CN111545569B - Rolling process of low-manganese low-alloy steel plate - Google Patents
Rolling process of low-manganese low-alloy steel plate Download PDFInfo
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- CN111545569B CN111545569B CN202010429193.8A CN202010429193A CN111545569B CN 111545569 B CN111545569 B CN 111545569B CN 202010429193 A CN202010429193 A CN 202010429193A CN 111545569 B CN111545569 B CN 111545569B
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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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
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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
- B21B45/02—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 for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
-
- 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
- B21B45/04—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 for de-scaling, e.g. by brushing
- B21B45/08—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 for de-scaling, e.g. by brushing hydraulically
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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
-
- 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
-
- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B2001/225—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 plates, strips, bands or sheets of indefinite length by hot-rolling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a rolling process of a low-manganese low-alloy steel plate, which comprises the following process steps: blanking → heating of steel billet → rough dephosphorization → first rolling → spray cooling → second rolling. The rolling process of the low-manganese low-alloy steel plate can be used for manufacturing the high-performance low-manganese low-alloy steel plate, and the tensile strength of the obtained low-manganese low-alloy steel plate can reach 470-630 Mpa, which is equivalent to that of a normal low-alloy Q355B.
Description
Technical Field
The invention relates to the field of steel plate rolling processes, in particular to a rolling process of a low-manganese low-alloy steel plate.
Background
The conventional steel plate rolling process comprises the following steps: blanking → heating of billet → rough dephosphorization → rolling; the low-manganese low-alloy steel plate rolled by the conventional steel plate rolling process has low tensile strength and cannot meet the requirements of customers; in order to improve the strength and the performance of the steel plate, it is decided to try to develop a rolling production process of the low-manganese low-alloy steel plate so that the tensile strength of the low-manganese low-alloy steel plate can reach the tensile strength of the normal low-alloy Q355B.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a rolling process of a low-manganese low-alloy steel plate capable of preparing a high-performance low-manganese low-alloy steel plate.
In order to solve the problems, the technical scheme adopted by the invention is as follows: the rolling process of the low-manganese low-alloy steel plate comprises the following process steps: blanking → heating of steel billet → rough dephosphorization → first rolling → spray cooling → second rolling, which is characterized in that:
(1) in the blanking process: the steel material for blanking comprises the following chemical components in percentage by mass: c: less than 0.15 percent; si: less than 0.3 percent; mn: less than 0.9 percent; p: less than 0.03 percent; s: less than 0.03 percent;
(2) in the billet heating procedure: heating the billet obtained by blanking by adopting a heating furnace with the length of 30m, wherein the heating furnace is evenly divided into a preheating section, a heating section and a heating section from front to back in sequence, the furnace temperature of the preheating section is 750 ℃, the furnace temperature of the heating section is 1050 ℃, the furnace temperature of the heating section is 1120 ℃, the furnace temperature of the heating section is 1220 ℃, and the billet is arranged along the length direction of the heating furnace in a propping manner in sequence, so that when the inlet of the heating furnace enters one unheated billet, one heated billet at the outlet of the heating furnace can be ejected out of the heating furnace;
(3) in the rough descaling procedure: conveying the discharged steel billet by a conveying roller way to pass through a descaling box in a forward direction for the second time, enabling the steel billet to retreat to pass through the descaling box by the conveying roller way after the steel billet passes through the descaling box in the forward direction, then enabling the steel billet to pass through the descaling box in the forward direction again by the forward conveying, arranging a spray head which is arranged opposite to the conveying direction of the steel billet and can spray water at an angle of 40-50 degrees in an inclined manner towards the upper surface of the steel billet in the descaling box, wherein the water pressure sprayed by the spray head is 110kg, and when the steel billet passes through the descaling box in the forward direction, the spray head can spray pressurized water towards the upper surface of the steel billet to remove furnace-grown oxide scale on the upper surface of the steel billet;
(4) in the first rolling procedure: the method comprises the following steps that a billet is conveyed backwards through a conveying roller way and enters a rolling mill for rolling, the rolling reduction of the rolling mill each time is 15mm until the billet is rolled to be 60 +/-2 mm in thickness, fine descaling is carried out for four times in the rolling process, so that oxide skin on the surface of a steel plate obtained through rolling is removed, fine descaling is carried out by spraying water at an angle of 40-50 degrees to the upper surface of the steel plate through a spray head of the rolling mill, and the water pressure sprayed by the spray head is 110 kg;
(5) in the spraying and cooling process: conveying the steel plate obtained by the first rolling to the position below a spraying frame by a conveying roller way, and spraying and cooling for 35-45 seconds to reduce the temperature of the steel plate to 800 +/-10 ℃;
(6) in the second rolling procedure: and (3) the cooled steel plate is conveyed by the conveying roller way to enter the rolling mill again for rolling, the rolling reduction of the rolling mill is 8-10 mm each time until the steel plate is rolled to the required thickness, and the final rolling temperature is 750 ℃.
Further, the rolling process of the low-manganese low-alloy steel plate comprises the following steps: the rolling mill is a four high reversing type rolling mill.
Further, the rolling process of the low-manganese low-alloy steel plate comprises the following steps: both sides all are provided with a spray rack around the rolling mill, can be carried to spray and cool down under the spray rack behind the rolling mill after preceding billet is accomplished the first rolling, when preceding billet sprays and cools down, the back billet of accomplishing the coarse descaling can be carried into the rolling mill and carries out the first rolling, the back billet is accomplished after the first rolling and is carried to spray and cool down under the spray rack in rolling mill the place ahead, when the back billet sprays and cools down, the preceding billet of accomplishing the cooling can be carried into in the rolling mill and carry out the secondary rolling, preceding billet can be carried backward after accomplishing the secondary rolling, the back billet of accomplishing the cooling can be carried into the rolling mill and carry out the secondary rolling after that, the back billet can be carried backward after accomplishing the secondary rolling.
Further, the rolling process of the low-manganese low-alloy steel plate comprises the following steps: the burners on the two sides of the heating furnace heat alternately, so that the steel temperature is ensured, and the steel billet cannot be over-burnt.
The invention has the advantages that: the low-manganese low-alloy steel plate with high performance can be manufactured by adopting the rolling process of the low-manganese low-alloy steel plate, and the tensile strength of the low-manganese low-alloy steel plate can reach 470-630 Mpa, which is equivalent to that of normal low-alloy Q355B.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The rolling process of the low-manganese low-alloy steel plate comprises the following process steps: blanking → heating of steel billet → rough dephosphorization → first rolling → spray cooling → second rolling;
(1) in the blanking process: the specification of the billet obtained by blanking is as follows: 220mm × 1200mm × 1660 mm; the steel material for blanking comprises the following chemical components in percentage by mass: c: less than 0.15 percent; si: less than 0.3 percent; mn: less than 0.9 percent; p: less than 0.03 percent; s: less than 0.03 percent;
(2) in the billet heating procedure: the method comprises the following steps of heating a billet obtained by blanking by adopting a heating furnace with the length of 30m, wherein during heating, burners on two sides in the heating furnace are alternately heated, so that the steel temperature is ensured, and the billet cannot be over-heated; a billet is produced by the heating furnace every 3.5 minutes; the billet can be heated better and more conveniently by adopting the heating mode, so that the internal and external temperature areas of the billet are consistent, and energy can be better saved;
(3) in the rough descaling procedure: conveying the discharged steel billet by a conveying roller way to pass through a descaling box in a forward direction for the second time, enabling the steel billet to retreat to pass through the descaling box by the conveying roller way after the steel billet passes through the descaling box in the forward direction, then enabling the steel billet to pass through the descaling box in the forward direction again by the forward conveying, arranging a spray head which is arranged opposite to the conveying direction of the steel billet and can spray water at an angle of 40-50 degrees in an inclined manner towards the upper surface of the steel billet in the descaling box, wherein the water pressure sprayed by the spray head is 110kg, and when the steel billet passes through the descaling box in the forward direction, the spray head can spray pressurized water towards the upper surface of the steel billet to remove furnace-grown oxide scale on the upper surface of the steel billet; the furnace-generated oxide scale on the upper surface of the billet can be better removed completely through the working procedures;
(4) in the first rolling procedure: the method comprises the following steps that a billet is conveyed backwards through a conveying roller way and enters a rolling mill for rolling, in the embodiment, the rolling mill is a four-roller reversible type rolling mill, the rolling reduction of the rolling mill each time is 15mm until the billet is rolled to the thickness of 60 +/-2 mm, fine descaling is carried out for four times in the rolling process, so that oxide skins on the surface of a steel plate obtained through rolling are removed, the fine descaling is carried out by spraying water at an angle of 40-50 degrees obliquely to the upper surface of the steel plate through a spray head of the rolling mill, and the water pressure sprayed by the spray head is 110 kg;
(5) in the spraying and cooling process: conveying the steel plate obtained by the first rolling to the position below a spraying frame by a conveying roller way, and spraying and cooling for 35-45 seconds to reduce the temperature of the steel plate to 800 +/-10 ℃;
(6) in the second rolling procedure: and (3) conveying the cooled steel plate by a conveying roller way, and then, rolling the steel plate in the rolling mill again, wherein the rolling reduction of the rolling mill is 8-10 mm each time until the thickness of the steel plate is rolled to 10mm, the width of the steel plate is 2200mm, and the final rolling temperature is 750 ℃.
In this embodiment, both sides all are provided with a spray rack around the rolling mill, can be carried to spray rack behind the rolling mill and spray the cooling after preceding billet finishes rolling for the first time, when preceding billet sprays the cooling, the back billet of accomplishing the coarse descaling can be carried into the rolling mill and carries out rolling for the first time, the back billet is carried to spray under the spray rack in rolling mill the place ahead after accomplishing rolling for the first time and is cooled, when the back billet sprays the cooling, the preceding billet of accomplishing the cooling can be carried into the rolling mill and carry out rolling for the second time, preceding billet can be carried backward after accomplishing rolling for the second time, the back billet of accomplishing the cooling can be carried into the rolling mill and carry out rolling for the second time after that, the back billet can be carried backward after accomplishing rolling for the second time. Thus, the production efficiency can be greatly improved and the energy can be saved after rolling.
The two-time rolling is used for better improving the performance and the strength of the plate.
Claims (1)
1. The rolling process of the low-manganese low-alloy steel plate comprises the following process steps: blanking → heating of steel billet → rough dephosphorization → first rolling → spray cooling → second rolling, which is characterized in that:
(1) in the blanking process: the steel material for blanking comprises the following chemical components in percentage by mass: c: less than 0.15 percent; si: less than 0.3 percent; mn: less than 0.9 percent; p: less than 0.03 percent; s: less than 0.03 percent;
(2) in the billet heating procedure: the method comprises the following steps of heating a billet obtained by blanking by adopting a heating furnace with the length of 30m, alternately heating by using burners on two sides in the heating furnace, ensuring the steel temperature and preventing the billet from being over-burnt, evenly dividing the heating furnace into a preheating section, a heating section and a heating section from front to back in sequence, wherein the furnace temperature of the preheating section is 750 ℃, the furnace temperature of the heating section is 1050 ℃, the furnace temperature of the heating section is 1120 ℃, the furnace temperature of the heating section is 1220 ℃, the billet is arranged along the length direction of the heating furnace in a propping manner in sequence, and one heated billet at the outlet of the heating furnace can be ejected out of the heating furnace when the inlet of the heating furnace enters one unheated billet;
(3) in the rough descaling procedure: conveying the discharged steel billet by a conveying roller way to pass through a descaling box in a forward direction for the second time, enabling the steel billet to retreat to pass through the descaling box by the conveying roller way after the steel billet passes through the descaling box in the forward direction, then enabling the steel billet to pass through the descaling box in the forward direction again by the forward conveying, arranging a spray head which is arranged opposite to the conveying direction of the steel billet and can spray water at an angle of 40-50 degrees in an inclined manner towards the upper surface of the steel billet in the descaling box, wherein the water pressure sprayed by the spray head is 110kg, and when the steel billet passes through the descaling box in the forward direction, the spray head can spray pressurized water towards the upper surface of the steel billet to remove furnace-grown oxide scale on the upper surface of the steel billet;
(4) in the first rolling procedure: the method comprises the following steps that a billet is conveyed backwards through a conveying roller way and enters a rolling mill for rolling, the rolling mill is a four-roller reversing type rolling mill, the rolling reduction of the rolling mill each time is 15mm until the billet is rolled to be 60 +/-2 mm in thickness, fine descaling is carried out for four times in the rolling process, so that oxide skins on the surface of a steel plate obtained through rolling are removed, water is sprayed on the upper surface of the steel plate in an inclined mode by 40-50 degrees through a spray head of the rolling mill, and the water pressure sprayed by the spray head is 110 kg;
(5) in the spraying and cooling process: conveying the steel plate obtained by the first rolling to the position below a spraying frame by a conveying roller way, and spraying and cooling for 35-45 seconds to reduce the temperature of the steel plate to 800 +/-10 ℃;
(6) in the second rolling procedure: the cooled steel plate is conveyed by a conveying roller way to enter the rolling mill again for rolling, the rolling reduction of the rolling mill is 8-10 mm each time until the steel plate is rolled to the required thickness, and the final rolling temperature is 750 ℃; in addition, both the front side and the rear side of the rolling mill are provided with a spraying frame, the front billet can be conveyed to the position below the spraying frame behind the rolling mill to be sprayed and cooled after the first rolling of the front billet is finished, the rear billet which is subjected to rough descaling can be conveyed into the rolling mill to be subjected to the first rolling when the front billet is sprayed and cooled, the rear billet is conveyed to the position below the spraying frame in front of the rolling mill to be sprayed and cooled after the first rolling of the rear billet is finished, the front billet which is subjected to cooling can be conveyed into the rolling mill to be subjected to the second rolling when the rear billet is sprayed and cooled, the front billet can be conveyed backwards after the second rolling of the front billet is finished, the rear billet which is subjected to cooling can be conveyed into the rolling mill to be subjected to the second rolling, and the rear billet can be conveyed backwards after the second rolling of the rear billet is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010429193.8A CN111545569B (en) | 2020-05-20 | 2020-05-20 | Rolling process of low-manganese low-alloy steel plate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010429193.8A CN111545569B (en) | 2020-05-20 | 2020-05-20 | Rolling process of low-manganese low-alloy steel plate |
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| CN111545569A CN111545569A (en) | 2020-08-18 |
| CN111545569B true CN111545569B (en) | 2021-10-26 |
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| CN1586752A (en) * | 2004-08-03 | 2005-03-02 | 唐山钢铁股份有限公司 | Method for producing thin plate blank continuous casting and continuous rolling low carbon steel ferrite |
| CN101008043B (en) * | 2006-01-27 | 2010-05-12 | 宝山钢铁股份有限公司 | Process for producing ferritic stainless steel |
| CN102989785B (en) * | 2012-12-17 | 2015-01-14 | 济钢集团有限公司 | Process for controlling surface piebaldness of steel plates |
| CN103173598B (en) * | 2013-03-11 | 2014-10-15 | 河北钢铁股份有限公司唐山分公司 | Annealing-free medium-high carbon steel plate making technology |
| CN103433298B (en) * | 2013-08-15 | 2016-01-27 | 柳州钢铁股份有限公司 | Ultra-thin gauge rolling container plate End-Management method |
| CN104525560B (en) * | 2014-12-29 | 2017-05-31 | 天津钢铁集团有限公司 | Effective control method of the 30mm cut deal pitted skins of straight carbon steel/Nb bearing steel 20 |
| CN109865742B (en) * | 2019-02-27 | 2020-03-24 | 江苏省沙钢钢铁研究院有限公司 | Production method of thin hot-rolled pickled automobile plate with tensile strength of 440MPa |
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