CN114904914A - Rolling method of duplex stainless steel wire rod - Google Patents
Rolling method of duplex stainless steel wire rod Download PDFInfo
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- CN114904914A CN114904914A CN202210687145.8A CN202210687145A CN114904914A CN 114904914 A CN114904914 A CN 114904914A CN 202210687145 A CN202210687145 A CN 202210687145A CN 114904914 A CN114904914 A CN 114904914A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 133
- 229910001039 duplex stainless steel Inorganic materials 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims abstract description 68
- 238000009749 continuous casting Methods 0.000 claims abstract description 41
- 238000001816 cooling Methods 0.000 claims abstract description 32
- 230000006698 induction Effects 0.000 claims abstract description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 6
- 238000002791 soaking Methods 0.000 claims description 14
- 238000009987 spinning Methods 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 7
- 238000005336 cracking Methods 0.000 abstract description 19
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 238000001556 precipitation Methods 0.000 abstract description 8
- 238000002360 preparation method Methods 0.000 abstract description 8
- 238000004512 die casting Methods 0.000 abstract description 5
- 238000005242 forging Methods 0.000 abstract description 4
- 238000005498 polishing Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 description 16
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 230000010485 coping Effects 0.000 description 7
- 229910001566 austenite Inorganic materials 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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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
- B21B1/46—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- 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
-
- 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
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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
- B21B45/04—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
- B21B45/06—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 of strip material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/10—Compression, e.g. longitudinal compression
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
Abstract
The invention belongs to the field of rolling of stainless steel wire rods, and particularly relates to a rolling method of a duplex stainless steel wire rod. According to the rolling method disclosed by the invention, the diameter range of the obtained duplex stainless steel wire rod is phi 5.5-15 mm, and the rolling method comprises continuous casting billet preparation, continuous casting billet heating, continuous casting billet cogging, intermediate billet heating, high-speed wire rolling and cooling, and further comprises intermediate billet polishing. The invention adopts the continuous casting billet to roll the duplex stainless steel wire rod after cogging, replaces the original process of rolling after die casting ingot forging, can effectively improve the production efficiency and improve the rolling yield. The invention optimizes the cogging heating temperature and the cogging process reduction, optimizes the intermediate billet heating temperature and the high-speed wire rolling process temperature, is matched with an induction heating device for on-line temperature rise in the rolling process, adopts a Stramer line to realize rapid cooling after rolling, solves the problems of cracking of the duplex stainless steel in rolling and warping and cracking of the surface of a finished product, has good surface quality of a rolled wire rod, uniform tissue and no precipitation, and has high comprehensive yield.
Description
Technical Field
The invention relates to the field of rolling of stainless steel wire rods, in particular to a rolling method of a duplex stainless steel wire rod.
Background
The Duplex Stainless Steel (DSS) contains austenite and ferrite in equal volume fraction, has excellent toughness and weldability of the austenite stainless steel and high strength and chloride stress corrosion resistance of the ferrite stainless steel, and is widely applied to industries of petrochemical industry, seawater desalination, paper making and the like. But the uneven stress and strain distribution of austenite and ferrite during deformation leads to easy surface crack generation in the hot rolling process of the duplex stainless steel, the production difficulty is higher, only a few steel mills can produce the duplex stainless steel at home at present, the production method mainly adopts the modes of die casting blank forging, coping and high-speed wire rolling, the die casting blank is adopted, the production period is longer, and the comprehensive yield is lower.
At present, the production method of the duplex stainless steel wire rod is less researched in China, most patents disclose the components and the optimized design process of the duplex stainless steel, but the production method is less published, most publications disclose the preparation method of the duplex stainless steel plate or the pipe, and the detailed description of the preparation method of the duplex stainless steel wire rod is not found.
Patent No. CN 113652602a discloses "alloy material for high performance duplex stainless steel wire rope and its preparation method", and the invention discloses the whole route from duplex stainless steel billet to duplex stainless steel wire, but the process of rolling billet into wire rod is not detailed. Patent No. CN 110475895a discloses "duplex stainless steel and its manufacturing method", and the present invention discloses a method for improving corrosion resistance of duplex steel, but how to perform hot working is not described. Patent No. CN 111344426a discloses duplex stainless steel and a manufacturing method thereof, and the invention discloses duplex stainless steel, which describes the heating temperature of rolling, but others are not detailed, and the temperature is suitable for rolled plates and not suitable for wire rod production.
In the prior art, firstly, continuous casting billets are directly rolled, although the method has the advantages of high energy efficiency and low loss, the method has high rolling cracking and scrap rate, the comprehensive yield is less than 50%, and steel piling accidents are easily caused; secondly, a mode of die casting blank forging, coping and high-speed wire rolling is adopted, the method is the existing mainstream production mode, but the method has longer production period and lower comprehensive yield, and the comprehensive yield is less than 80%. Therefore, the current production method of the duplex stainless steel wire rod is still one of the difficulties studied vigorously in the field.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a rolling method of duplex stainless steel, which realizes the purpose of rolling a duplex stainless steel wire rod by adopting a continuous casting billet, effectively improves the production efficiency and improves the comprehensive yield; meanwhile, the problems of cracking of the duplex stainless steel in rolling and warping and cracking of the surface of a finished product are solved, and the surface quality of the wire rod is improved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a rolling method of a duplex stainless steel wire rod comprises the following steps:
(1) heating a continuous casting square billet of 200 x 200 to 260 x 260 (unit mm);
(2) cogging the heated continuous casting square billet to an intermediate billet of 150 multiplied by 150 to 160 multiplied by 160 (unit mm);
(3) and heating the intermediate billet, performing high-line rolling, and rapidly cooling to not higher than 250 ℃ after rolling to obtain the dual-phase stainless steel wire rod.
Preferably, the surface of the billet of the continuous casting billet in the step (1) is required to be flat without visible defects.
Preferably, the heating in the step (1) is to heat the continuous casting billet to 1230 +/-10 ℃; more preferably, the blank shape of the continuous casting billet is larger, and four sections of heating are adopted for uniform heating: a preheating section: the temperature is 600 plus or minus 20 ℃, and the time is 60 plus or minus 20 min; heating for a first period: the temperature is 900 plus or minus 20 ℃, and the time is 40 plus or minus 5 min; and (3) heating for a second stage: the temperature is 1000 +/-15 ℃, and the time is 40 +/-5 min; a soaking section: the temperature is 1230 +/-10 ℃ and the time is 30 +/-5 min. By adopting the technical scheme, the continuous casting square billet is uniformly preheated, and the subsequent cogging step is further facilitated.
Preferably, in the step (2), the continuous casting billet is cogging by using an 850 cogging mill.
Preferably, in the step (2), the whole cogging temperature is more than or equal to 980 ℃, and the cogging reduction per pass is less than or equal to 10%. By adopting the technical scheme, the cracking phenomenon of the blank caused by too large rolling compression ratio can be further avoided.
Preferably, the step (2) further includes an intermediate billet grinding step of grinding the intermediate billet after cogging to remove surface scale and surface defects caused by cogging. Through carrying out the coping to the intermediate blank, can further reduce the fracture risk of rolling process on the basis of guaranteeing the wire rod performance, further improve the comprehensive lumber recovery of wire rod.
Preferably, in the step (3), the intermediate blank is heated to 1230 +/-10 ℃; the more preferable intermediate billet is smaller, and three sections of heating and preheating sections are adopted: the temperature is 800 plus or minus 20 ℃, and the time is 60 plus or minus 20 min; a heating section: the temperature is 1000 +/-20 ℃, and the time is 40 +/-5 min; a soaking section: the temperature is 1230 +/-10 ℃ and the time is 30 +/-5 min.
Preferably, the high-speed wire rolling in the step (3) adopts a high-speed wire rolling unit for rolling, and comprises 6-pass rough rolling, 12-pass intermediate rolling, 6-pass pre-finish rolling, 10-pass finish rolling and a wire laying machine, wherein the rolling reduction of each pass is less than or equal to 18%.
Preferably, in the step (3), the initial rolling temperature is 1160-1200 ℃, the finish rolling temperature is 980-1030 ℃, the spinning temperature is 1000-1050 ℃, and the maximum rolling speed is less than or equal to 70 m/s.
Preferably, in the high-speed rolling process in the step (3), after rough rolling, an induction heating step is further arranged to heat the rolled piece on line, and the set temperature is 1050-1080 ℃; more preferably by being equipped with an induction heating device. Further ensuring the temperature of the rolled piece in the rolling process.
Preferably, the cooling speed of the rapid cooling in the step (3) is more than or equal to 10 ℃/s, more preferably, the wind speed of a stelmor wind cooling line is maximized after spinning, and the heat-insulating cover is completely opened to realize rapid cooling.
Preferably, the coil is collected after the temperature in the step (3) is cooled to be less than or equal to 250 ℃, and the coil is naturally cooled to the room temperature after being collected.
Preferably, the specification of the duplex stainless steel wire rod is phi 5.5-15 mm.
Preferably, the rolling method of the duplex stainless steel wire rod specifically comprises the following steps:
(1) preparing a continuous casting blank: the continuous casting square billet with the thickness of 200 multiplied by 200-260 multiplied by 260 (unit mm) is adopted, the surface of the billet is required to be smooth, and no visible defects exist.
(2) Heating a continuous casting blank: because of the continuous casting billet type is great, for making the even that is heated, adopt four sections heating, preheating section: the temperature is 600 plus or minus 20 ℃, and the time is 60 plus or minus 20 min; heating for a first period: the temperature is 900 plus or minus 20 ℃, and the time is 40 plus or minus 5 min; and (3) heating for a second stage: the temperature is 1000 +/-15 ℃, and the time is 40 +/-5 min; a soaking section: the temperature is 1230 +/-10 ℃ and the time is 30 +/-5 min.
(3) Cogging of the continuous casting billet: and (3) cogging the continuous casting billet by adopting a 850 cogging mill to obtain an intermediate billet of 150 multiplied by 150 to 160 multiplied by 160 (unit mm).
(4) Intermediate blank grinding: and carrying out coping treatment on the intermediate blank after cogging to remove surface oxide skin and surface defects caused by cogging.
(5) Heating the intermediate blank: the intermediate billet is smaller, three sections of heating and preheating sections are adopted: the temperature is 800 plus or minus 20 ℃, and the time is 60 plus or minus 20 min; a heating section: the temperature is 1000 +/-20 ℃, and the time is 40 +/-5 min; a soaking section: the temperature is 1230 +/-10 ℃ and the time is 30 +/-5 min.
(6) High-speed wire rolling: the high-speed wire rod rolling unit is adopted and comprises 6-pass rough rolling, 12-pass intermediate rolling, 6-pass pre-finish rolling, 10-pass finish rolling and a wire laying machine, wherein the rolling reduction of each pass is less than or equal to 18%.
(7) And (3) controlling cooling: after spinning, the wind speed of the stelmor wind cooling line is maximized, the heat-insulating cover is completely opened, rapid cooling is realized, the cooling speed is more than or equal to 10 ℃/S, the temperature is cooled to be less than or equal to 250 ℃, then coiling is carried out, and the coil is naturally cooled to the room temperature after coiling.
According to the invention, the continuous casting billet is designed to be subjected to primary cogging, and then subjected to high-speed wire rolling after being cogging into an intermediate billet with a smaller size, and meanwhile, the cogging intermediate billet is subjected to polishing treatment. The problem that the core of the continuous casting blank is loose and the hole is shrunk can be solved by cogging, the internal grain structure of the blank is recrystallized after being crushed, the bonding force between crystal boundaries is improved, a small amount of defects caused by cogging are removed by polishing treatment on the surface after cogging, then high-speed wire rolling is carried out, the process temperature and the pressing down are controlled, and the problem of cracking and scrapping caused by direct high-speed wire rolling of the continuous casting blank can be effectively solved.
Compared with the prior art, the invention has the beneficial effects that:
1. the duplex stainless steel wire rod is produced by rolling the continuous casting billet, the original rolling method after die casting blank forging is replaced, the comprehensive yield and the production efficiency are effectively improved, and the comprehensive yield is more than or equal to 87 percent.
2. The continuous casting billet is adopted for cogging, four-section heating is adopted for heating, so that the temperature of the continuous casting billet is uniformly heated, the reduction of each pass of cogging is controlled to be less than or equal to 10 percent, and the cracking of the billet caused by too large rolling compression ratio can be avoided.
3. The purpose of secondary rolling after the continuous casting billet is cogging is that the problems of loose and shrinkage cavity of the continuous casting billet core can be solved, the internal grain structure of the billet is crushed and then recrystallized, the bonding force between grain boundaries is improved, and then the intermediate billet is subjected to high-speed wire rolling after being polished, so that the cracking probability during high-speed wire rolling can be further effectively reduced.
4. During high-speed wire rolling, the intermediate billet is heated in three sections, so that the heating is uniform, the rolling reduction of each pass is controlled to be less than or equal to 18 percent, and the rolled piece is prevented from cracking caused by too large deformation.
5. When high-speed wire rolling is carried out, the rough rolling and the induction heating equipment are matched to heat the rolled piece on line, and the temperature sensitivity of the duplex stainless steel is high, the temperature range with good thermoplasticity is narrow, so that the rolled piece can be kept in the temperature range with good thermoplasticity all the time in an on-line heating mode, and rolling cracking caused by temperature reduction is further avoided.
6. After spinning, rapid cooling is adopted, the cooling speed is more than or equal to 10 ℃/S, and the steel wire is cooled to the temperature of less than or equal to 250 ℃ and then coiled, so that the precipitation temperature range of sigma phase is effectively avoided, and the tissue is uniform without precipitation.
Drawings
Fig. 1 is a macroscopic picture of the surface of a duplex stainless steel wire rod of example 1;
FIG. 2 is a metallographic structure photograph of a duplex stainless steel wire rod according to example 1;
FIG. 3 is a macroscopic picture of the surface of a duplex stainless steel wire rod of example 4;
fig. 4 is a macroscopic picture of the surface of a duplex stainless steel wire rod of comparative example 1 (produced by the prior art).
Detailed Description
The invention is explained in more detail below by way of examples and with reference to the accompanying drawings. These examples are only illustrative of some of the preferred embodiments of the present invention and do not limit the scope of the present invention in any way.
Example 1:
the rolled product of this example is a duplex stainless steel wire rod ER2209 with a specification phi of 5.5 mm. The preparation method comprises the following specific steps:
(1) preparing a blank: adopting 200 multiplied by 200 (unit mm) ER2209 square billets smelted from Qingshan steel, and the components are as follows (mass percent): 0.016 percent of C, 0.43 percent of Si, 1.30 percent of Mn, 0.018 percent of P, 0.0015 percent of S, 8.67 percent of Ni, 23.32 percent of Cr, 0.09 percent of N, 3.20 percent of Mo, and the balance of iron and inevitable impurities, and the blank has a flat surface and no visible defects.
(2) Heating a continuous casting blank: a preheating section: the temperature is 600 plus or minus 20 ℃, and the time is 68 min; heating for a first period: the temperature is 900 plus or minus 20 ℃, and the time is 42 min; and (3) heating for a second stage: the temperature is 1000 +/-15 ℃, and the time is 44 min; a soaking section: the temperature is 1230 +/-10 ℃ and the time is 31 min.
(3) Cogging of the continuous casting billet: the continuous casting blank is cogging by adopting a 850 cogging mill to an intermediate blank of 155 multiplied by 155 (unit mm), the lowest temperature of the whole cogging process is 990 ℃, 5 times are carried out totally, and the maximum cogging reduction of each time is 9%.
(4) Intermediate blank grinding: and carrying out coping treatment on the intermediate blank after cogging to remove surface oxide skin and surface defects caused by cogging.
(5) Heating the intermediate blank: three-stage heating and preheating are adopted: the temperature is 800 +/-20 ℃, and the time is 66 min; a heating section: the temperature is 1000 +/-20 ℃, and the time is 42 min; a soaking section: the temperature is 1230 +/-10 ℃ and the time is 34 min.
(6) High-speed wire rolling: the method adopts a high-speed wire rod rolling unit which comprises 6-pass rough rolling, 12-pass intermediate rolling, 6-pass pre-finish rolling, 10-pass finish rolling and a wire laying machine, wherein the maximum rolling reduction of each pass is 17%, the initial rolling temperature is 1189 ℃, the finish rolling temperature is 1012 ℃, the wire laying temperature is 1022 ℃, the rolling speed is 69m/s, induction heating is arranged after rough rolling, and the set temperature of induction heating equipment is 1060 ℃.
(7) And (3) controlling cooling: after spinning, the wind speed of a stelmor wind cooling line is maximized, the heat-insulating cover is completely opened, rapid cooling is realized, the cooling speed is 12 ℃/S, the temperature is cooled to 230 ℃, coiling is carried out, and the coiling is naturally cooled to the room temperature.
The surface macroscopic picture of the duplex stainless steel wire rod of the embodiment is shown in fig. 1, the surface is excellent, the defects of cracking, warping, cracking and the like are avoided, the structure is uniform, the precipitation is avoided, the comprehensive yield is 95.5%, and the mechanical property is excellent.
Example 2:
the duplex stainless steel wire rod S32205 with the specification phi of 8.5mm is rolled in the embodiment. The preparation method comprises the following specific steps:
(1) preparing a blank: a220 multiplied by 220 (unit mm) S32205 square billet smelted from Qingshan steel is adopted, and the components are as follows (in percentage by mass): 0.019% of C, 0.36% of Si, 1.33% of Mn, 0.020% of P, 0.0010% of S, 4.59% of Ni, 22.49% of Cr, 0.160% of N and 3.05% of Mo, and the blank is flat in surface and free of visible defects.
(2) Heating a continuous casting blank: a preheating section: the temperature is 600 plus or minus 20 ℃, and the time is 70 min; heating for a first period: the temperature is 900 plus or minus 20 ℃, and the time is 45 min; and (3) heating for a second stage: the temperature is 1000 +/-15 ℃, and the time is 40 min; a soaking section: the temperature is 1230 +/-10 ℃ and the time is 28 min.
(3) Cogging of the continuous casting billet: and (3) cogging the continuous casting billet by adopting a 850 cogging mill to obtain an intermediate billet of 158 multiplied by 158 (unit mm), wherein the lowest temperature of the whole cogging process is 980 ℃, 6 times are totally carried out, and the maximum reduction of cogging in each time is 8%.
(4) Intermediate blank grinding: and carrying out coping treatment on the intermediate blank after cogging to remove surface oxide skin and surface defects caused by cogging.
(5) Heating the intermediate blank: three-stage heating and preheating are adopted: the temperature is 800 +/-20 ℃, and the time is 72 min; a heating section: the temperature is 1000 +/-20 ℃, and the time is 41 min; a soaking section: the temperature is 1230 +/-10 ℃ and the time is 28 min.
(6) High-speed wire rolling: the method adopts a high-speed wire rod rolling unit which comprises 6-pass rough rolling, 12-pass intermediate rolling, 6-pass pre-finish rolling, 8-pass finish rolling and a wire laying machine, wherein the maximum rolling reduction of each pass is 15%, the initial rolling temperature is 1180 ℃, the finish rolling temperature is 990 ℃, the wire laying temperature is 1010 ℃, the rolling speed is 55m/s, and the set temperature of induction heating equipment is 1065 ℃.
(7) And (3) controlling cooling: after spinning, the wind speed of a stelmor wind cooling line is maximized, the heat-insulating cover is completely opened, rapid cooling is realized, the cooling speed is 14 ℃/S, the temperature is cooled to 240 ℃, coiling is carried out, and the coiling is naturally cooled to room temperature.
The duplex stainless steel wire rod has the advantages of excellent surface, no defects of cracking, warping, cracking and the like, uniform tissue, no precipitation, 94.7 percent of comprehensive yield and excellent mechanical property.
Example 3:
the rolled product of this example is a duplex stainless steel wire rod S32750 with a specification of phi 7.0 mm. The preparation method comprises the following specific steps:
(1) preparing a blank: a260 multiplied by 260 (unit mm) S32750 square billet smelted from Qingshan steel is adopted, and the components are (by mass percent): 0.015 percent of C, 0.40 percent of Si, 0.64 percent of Mn, 0.018 percent of P, 0.001 percent of S, 6.14 percent of Ni, 25.73 percent of Cr, 0.271 percent of N and 3.48 percent of Mo, and the blank has a flat surface and no visible defects.
(2) Heating a continuous casting blank: a preheating section: the temperature is 600 plus or minus 20 ℃, and the time is 78 min; heating for a first period: the temperature is 900 plus or minus 20 ℃, and the time is 45 min; and (3) heating for a second stage: the temperature is 1000 +/-15 ℃, and the time is 35 min; a soaking section: the temperature is 1230 +/-10 ℃ and the time is 34 min.
(3) Cogging of the continuous casting billet: and (3) cogging the continuous casting billet by adopting a 850 cogging mill to obtain an intermediate billet of 160 multiplied by 160 (unit mm), wherein the lowest temperature of the whole cogging process is 990 ℃, the 8 times are totally carried out, and the maximum reduction of cogging in each time is 10%.
(4) Intermediate blank grinding: and carrying out coping treatment on the intermediate blank after cogging to remove surface oxide skin and surface defects caused by cogging.
(5) Heating the intermediate blank: three-stage heating and preheating are adopted: the temperature is 800 plus or minus 20 ℃, and the time is 78 min; a heating section: the temperature is 1000 +/-20 ℃, and the time is 45 min; a soaking section: the temperature is 1230 +/-10 ℃ and the time is 26 min.
(6) High-speed wire rolling: the method adopts a high-speed wire rod rolling unit which comprises 6-pass rough rolling, 12-pass intermediate rolling, 6-pass pre-finish rolling, 8-pass finish rolling and a wire laying machine, wherein the maximum rolling reduction of each pass is 16%, the initial rolling temperature is 1168 ℃, the finish rolling temperature is 1015 ℃, the wire laying temperature is 1038 ℃, the rolling speed is 63m/s, induction heating is carried out after rough rolling, and the set temperature of induction heating equipment is 1075 ℃.
(7) And (3) controlling cooling: after spinning, the wind speed of a stelmor wind cooling line is maximized, the heat-insulating cover is completely opened, rapid cooling is realized, the cooling speed is 13 ℃/S, the temperature is reduced to 228 ℃, coiling is carried out, and the coiling is naturally cooled to the room temperature.
The duplex stainless steel wire rod has the advantages of excellent surface, no defects of cracking, warping, cracking and the like, uniform tissue, no precipitation, 94.3 percent of comprehensive yield and excellent mechanical property.
Example 4:
the rolled product of this example is a duplex stainless steel wire rod ER2209 with a specification phi of 5.5 mm. The preparation method comprises the following specific steps:
(1) preparing a blank: adopting 200 multiplied by 200 (unit mm) ER2209 square billets smelted from Qingshan steel, and the components are as follows (mass percent): 0.018% of C, 0.46% of Si, 1.41% of Mn, 0.013% of P, 0.0016% of S, 8.55% of Ni, 23.28% of Cr, 0.11% of N and 3.18% of Mo, and the blank has a flat surface and no visible defects.
(2) Heating a continuous casting blank: a preheating section: the temperature is 600 plus or minus 20 ℃, and the time is 50 min; heating for a first period: the temperature is 900 plus or minus 20 ℃, and the time is 42 min; and (3) heating for a second stage: the temperature is 1000 +/-15 ℃, and the time is 37 min; a soaking section: the temperature is 1230 +/-10 ℃ and the time is 32 min.
(3) Cogging of the continuous casting billet: and (3) cogging the continuous casting billet by adopting a 850 cogging mill to obtain an intermediate billet of 158 multiplied by 158 (unit mm), wherein the lowest temperature of the whole cogging process is 985 ℃, the maximum reduction of each pass is 8 percent.
(4) Heating the intermediate blank: three-stage heating and preheating are adopted: the temperature is 800 plus or minus 20 ℃, and the time is 64 min; a heating section: the temperature is 1000 +/-20 ℃, and the time is 42 min; a soaking section: the temperature is 1230 +/-10 ℃ and the time is 31 min.
(5) High-speed wire rolling: the method adopts a high-speed wire rod rolling unit which comprises 6-pass rough rolling, 12-pass intermediate rolling, 6-pass pre-finish rolling, 10-pass finish rolling and a wire laying machine, wherein the maximum rolling reduction of each pass is 15%, the initial rolling temperature is 1170 ℃, the finish rolling temperature is 1003 ℃, the wire laying temperature is 1015 ℃, the rolling speed is 67m/s, induction heating is carried out after the rough rolling, and the set temperature of induction heating equipment is 1055 ℃.
(6) And (3) controlling cooling: after spinning, the wind speed of a stelmor wind cooling line is maximized, the heat-insulating cover is completely opened, rapid cooling is realized, the cooling speed is 11 ℃/S, the temperature is 235 ℃, coiling is carried out, and the coiling is naturally cooled to the room temperature.
The duplex stainless steel wire rod has the advantages of excellent surface, no defects of cracking, warping, cracking and the like, uniform tissue, no precipitation, 87.5 percent of comprehensive yield and excellent mechanical property.
TABLE 1 example yield and mechanical Properties
In summary, the duplex stainless steel wire rod prepared by the method has the advantages of excellent surface quality, uniform structure, no precipitation and good mechanical property; the rolling yield and the production efficiency are greatly improved, the comprehensive rolling yield is more than or equal to 87 percent, and the yield can be further improved to be not less than 94 percent on the premise of polishing the intermediate blank.
The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to be limiting in any way, and other variations and modifications are possible without departing from the scope of the invention as set forth in the appended claims.
Claims (10)
1. A rolling method of a duplex stainless steel wire rod is characterized by comprising the following steps:
(1) heating a continuous casting square billet with the diameter of 200mm multiplied by 200mm to 260mm multiplied by 260 mm;
(2) the heated continuous casting square billet is cogging to an intermediate billet with the diameter of 150mm multiplied by 150 mm-160 mm multiplied by 160 mm;
(3) and heating the intermediate billet, performing high-line rolling, and rapidly cooling to not higher than 250 ℃ after rolling to obtain the dual-phase stainless steel wire rod.
2. The rolling method of a duplex stainless steel wire rod according to claim 1, wherein the heating in the step (1) is four-stage heating: a preheating section: the temperature is 600 plus or minus 20 ℃, and the time is 60 plus or minus 20 min; heating for a first period: the temperature is 900 plus or minus 20 ℃, and the time is 40 plus or minus 5 min; and (3) heating for a second stage: the temperature is 1000 +/-15 ℃, and the time is 40 +/-5 min; a soaking section: the temperature is 1230 +/-10 ℃ and the time is 30 +/-5 min.
3. The rolling method of the duplex stainless steel wire rod according to claim 1, wherein in the step (2), the whole cogging temperature is more than or equal to 980 ℃, and the cogging reduction per pass is less than or equal to 10%.
4. The rolling method of duplex stainless steel wire rod according to claim 1, wherein in the step (2), an intermediate blank grinding step is further included.
5. The rolling method of a duplex stainless steel wire rod according to claim 1, wherein the intermediate billet in the step (3) is heated in three stages: the temperature is 800 plus or minus 20 ℃, and the time is 60 plus or minus 20 min; a heating section: the temperature is 1000 +/-20 ℃, and the time is 40 +/-5 min; a soaking section: the temperature is 1230 +/-10 ℃ and the time is 30 +/-5 min.
6. The rolling method of a duplex stainless steel wire rod according to claim 1, wherein the high-speed rolling in the step (3) comprises 6-pass rough rolling, 12-pass intermediate rolling, 6-pass pre-finish rolling, 10-pass finish rolling and a wire laying head.
7. The rolling method of a duplex stainless steel wire rod according to claim 6, wherein the rolling reduction per pass is 18% or less.
8. The rolling method of the duplex stainless steel wire rod according to claim 1, wherein in the step (3), the initial rolling temperature in the high-speed rolling process is 1160-1200 ℃, the finish rolling temperature is 980-1030 ℃, the spinning temperature is 1000-1050 ℃, and the rolling speed is not higher than 70 m/s.
9. The rolling method of the duplex stainless steel wire rod according to claim 1, wherein in the step (3), the process of high-speed rolling is further provided with an induction heating step after rough rolling to raise the temperature of the rolled piece on line, and the set temperature is 1050-1080 ℃.
10. The rolling method of a duplex stainless steel wire rod according to claim 1, wherein the cooling rate of the rapid cooling in the step (3) is not less than 10 ℃/s.
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| CN115725811A (en) * | 2022-12-16 | 2023-03-03 | 浙江青山钢铁有限公司 | Production method of second-generation duplex stainless steel wire |
| CN115725889A (en) * | 2022-12-16 | 2023-03-03 | 浙江青山钢铁有限公司 | Production method of high-carbon martensitic stainless steel wire rod |
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