CN110732552A - Method for heating high-strength hot-rolled steel sheet - Google Patents
Method for heating high-strength hot-rolled steel sheet Download PDFInfo
- Publication number
- CN110732552A CN110732552A CN201911011992.7A CN201911011992A CN110732552A CN 110732552 A CN110732552 A CN 110732552A CN 201911011992 A CN201911011992 A CN 201911011992A CN 110732552 A CN110732552 A CN 110732552A
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- heating
- rolled steel
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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
- B21B1/24—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 in a continuous or semi-continuous process
- B21B1/26—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 in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to a heating method of high-strength hot-rolled steel plates, belonging to the technical field of hot continuous rolled plate strip production, when the hot-rolled steel plates are produced by continuous casting, the temperature of a preheating section of a continuous casting billet is less than or equal to 1100 ℃, the temperature of a heating section is 1050-1290 ℃, the temperature of a soaking section is 1220-1260 ℃, the time of the soaking section is more than or equal to 40min, the total furnace time is 170-320 min, when the rolling heat preservation is more than or equal to 60min, the temperature of the preheating section is less than or equal to 950 ℃, the temperature of the heating section is 1050-1150 ℃, and the temperature of the soaking section is 1130-1240 ℃.
Description
Technical Field
The invention relates to a heating method of high-strength hot-rolled steel plates, belongs to the technical field of hot continuous rolling strip production, and is particularly suitable for producing high-strength steel with yield strength of more than 600 MPa.
Background
Under the conditions of increasingly deficient energy and increasingly deteriorated environment, the development of energy-saving and low-emission automobile technology is a necessary way to reduce energy consumption and environmental pollution.
Therefore, in the fields of automobiles and engineering machinery, increasing strength to reduce weight is an effective measure for reducing fuel consumption. In the prior stage, the high-strength steel is mainly precipitated and strengthened, micro-alloy element redissolution and austenite growth processes exist in the hot rolling and heating process, austenite recrystallization and deformation induced phase change precipitation processes exist in the rolling process, and austenite-ferrite phase change and interphase precipitation processes exist in the laminar cooling process, so that the mechanical property difference of various parts at the middle edge, the middle head and the tail of the product is large, and the integral mechanical property is not stable enough.
Disclosure of Invention
The invention aims to solve the technical problem that the overall mechanical property of a product can be more stable by providing the heating method of hot rolled steel plates.
In order to solve the technical problems, the invention adopts the technical scheme that: the heating method of the hot rolled steel plate comprises the steps that the temperature of a preheating section of a continuous casting blank is less than or equal to 1100 ℃, the temperature of a heating section is 1050-1290 ℃, the temperature of a soaking section is 1220-1260 ℃, the time of the soaking section is more than or equal to 40min, and the total in-furnace time is 170-320 min; when the rolling heat preservation is more than or equal to 60min, the temperature of the preheating section is less than or equal to 950 ℃, the temperature of the heating section is 1050-1150 ℃, and the temperature of the soaking section is 1130-1240 ℃.
is used to produce high-strength steel with yield strength higher than 600 MPa.
, the metallurgical structure of the steel used for production is a ferrite + pearlite dual-phase structure.
The invention has the beneficial effects that: by controlling the hot rolling heating process, the redissolution of micro-alloy elements and the size of original austenite grains are controlled, so that the stability of the strength is controlled. The ferrite and pearlite dual-phase structure high-strength steel produced by the method has stable mechanical properties of the edges, the heads, the tails and the edges of the product, and has the characteristics of simple process control, strong adaptability, short production period, low cost and the like.
Detailed Description
The invention is further illustrated with reference to the following examples.
When the invention is used for producing hot rolled steel plates by continuous casting, the temperature of a preheating section of a continuous casting billet is less than or equal to 1100 ℃, the temperature of a heating section is 1050-1290 ℃, the temperature of a soaking section is 1220-1260 ℃, the time of the soaking section is more than or equal to 40min, and the total in-furnace time is 170-320 min; when the rolling heat preservation is more than or equal to 60min, the temperature of the preheating section is less than or equal to 950 ℃, the temperature of the heating section is 1050-1150 ℃, and the temperature of the soaking section is 1130-1240 ℃. The invention controls the redissolution of micro alloy elements and the size of original austenite grains by controlling the hot rolling heating process, thereby controlling the stability of strength, and particularly having obvious effect when being used for producing high-strength steel with yield strength of more than 600MPa and a dual-phase structure of ferrite and pearlite as a metallographic structure.
Example (b):
a certain high-strength steel is a steel billet which is smelted and continuously cast by a conventional converter, and comprises the chemical components of, by weight, 0.06% of C, 0.08% of Si, 1.67% of Mn, 0.014% of P, 0.006% of S, 0.087% of Ti, and the balance of Fe and inevitable impurity elements, and the continuously cast plate blank is subjected to plate blank heating, high-pressure water descaling, rough rolling, finish rolling, laminar cooling and coiling in sequence respectively to prepare a hot continuous rolled steel plate, wherein the plate blank heating process is shown in a table 1, the mechanical properties are shown in a table 2, and the head part, the middle part and the tail part of a roll are respectively in an example 1, an example 2 and an example 3.
TABLE 1
TABLE 2
When uncontrollable factors are encountered in the production process to cause the test steel to be prolonged in the heating process (such as roller change, scrap steel and the like), a heat preservation system to be rolled is adopted, the temperature of the preheating section and the heating section is reduced, the re-dissolution process of micro-alloy elements is delayed, and the abnormal growth of original austenite grains is inhibited.
Claims (3)
1. A method for heating a hot-rolled steel sheet, characterized by comprising: the temperature of the preheating section of the continuous casting billet is less than or equal to 1100 ℃, the temperature of the heating section is 1050-1290 ℃, the temperature of the soaking section is 1220-1260 ℃, the time of the soaking section is more than or equal to 40min, and the total in-furnace time is 170-320 min; when the rolling heat preservation is more than or equal to 60min, the temperature of the preheating section is less than or equal to 950 ℃, the temperature of the heating section is 1050-1150 ℃, and the temperature of the soaking section is 1130-1240 ℃.
2. The method of heating hot-rolled steel sheet according to claim 1, characterized by: the method is used for producing high-strength steel with yield strength of more than 600 MPa.
3. The method of heating hot rolled steel sheet according to claim 1 or 2, characterized in that: the metallographic structure of the steel used for production is a ferrite + pearlite dual-phase structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911011992.7A CN110732552A (en) | 2019-10-23 | 2019-10-23 | Method for heating high-strength hot-rolled steel sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911011992.7A CN110732552A (en) | 2019-10-23 | 2019-10-23 | Method for heating high-strength hot-rolled steel sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110732552A true CN110732552A (en) | 2020-01-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911011992.7A Pending CN110732552A (en) | 2019-10-23 | 2019-10-23 | Method for heating high-strength hot-rolled steel sheet |
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| Country | Link |
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| CN (1) | CN110732552A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111638154A (en) * | 2020-06-03 | 2020-09-08 | 北京首钢股份有限公司 | Method for researching steel billet in heating section |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102719735A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Superfine crystal grain hot-rolled dual-phase steel plate for automobile and production method thereof |
| CN103643116A (en) * | 2013-11-27 | 2014-03-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Welding gas cylinder and manufacturing technology of hot rolled steel plate of welding gas bottle |
| CN103882318A (en) * | 2014-03-03 | 2014-06-25 | 南京钢铁股份有限公司 | Molybdenum-saving type multi-component microalloy shock-resistant fire-resistant steel and preparation method of steel |
| CN104141093A (en) * | 2013-05-10 | 2014-11-12 | 河北钢铁股份有限公司承德分公司 | Automobile compartment body band steel with yield strength reaching 700MPa, and rolling method thereof |
| CN105478472A (en) * | 2014-09-19 | 2016-04-13 | 鞍钢股份有限公司 | Hot rolling method of wide and thin high-strength cold-rolled substrate for automobile |
| CN107868906A (en) * | 2017-10-16 | 2018-04-03 | 首钢集团有限公司 | A kind of thin-wall high intensity square and rectangular pipe hot-strip and its manufacture method |
| CN109112433A (en) * | 2017-06-26 | 2019-01-01 | 鞍钢股份有限公司 | 590 MPa-grade cold-rolled dual-phase steel without surface stripe defects and production method thereof |
| CN109750219A (en) * | 2017-11-02 | 2019-05-14 | 上海梅山钢铁股份有限公司 | A kind of tensile strength 580Mpa grades of automobile rim hot rolling biphase plates |
-
2019
- 2019-10-23 CN CN201911011992.7A patent/CN110732552A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102719735A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Superfine crystal grain hot-rolled dual-phase steel plate for automobile and production method thereof |
| CN104141093A (en) * | 2013-05-10 | 2014-11-12 | 河北钢铁股份有限公司承德分公司 | Automobile compartment body band steel with yield strength reaching 700MPa, and rolling method thereof |
| CN103643116A (en) * | 2013-11-27 | 2014-03-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Welding gas cylinder and manufacturing technology of hot rolled steel plate of welding gas bottle |
| CN103882318A (en) * | 2014-03-03 | 2014-06-25 | 南京钢铁股份有限公司 | Molybdenum-saving type multi-component microalloy shock-resistant fire-resistant steel and preparation method of steel |
| CN105478472A (en) * | 2014-09-19 | 2016-04-13 | 鞍钢股份有限公司 | Hot rolling method of wide and thin high-strength cold-rolled substrate for automobile |
| CN109112433A (en) * | 2017-06-26 | 2019-01-01 | 鞍钢股份有限公司 | 590 MPa-grade cold-rolled dual-phase steel without surface stripe defects and production method thereof |
| CN107868906A (en) * | 2017-10-16 | 2018-04-03 | 首钢集团有限公司 | A kind of thin-wall high intensity square and rectangular pipe hot-strip and its manufacture method |
| CN109750219A (en) * | 2017-11-02 | 2019-05-14 | 上海梅山钢铁股份有限公司 | A kind of tensile strength 580Mpa grades of automobile rim hot rolling biphase plates |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111638154A (en) * | 2020-06-03 | 2020-09-08 | 北京首钢股份有限公司 | Method for researching steel billet in heating section |
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Application publication date: 20200131 |