CN111235480A - Preparation method of high-strength steel coil - Google Patents
Preparation method of high-strength steel coil Download PDFInfo
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- CN111235480A CN111235480A CN202010185342.0A CN202010185342A CN111235480A CN 111235480 A CN111235480 A CN 111235480A CN 202010185342 A CN202010185342 A CN 202010185342A CN 111235480 A CN111235480 A CN 111235480A
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Child & Adolescent Psychology (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention belongs to the field of steel production, and particularly relates to a preparation method of a high-strength steel coil. The technical scheme of the invention is as follows: a preparation method of a high-strength steel coil comprises the following steps: 1) manufacturing a high-strength steel continuous casting billet; 2) manufacturing a high-strength steel hot-rolled steel coil; 3) and (3) self-tempering the high-strength steel hot-rolled steel coil. According to the preparation method of the high-strength steel coil, the prepared high-strength steel coil has small internal stress and good plate shape when the decoiler unit is opened.
Description
Technical Field
The invention belongs to the field of steel production, and particularly relates to a preparation method of a high-strength steel coil.
Background
The high-strength steel is applied to industries such as automobiles, buildings, bridges and the like in a large amount due to extremely high strength, and the high-strength product replaces a low-strength product, so that the purposes of reducing thickness and weight, saving energy, improving efficiency and the like under the condition that the structure meets the use requirement are realized. The high-strength steel has high production difficulty, needs a large amount of alloy elements and complex production technology, and also needs various comprehensive index guarantee measures.
The high-strength steel hot-rolled steel coil is easy to crack due to excessive internal stress and is the fatal weakness of the high-strength steel. The excessive internal stress can cause the high-strength steel to tear the steel plate after cutting, so that the steel plate cannot be used. With the continuous maturity of production technology, the key to the application and popularization of the high-strength steel hot-rolled steel coil is to solve the problem of excessive internal stress.
Due to the strength requirement of the high-strength steel coil, a large amount of alloy needs to be added and the high-strength steel coil needs to be coiled at low temperature, so that the problem of poor plate shape after laminar cooling is caused, and a great part of the problem of poor plate shape is caused by overlarge internal stress.
Disclosure of Invention
The invention provides a preparation method of a high-strength steel coil, and the prepared high-strength steel coil has small internal stress and good plate shape when a decoiler unit is opened.
The technical scheme of the invention is as follows:
a preparation method of a high-strength steel coil comprises the following steps:
1) manufacturing a high-strength steel continuous casting billet; the high-strength steel continuous casting billet comprises the following materials in percentage by weight: c: 0.04-0.08%, Si: less than or equal to 0.60 percent, Mn: 1.40-1.80%, P is less than or equal to 0.025%, S is less than or equal to 0.010%, Als is less than or equal to 0.070%, Nb: 0.05-0.08%, Ti: 0.08 to 0.12 percent; the balance of iron and inevitable impurities;
2) manufacturing a high-strength steel hot-rolled steel coil; the high-strength steel continuous casting blank is used as a raw material to be produced on a hot continuous rolling unit, the high-strength steel continuous casting blank is placed in a stepping heating furnace to be heated, and the temperature is kept for 40-80 min at 1220-1270 ℃; after the high-strength steel continuous casting billet is discharged, high-pressure water descaling is carried out, and the high-strength steel continuous casting billet enters a roughing mill for rolling; the temperature of the intermediate blank after rough rolling is less than or equal to 1030 ℃, and then the intermediate blank enters a finishing mill group for rolling, wherein the finishing temperature is 800-830 ℃; after rolling, quickly carrying out laminar cooling, and curling into a high-strength steel hot-rolled steel coil after cooling to 300-450 ℃;
3) self-tempering the high-strength steel hot-rolled steel coil; the high-strength steel hot-rolled steel coils are collectively stacked in a closed steel coil warehouse, and the steel coil warehouse is a warehouse with an enclosing wall and a ceiling; the high-strength steel hot-rolled steel coils are intensively stacked at the center, the high-temperature steel coils surround the periphery and the upper part of the high-strength steel hot-rolled steel coils, the high-temperature steel coils are steel coils with the curling temperature of 550-650 ℃ and are just produced, a cold stacking atmosphere is formed, the high-strength steel hot-rolled steel coils are slowly cooled, and the high-strength steel hot-rolled steel coils achieve the purposes of stress relief annealing and tempering to eliminate residual stress; and the high-strength steel hot-rolled steel coil is placed for more than 3 days and can be moved to obtain the high-strength steel coil after being cooled to below 40 ℃.
The invention has the beneficial effects that: the high-strength steel coil prepared by the preparation method has small internal stress and good plate shape when the decoiler unit is decoiled. By changing the cooling mode of the steel coil after hot rolling, the original free storage cooling mode is changed into the pile cooling and surrounding cooling mode, the temperature of the steel coil is slowly cooled, self tempering is carried out by utilizing the self heat of the steel coil, the internal stress of high-strength steel is eliminated, and the steel coil with good plate shape is obtained. The cost of the heat treatment process is saved, the waste heat of the steel coil is reasonably utilized, extra stations and processes are not needed, and the occupied area and the capital are reduced.
Detailed Description
A preparation method of a high-strength steel coil comprises the following steps:
the self-tempering hot-rolled pickled high-strength steel CP800 comprises the following materials in percentage by weight: c: 0.05%, Si: 0.50%, Mn: 1.70%, P0.018%, S0.002%, Als 0.03%, Nb: 0.05%, Ti: 0.10 percent; the balance being iron and unavoidable impurities.
Producing a high-strength steel continuous casting billet on a hot continuous rolling unit, heating the continuous casting billet in a stepping heating furnace, and keeping the temperature at 1260 ℃ for 56 min; after the casting blank is discharged from the furnace, high-pressure water descaling is carried out, and then the casting blank is rolled in a roughing mill; after rough rolling, the temperature of the intermediate blank is 1010 ℃, and then the intermediate blank enters a finishing mill set for rolling, wherein the finishing temperature is 810 ℃; after rolling, laminar cooling is rapidly carried out, and after cooling to 400 ℃, the steel is curled into a high-strength steel hot rolled steel coil.
The high-strength steel hot-rolled steel coils are stacked in a centralized manner in a closed steel coil warehouse, the steel coil warehouse is a warehouse with a wall and a ceiling, the high-strength steel hot-rolled steel coils are stacked in a centralized manner at the center, the high-temperature steel coils are surrounded on the periphery and the upper part of the high-strength steel hot-rolled steel coils, the high-temperature steel coils are steel coils which are coiled at the temperature of 550 ℃ and 650 ℃ and are just produced, a cold stacking atmosphere is formed, the high-strength steel hot-rolled steel coils are placed for 4 days, and all the steel coils start to move after being cooled to 30 ℃.
Claims (1)
1. A preparation method of a high-strength steel coil is characterized by comprising the following steps:
1) manufacturing a high-strength steel continuous casting billet; the high-strength steel continuous casting billet comprises the following materials in percentage by weight: c: 0.04-0.08%, Si: less than or equal to 0.60 percent, Mn: 1.40-1.80%, P is less than or equal to 0.025%, S is less than or equal to 0.010%, Als is less than or equal to 0.070%, Nb: 0.05-0.08%, Ti: 0.08 to 0.12 percent; the balance of iron and inevitable impurities;
2) manufacturing a high-strength steel hot-rolled steel coil; the high-strength steel continuous casting blank is used as a raw material to be produced on a hot continuous rolling unit, the high-strength steel continuous casting blank is placed in a stepping heating furnace to be heated, and the temperature is kept for 40-80 min at 1220-1270 ℃; after the high-strength steel continuous casting billet is discharged, high-pressure water descaling is carried out, and the high-strength steel continuous casting billet enters a roughing mill for rolling; the temperature of the intermediate blank after rough rolling is less than or equal to 1030 ℃, and then the intermediate blank enters a finishing mill group for rolling, wherein the finishing temperature is 800-830 ℃; after rolling, quickly carrying out laminar cooling, and curling into a high-strength steel hot-rolled steel coil after cooling to 300-450 ℃;
3) self-tempering the high-strength steel hot-rolled steel coil; the high-strength steel hot-rolled steel coils are collectively stacked in a closed steel coil warehouse, and the steel coil warehouse is a warehouse with an enclosing wall and a ceiling; the high-strength steel hot-rolled steel coils are intensively stacked at the center, the high-temperature steel coils surround the periphery and the upper part of the high-strength steel hot-rolled steel coils, the high-temperature steel coils are steel coils with the curling temperature of 550-650 ℃ and are just produced, a cold stacking atmosphere is formed, the high-strength steel hot-rolled steel coils are slowly cooled, and the high-strength steel hot-rolled steel coils achieve the purposes of stress relief annealing and tempering to eliminate residual stress; and the high-strength steel hot-rolled steel coil is placed for more than 3 days and can be moved to obtain the high-strength steel coil after being cooled to below 40 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010185342.0A CN111235480A (en) | 2020-03-17 | 2020-03-17 | Preparation method of high-strength steel coil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010185342.0A CN111235480A (en) | 2020-03-17 | 2020-03-17 | Preparation method of high-strength steel coil |
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| CN111235480A true CN111235480A (en) | 2020-06-05 |
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| CN202010185342.0A Pending CN111235480A (en) | 2020-03-17 | 2020-03-17 | Preparation method of high-strength steel coil |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112522488A (en) * | 2020-11-18 | 2021-03-19 | 浙江屹立金属材料有限公司 | Manufacturing process of steel coil |
| CN114164331A (en) * | 2021-11-24 | 2022-03-11 | 本钢板材股份有限公司 | Method for eliminating internal stress of high-strength steel |
| CN114683011A (en) * | 2020-12-29 | 2022-07-01 | 无锡苏嘉法斯特汽车零配件有限公司 | Method for manufacturing automobile transmission shaft tube |
Citations (10)
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| CN101899616A (en) * | 2010-07-22 | 2010-12-01 | 河北省首钢迁安钢铁有限责任公司 | Steel for 600MPa-grade high-strength engineering machines and production method thereof |
| CN102127691A (en) * | 2011-02-21 | 2011-07-20 | 宁波钢铁有限公司 | Method for producing hot rolled steel coil |
| CN102212748A (en) * | 2011-02-21 | 2011-10-12 | 宁波钢铁有限公司 | Method for producing hot-rolled steel coils |
| CN102500618A (en) * | 2011-10-28 | 2012-06-20 | 内蒙古包钢钢联股份有限公司 | Production method for large disc coil of sucker rod |
| CN104056863A (en) * | 2013-09-06 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-rolled steel plate and preparation method thereof |
| CN105734403A (en) * | 2016-03-04 | 2016-07-06 | 河北钢铁股份有限公司承德分公司 | Hot-rolled coil for saw blade steel and production method of hot-rolled coil |
| CN107663611A (en) * | 2016-07-29 | 2018-02-06 | 本钢板材股份有限公司 | A kind of production method of inexpensive 490MPa levels hot rolling acid-cleaning plate |
| CN108728742A (en) * | 2018-06-01 | 2018-11-02 | 钢铁研究总院 | A kind of manufacturing method of antidetonation fire resisting corrosion-resisting steel and medium plate and sheet metal |
| CN109821903A (en) * | 2019-02-20 | 2019-05-31 | 攀钢集团攀枝花钢铁研究院有限公司 | The control method of high-strength steel hot rolled plate shape |
| CN110066966A (en) * | 2019-05-22 | 2019-07-30 | 武汉钢铁有限公司 | A kind of low internal stress titaniferous high-strength steel and production method |
-
2020
- 2020-03-17 CN CN202010185342.0A patent/CN111235480A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101899616A (en) * | 2010-07-22 | 2010-12-01 | 河北省首钢迁安钢铁有限责任公司 | Steel for 600MPa-grade high-strength engineering machines and production method thereof |
| CN102127691A (en) * | 2011-02-21 | 2011-07-20 | 宁波钢铁有限公司 | Method for producing hot rolled steel coil |
| CN102212748A (en) * | 2011-02-21 | 2011-10-12 | 宁波钢铁有限公司 | Method for producing hot-rolled steel coils |
| CN102500618A (en) * | 2011-10-28 | 2012-06-20 | 内蒙古包钢钢联股份有限公司 | Production method for large disc coil of sucker rod |
| CN104056863A (en) * | 2013-09-06 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot-rolled steel plate and preparation method thereof |
| CN105734403A (en) * | 2016-03-04 | 2016-07-06 | 河北钢铁股份有限公司承德分公司 | Hot-rolled coil for saw blade steel and production method of hot-rolled coil |
| CN107663611A (en) * | 2016-07-29 | 2018-02-06 | 本钢板材股份有限公司 | A kind of production method of inexpensive 490MPa levels hot rolling acid-cleaning plate |
| CN108728742A (en) * | 2018-06-01 | 2018-11-02 | 钢铁研究总院 | A kind of manufacturing method of antidetonation fire resisting corrosion-resisting steel and medium plate and sheet metal |
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| CN110066966A (en) * | 2019-05-22 | 2019-07-30 | 武汉钢铁有限公司 | A kind of low internal stress titaniferous high-strength steel and production method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112522488A (en) * | 2020-11-18 | 2021-03-19 | 浙江屹立金属材料有限公司 | Manufacturing process of steel coil |
| CN114683011A (en) * | 2020-12-29 | 2022-07-01 | 无锡苏嘉法斯特汽车零配件有限公司 | Method for manufacturing automobile transmission shaft tube |
| CN114164331A (en) * | 2021-11-24 | 2022-03-11 | 本钢板材股份有限公司 | Method for eliminating internal stress of high-strength steel |
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Application publication date: 20200605 |
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