CN115572909A - Preparation method of hot-rolled wire rod for blasting lead - Google Patents
Preparation method of hot-rolled wire rod for blasting lead Download PDFInfo
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- CN115572909A CN115572909A CN202211339680.0A CN202211339680A CN115572909A CN 115572909 A CN115572909 A CN 115572909A CN 202211339680 A CN202211339680 A CN 202211339680A CN 115572909 A CN115572909 A CN 115572909A
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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
- 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
- B21B1/16—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 wire rods, bars, merchant bars, rounds wire or material of like small cross-section
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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
- 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
- B21B37/76—Cooling control on the run-out table
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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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
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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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
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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
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
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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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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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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- 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
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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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
- 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
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a preparation method of a hot-rolled wire rod for a blasting lead, and belongs to the technical field of hot-rolled wire rod manufacturing. The hot-rolled wire rod comprises the following components in percentage by weight: c:0.030 to 0.050 percent of Si, less than or equal to 0.030 percent of Mn, less than or equal to 0.23 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.20 percent of Ni, less than or equal to 0.20 percent of Cr, less than or equal to 0.20 percent of Cu, and the balance of iron and inevitable impurities; the production process flow of the hot-rolled wire rod comprises smelting and controlled rolling and controlled cooling processes, and the smelting process flow comprises the following steps: the technological process of molten iron pretreatment → converter → LF refining → continuous casting, controlled rolling and controlled cooling is as follows: heating in a heating furnace → descaling under high pressure → rolling → slow cooling. According to the invention, through special chemical component design and optimized production process, the continuous casting square billet production and controlled rolling and controlled cooling are adopted to produce the hot rolled wire rod, so that safe and reliable detonation in the subsequent use process is realized, and the customer blasting cost is reduced by saving metals such as copper, aluminum and the like.
Description
Technical Field
The invention belongs to the technical field of hot-rolled wire rod manufacturing, and particularly relates to a preparation method of a hot-rolled wire rod for a blasting lead.
Background
The steel for the blasting lead usually adopts a low-carbon steel wire rod, the steel has special use performance and a complex use environment, the steel is required to have good toughness and conductivity and certain tensile strength, the existing blasting lead has many defects, such as high deformation resistance, poor conductivity and the like, and the research and development of the preparation method of the hot-rolled wire rod for the blasting lead, which can realize safe and reliable initiation in the subsequent use process and save metals such as copper, aluminum and the like, become an important subject to be researched urgently at present through the design and the optimization of the production process by special chemical components.
Disclosure of Invention
The invention aims to provide a preparation method of a hot-rolled wire rod for a blasting lead. According to the invention, through special chemical component design innovation and process innovation, certain strength is ensured, and meanwhile, the requirement of low-resistance conductivity is met, the mutual restriction relationship between the strength and the conductivity is comprehensively considered, so that the dual requirements of strength and conductivity are considered for the wire rod, and the quality of the blasting line is improved.
The purpose of the invention is realized by the following modes:
the invention provides a preparation method of a hot-rolled wire rod for a blasting lead, which comprises the following components in percentage by weight: c:0.030 to 0.050 percent of Si, less than or equal to 0.030 percent of Mn, less than or equal to 0.23 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.20 percent of Ni, less than or equal to 0.20 percent of Cr, less than or equal to 0.20 percent of Cu, and the balance of iron and inevitable impurities; the production process flow of the hot-rolled wire rod comprises smelting and controlled rolling and controlled cooling processes.
Based on the technical scheme, the smelting process comprises the following steps: molten iron pretreatment → converter → LF refining → continuous casting.
Based on the technical scheme, further, the molten iron pretreatment comprises deep desulfurization treatment, and the molten iron composition is controlled before the molten iron pretreatment: p is less than or equal to 0.120 percent, S is less than or equal to 0.030 percent, si: 0.20-0.70%, and the temperature of molten iron is more than or equal to 1270 ℃.
Based on the technical scheme, the converter process comprises the following steps: the soft argon blowing time is more than or equal to 5min, and the furnace turning times are less than or equal to one time.
Based on the technical scheme, the LF refining process comprises the following steps: micro-positive pressure is adopted, calcium treatment is adopted, and the soft argon blowing time is more than or equal to 12min.
Based on the technical scheme, further, the continuous casting process comprises the following steps: the degree of superheat of the casting furnace is less than or equal to 45 ℃, the degree of superheat of the continuous casting furnace is less than or equal to 40 ℃, the pulling speed is 2.0-2.6m/min, the specific water amount of the secondary cooling water is 1.2, and protective casting is adopted in the whole process.
Based on the technical scheme, further, the process flow of controlled rolling and controlled cooling is as follows: heating in a heating furnace → descaling under high pressure → rolling → slow cooling.
Based on the technical scheme, further, the heating schedule of the heating furnace is as follows: the temperature of the preheating section is 880 +/-50 ℃, the temperature of the heating section is 1080 +/-50 ℃, and the temperature of the soaking section is 1120 +/-30 ℃; the furnace time is as follows: 1.5-3h.
Based on the technical scheme, further, the water pressure requirement of the high-pressure water dephosphorization is more than or equal to 14MPa; after descaling, no visible residual iron scale is left on the surface of the billet.
Based on the technical scheme, further, the rolling temperature is controlled as follows: 1 entrance of 1000 +/-30 ℃, finish rolling entrance of 900 +/-30 ℃ and spinning of 920 +/-20 ℃.
Based on the technical scheme, further, slow cooling ensures that the cooling speed of the coil on the roller way is 0.4-0.8 ℃/s.
Based on above-mentioned technical scheme, further, slowly cool including the slow cold and heat preservation passageway of forced air cooling supply line slowly cool.
The invention also provides the hot-rolled wire rod for the blasting lead prepared by the preparation method.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, through special chemical component design and optimized production process, the continuous casting square billet production and controlled rolling and controlled cooling are adopted to produce the hot rolled wire rod, so that safe and reliable detonation in the subsequent use process is realized, and the customer blasting cost is reduced by saving metals such as copper, aluminum and the like.
2. The invention overcomes various defects easily occurring in the production process of the continuous casting square billet in the existing equipment capability range, and ensures the subsequent processing and use effects.
3. The research of the novel process lays a technical foundation for the production and process improvement of other steel grades.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings to which the embodiments relate will be briefly described below.
Fig. 1 is a metallographic structure of a wire rod prepared in example 1.
FIG. 2 shows the macrostructure of the cast slab prepared in example 1.
Fig. 3 is the surface quality of the wire rod prepared in example 1.
Detailed Description
The present invention is described in detail below with reference to examples, but the embodiments of the present invention are not limited thereto, and it is obvious that the examples in the following description are only some examples of the present invention, and it is obvious for those skilled in the art to obtain other similar examples without inventive exercise and falling into the scope of the present invention.
Examples 1 to 5
The embodiment provides a preparation method of a hot rolled wire rod for a blasting lead, the components and weight percentage of the hot rolled wire rod of the embodiments 1 to 5 are shown in table 1, and the production process flow of the hot rolled wire rod for the blasting lead comprises smelting and controlled rolling and controlled cooling processes;
1. smelting
The method comprises the steps of molten iron pretreatment → converter → LF refining → continuous casting (electromagnetic stirring, protective pouring and end electromagnetic stirring);
1.1 molten iron pretreatment: the specific data of the components and the temperature of the molten iron are shown in the table 2, and the specific data of the molten iron after deep desulfurization pretreatment are as follows: adding lime powder 2.15-2.85kg/t, magnesium powder 0.64-0.71kg/t, exit temperature 1324 deg.C, exit S content 0.004-0.006%;
1.2 converter process: the soft argon blowing time and the number of times of furnace reversal are shown in Table 2.
1.3 refining procedure: micro-positive pressure is adopted, calcium treatment is adopted, the soft argon blowing time is more than or equal to 12min, and specific parameters are shown in a table 3;
1.4 continuous casting process: the degree of superheat of the casting furnace is less than or equal to 45 ℃, the degree of superheat of the continuous casting furnace is less than or equal to 40 ℃, the pulling speed is 2.0-2.6m/min, the specific water amount of the secondary cooling water is 1.2, and the whole process adopts protective casting, wherein the specific parameters are shown in table 3;
2. controlled rolling and cooling
Comprises heating in a heating furnace → descaling under high pressure → rolling → air cooling transportation line slow cooling, tail cutting → coil collecting → coil unloading → PF transportation line transportation, heat preservation channel slow cooling → head cutting, sampling, quality inspection → packing → warehousing.
2.1 heating schedule of the heating furnace:
the specific parameters of the preheating section temperature, the heating section temperature, the soaking section temperature and the in-furnace time are shown in the table 4;
2.2 the values of the phosphorus removal water pressure under high pressure are specifically shown in the table 4; after descaling, no visible residual iron scale is left on the surface of the billet.
2.3 rolling temperature control:
specific numerical values of 1 frame inlet temperature, finish rolling inlet temperature and spinning temperature are shown in table 4;
2.4 cooling the wire: comprehensively ensuring that the cooling speed of the coil on the roller way is 0.4-0.8 ℃/s;
2.4.1 fan cooling process control:
see table 5 for the overall opening settings of the blower, the air door and the good spirit.
2.4.2 setting parameters of the air cooling roller way:
see table 6 for specific values of head roller table speed and roller table acceleration.
2.4.3 Heat preservation cover setting:
see table 7 for the 16 insulation covers to be opened in a coordinated manner.
2.4.4 setting of heat preservation channel:
and slow cooling is ensured in the heat preservation channel.
TABLE 1 specification, composition and weight percent of hot rolled wire rod
TABLE 2 molten iron conditions and converter control conditions
TABLE 3 refining and continuous casting control conditions
TABLE 4 Rolling temperature control parameters
TABLE 5 Fan control conditions
TABLE 6 roller table speed control conditions
| Examples of the invention | Head roller way/m/s | Roller bed acceleration/%) |
| Example 1 | 0.20 | 2 |
| Example 2 | 0.20 | 2 |
| Example 3 | 0.21 | 2 |
| Example 4 | 0.22 | 2 |
| Example 5 | 0.21 | 2 |
TABLE 7 Heat preservation cover Condition settings
TABLE 8 microstructure and physical Properties of the Hot rolled wire rod
As can be seen from Table 8, the hot rolled wire rods prepared in examples 1 to 5 had a microstructure of ferrite + a small amount of pearlite, a tensile strength of not more than 350MPa, an elongation after fracture of not less than 35%, and an electric conductivity of not less than 14.5%; the macroscopic structure defect level is below 0.5 level, the surface quality of the wire rod meets the standard requirement, and the processing performance and the conductivity of the wire rod are ensured.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The preparation method of the hot rolled wire rod for the blasting lead is characterized in that the hot rolled wire rod comprises the following components in percentage by weight: c:0.030 to 0.050 percent of Si, less than or equal to 0.030 percent of Mn, less than or equal to 0.23 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, less than or equal to 0.20 percent of Ni, less than or equal to 0.20 percent of Cr, less than or equal to 0.20 percent of Cu, and the balance of iron and inevitable impurities; the production process flow of the hot-rolled wire rod comprises smelting, controlled rolling and controlled cooling processes;
the smelting process comprises the following steps: molten iron pretreatment → converter → LF refining → continuous casting;
the process flow of controlled rolling and controlled cooling comprises the following steps: heating furnace heating → high-pressure water descaling → rolling → slow cooling.
2. The manufacturing method according to claim 1, wherein the molten iron pretreatment includes a deep desulfurization treatment, and the composition of molten iron before the molten iron pretreatment is controlled by: p is less than or equal to 0.120 percent, S is less than or equal to 0.030 percent, si: 0.20-0.70%, and the temperature of molten iron is more than or equal to 1270 ℃.
3. The production method according to claim 1, wherein the converter step: the soft argon blowing time is more than or equal to 5min, and the furnace turning times are less than or equal to one time.
4. The method of claim 1, wherein the LF refining process comprises: micro-positive pressure is adopted, calcium treatment is adopted, and the soft argon blowing time is more than or equal to 12min.
5. The production method according to claim 1, characterized in that the continuous casting process: the degree of superheat of the casting furnace is less than or equal to 45 ℃, the degree of superheat of the continuous casting furnace is less than or equal to 40 ℃, the pulling speed is 2.0-2.6m/min, the specific water amount of the secondary cooling water is 1.1-1.4, and the whole process adopts protective casting.
6. The production method according to claim 1, wherein the heating furnace heating schedule is: the temperature of the preheating section is 880 +/-50 ℃, the temperature of the heating section is 1080 +/-50 ℃, and the temperature of the soaking section is 1120 +/-30 ℃; the furnace time is as follows: 1.5-3h.
7. The preparation method of claim 1, wherein the water pressure requirement for dephosphorization under high pressure is not less than 14MPa.
8. The production method according to claim 1, wherein the rolling temperature is controlled by: 1 entrance of 1000 +/-30 ℃, finish rolling entrance of 900 +/-30 ℃ and spinning of 920 +/-20 ℃.
9. The method of claim 1, wherein the slow cooling ensures that the cooling rate of the coil on the roller table is 0.4-0.8 ℃/s.
10. The hot rolled wire rod for blasting fuse produced by the production method according to any one of claims 1 to 9.
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