CN113862564A - Production method of deep-drawing high-carbon steel wire rod - Google Patents
Production method of deep-drawing high-carbon steel wire rod Download PDFInfo
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- CN113862564A CN113862564A CN202111088459.8A CN202111088459A CN113862564A CN 113862564 A CN113862564 A CN 113862564A CN 202111088459 A CN202111088459 A CN 202111088459A CN 113862564 A CN113862564 A CN 113862564A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/0406—Moulds with special profile
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A production method of a deep-drawn high-carbon steel wire rod comprises the following steps of: 0.69-1.02%, Si: 0.15 to 0.35%, Mn: 0.40-0.90%, Cr is less than or equal to 0.35%, P is less than or equal to 0.025%, S is less than or equal to 0.025%, and the balance is iron and inevitable impurities. The continuous casting adopts special covering slag and a large chamfering crystallizer, high temperature is adopted for high-speed wire heating, the heat preservation time is controlled, the oxidizing atmosphere is adopted to increase the burning loss of the surface of the billet in a heating furnace, and the mesh cementite on the surface of the wire rod is less than or equal to 0.5 grade.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a control method of a net cementite on the surface of a deep-drawn high-carbon steel wire rod.
Background
The high-carbon wire rod for deep drawing is widely applied to the fields of cords, aluminum-clad steel, steel strands, bridge cables and the like, and generally requires good drawing performance. The focus of general attention is how to control the center segregation of the wire rod, and control the core network cementite of the wire rod, but neglect the control of the surface network cementite. From the experience of producing high-carbon wire rods for many years, the net cementite or carbide particles on the surface of the wire rod, which are caused by recarburization on the surface of a casting blank, can have important influence on the drawing of the high-carbon wire rod, so that the wire rod is broken in the drawing process, and huge economic loss is caused. The general method for controlling the recarburization of the casting blank is to control the recarburization source by reducing the fluctuation of the liquid level or carry out deep grinding treatment on the surface of the steel billet, but the net cementite on the surface of the wire rod cannot be eradicated, and the process cost is higher. How to economically solve the problem of the reticular cementite on the surface of the wire rod has high research value.
Disclosure of Invention
The invention aims to provide a production method of a deep-drawing high-carbon steel wire rod, which eliminates the generation of net cementite on the surface of the wire rod through the design of continuous casting covering slag, a crystallizer, heating and rolling processes.
The purpose of the invention is realized by the following technical scheme:
a production method of a deep-drawing high-carbon steel wire rod adopts the process route of converter steelmaking → LF furnace refining → continuous casting → heating → rolling → controlled cooling, wherein the chemical components of the steel comprise, by mass, C = 0.69-1.02, Si = 0.15-0.35, Mn = 0.40-0.90, Cr is less than or equal to 0.35, P is less than or equal to 0.025%, S is less than or equal to 0.025%, and the balance of iron and inevitable impurities; the method comprises the following key process steps:
a. continuous casting: special covering slag and an R15 large-chamfer angle crystallizer are adopted; the casting powder R = 0.6-0.7, the melting point is 1000-1050 ℃, the viscosity is 0.22-0.23, the section of the crystallizer is 150mm x 150mm, R =15, the multi-taper is realized, and the maximum taper is 0.95%; casting blank section 150mm x 150mm, pulling speed 1.8-2.0 m/min;
b. heating: the preheating section temperature is 600-650 ℃, the heating section temperature is 1150-1200 ℃, the soaking section temperature is 1200-1220 ℃, and the total furnace-in time of the billet in the heating furnace is 110-150 minutes; strong oxidizing atmosphere, and residual oxygen amount is 5% -7%;
c. rolling and controlled cooling: the tapping temperature is 1140-1160 ℃, the spinning temperature is 910-930 ℃, the cooling rate is 10-15 ℃/S in the temperature range of 930-500 ℃ after spinning, and the cooling rate is 4-8 ℃/S in the temperature range of 550-350 ℃.
The invention has the following advantages:
(1) the special casting powder is adopted for continuous casting, the R15 large-chamfer crystallizer is matched with a proper throwing speed, the generation of recarburization of a casting blank, particularly the corner of the casting blank, is effectively controlled, the surface quality of the casting blank is good, and the steel blank polishing treatment can be avoided;
(2) in the steel rolling heating procedure, the surface burning loss of the casting blank in the furnace is properly increased by improving the heating temperature and the oxidizing atmosphere in the furnace, and the surface casting blank recarburization is reduced;
(3) a controlled cooling process, namely rapidly cooling at the temperature of 930-550 ℃, so that the generation of network cementite is inhibited, and the cementite generated by the surface temperature return of the wire rod can be prevented;
(4) the production process has strong applicability, the casting blank does not need to be ground, and the production cost is low.
Drawings
FIG. 1 is a schematic representation of the structure of a wire rod produced by the method of the present invention.
FIG. 2 is a graph of net carburization of the surface of a wire rod produced without the use of the method of the present invention.
FIG. 3 is a graph showing the net carburization of the surface of the wire rod produced by the method of the present invention.
Detailed Description
The following examples further illustrate the invention.
Example 1: production method of phi 5.5mm X82LB aluminum-clad steel wire rod
The chemical composition of the steel is, by mass, C =0.85, Si =0.25, Mn =0.62, P =0.008, S =0.009, AlT =0.0008, and the balance is Fe and unavoidable impurities. The process and the main parameters are as follows:
81 tons of molten iron and 15 tons of scrap steel are loaded into the converter, the end point carbon is 0.07 percent, the phosphorus is 0.006 percent, the oxygen is determined to be 366PPM, and the tapping temperature is 1595 ℃. A sliding plate is used for double gear in the tapping process, 216kg of low-aluminum low-titanium ferrosilicon, 260kg of metal manganese and 800kg of low-nitrogen carbon powder are added in the alloying mode, 500kg of lime and 301kg of acidic slag modifier are added in top slag.
When the LF furnace is in the station for 85min, 305kg of lime, 499kg of acidic slag modifier and 100kg of SiC are added, a 300m carbon line is fed, 50 metal manganese is additionally added for adjusting components, all chemical components of molten steel hit the internal control range, and the soft blowing time is 46 min.
And (3) adopting the Longcheng cord steel casting powder for continuous casting, carrying out protective casting in the whole process, and using R15 large chamfer angle crystallizer casting powder with the casting speed of 2.0M/Min. The liquidus temperature is 1460 ℃, the lowest value of the tundish molten steel temperature is 1479 ℃, the highest value is 1487 ℃, the lowest value of the superheat degree is 19 ℃, and the highest value is 27 ℃. The fluctuation of the liquid level of the crystallizer is +/-2 mm in the casting process.
The temperature of the heating preheating section is controlled to be 650 ℃, the temperature of the heating section 1190 is controlled to be uniform, 1211, the furnace time is 126 minutes, the spinning temperature is 920 ℃, 100 percent of 1-6 fans are started, a heat preservation cover is opened, and 7-12 fans and the heat preservation cover are not started.
Metallographic examination of the produced wire rod with the diameter of 5.5 mm: the metallographic structure is as follows: sorbite + pearlite + a small amount of ferrite, the sorbite content is 88 percent, and the surface reticular cementite rating is 0 grade. The metallographic detection result of the high-carbon wire rod produced according to the technical scheme is shown in table 1.
Example 2: production method of 13mm high-strength QS92Mn wire rod
The chemical composition of the steel is, by mass, C =0.92, Si =0.24, Mn =0.85, P =0.009, S =0.004, Cr =0.32, and the balance is Fe and inevitable impurities. The process and the main parameters are as follows:
82 tons of molten iron and 14 tons of scrap steel are loaded into the converter, the end point carbon is 0.08 percent, the phosphorus is 0.008 percent, the oxygen is determined by 311PPM, and the tapping temperature is 1598 ℃. A sliding plate is used for double-gear tapping, 216kg of low-aluminum low-titanium ferrosilicon, 450kg of metal manganese and 910kg of low-nitrogen carbon powder are added in an alloying manner, 502kg of lime and 302kg of acidic slag modifier are added in top slag.
And in the LF furnace, the standing time is 90min, lime 301kg, an acidic slag modifier 502kg and 120kgSiC are added, a carbon line of 360m is fed, metal manganese is additionally added for adjusting components, the chemical components of molten steel all hit the internal control range, and the soft blowing time is 36 min.
And (3) adopting the Longcheng cord steel casting powder for continuous casting, carrying out protective casting in the whole process, and using R15 large chamfer angle crystallizer casting powder with the casting speed of 2.0M/Min. The liquidus temperature is 1457 ℃, the lowest value of the tundish molten steel temperature is 1473 ℃, the highest value is 1482 ℃, the lowest value of the superheat degree is 16 ℃, and the highest value is 25 ℃. The fluctuation of the liquid level of the crystallizer is +/-2 mm in the casting process.
The temperature of the heating preheating section is controlled to be 650 ℃, the temperature of the heating section 1192 is controlled to be uniform, 1208, the furnace time is 121 minutes, the spinning temperature is 920 ℃, 100% of 1-10 fans are started, a heat preservation cover is opened, 50% of 11-12 fans are started, and the heat preservation cover is opened.
Metallographic examination of the produced wire rod with the diameter of 13.0 mm: the metallographic structure is as follows: sorbite + pearlite, sorbite content 91%, surface reticulated cementite rating 0. The metallographic detection result of the high-carbon wire rod produced according to the technical scheme is shown in table 1.
Table 1 example wire rod test results
Claims (1)
1. The production process of deep drawing high carbon steel wire rod includes the technological steps of converter steel making → LF furnace refining → continuous casting → heating → rolling → controlled cooling, and features that: the steel comprises the following chemical components, by mass, 0.69-1.02% of C, 0.15-0.35% of Si, 0.40-0.90% of Mn, less than or equal to 0.35% of Cr, less than or equal to 0.025% of P, less than or equal to 0.025% of S, and the balance of iron and inevitable impurities; the method comprises the following key process steps:
a. continuous casting: special covering slag and an R15 large-chamfer angle crystallizer are adopted; the casting powder R = 0.6-0.7, the melting point is 1000-1050 ℃, the viscosity is 0.22-0.23, the section of the crystallizer is 150mm x 150mm, R =15, the multi-taper is realized, and the maximum taper is 0.95%; casting blank section 150mm x 150mm, pulling speed 1.8-2.0 m/min;
b. heating: the preheating section temperature is 600-650 ℃, the heating section temperature is 1150-1200 ℃, the soaking section temperature is 1200-1220 ℃, and the total furnace-in time of the billet in the heating furnace is 110-150 minutes; strong oxidizing atmosphere, and residual oxygen amount is 5% -7%;
c. rolling and controlled cooling: the tapping temperature is 1140-1160 ℃, the spinning temperature is 910-930 ℃, the cooling rate is 10-15 ℃/S in the temperature range of 930-500 ℃ after spinning, and the cooling rate is 4-8 ℃/S in the temperature range of 550-350 ℃.
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| CN202111088459.8A CN113862564A (en) | 2021-09-16 | 2021-09-16 | Production method of deep-drawing high-carbon steel wire rod |
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| CN202111088459.8A CN113862564A (en) | 2021-09-16 | 2021-09-16 | Production method of deep-drawing high-carbon steel wire rod |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114990446A (en) * | 2022-06-21 | 2022-09-02 | 湖南华菱湘潭钢铁有限公司 | Production method of weather-resistant high-strength high-carbon steel |
Citations (5)
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| CN110029275A (en) * | 2019-05-22 | 2019-07-19 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of high voltage transmission line steel |
| CN110747386A (en) * | 2019-10-29 | 2020-02-04 | 江苏省沙钢钢铁研究院有限公司 | Easy-to-pull cord steel wire rod and production method thereof |
| CN111254363A (en) * | 2020-03-31 | 2020-06-09 | 湖南华菱湘潭钢铁有限公司 | Production method of cord wire rod steel |
| CN112359277A (en) * | 2020-10-15 | 2021-02-12 | 中天钢铁集团有限公司 | Control method for segregation and net carbon of 86-level high-strength cord steel wire rod |
| CN114318149A (en) * | 2021-12-28 | 2022-04-12 | 张家港荣盛特钢有限公司 | Grade 102 steel cord, grade 102 cord steel wire rod and production method thereof |
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2021
- 2021-09-16 CN CN202111088459.8A patent/CN113862564A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110029275A (en) * | 2019-05-22 | 2019-07-19 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of high voltage transmission line steel |
| CN110747386A (en) * | 2019-10-29 | 2020-02-04 | 江苏省沙钢钢铁研究院有限公司 | Easy-to-pull cord steel wire rod and production method thereof |
| CN111254363A (en) * | 2020-03-31 | 2020-06-09 | 湖南华菱湘潭钢铁有限公司 | Production method of cord wire rod steel |
| CN112359277A (en) * | 2020-10-15 | 2021-02-12 | 中天钢铁集团有限公司 | Control method for segregation and net carbon of 86-level high-strength cord steel wire rod |
| CN114318149A (en) * | 2021-12-28 | 2022-04-12 | 张家港荣盛特钢有限公司 | Grade 102 steel cord, grade 102 cord steel wire rod and production method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114990446A (en) * | 2022-06-21 | 2022-09-02 | 湖南华菱湘潭钢铁有限公司 | Production method of weather-resistant high-strength high-carbon steel |
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