CN112828033A - Low-temperature-resistant steel bar rolling process scheme - Google Patents
Low-temperature-resistant steel bar rolling process scheme Download PDFInfo
- Publication number
- CN112828033A CN112828033A CN202011636271.8A CN202011636271A CN112828033A CN 112828033 A CN112828033 A CN 112828033A CN 202011636271 A CN202011636271 A CN 202011636271A CN 112828033 A CN112828033 A CN 112828033A
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- Prior art keywords
- temperature
- rolling
- steel bar
- low
- controlled
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 76
- 239000010959 steel Substances 0.000 title claims abstract description 76
- 238000005096 rolling process Methods 0.000 title claims abstract description 66
- 238000001816 cooling Methods 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 30
- OGSYQYXYGXIQFH-UHFFFAOYSA-N chromium molybdenum nickel Chemical compound [Cr].[Ni].[Mo] OGSYQYXYGXIQFH-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000006698 induction Effects 0.000 claims abstract description 11
- 238000004886 process control Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 230000017525 heat dissipation Effects 0.000 claims description 12
- 238000002791 soaking Methods 0.000 claims description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000003949 liquefied natural gas Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
-
- 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
-
- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
Abstract
The invention discloses a low-temperature resistant steel bar rolling process scheme, wherein the low-temperature resistant steel bar is made of nickel-chromium-molybdenum steel, the components of the nickel-chromium-molybdenum steel comprise 0.7-3.0% of Ni0.4-2.0% of Cr0.2-0.6% of Mo0.2 and less than or equal to 0.25% of C, the rolling process comprises rolling control, rolling temperature control, deformation process control and cooling control, and the steel bar rolling process flow comprises the following steps: heating, rough rolling, finish rolling and cooling, wherein the nickel-chromium-molybdenum steel is fused into a steel billet by a steel mill, enters a steel mill and is heated by induction heating, and the rolling temperature control structure comprises a temperature controller and a temperature sensor and controls the internal temperature of the induction heating furnace. The invention can accurately control the rolling process of the low-temperature resistant steel bar and improve the rolling quality of the low-temperature resistant steel bar.
Description
Technical Field
The invention relates to the technical field of low-temperature-resistant steel bars, in particular to a low-temperature-resistant steel bar rolling process scheme.
Background
The low-temperature-resistant steel bar is mainly applied to a reinforced concrete structure in a low-temperature environment, and the steel bar for the low-temperature environment at present is mainly imported, so that the cost is high. The low-temperature steel on the market at present is divided into two types, namely ferrite low-temperature steel and austenite low-temperature steel, wherein the ferrite low-temperature steel generally has obvious toughness-brittleness transition temperature, and when the temperature is reduced to a certain critical value, the toughness is suddenly reduced. The carbon steel containing 0.2% carbon has an impact value of about-20 deg.C. Therefore, the ferritic steel is not suitable for being used below the transformation temperature, and generally, alloy elements such as Mn, Ni and the like are added, so that interstitial impurities are reduced, crystal grains are refined, the size, the form, the distribution and the like of a second phase in the steel are controlled, and the toughness-brittleness transformation temperature of the ferritic steel is reduced; austenitic low temperature steels have high low temperature toughness, generally without ductile-brittle transition temperature.
Through mass search, the prior art with the publication number of CN103952625A is found, and the invention discloses a controlled rolling and controlled cooling low-temperature steel bar and a preparation method thereof, belonging to the technical field of steel rolling. The low-temperature steel bar comprises the following chemical components in percentage by mass: less than or equal to 0.12 percent of C, less than or equal to 0.50 percent of Si, less than or equal to 1.60 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.50 percent of Ni, less than or equal to 0.30 percent of Mo, less than or equal to 0.04 percent of Nb, and the balance of Fe and inevitable impurity elements. The preparation of the low-temperature steel bar comprises smelting in a converter, an electric arc furnace or other smelting furnaces, then carrying out external refining, continuously casting into a square billet (or rolling into the square billet by a cogging mill), and then carrying out rolling forming on a continuous bar mill; the rolling technological parameters are as follows: the heating temperature of the steel billet is 1000-1200 ℃, the initial rolling temperature is 950-1100 ℃, the final rolling temperature is 800-950 ℃, and water cooling is carried out after rolling, wherein the temperature of an upper cooling bed is 500-700 ℃. The product can meet the requirement of LNG and other storage tanks for building concrete structures to resist low temperature of-165 ℃, has good comprehensive performance of low-temperature steel bars, low content of alloy elements, low production cost, simple and feasible preparation process and the like.
In conclusion, in the existing low-temperature steel bar rolling process, the heating and cooling temperatures cannot be accurately controlled, so that the strength and the performance of low-temperature steel are influenced, the subsequent use is influenced, and potential safety hazards are caused.
Disclosure of Invention
The invention aims to provide a low-temperature-resistant steel bar rolling process scheme to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the low-temperature resistant steel bar rolling process scheme is characterized in that the low-temperature resistant steel bar is made of nickel-chromium-molybdenum steel, the components of the nickel-chromium-molybdenum steel comprise 0.7-3.0% of Ni0.4-2.0% of Cr0.2-0.6% of Mo0.2 and less than or equal to 0.25% of C, and the rolling process comprises rolling control, rolling temperature control, deformation process control and cooling control;
the process flow of the steel bar rolling is as follows: heating, rough rolling, fine rolling and cooling.
Preferably, the nickel-chromium-molybdenum steel is fused into a billet by a steel mill, and then enters a steel mill to be heated by induction heating;
the rolling temperature control structure comprises a temperature controller and a temperature sensor and is used for controlling the internal temperature of the induction heating furnace.
Preferably, the billet is heated and then roughly rolled, the billet is repeatedly rolled by a rough rolling mill to form a billet plate, and the rolled billet is softened after being heated and continuously rolled;
and (3) performing finish rolling on the rough-rolled blank to form a linear shape, and performing cooling and shaping by water cooling.
Preferably, the temperature control of the induction heating furnace is divided into three stages;
the preheating temperature of the first stage is controlled to be 600-700 ℃, the temperature of the heating stage is controlled to be 1180-1200 ℃, and the temperature of the soaking stage is controlled to be 1180-1200 ℃;
the preheating temperature in the second stage is controlled to be 630-750 ℃, the temperature in the heating stage is controlled to be 1200-1230 ℃, and the temperature in the soaking stage is controlled to be 1180-1200 ℃;
the preheating temperature of the third stage is controlled to be 650-800 ℃, the temperature of the heating stage is controlled to be 1220-1250 ℃, and the temperature of the soaking stage is controlled to be 1180-1230 ℃;
the temperature is raised 25 minutes before the start of rolling, an air butterfly valve keeps 1/5 degree of opening, and the temperature difference of the billet is controlled not to exceed 50 ℃.
Preferably, the cooling process after the steel bar is rolled adopts a mode of combining water cooling and natural cooling;
the rolled high-temperature steel bar moves on the surface of a heat dissipation roller way, a heat dissipation fan is arranged above the roller way, the heat exchange between the surface of the steel bar and the air is increased, and natural air cooling is carried out;
the end of the heat dissipation roller way is provided with an immersion type cooling water tank, the reinforcing steel bar enters the water tank to be cooled by water after passing through the heat dissipation roller way, and the reinforcing steel bar at 800 ℃ is cooled to 100-150 ℃.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the heating and cooling processes in the rolling process are accurately controlled, and the accurate control of key production process indexes is ensured through a unique controlled cooling process scheme, so that the process performances of the rolled TLB-500 low-temperature-resistant steel bar, such as normal-temperature yield strength, maximum total elongation, bending and the like, all meet the normal-temperature requirements of the low-temperature steel bar for the liquefied natural gas storage tank in the industry standard YB/T4641-plus-material 2018.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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", and the like indicate orientations or positional relationships only for convenience in describing the present invention and simplifying the 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 low temperature resistant steel bar rolling process scheme, the low temperature resistant steel bar adopts nickel chromium molybdenum steel, the nickel chromium molybdenum steel composition includes Ni0.7-3.0%, Cr0.4-2.0%, Mo0.2-0.6%, C is less than or equal to 0.25%, the rolling process is divided into rolling control, rolling temperature control, deformation process control and cooling control;
the process flow of the steel bar rolling is as follows: heating, rough rolling, fine rolling and cooling.
Fusing nickel-chromium-molybdenum steel into billets through a steel mill, entering a steel mill, and heating through induction heating;
the rolling temperature control structure comprises a temperature controller and a temperature sensor and controls the internal temperature of the induction heating furnace.
Heating a steel billet, performing rough rolling, repeatedly rolling the steel billet by a rough rolling mill to form a billet plate, heating the rolled billet, softening the rolled billet, and continuously and uninterruptedly rolling;
and (3) performing finish rolling on the rough-rolled blank to form a linear shape, and performing cooling and shaping by water cooling.
The temperature control of the induction heating furnace is divided into three stages;
the preheating temperature of the first stage is controlled to be 600-700 ℃, the temperature of the heating stage is controlled to be 1180-1200 ℃, and the temperature of the soaking stage is controlled to be 1180-1200 ℃;
the preheating temperature in the second stage is controlled to be 630-750 ℃, the temperature in the heating stage is controlled to be 1200-1230 ℃, and the temperature in the soaking stage is controlled to be 1180-1200 ℃;
the preheating temperature of the third stage is controlled to be 650-800 ℃, the temperature of the heating stage is controlled to be 1220-1250 ℃, and the temperature of the soaking stage is controlled to be 1180-1230 ℃;
the temperature is raised 25 minutes before the start of rolling, an air butterfly valve keeps 1/5 degree of opening, and the temperature difference of the billet is controlled not to exceed 50 ℃.
The cooling process after the steel bar rolling adopts a mode of combining water cooling and natural cooling;
the rolled high-temperature steel bar moves on the surface of a heat dissipation roller way, a heat dissipation fan is arranged above the roller way, the heat exchange between the surface of the steel bar and the air is increased, and natural air cooling is carried out;
the end of the heat dissipation roller way is provided with an immersion type cooling water tank, the reinforcing steel bar enters the water tank to be cooled by water after passing through the heat dissipation roller way, and the reinforcing steel bar at 800 ℃ is cooled to 100-150 ℃.
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.
Claims (5)
1. A low-temperature-resistant steel bar rolling process scheme is characterized in that: the low-temperature resistant steel bar is made of nickel-chromium-molybdenum steel, the components of the nickel-chromium-molybdenum steel comprise 0.7-3.0% of Ni0.4-2.0% of Cr0.2-0.6% of Mo0.2 and less than or equal to 0.25% of C, and the rolling process comprises rolling control, rolling temperature control, deformation process control and cooling control;
the process flow of the steel bar rolling is as follows: heating, rough rolling, fine rolling and cooling.
2. The process scheme for rolling the low-temperature-resistant steel bars according to claim 1 is characterized in that: the nickel-chromium-molybdenum steel is fused into a steel billet by a steel mill, enters a steel rolling mill and is heated by induction heating;
the rolling temperature control structure comprises a temperature controller and a temperature sensor and is used for controlling the internal temperature of the induction heating furnace.
3. The process scheme for rolling the low-temperature-resistant steel bars according to claim 1 is characterized in that: the billet is heated and then roughly rolled, the billet is repeatedly rolled by a rough rolling mill to be rolled into a billet plate, and the rolled billet is softened after being heated and continuously rolled;
and (3) performing finish rolling on the rough-rolled blank to form a linear shape, and performing cooling and shaping by water cooling.
4. The process scheme for rolling the low-temperature-resistant steel bars according to claim 1 is characterized in that: the temperature control of the induction heating furnace is divided into three stages;
the preheating temperature of the first stage is controlled to be 600-700 ℃, the temperature of the heating stage is controlled to be 1180-1200 ℃, and the temperature of the soaking stage is controlled to be 1180-1200 ℃;
the preheating temperature in the second stage is controlled to be 630-750 ℃, the temperature in the heating stage is controlled to be 1200-1230 ℃, and the temperature in the soaking stage is controlled to be 1180-1200 ℃;
the preheating temperature of the third stage is controlled to be 650-800 ℃, the temperature of the heating stage is controlled to be 1220-1250 ℃, and the temperature of the soaking stage is controlled to be 1180-1230 ℃;
the temperature is raised 25 minutes before the start of rolling, an air butterfly valve keeps 1/5 degree of opening, and the temperature difference of the billet is controlled not to exceed 50 ℃.
5. The process scheme for rolling the low-temperature-resistant steel bars according to claim 1 is characterized in that: the cooling process after the steel bar is rolled adopts a mode of combining water cooling and natural cooling;
the rolled high-temperature steel bar moves on the surface of a heat dissipation roller way, a heat dissipation fan is arranged above the roller way, the heat exchange between the surface of the steel bar and the air is increased, and natural air cooling is carried out;
the end of the heat dissipation roller way is provided with an immersion type cooling water tank, the reinforcing steel bar enters the water tank to be cooled by water after passing through the heat dissipation roller way, and the reinforcing steel bar at 800 ℃ is cooled to 100-150 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011636271.8A CN112828033A (en) | 2020-12-31 | 2020-12-31 | Low-temperature-resistant steel bar rolling process scheme |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011636271.8A CN112828033A (en) | 2020-12-31 | 2020-12-31 | Low-temperature-resistant steel bar rolling process scheme |
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| Publication Number | Publication Date |
|---|---|
| CN112828033A true CN112828033A (en) | 2021-05-25 |
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| CN202011636271.8A Pending CN112828033A (en) | 2020-12-31 | 2020-12-31 | Low-temperature-resistant steel bar rolling process scheme |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103952625A (en) * | 2014-05-14 | 2014-07-30 | 马鞍山市安工大工业技术研究院有限公司 | Controlled-rolling and controlled-cooling low-temperature steel bar and preparation method thereof |
| CN105665442A (en) * | 2016-01-14 | 2016-06-15 | 中冶赛迪工程技术股份有限公司 | Coil production method and production line thereof |
| CN106319180A (en) * | 2016-08-31 | 2017-01-11 | 云南德胜钢铁有限公司 | Machining technology of anti-knock reinforcing steel bars |
| KR101804941B1 (en) * | 2016-11-11 | 2017-12-05 | 동국제강주식회사 | Rebar having excellent yield ratio and elongation and manufacturing method thereof |
| CN207615375U (en) * | 2017-11-01 | 2018-07-17 | 浙江万泰特钢有限公司 | A kind of screw-thread steel production equipment based on cooling controlling and rolling controlling process |
| CN111069282A (en) * | 2019-12-23 | 2020-04-28 | 盐城市联鑫钢铁有限公司 | High-precision multi-segmentation hot-rolled steel bar grading and controlled cooling process method |
-
2020
- 2020-12-31 CN CN202011636271.8A patent/CN112828033A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103952625A (en) * | 2014-05-14 | 2014-07-30 | 马鞍山市安工大工业技术研究院有限公司 | Controlled-rolling and controlled-cooling low-temperature steel bar and preparation method thereof |
| CN105665442A (en) * | 2016-01-14 | 2016-06-15 | 中冶赛迪工程技术股份有限公司 | Coil production method and production line thereof |
| CN106319180A (en) * | 2016-08-31 | 2017-01-11 | 云南德胜钢铁有限公司 | Machining technology of anti-knock reinforcing steel bars |
| KR101804941B1 (en) * | 2016-11-11 | 2017-12-05 | 동국제강주식회사 | Rebar having excellent yield ratio and elongation and manufacturing method thereof |
| CN207615375U (en) * | 2017-11-01 | 2018-07-17 | 浙江万泰特钢有限公司 | A kind of screw-thread steel production equipment based on cooling controlling and rolling controlling process |
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| Title |
|---|
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