CN112760552B - Production method of steel for tire bead steel wire - Google Patents
Production method of steel for tire bead steel wire Download PDFInfo
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- CN112760552B CN112760552B CN202011539733.4A CN202011539733A CN112760552B CN 112760552 B CN112760552 B CN 112760552B CN 202011539733 A CN202011539733 A CN 202011539733A CN 112760552 B CN112760552 B CN 112760552B
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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
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
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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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C2007/0093—Duplex process; Two stage processes
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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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a production method of steel for a tire bead steel wire, which relates to the technical field of ferrous metallurgy, and comprises the following steps of converter smelting, ladle furnace refining, billet continuous casting and high-speed wire rod rolling: step one, adding scrap steel and blast furnace molten iron into a converter, and providing quality applicable conditions for the scrap steel and the molten iron; step two, controlling the end point carbon content of the converter to be 0.50-0.70 wt%; step three, controlling converter tapping; step four, ladle furnace refining; step five, continuously casting the small square billets, electromagnetically stirring a crystallizer, cooling the secondary cooling by using aerial fog, and continuously casting at the casting speed of 2.0-2.3 m/min; and step six, rolling the high-speed wire rods into hot-rolled wire rods for the bead steel wires with the phi 5.5mm specification through a high-speed wire rod rolling mill. The invention reduces the technological processes of molten iron pretreatment and molten steel secondary vacuum treatment, reduces electromagnetic stirring of a casting area and tail end electromagnetic stirring in continuous casting production, reduces casting blank cogging, casting blank flaw detection, casting blank peeling or casting blank polishing, improves the yield, reduces equipment investment and production cost, and saves energy consumption.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a production method of steel for a tire bead wire.
Background
The bead wire belongs to a high-carbon steel metal product with a coating, is used for reinforcing a rubber product and is mainly used for rubber tires, the strength of the product is continuously improved due to the trend of light weight of automobiles, the product has higher requirements on drawability, evenness of the performance of a poker, steel purity and the like of steel, the production difficulty is higher, and the technical requirements on procedures such as smelting, rolling, processing and the like are higher.
At present, the main process flow for producing the steel for the bead wire at home and abroad is as follows: molten iron pretreatment (molten iron desulfurization/molten iron triple elimination) → converter → ladle furnace refining → RH/VD vacuum treatment → large billet continuous casting (with crystallizer electromagnetic stirring, and/or casting flow zone electromagnetic stirring, and/or end electromagnetic stirring) → continuous casting billet flaw detection → continuous casting billet skinning/coping → cogging rolling → high speed wire rod rolling.
The inevitable system defects of the process flow are shown as follows: 1) the adopted molten iron pretreatment and vacuum treatment processes increase the production cost; 2) the converter smelting adopts a low-drawing recarburization method for production, and impurity elements/components in the recarburization agent pollute molten steel; 3) the cooling water and the power consumption of the adopted casting area electromagnetic stirring and the tail end electromagnetic stirring are increased; 4) continuous casting of a bloom is adopted, secondary cogging is needed, and cogging rolling, flaw detection of a continuous casting billet and peeling/grinding cost of the continuous casting billet are increased.
Disclosure of Invention
The invention aims to provide a new production process for producing steel for a bead wire, which puts forward quality requirements on raw materials (scrap steel and molten iron) entering a furnace and technological control of a converter and a ladle refining furnace, adopts billet continuous casting and high-speed wire rod rolling to produce a wire rod product meeting the quality requirements of the steel for the bead wire, reduces molten iron pretreatment and RH/VD vacuum treatment, reduces electromagnetic stirring and tail end electromagnetic stirring in a continuous casting flow area, reduces continuous casting billet cogging and rolling and casting billet flaw detection/peeling/grinding, improves the yield, reduces the production cost and saves energy under the condition of ensuring the quality of the continuous casting billet and the wire rod product.
In order to achieve the purpose, the invention adopts the technical scheme that:
a production method of steel for a tire bead steel wire comprises the steps of converter smelting, ladle furnace refining, billet continuous casting and high-speed wire rod rolling, and specifically comprises the following steps:
step one, adding scrap steel and blast furnace molten iron into a converter
The scrap steel is self-produced return scrap steel which does not contain Ti, Al, Cu and Zn impurity elements;
the temperature of the blast furnace molten iron is more than or equal to 1300 ℃, and the content of P, S, Ti in the blast furnace molten iron is as follows: p is less than or equal to 0.090 wt%; s is less than or equal to 0.050 wt%; ti is less than or equal to 0.005 wt%;
secondly, controlling the end point carbon content of the converter to be 0.50-0.70 wt%;
step three, tapping from the converter
Pre-top slag is added into a steel ladle in the tapping process, wherein the pre-top slag comprises the following components: lime or/and calcium carbide;
in the tapping process, when the tapping amount is 2/3 of the total tapping amount, adding silicon-manganese alloy or/and calcium carbide into a ladle along with the steel flow;
step four, ladle furnace refining
Building refined white slag in a refining ladle furnace, wherein the refining slag comprises the following raw materials: lime and calcium carbide, controlling alkalinity R22.5-3.5, and controlling Al in the refining slag2O3Content (wt.)<8wt％；
The effective refining time is as follows:
for a calm molten steel during molten steel deoxidation, the floating speed of a brittle inclusion with the equivalent size (diameter d) less than 100 mu m follows the Stokes formula:
the molten steel density is 7000 kg.m under the refining temperature condition of the steel ladle furnace for the bead wire-3Brittle inclusion density 3500kg m-3Then the difference in density between them is Δρ＝3500kg·m-3(ii) a The dynamic viscosity eta of the molten steel is 0.003 Pa.s; the shape coefficient k of the brittle inclusion is 2;
when the diameter of the brittle inclusion is 15 mu m, the floating speed v is 17.15 mm/min;
in combination with the time matching of the furnace, the effective refining time for removing impurities floating to the steel slag-interface by being adsorbed by the slag layer in the refining process is as follows:
τ is h/ν; h is the depth of molten steel in the steel ladle, and v is the floating speed of the brittle inclusions with different diameters;
meanwhile, bubbles of inclusions are removed and removed through collision by reinforcing the argon blowing at the bottom of the steel ladle, and the soft stirring time of the argon blowing at the bottom of the steel ladle is defined as follows:
if the temperature of the ladle furnace is increased after the ladle furnace refining treatment enters soft blowing, but alloy or wire or slag charge is not supplemented, and the argon blowing flow is not increased (bright circle is more than 200mm), the soft blowing time is continuously calculated;
the removal of the inclusions in the molten steel can be further improved by combining the measures;
step five, continuous casting of small square billets, electromagnetic stirring of a crystallizer, cooling by cold air mist, and continuous casting and drawing speed: 2.0-2.3 m/min;
and step six, rolling the high-speed wire rods, and rolling the high-speed wire rods into wire rods for the bead wires through a high-speed wire rod rolling mill.
Further, in the fourth step, the effective refining time of the ladle furnace refining of 100 tons or more is more than or equal to 40 min.
Further, in the fifth step, the electromagnetic stirring parameters of the crystallizer are as follows: current: 240-250A, frequency: 4-6 Hz; cooling with cold air mist, and comparing water amount: 0.7-0.9L/kg; the section size of the continuous casting billet produced by continuous casting is as follows: 150mm by 150 mm.
Further, in the sixth step, the rolling temperature control: 980 +/-30 ℃; controlling the temperature of a finish rolling inlet to be 910 +/-20 ℃; reducing the diameter inlet temperature: 900 plus or minus 20 ℃; controlling the spinning temperature to 880 +/-15 ℃; stelmor air cooling line parameter control: inlet roller table speed: 55-65 m/min; speed of an outlet roller bed: 60-70 m/min; 1-6 fans are started, wherein the opening degrees of the fans are controlled to be 90%; and (3) corresponding to the process control of the heat preservation cover: the 1A-4B sections are opened in winter, the rest sections are closed, and the sections are all opened in summer.
Further, the section size of the wire rod for the bead wire is
The sorbite proportion in the wire rod for the bead wire is more than 85%.
Compared with the prior art, the invention has the beneficial effects that:
compared with the main process flow for producing the steel for the bead wire at home and abroad at present, the invention has the following comparative advantages:
1. the process of molten iron pretreatment and vacuum treatment is reduced, and the production cost is obviously reduced.
2. The converter roughing process adopts a 'high-speed carbon-drawing' smelting process, the end-point carbon content of the converter is controlled to be 0.50-0.70%, the adding amount of a carburant is reduced, the production cost is reduced, the content of impurities brought into molten steel by impurity elements/components in the carburant is reduced, and the purity of the molten steel is improved.
3. The ladle furnace refining process control aims at improving the purity of molten steel and removing impurities in the production of the steel for the bead wire, does not allow the occurrence of brittle inclusions with equivalent size larger than 15 mu m according to the requirements of the steel for the bead wire on the inclusions, and obtains the removal time of the brittle inclusions with equivalent size larger than 15 mu m through theoretical calculation so as to determine the effective refining time of ladle furnace refining.
4. The continuous casting production process reduces electromagnetic stirring in a casting flow area and electromagnetic stirring at the tail end. Through the control of the superheat degree of the molten steel of the tundish and the cooling intensity of the secondary cooling air mist, a qualified continuous casting billet meeting the requirements of the steel for the bead wire can be produced, and the processes of flaw detection of the continuous casting billet and peeling/grinding of the continuous casting billet are reduced.
5. The section size of the continuous casting billet produced by the invention is as follows: 150mm x 150mm, and is directly rolled by a high-speed wire rod rolling mill
A wire rod for a bead wire of a standard. The secondary cogging of the continuous casting billet, the flaw detection of the continuous casting billet and the peeling/grinding process of the continuous casting billet are reduced, and the production cost is obviously reduced.
Detailed Description
The technical solutions and effects of the present invention will be further described with reference to specific examples, but the scope of the present invention is not limited thereto.
Example 1
The production method of the steel for the bead wire comprises the following steps of smeltingSteel, continuous casting and steel rolling process, the continuous casting billet section size of continuous casting output is: 150mm x 150mm, the original wire rod size of the product obtained
The specific production flow is as follows: top-bottom combined blown converter → LF ladle refining furnace → R8 m arc 6 machine 6 flow small square billet continuous casting machine → 150mm multiplied by 150mm section continuous casting billet → high speed wire rod rolling mill controlled rolling → stelmor air cooling line controlled cooling →
Hot rolled wire rod for bead wire of specification.
The key control parameters are as follows: (1) blast furnace molten iron + self-production return scrap steel, molten iron temperature of 1320 ℃, molten iron component content: 0.075 wt% of P, 0.045 wt% of S, 0.0032 wt% of Ti; (2) the converter 'high carbon-pulling' operation is carried out, the content of the end point C is 0.53 wt%, the end point temperature is 1583 ℃, calcium carbide and silicon-manganese alloy are adopted for deoxidation alloying, when the steel tapping amount is 2/3 of the total steel tapping amount, the steel ladle is added along with the steel flow, the adding amount is respectively 52kg and 670kg, and the adding amount of slag material lime on the top of the steel ladle is 350 kg; (3) basicity of refining slag R23.0 of Al in slag2O3The content is 7.1 wt%, and the refining time is 47 min; (4) electromagnetic stirring parameters of the crystallizer: the current is 246A, the frequency is 5Hz, the cooling specific water amount of the secondary cooling air mist is 0.72L/kg, and the drawing speed of the small square billet with the section of 150mm multiplied by 150mm is 2.10 m/min; (5) the initial rolling temperature is 980 ℃, the finish rolling inlet temperature is 910 ℃, the reduced diameter inlet temperature is 900 ℃, the spinning temperature is 880 ℃, the speed of a stelmor air cooling line inlet roller way is 60m/min, the speed of an outlet roller way is 65m/min, the front 6 fans are started, the opening degrees of the fans are controlled to be 90%, the corresponding sections 1A-4B of the heat-insulating cover in winter are opened, and the rest are closed.
Example 2
The production method of the steel for the bead wire provided by the embodiment comprises the following working procedures of steel making, continuous casting and steel rolling, wherein the section size of a continuous casting billet produced by the continuous casting is as follows: 150mm x 150mm, the original wire rod size of the product obtained
The specific production flow is as follows: top-bottom combined blown converter → LF ladle refining furnace → R8 m arc 6 machine 6 flow small square billet continuous casting machine → 150mm multiplied by 150mm section continuous casting billet → high speed wire rod rolling mill controlled rolling → stelmor air cooling line controlled cooling →
Hot rolled wire rod for bead wire of specification.
The key control parameters are as follows: (1) blast furnace molten iron and self-production return scrap steel, wherein the molten iron temperature is 1345 ℃, and the molten iron component content is as follows: p ═ 0.060wt%, S ═ 0.050wt%, Ti ═ 0.0040 wt%; (2) the converter is operated in a high carbon-pulling mode, the content of end point C is 0.58wt%, the end point temperature is 1579 ℃, calcium carbide and silicon-manganese alloy are adopted for deoxidation alloying, when the steel tapping amount is 2/3 of the total steel tapping amount, the steel ladle is added along with steel flow, the adding amount is 45kg and 700kg respectively, and the adding amount of slag lime on the top of the steel ladle is 280 kg; (3) basicity of refining slag R22.8, Al in slag2O3The content is 6.5wt%, and the refining time is 40 min; (4) electromagnetic stirring parameters of the crystallizer: the current is 250A, the frequency is 5Hz, the cooling specific water amount of the secondary cooling air mist is 0.75L/kg, and the drawing speed of the small square billet with the section of 150mm multiplied by 150mm is 2.20 m/min; (5) the initial rolling temperature is 960 ℃, the finish rolling inlet temperature is 900 ℃, the reduced diameter inlet temperature is 880 ℃, the spinning temperature is 870 ℃, the speed of a stelmor air cooling line inlet roller way is 65m/min, the speed of an outlet roller way is 70m/min, the opening degree of the fans is controlled to be 90 percent in the front 6 stages before the fans are started, and the corresponding heat-insulating covers are completely opened in summer.
Example 3
The production method of the steel for the bead wire provided by the embodiment comprises the following working procedures of steel making, continuous casting and steel rolling, wherein the section size of a continuous casting billet produced by the continuous casting is as follows: 150mm x 150mm, the original wire rod size of the product obtained
The specific production flow is as follows: top-bottom combined blown converter → LF ladle refining furnace → R8 m arc 6 machine 6 flow small square billet continuous casting machine → 150mm multiplied by 150mm section continuous casting billet → high speed wire rod rolling mill controlled rolling → stelmor air cooling line controlled cooling →
Hot rolled wire rod for bead wire of specification.
The key control parameters are as follows: (1) blast furnace molten iron and self-production return scrap steel, wherein the molten iron temperature is 1370 ℃, and the molten iron component content is as follows: p is 0.080 wt%; 0.040 wt%; 0.0022 wt% of Ti; (2) the converter is operated in a high carbon-pulling mode, the content of end point C is 0.61 wt%, the end point temperature is 1571 ℃, calcium carbide and silicon-manganese alloy are adopted for deoxidation alloying, when the steel tapping amount is 2/3 of the total steel tapping amount, the steel ladle is added along with steel flow, the adding amount is respectively 50kg and 700kg, and the adding amount of slag lime at the top of the steel ladle is 300 kg; (3) basicity of refining slag R23.3, Al in slag2O3The content is 5.9 wt%, and the refining time is 50 min; (4) electromagnetic stirring parameters of the crystallizer: the current is 246A, the frequency is 6Hz, the cooling specific water amount of the secondary cooling air mist is 0.79L/kg, and the drawing speed of the small square billet with the section of 150mm multiplied by 150mm is 2.15 m/min; (5) the initial rolling temperature is 990 ℃, the finish rolling inlet temperature is 920 ℃, the reduced diameter inlet temperature is 910 ℃, the spinning temperature is 885 ℃, the speed of a stelmor air cooling line inlet roller way is 55m/min, the speed of an outlet roller way is 60m/min, the front 6 fans are started, the opening degrees of the fans are controlled to be 90%, the corresponding sections 1A-4B of the heat-insulating cover in winter are opened, and the rest are closed.
Produced by adopting the process and the flow of the invention
The hot-rolled wire rod for the specification of the bead wire can be used for producing the bead wire through actual use of a plurality of bead wire production plants
The finished tire bead monofilament; the wire rod is subjected to mechanical husking, multi-pass straight-in high-speed drawing, online tempering heat treatment and online bronze plating process treatment, the wire is not broken in the drawing process, and the strength and toughness/plasticity indexes of the finished product/semi-finished product steel wire are equivalent to the product quality of the same wire rod supply manufacturer.
Table 1 lists the low-power quality detection and rating reports of the continuous casting slabs with the 150 mm-150 mm cross sections in examples 1-3. The low-power samples are taken from the casting billets in the front, middle and later stages of the casting process of the continuous casting billet of the furnace, and the total number of the low-power samples is 18.
Table 1 examples 1-3 continuous casting slab low power quality inspection and rating data table
| Item | Carbon bias index of solidification center | Center shrinkage cavity | Center porosity | Center crack | Edge crack | Corner crack |
| Example 1 | 1.08 | 2.0 | 2.0 | Is free of | Is free of | Is free of |
| Example 2 | 1.05 | 1.5 | 1.5 | Is free of | Is free of | Is free of |
| Example 3 | 1.06 | 2.0 | 1.5 | Is free of | Is free of | Is free of |
Table 2 shows examples 1 to 3
And (5) a detection report of the metallographic structure, the mechanical property through ring fluctuation and the brittle inclusions of the hot-rolled wire rod. Giving statistical data of the side parts, 1/2 radiuses and the sorbite proportion of the core part of the wire rod, wherein the sorbite proportion is not lower than 85%; the fluctuation condition of the coil rod mechanical property is detected, and the maximum fluctuation values of the tensile strength Rm and the surface shrinkage Z are respectively 36MPa and 3.5 percent, which shows that the coil rod coil-through property uniformity is good; the sampling mode of the low-power sample of the continuous casting billet is referred to for detecting and sampling longitudinal inclusions of the wire rod, the sampling mode corresponds to the sampling mode, 18 longitudinal samples of the wire rod are intercepted, and the actual observation area is 1072mm2Statistics of brittle inclusions (Al)2O3TiN, etc.).
TABLE 2 data table of metallographic structure, mechanical property fluctuation and inclusion of wire rod in examples 1-3
| Item | The ratio of sorbite of the wire rod% | ΔRm，MPa | ΔZ，MPa | Maximum size of brittle inclusions, mum |
| Example 1 | 90 | 36 | 3.5 | 7 |
| Example 2 | 95 | 24 | 2.2 | 4 |
| Example 3 | 90 | 30 | 2.5 | 5 |
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. A method for improving the performance uniformity of a wire rod for a tire bead wire and reducing the size of inclusions in the wire rod for the tire bead wire is characterized by comprising the following steps of converter smelting, ladle furnace refining, billet continuous casting and high-speed wire rod rolling:
step one, adding scrap steel and blast furnace molten iron into a converter
The scrap steel is self-produced return scrap steel which does not contain Ti, Al, Cu and Zn impurity elements;
the temperature of the blast furnace molten iron is 1345 ℃, and the content of P, S, Ti in the blast furnace molten iron is as follows: p: 0.060 wt%; s: 0.050 wt%; ti: 0.0040 wt%;
step two, controlling the carbon content at the smelting end point of the converter to be 0.58wt% and the end point temperature to be 1579 ℃;
step three, tapping from the converter
Adding pre-top slag into a steel ladle in the tapping process, wherein the pre-top slag is lime, and the adding amount is 280 kg;
in the tapping process, when the tapping amount is 2/3 of the total tapping amount, adding 700kg and 45kg of silicon-manganese alloy and calcium carbide into a ladle along with the flow of steel;
step four, ladle furnace refining
Building refined white slag in a refining ladle furnace, wherein the refining slag comprises the following raw materials: lime and calcium carbide, controlling alkalinity R2=2.8, control Al in refining slag2O3The content is 6.5wt%, and the refining time is 40 min;
step five, small square billet continuous casting and crystallizer electromagnetic stirring: current 250A, frequency 5Hz, secondary cooling air fog cooling: specific water amount of 0.75L/kg, 150mm multiplied by 150mm section small square billet drawing speed: 2.2 m/min;
rolling high-speed wire rods, namely rolling the high-speed wire rods into wire rods for the bead steel wires, wherein the initial rolling temperature is 960 ℃, the finish rolling inlet temperature is 900 ℃, the reduced diameter inlet temperature is 880 ℃, the spinning temperature is 870 ℃, the speed of a stelmor air cooling line inlet roller way is 65m/min, the speed of an outlet roller way is 70m/min, the front 6 fans are started, the opening degrees of the fans are all controlled to be 90%, and the corresponding heat-insulating covers are all opened in summer;
the section size of the wire rod for the bead wire is phi 5.5mm, the sorbite proportion in the wire rod for the bead wire reaches 95%, the maximum fluctuation values of the tensile strength Rm and the surface shrinkage Z are respectively 24 MPa and 2.2%, and the maximum size of brittle inclusions in the wire rod for the bead wire is 4 mu m.
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| CN113293333B (en) * | 2021-05-21 | 2022-05-06 | 石横特钢集团有限公司 | Production method of weather-resistant angle steel billet |
| CN113714281A (en) * | 2021-08-28 | 2021-11-30 | 金鼎重工有限公司 | Method for producing phi 22mm large-size hot-rolled wire rod |
| CN113862552B (en) * | 2021-09-10 | 2022-07-22 | 首钢长治钢铁有限公司 | Steel wire rod for welding and preparation method thereof |
| CN113770652B (en) * | 2021-09-13 | 2024-04-02 | 泰州市新龙翔金属制品有限公司 | Energy-saving disc round steel processing technology |
| CN116875873B (en) * | 2023-09-08 | 2023-12-22 | 江苏省沙钢钢铁研究院有限公司 | Method for recycling cord thread/tire bead waste steel wire and preparing wire rod by using same |
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| CN103397156A (en) * | 2013-07-25 | 2013-11-20 | 张家港市胜达钢绳有限公司 | Wire manufacturing method |
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