CN111100977A - Production method of hot-rolled high-carbon steel - Google Patents

Production method of hot-rolled high-carbon steel Download PDF

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Publication number
CN111100977A
CN111100977A CN201911311641.8A CN201911311641A CN111100977A CN 111100977 A CN111100977 A CN 111100977A CN 201911311641 A CN201911311641 A CN 201911311641A CN 111100977 A CN111100977 A CN 111100977A
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carbon steel
equal
less
hot
rolling
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CN201911311641.8A
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Chinese (zh)
Inventor
薛启河
王宝华
陈国涛
韩宇
张明博
于静
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HBIS Co Ltd Chengde Branch
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HBIS Co Ltd Chengde Branch
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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
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • B21B1/46—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 metal immediately subsequent to continuous casting
    • B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • 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
    • 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
    • B21B45/004—Heating the product
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • 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
    • 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/06—Thermomechanical rolling
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a production method of hot-rolled high-carbon steel. The high-carbon steel comprises the following chemical components in percentage by weight: c: 0.47-0.55%, Si is less than or equal to 0.40%, Mn: 0.80-1.0%, P is less than or equal to 0.025%, S is less than or equal to 0.015%, N is less than or equal to 0.006%, and the balance of Fe and inevitable impurity elements. Through reasonable heating, rolling and curling procedures, the high-carbon steel has fine pearlite structure, low decarburized layer thickness and good cold processing performance, can realize annealing-free treatment, reduces the processing cost and has better economic benefit.

Description

Production method of hot-rolled high-carbon steel
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a production method of hot-rolled high-carbon steel.
Background
The high-carbon steel has good strength, toughness, hardness, wear resistance and other properties, is mainly used for manufacturing various tools, measuring tools and high-strength steel for building braces, and when the high-carbon steel is used for manufacturing the measuring tools, the product has strict requirements on thickness precision and thickness, and the thinnest thickness reaches about 0.01mm, so the high-carbon steel is realized by cold rolling.
Cold rolling is the secondary reprocessing of hot rolled substrates to achieve better thickness and flatness. When the high-carbon steel is cold-rolled, the hot-rolled substrate has high properties such as strength, hardness and the like, and the cold-rolling force is high, so that the cold-rolled thin product is difficult to realize. Therefore, in order to obtain thin products through the cold rolling process, annealing treatment needs to be performed on high-carbon steel materials to eliminate material stress, reduce the strength of the high-carbon steel materials, improve the elongation, eliminate the defects of cracks and the like in the cold rolling process and improve the yield of the cold-rolled products.
The invention can realize fine ferrite grains in the high-carbon steel through a reasonable production process, further obtain a smaller lamellar pearlite structure from the hot-rolled base material, has better cold processing performance, can realize annealing-free treatment, greatly reduces the processing cost of a cold rolling plant, and has better economic benefit.
Disclosure of Invention
The invention provides a production method of hot-rolled high-carbon steel, which is matched with a reasonable production process, and the obtained high-carbon steel has fine pearlite structure and low decarburized layer thickness.
In order to solve the technical problems, the technical scheme adopted by the application is as follows:
a production method of hot-rolled high-carbon steel comprises the working procedures of vanadium extraction by a converter, smelting by the converter, LF refining, slab continuous casting, slab heating, high-pressure water descaling, controlled rolling, laminar cooling and coiling; the controlled rolling procedure comprises rough rolling and finish rolling, and the outlet temperature of the rough rolling procedure is 1020-1050 ℃; and (4) the outlet temperature of the finish rolling process is 840-880 ℃, and air cooling is carried out after rolling.
In the slab heating procedure, the slab is heated to 1180-1210 ℃ in a hot charging mode, and the heating time is less than or equal to 140 min.
The coiling temperature of the coiling procedure is 680-720 ℃, the coiling lower line enters a slow cooling pit for slow cooling, and the slow cooling time is more than or equal to 48 h.
The high-carbon steel comprises the following chemical components in percentage by weight: c: 0.47-0.55%, Si is less than or equal to 0.40%, Mn: 0.80-1.0 percent of Fe, less than or equal to 0.025 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.20 percent of Cr, less than or equal to 0.30 percent of Ni, less than or equal to 0.30 percent of Cu, less than or equal to 0.006 percent of N, and the balance of Fe and inevitable impurity elements.
The high-carbon steel has the thickness of 3.5-6.0 mm and the width of 1000-1500 mm.
The high-carbon steel structure is pearlite and ferrite, wherein the ferrite accounts for less than or equal to 10%, and the pearlite inter-lamellar spacing is less than or equal to 50 mu m; the tensile strength is more than or equal to 750MPa, the yield strength is more than or equal to 400MPa, the hardness HB is less than or equal to 130, and the elongation is more than or equal to 18 percent; d is less than or equal to 1 percent of decarburized layer, wherein D is the thickness of the high-carbon steel.
The invention controls the thickness of the high-carbon steel decarburized layer and the initial austenite grains by controlling elements such as carbon, silicon, manganese and the like and matching with a low-temperature quick-firing heating system. The heating temperature in the heating process is controlled to be 1180-1210 ℃, the finish rolling outlet temperature is controlled to be 840-880 ℃, the phase change rolling of a single-phase austenite region can be ensured, and a pearlite colony structure with smaller pearlite lamellar spacing is formed by adopting an air cooling process. And after the annealing of the annealing pit, the stress of the product is released, the toughness and the ductility of the product are improved, and the strength and the hardness are reduced. The obtained hot-rolled high-carbon steel has good cold processing performance, can realize annealing-free treatment, reduces the processing cost and has better economic benefit.
The high-carbon steel structure obtained by the invention is pearlite and ferrite, wherein the ferrite accounts for less than or equal to 10%, and the pearlite inter-lamellar spacing is less than or equal to 50 mu m; the tensile strength is more than or equal to 750MPa, the yield strength is more than or equal to 400MPa, the hardness HB is less than or equal to 130, and the elongation is more than or equal to 18 percent; the decarburized layer is less than or equal to 1 percent of the thickness of the high-carbon steel.
Drawings
FIG. 1 is a metallographic structure of high carbon steel according to example 1 of the present invention;
FIG. 2 is a metallographic structure of high carbon steel according to example 2 of the present invention;
FIG. 3 is a metallographic structure of high carbon steel according to example 3 of the present invention;
FIG. 4 is a metallographic structure of high carbon steel according to example 4 of the present invention;
FIG. 5 is a metallographic structure of high carbon steel according to example 5 of the present invention;
FIG. 6 is a metallographic structure of high carbon steel according to example 6 of the present invention;
FIG. 7 is a metallographic structure of high carbon steel according to example 7 of the present invention;
FIG. 8 is a metallographic structure of high carbon steel according to example 8 of the present invention;
FIG. 9 is a metallographic structure of high carbon steel according to example 9 of the present invention;
FIG. 10 is a metallographic structure chart of high carbon steel according to example 10 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
(1) The high-carbon steel comprises the following chemical components in percentage by weight: c: 0.47-0.55%, Si is less than or equal to 0.40%, Mn: 0.80-1.0 percent of Fe, less than or equal to 0.025 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.20 percent of Cr, less than or equal to 0.30 percent of Ni, less than or equal to 0.30 percent of Cu, less than or equal to 0.006 percent of N, and the balance of Fe and inevitable impurity elements.
The chemical compositions and weight percentages of the hot rolled high carbon steel of examples 1-10 are shown in Table 1.
(2) The production method of the hot-rolled high-carbon steel comprises the working procedures of vanadium extraction by a converter, smelting by the converter, LF refining, slab continuous casting, slab heating, high-pressure water descaling, controlled rolling, laminar cooling and coiling;
in the slab heating procedure, the slab is hot-charged and heated to 1180-1210 ℃ for less than or equal to 140 min;
the controlled rolling procedure comprises rough rolling and finish rolling, and the outlet temperature of the rough rolling procedure is 1020-1050 ℃; the outlet temperature of the finish rolling process is 840-880 ℃, and air cooling is carried out after rolling;
the coiling temperature in the coiling process is 680-720 ℃, the coiling lower line enters a slow cooling pit for slow cooling, and the slow cooling time is more than or equal to 48 h.
Examples 1-10 control parameters for the hot rolled high carbon steel manufacturing process are shown in table 2.
(3) The thickness of the high-carbon steel obtained by the method is 3.5-6.0 mm, and the width of the high-carbon steel is 1000-1500 mm; the high-carbon steel structure is pearlite and ferrite, wherein the ferrite accounts for less than or equal to 10%, and the pearlite inter-lamellar spacing is less than or equal to 50 mu m; the tensile strength is more than or equal to 750MPa, the yield strength is more than or equal to 400MPa, the hardness HB is less than or equal to 130, and the elongation is more than or equal to 18 percent; d is less than or equal to 1 percent of decarburized layer, wherein D is the thickness of the high-carbon steel.
The specifications and performance test data for hot rolled high carbon steel of examples 1-10 are shown in Table 3.
The metallographic structure of the hot rolled high carbon steel according to the present invention is shown in FIGS. 1 to 10, and it can be seen that the metallographic structure of the hot rolled high carbon steel according to the present invention is pearlite and ferrite.
TABLE 1 examples 1-10 Hot rolled high carbon steel chemical compositions and weight percent (%)
Figure DEST_PATH_IMAGE002
The balance in table 1 is Fe and inevitable impurities.
TABLE 2 control parameters of the production process of hot-rolled high-carbon steel of examples 1 to 10
Figure DEST_PATH_IMAGE004
TABLE 3 specification and Performance test data for hot rolled high carbon steels of examples 1-10
Figure DEST_PATH_IMAGE006
In table 3, P represents pearlite and F represents ferrite.

Claims (6)

1. A production method of hot-rolled high-carbon steel is characterized by comprising the working procedures of vanadium extraction by a converter, smelting by the converter, LF refining, slab continuous casting, slab heating, high-pressure water descaling, controlled rolling, laminar cooling and coiling; the controlled rolling procedure comprises rough rolling and finish rolling, and the outlet temperature of the rough rolling procedure is 1020-1050 ℃; and (4) the outlet temperature of the finish rolling process is 840-880 ℃, and air cooling is carried out after rolling.
2. The method for producing hot-rolled high-carbon steel according to claim 1, wherein the slab heating step is performed by hot charging and heating the slab to 1180 to 1210 ℃ for 140min or less.
3. The production method of the hot-rolled high-carbon steel according to claim 2, wherein the coiling temperature in the coiling process is 680-720 ℃, the coiling lower line enters a slow cooling pit for slow cooling, and the slow cooling time is not less than 48 h.
4. The method for producing hot-rolled high-carbon steel according to claim 3, wherein the high-carbon steel comprises the following chemical components in percentage by weight: c: 0.47-0.55%, Si is less than or equal to 0.40%, Mn: 0.80-1.0%, P is less than or equal to 0.025%, S is less than or equal to 0.015%, N is less than or equal to 0.006%, and the balance of Fe and inevitable impurity elements.
5. The method for producing a hot-rolled high-carbon steel according to claim 4, wherein the high-carbon steel has a thickness of 3.5 to 6.0mm and a width of 1000 to 1500 mm.
6. The production method of a hot-rolled high carbon steel according to any one of claims 1 to 5, characterized in that the high carbon steel structure is pearlite and ferrite, wherein a ferrite proportion is 10% or less, and a pearlite interlamellar spacing is 50 μm or less; the tensile strength is more than or equal to 750MPa, the yield strength is more than or equal to 400MPa, the hardness HB is less than or equal to 130, and the elongation is more than or equal to 18 percent; d is less than or equal to 1 percent of decarburized layer, wherein D is the thickness of the high-carbon steel.
CN201911311641.8A 2019-12-18 2019-12-18 Production method of hot-rolled high-carbon steel Pending CN111100977A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113106320A (en) * 2021-03-08 2021-07-13 河钢股份有限公司承德分公司 Method for producing medium-high carbon steel 65Mn by alloying molten iron after vanadium extraction
CN114807555A (en) * 2022-04-19 2022-07-29 安阳钢铁集团有限责任公司 Production method of high-carbon high-silicon spring steel hot continuous rolling steel strip
CN115233084A (en) * 2021-04-23 2022-10-25 日照东昌铸业股份有限公司 High-strength nodular cast iron and preparation method thereof
CN116121657A (en) * 2022-11-25 2023-05-16 重庆钢铁股份有限公司 50-excellent carbon steel strip with excellent tissue uniformity and production method thereof

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CN106566989A (en) * 2016-11-01 2017-04-19 河钢股份有限公司承德分公司 Hot rolling wide strip steel for vanadium-containing tool and production method for hot rolling wide strip steel
CN108004477A (en) * 2017-12-04 2018-05-08 河钢股份有限公司承德分公司 A kind of atmospheric corrosion resistant hot-rolled steel strip and its production method
CN109355557A (en) * 2018-10-31 2019-02-19 河钢股份有限公司承德分公司 One kind containing the high-strength automobile reaming steel hot-rolled coil of vanadium and its production method
CN109457186A (en) * 2018-12-11 2019-03-12 唐山中厚板材有限公司 A kind of concrete mould bases steel plate and its production method
CN109536830A (en) * 2018-11-26 2019-03-29 河钢股份有限公司承德分公司 550MPa grades of titaniferous thin gauge weathering steels of yield strength and its production method
CN109735776A (en) * 2019-02-14 2019-05-10 唐山中厚板材有限公司 A kind of 500HB grade wear-resisting steel plate and its production method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106566989A (en) * 2016-11-01 2017-04-19 河钢股份有限公司承德分公司 Hot rolling wide strip steel for vanadium-containing tool and production method for hot rolling wide strip steel
CN108004477A (en) * 2017-12-04 2018-05-08 河钢股份有限公司承德分公司 A kind of atmospheric corrosion resistant hot-rolled steel strip and its production method
CN109355557A (en) * 2018-10-31 2019-02-19 河钢股份有限公司承德分公司 One kind containing the high-strength automobile reaming steel hot-rolled coil of vanadium and its production method
CN109536830A (en) * 2018-11-26 2019-03-29 河钢股份有限公司承德分公司 550MPa grades of titaniferous thin gauge weathering steels of yield strength and its production method
CN109457186A (en) * 2018-12-11 2019-03-12 唐山中厚板材有限公司 A kind of concrete mould bases steel plate and its production method
CN109735776A (en) * 2019-02-14 2019-05-10 唐山中厚板材有限公司 A kind of 500HB grade wear-resisting steel plate and its production method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113106320A (en) * 2021-03-08 2021-07-13 河钢股份有限公司承德分公司 Method for producing medium-high carbon steel 65Mn by alloying molten iron after vanadium extraction
CN113106320B (en) * 2021-03-08 2022-06-14 河钢股份有限公司承德分公司 Method for producing medium-high carbon steel 65Mn by alloying molten iron after vanadium extraction
CN115233084A (en) * 2021-04-23 2022-10-25 日照东昌铸业股份有限公司 High-strength nodular cast iron and preparation method thereof
CN114807555A (en) * 2022-04-19 2022-07-29 安阳钢铁集团有限责任公司 Production method of high-carbon high-silicon spring steel hot continuous rolling steel strip
CN116121657A (en) * 2022-11-25 2023-05-16 重庆钢铁股份有限公司 50-excellent carbon steel strip with excellent tissue uniformity and production method thereof

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