CN113275530A - Production method for reducing warping, rooting and scabbing of high-carbon hard wire rod - Google Patents
Production method for reducing warping, rooting and scabbing of high-carbon hard wire rod Download PDFInfo
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- CN113275530A CN113275530A CN202110443325.7A CN202110443325A CN113275530A CN 113275530 A CN113275530 A CN 113275530A CN 202110443325 A CN202110443325 A CN 202110443325A CN 113275530 A CN113275530 A CN 113275530A
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- wire rod
- hard wire
- carbon hard
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- warping
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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
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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
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
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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
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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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- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
Abstract
The invention discloses a production method for reducing warping, rooting and scabbing of a high-carbon hard wire rod, which comprises the following steps: optimizing tissue production, ensuring good production time sequence, improving constant drawing speed ratio, and controlling the drawing speed fluctuation range of the casting machine to be 0.1m/min rising or falling every 20 s; the refining soft blowing time is controlled to be more than 15 minutes, the argon flow control double line is 50NL/min, and the inclusion is ensured to float sufficiently; all the parameter settings of the casting machine meet the production requirements, the covering slag with qualified service performance is added into the crystallizer covering slag to ensure the drying, the slag can be normally melted, and the moisture requirement is less than or equal to 0.5 percent; the actual liquid level of the crystallizer is allowed to fluctuate within +/-5 mm of the set liquid level. The invention aims to provide a production method for reducing warping and rooting scabs of a high-carbon hard wire rod, and effectively reducing the warping and rooting scab rate of the high-carbon hard wire rod.
Description
Technical Field
The invention relates to the technical field of smelting, in particular to a production method for reducing warping, rooting and scabbing of a high-carbon hard wire rod.
Background
The high-carbon hard wire steel is a main raw material for producing steel wires and steel strands for high-strength and low-relaxation prestressed concrete structures, and is widely applied to key workers such as high-rise buildings, large-span bridges, expressways, railways, water conservancy and the like.
Because the production of prestressed steel wires and steel strands requires the multi-pass cold drawing forming of the original wire rod, the original wire rod is required to have good plasticity, and the surface quality of the wire rod is also strictly required.
At present, the productivity of the domestic steel industry is surplus, a plurality of manufacturers for producing high-carbon hard wire rods are provided, and the overall quality of the high-carbon hard wire rods is systematically improved in order to improve the comprehensive competitive strength of steel enterprises. The warp-skin root scab rate of the rolled high-carbon hard wire rod in our factory is counted to be 2.68%. The scab wire rod is completely rejected, so that more rolling waste products are caused, and the production cost is seriously influenced. The reduction of the scab rate of the wire rod is beneficial to improving the rolling yield, reducing the waste amount after rolling, improving the qualified rate of casting blanks, reducing the consumption of steel materials in the steelmaking link and the like, thereby having important significance for reducing the production cost and improving the quality.
The surface quality defect of the casting blank can cause root scabs of a coil rod during rolling, and the quality of the casting blank is one of the comprehensive indexes of the quality and the cost of a steel plant. The casting blank quality is influenced by a plurality of factors, besides the molten steel quality factor, the casting machine parameter setting, the casting powder performance, the production process control process and the like, the casting blank surface quality is improved fundamentally, the problem that the high-carbon hard wire rod is warped and root-scarred is solved, the reason that the existing high-carbon hard wire rod is warped and has a high root-scarred rate needs to be classified and combed, the key factor influencing the high-carbon hard wire rod is warped and has root-scarred is determined, and a feasible improvement measure is provided, so that the high-carbon hard wire rod is reduced.
Disclosure of Invention
The invention aims to provide a production method for reducing warping and rooting scabs of a high-carbon hard wire rod, and effectively reducing the warping and rooting scab rate of the high-carbon hard wire rod.
In order to solve the technical problems, the invention adopts the following technical scheme:
a production method for reducing warping, rooting and scabbing of a high-carbon hard wire rod comprises the following steps:
optimizing tissue production, ensuring good production time sequence, improving constant drawing speed ratio, and controlling the drawing speed fluctuation range of the casting machine to be 0.1m/min rising or falling every 20 s;
the refining soft blowing time is controlled to be more than 15 minutes, the argon flow control double line is 50NL/min, and the inclusion is ensured to float sufficiently;
all the parameter settings of the casting machine meet the production requirements, the covering slag with qualified service performance is added into the crystallizer covering slag to ensure the drying, the slag can be normally melted, and the moisture requirement is less than or equal to 0.5 percent;
the actual liquid level of the crystallizer is allowed to fluctuate within +/-5 mm of the set liquid level.
Further, the method also comprises the following steps: a crystallizer liquid level fluctuation alarm instrument is installed in the main control mode of the casting machine, the alarm is updated to be a voice robot, the crystallizer liquid level fluctuation is prompted to exceed the range of +/-5 mm, when the liquid level fluctuation exceeds +/-5 mm, the alarm instrument gives an alarm to prompt so that a liquid level fluctuation casting blank can be picked out in time, the falling behind treatment is conducted, the defect casting blank is prevented from being sent to a rolling mill to cause rolling scabs, and the generation of scab wire rods is reduced.
Further, the chemical components of the high-carbon hard wire rod comprise, by weight: c: 0.79 to 0.85 percent; si: 0.20-0.40%; mn: 0.60-0.90%; p, S: less than or equal to 0.15 percent; cr: 0.18 to 0.30 percent; v: 0.01 to 0.03 percent; the balance being Fe and unavoidable impurity elements.
Furthermore, the rate of the high-carbon hard wire rod with root and scar in a warped skin shape is obviously improved and is reduced to 0.81 percent from the original 2.68 percent.
Compared with the prior art, the invention has the beneficial technical effects that:
through the process control carding and reforming, the warping and root-scab rate of the high-carbon hard wire rod is obviously improved and is reduced to 0.81 percent from the original 2.68 percent. Compared with the year 2018, the scab rate is reduced by 1.87%, the scab amount is reduced by 1890.68 tons, 166.69 ten thousand yuan is added for a steel mill according to the calculation of the internal settlement price of steel billets and scrap steel, and the cost reduction effect is obvious. Meanwhile, production experience is accumulated, and improvement measures can be transplanted to other casting machines, so that the development is carried out in the special direction of the general rotation of high quality and the excellent rotation of high quality.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a liquid level fluctuation control interface;
fig. 2 is a comparison graph of the rate of high carbon hard wire rod cocked root scarring before and after process improvement.
Detailed Description
A production method for reducing the warping and root scabbing of a high-carbon hard wire rod reduces the occurrence of defects and improves the surface quality of a high-carbon hard wire steel casting blank. The high-carbon hard wire rod comprises the following chemical components in percentage by weight: c: 0.79 to 0.85 percent; si: 0.20-0.40%; mn: 0.60-0.90%; p, S: less than or equal to 0.15 percent; cr: 0.18 to 0.30 percent; v: 0.01 to 0.03 percent; the balance being Fe and unavoidable impurity elements. The production process comprises the following steps: molten iron pretreatment, 100 tons of converters, LF refining, 150 x 150mm small square billet continuous casting and wire rod rolling. The method comprises the steps of firstly classifying the reasons influencing the warping and root scab of the high-carbon hard wire rod, classifying and counting the reasons influencing the warping and root scab rate of the high-carbon hard wire rod within one year, and obtaining the main reasons influencing the warping and root scab rate of the high-carbon hard wire rod, which are the fluctuation of the liquid level of molten steel in a continuous casting crystallizer and account for 90 percent according to the counting result. Therefore, the reason that the warping and root scab rate of the high-carbon hard wire rod is higher due to the influence of the liquid level fluctuation of the molten steel in the crystallizer on the surface quality of the casting blank is classified, summarized, counted and analyzed again, and a targeted correction measure is provided.
Tracking 10 casting times of high-carbon steel smelting and rolling processes, respectively counting the scab rate of the wire rod, and finding that 76.8 percent of scab wire rods have molten steel liquid level fluctuation in a continuous casting crystallizer in the production process through back-check process records, wherein the parameter setting of a casting machine and the performance of casting powder meet the technical requirement standards. It follows from this that: the reason for analyzing the root scabs on the surface of the wire rod is that the defects on the casting blank are both caused by the surface scabs and the subcutaneous air holes of the casting blank, and the surface scabs of the wire rod can be solved only by improving the surface quality of the casting blank. Therefore, the main reason for determining that the surface quality of the casting blank is influenced and the warping root scab rate of the high-carbon hard wire rod is higher is caused by the fluctuation of the liquid level of the molten steel in the continuous casting crystallizer.
The specific control key is as follows:
firstly, the key points are to optimize the tissue production, ensure the good production time sequence, improve the constant drawing speed ratio, and control the drawing speed fluctuation range of the casting machine to be 0.1m/min rising or falling every 20 s. Secondly, the refining soft blowing time is controlled to be more than 15 minutes, the argon flow control double line is 50NL/min, and the inclusion is ensured to float sufficiently. Meanwhile, all the parameter settings of the casting machine meet the production requirements, the covering slag with qualified service performance is added into the crystallizer covering slag to ensure the drying, the slag can be normally melted, and the moisture requirement is less than or equal to 0.5 percent. And finally, by utilizing a crystallizer liquid level control system, obtaining a reasonable control interval of liquid level fluctuation through a corresponding relation between a fluctuation range of a plurality of tests and rolling scabs, and avoiding the casting blank rolling from producing the scabs. The actual liquid level of the crystallizer is allowed to fluctuate within the range of +/-5 mm of the set liquid level, a crystallizer liquid level fluctuation alarm instrument is installed in the main control of the casting machine, the alarm is updated to be a voice robot, the fluctuation of the liquid level of the crystallizer is prompted to exceed the range of +/-5 mm, and a liquid level fluctuation control interface is shown in figure 1. Observing the liquid level fluctuation diagram, when the liquid level fluctuation exceeds +/-5 mm, the alarm instrument can prompt that the liquid level fluctuation casting blank can be picked out in time for falling treatment, so that rolling scabs caused by sending the defect casting blank to a steel mill are prevented, and the generation of scab wire rods is reduced.
The implementation effect is as follows: through the process control carding and reforming, the warping and root-scab rate of the high-carbon hard wire rod is obviously improved and is reduced from the original 2.68% to 0.81%, as shown in figure 2. Compared with the year 2018, the scab rate is reduced by 1.87%, the scab amount is reduced by 1890.68 tons, 166.69 ten thousand yuan is added for a steel mill according to the calculation of the internal settlement price of steel billets and scrap steel, and the cost reduction effect is obvious. Meanwhile, production experience is accumulated, and improvement measures can be transplanted to other casting machines, so that the development is carried out in the special direction of the general rotation of high quality and the excellent rotation of high quality.
TABLE 1 Effect of reducing the scar Rate
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (4)
1. A production method for reducing warping, skinning and rooting scars of a high-carbon hard wire rod is characterized by comprising the following steps:
optimizing tissue production, ensuring good production time sequence, improving constant drawing speed ratio, and controlling the drawing speed fluctuation range of the casting machine to be 0.1m/min rising or falling every 20 s;
the refining soft blowing time is controlled to be more than 15 minutes, the argon flow control double line is 50NL/min, and the inclusion is ensured to float sufficiently;
all the parameter settings of the casting machine meet the production requirements, the covering slag with qualified service performance is added into the crystallizer covering slag to ensure the drying, the slag can be normally melted, and the moisture requirement is less than or equal to 0.5 percent;
the actual liquid level of the crystallizer is allowed to fluctuate within +/-5 mm of the set liquid level.
2. The method for reducing the warping and rooting scarring of the high-carbon hard wire rod according to claim 1, further comprising: a crystallizer liquid level fluctuation alarm instrument is installed in the main control mode of the casting machine, the alarm is updated to be a voice robot, the crystallizer liquid level fluctuation is prompted to exceed the range of +/-5 mm, when the liquid level fluctuation exceeds +/-5 mm, the alarm instrument gives an alarm to prompt so that a liquid level fluctuation casting blank can be picked out in time, the falling behind treatment is conducted, the defect casting blank is prevented from being sent to a rolling mill to cause rolling scabs, and the generation of scab wire rods is reduced.
3. The production method for reducing the warping and furring of the high-carbon hard wire rod according to claim 1, wherein the chemical composition of the high-carbon hard wire rod comprises the following components in percentage by weight: c: 0.79 to 0.85 percent; si: 0.20-0.40%; mn: 0.60-0.90%; p, S: less than or equal to 0.15 percent; cr: 0.18 to 0.30 percent; v: 0.01 to 0.03 percent; the balance being Fe and unavoidable impurity elements.
4. The production method for reducing the warping and rooting of the high-carbon hard wire rod according to claim 1, wherein the warping and rooting rate of the high-carbon hard wire rod is obviously improved and is reduced from 2.68% to 0.81%.
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| CN202110443325.7A CN113275530A (en) | 2021-04-23 | 2021-04-23 | Production method for reducing warping, rooting and scabbing of high-carbon hard wire rod |
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| CN202110443325.7A CN113275530A (en) | 2021-04-23 | 2021-04-23 | Production method for reducing warping, rooting and scabbing of high-carbon hard wire rod |
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Citations (8)
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|---|---|---|---|---|
| US4955216A (en) * | 1988-01-29 | 1990-09-11 | Southwire Company | Method and apparatus for automatically adjusting soluble oil flow rates to control metallurgical properties of continuously rolled rod |
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2021
- 2021-04-23 CN CN202110443325.7A patent/CN113275530A/en active Pending
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| US4955216A (en) * | 1988-01-29 | 1990-09-11 | Southwire Company | Method and apparatus for automatically adjusting soluble oil flow rates to control metallurgical properties of continuously rolled rod |
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Application publication date: 20210820 |