way of the bulk roll air-cooling transportation roller way is provided with a heat preservation cover from the second section roller way to the eleventh section roller way, and the opening or the closing of the heat preservation cover can be selected according to the requirements of steel types.
Preferably, 16 fans are uniformly arranged in the whole section of the scattered coil air-cooling transportation roller way, a louvered air door is arranged at the inlet of each fan, and the air volume of each fan can be adjusted by adjusting the opening degree of the air door of each fan according to the characteristics of steel, so that the effects of selecting three modes of standard cooling, delayed cooling and forced cooling are achieved.
Compared with the prior art, the invention has the beneficial effects that: through the three temperature control areas, the temperature difference between the inside and the outside of the steel billet and the temperature difference of the section of the steel billet are increased and then reduced along with the heating time in the heating process, and through the three temperature control areas, the heating temperature can be accurately controlled, so that the requirement of a heating process can be met, and the energy consumption can be reduced. The overheating or overburning of part of the steel billet can be reduced;
the rough and medium rolled steel billet is sent into a pre-water penetration device for cooling, and the temperature control in the rolling process can refine grains, obtain uniform ideal structure and improve the strength and mechanical property of the steel, so that the manufacturing cost is greatly saved, the grains are prevented from being rough, the aims of refining the grains and improving the strength are fulfilled, and the gas consumption and the oxidation burning loss are reduced;
through setting up the scattered roll air cooling transportation roll table, scattered roll air cooling transportation roll table whole section disposes 16 fans evenly, and there is the venetian blind type air door in every fan entrance, can adjust the amount of wind of fan according to the characteristics of steel grade adjusting fan air door to reach the effect of selection standard cooling, postpone cooling, forced cooling three kinds of modes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc., indicate orientations or positional relationships based on the illustrated orientations or positional relationships, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment provided by the invention comprises the following steps: a bar temperature control and rolling control process technology comprises the following steps:
s1, heating the steel billet by a heating furnace to raise the temperature of the steel billet to 1000-plus 1030 ℃, reducing the contents of Si and Mn in the steel billet in S1 from the original contents of Si0.45-0.55 and Mn1.45-1.55 to Si0.40-0.50 and Mn1.35-1.45, keeping the contents of other inevitable trace elements unchanged, correspondingly increasing the content of Fe in the steel billet to reduce the contents of Si and Mn, arranging three temperature control areas in the heating furnace, wherein the temperature intervals are 0-350 ℃, 350-plus 700 ℃ and 700-plus 1050 ℃, setting the three temperature control areas of the heating furnace, increasing and then reducing the temperature difference between the inside and the outside of the steel billet and the temperature difference of the section of the steel billet along with the heating time in the heating process, and accurately controlling the heating temperature by the three temperature control areas to meet the requirements of the heating process and reduce the energy consumption. The overheating or overburning of part of the steel billet can be reduced;
s2, sending the steel billet into a rough and medium mill group, and carrying out rough rolling and medium rolling on the steel billet which is heated in the step S1;
s3, the steel billet in the S2 is sent to a pre-water penetration device, the temperature of the steel billet is controlled to be in the range of 1000-1020 ℃, the situation that the steel billet is thickened due to temperature rise after being rolled and deformed by a rough and medium mill for multiple times is avoided, the physical performance of the product is changed, the steel billet rolled in the rough and medium process is sent to the pre-water penetration device to be cooled, the temperature control in the rolling process can refine grains, obtain uniform ideal structure, improve the strength and mechanical performance of steel, greatly save the manufacturing cost, prevent the grains from being thickened, and achieve the purposes of refining the grains and improving the strength, so that the gas consumption and the oxidation burning loss are reduced;
s4, sending the billet steel in the S3 to a finishing mill group for finish rolling;
s5, straightening the finish-rolled steel billet by a six-roller or eight-roller straightener;
s6, sending the straightened steel billet into a random coil air-cooling transportation roller way for air cooling, wherein the random coil air-cooling transportation roller way is provided with thirteen roller ways, each roller way can be independently set with a speed according to needs, the operation speed adjusting range is 0.1-2 cm/S, the roller ways of the random coil air-cooling transportation roller way are provided with heat-insulating covers from the second roller way to the eleventh roller way, the heat-insulating covers can be selected to be opened or closed according to the needs of steel types, 16 fans are uniformly arranged at the whole sections of the random coil air-cooling transportation roller way, a shutter type air door is arranged at the inlet of each fan, and the air volume of the fans can be adjusted according to the opening degree of the fan air door according to the characteristics of the steel types so as to achieve the effects of selecting three modes.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (6)
1. A bar temperature control and rolling control process technology is characterized by comprising the following steps:
s1, heating the steel billet by a heating furnace to raise the temperature of the steel billet to 1000-1030 ℃;
s2, sending the steel billet into a rough and medium mill group, and carrying out rough rolling and medium rolling on the steel billet which is heated in the step S1;
s3, sending the steel billet in the S2 into a pre-water penetration device, controlling the temperature of the steel billet at 1000-1020 ℃, and preventing the steel billet from being deformed by multi-pass rolling of a rough and medium mill set, wherein the temperature is increased to cause coarse grains and change the physical properties of the product;
s4, sending the billet steel in the S3 to a finishing mill group for finish rolling;
s5, straightening the finish-rolled steel billet by a six-roller or eight-roller straightener;
and S6, sending the straightened steel billet into a scattered coil air cooling conveying roller way for air cooling.
2. The bar temperature control and rolling control process technology according to claim 1, characterized in that: the content of Si and Mn in the steel billet in the S1 is reduced from the original content of Si0.45-0.55 and Mn1.45-1.55 to the content of Si0.40-0.50 and Mn1.35-1.45, the content of the other inevitable trace elements is not changed, and the content of Fe in the steel billet is correspondingly increased by the content of Si and Mn.
3. The bar temperature control and rolling control process technology according to claim 1, characterized in that: three temperature control areas are arranged in the heating furnace, and the temperature interval and the time are respectively 350 ℃ for 30min, 700 ℃ for 20min and 1050 ℃ for 30 min.
4. The bar temperature control and rolling control process technology according to claim 1, characterized in that: the uncoiling air-cooling transportation roller way is provided with thirteen roller ways, each roller way can be independently set with speed according to needs, and the adjustment range of the running speed is 0.1-2 cm/s.
5. The bar temperature control and rolling control process technology according to claim 4, characterized in that: the roller way of the scattered coil air cooling transportation roller way is provided with a heat preservation cover from the second section roller way to the eleventh section roller way, and the opening or the closing of the heat preservation cover can be selected according to the requirements of steel types.
6. The bar temperature control and rolling control process technology according to claim 1, characterized in that: 16 fans are uniformly arranged in the whole section of the uncoiling air-cooling transportation roller way, a louvered air door is arranged at the inlet of each fan, and the air quantity of each fan can be adjusted by adjusting the opening degree of the air door of each fan according to the characteristics of steel, so that the effects of selecting three modes of standard cooling, delayed cooling and forced cooling are achieved.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010246583.1A CN111389905A (en) | 2020-03-31 | 2020-03-31 | Temperature-control rolling-control technology for bar |
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| CN202010246583.1A CN111389905A (en) | 2020-03-31 | 2020-03-31 | Temperature-control rolling-control technology for bar |
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