CN112337986B - Process for improving fracture of high-alloy tool steel wire and high-alloy tool steel wire thereof - Google Patents
Process for improving fracture of high-alloy tool steel wire and high-alloy tool steel wire thereof Download PDFInfo
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- CN112337986B CN112337986B CN202011129715.9A CN202011129715A CN112337986B CN 112337986 B CN112337986 B CN 112337986B CN 202011129715 A CN202011129715 A CN 202011129715A CN 112337986 B CN112337986 B CN 112337986B
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- 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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/02—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
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- 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
- B21C9/00—Cooling, heating or lubricating drawing material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B13/00—Bundling articles
- B65B13/18—Details of, or auxiliary devices used in, bundling machines or bundling tools
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention provides a process for improving fracture of a high-alloy tool steel wire rod and the high-alloy tool steel wire rod, which comprises the following steps: heating the blank and rolling a wire rod; a spinning process: changing the straight strip-shaped wire into a coiled wire by a wire-feeding machine, wherein the wire-feeding temperature is controlled to be 810-; cooling and conveying the coiled wire to a stelmor line, closing a fan in the cooling and conveying process, and installing a movable heat-insulating cover in the conveying process; and (4) bundling and bundling. The invention reduces the spinning temperature and controls the cooling water, adopts the process technology control after rolling such as covering a heat preservation cover, quickly bundling and proper bundling pressure, and the like, performs the test and the mass production, and practices prove that the process technology can prevent the tissue transformation caused by the quick cooling after rolling, improves the coiling temperature during bundling, reduces the brittleness of materials, effectively improves the bundling fracture phenomenon after rolling of high alloy tool steel, and simultaneously improves the yield.
Description
Technical Field
The invention relates to the field of ferrous metallurgy, in particular to a process for improving fracture of a high-alloy tool steel wire and the high-alloy tool steel wire.
Background
The high alloy tool steel is an alloy tool steel with high strength, high hardness and high torsion, and has the following carbon content: 0.55-1.0% and 3% -10% of alloy. The hot-rolled steel plate is mainly used for tool products such as screwdriver heads, low-speed machine tools, wrenches and the like, the market demand is large, the product specification range is phi 5.5 mm-phi 17mm, and the delivery state is mainly hot-rolled coils.
The technological process of producing high alloy wire material in five online production lines includes 160 square billet → blank heating → rolling → spinning → STM line cooling → coiling block → manual head and tail trimming → back PF line collection → bundling and weighing → inspection, weighing, packing → packaging and warehousing. According to the traditional post-rolling process technology of high-alloy tool steel wire rods and by combining the characteristics and the process flow of a production line, the post-rolling process technology for producing the high-alloy steel wire rods originally comprises the steps of controlling the spinning temperature after rolling to be about 860 +/-10 ℃, controlling the cooling speed of STM (Stelmor) wires to be less than or equal to 100 ℃/min, collecting PF wires, carrying out bundling at room temperature, bundling at the bundling pressure of 20000kg, coiling coils with the diameters of about 1000mm-1150mm after bundling, and air-cooling and stacking after bundling.
In the process of organizing the produced high-alloy tool steel wire rod according to the process technology, the two ends of the coiled rod after being rolled and bundled always have fracture phenomena, and the fracture is more serious when the specification is smaller, so that the subsequent procedures are checked and trimmed, the coiled rod with serious end breakage even needs to be scrapped in a whole coil, and the yield is greatly reduced. And in the bundling process, the loose coil is conveyed to a bundling station, the coil is clamped by using a clamping device, and then the steel wire is used for bundling so as to facilitate subsequent lightering. In order to reduce the impact of the bundling pressure caused by bundling fracture, if the bundling pressure is reduced to 5000kg, the coil is loosely bundled, the coil shape collapses in the subsequent annealing production process, and the wire is messed in the coil, which brings inconvenience to the subsequent production, therefore, the method of reducing the bundling pressure cannot be implemented.
Disclosure of Invention
Aiming at the defects in the prior art, the technology of furnace annealing after rolling is mainly used for improving or avoiding the bundling fracture of the high alloy tool steel wire after rolling on the basis of the scientific and technological magazines and the discussion sets such as the current academic papers, but the annealing technology is adopted, the fracture phenomenon is less, but the cost is higher. Sometimes, the bundling is broken, and the yield is slightly lower than the design requirement.
The invention provides a process for improving the fracture of a high-alloy tool steel wire and the high-alloy tool steel wire, which reduces the spinning temperature and controls cooling water, adopts the post-rolling process technology control of covering a heat preservation cover, quick bundling, proper bundling pressure and the like, performs tests and mass production, and practices prove that the process technology can prevent the tissue transformation caused by quick cooling after rolling, improves the coiling temperature during bundling, reduces the brittleness of materials, effectively improves the bundling fracture phenomenon of the high-alloy tool steel after rolling, and simultaneously improves the yield.
The present invention achieves the above-described object by the following technical means.
A process for improving high alloy tool steel wire breakage, comprising the steps of:
heating the blank and rolling a wire rod;
a spinning process: changing the straight strip-shaped wire into a coiled wire by a wire-feeding machine, wherein the wire-feeding temperature is controlled to be 810-;
cooling and conveying the coiled wire to a stelmor line, closing a fan in the cooling and conveying process, and installing a movable heat-insulating cover in the conveying process;
and (4) bundling and bundling.
Further, the fan is closed in the wire spinning process, and the local rapid cooling of the wire rod in the coiled state is prevented.
Further, the cooling speed in the cooling and conveying process is less than or equal to 50 ℃/min.
Further, the moving speed of the movable heat-preserving cover is less than or equal to 0.12 m/s.
Further, before bundling, two ends need to be trimmed and cut off during rolling.
Further, the bundling and conveying time is less than or equal to 40 minutes, the coil temperature is controlled to be 100-200 ℃ during bundling, and the bundling pressure is set to be 10000 kg.
Further, the bundled wires are placed in a heat-insulating cover.
A high alloy tool steel wire is prepared by the process for improving the fracture of the high alloy tool steel wire.
The invention has the beneficial effects that:
the process for improving the fracture of the high alloy tool steel wire adopts a post-rolling process technology which controls the spinning temperature, covers a heat-preservation cover, quickly bundles, has proper bundling pressure and preserves heat in time, obviously improves the bundling fracture phenomenon of the high alloy steel wire and improves the yield.
Drawings
FIG. 1 is a process flow diagram for improving high alloy tool steel wire breakage according to the present invention.
FIG. 2 is a metallographic picture of a high alloy tool steel wire prepared according to the prior art.
FIG. 3 is the metallographic picture of a high alloy tool steel wire rod prepared by the process of the invention.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
The inventor always has the problem that the two ends of a coil are easy to break when bundling after rolling in the production process of high-alloy tool steel wires, particularly, the wire with small specification (less than or equal to phi 8mm) is more serious, the broken end is analyzed by sampling, the surface is smooth, the color is bright, no basin or cup exists, the wire is brittle fracture, because the high alloy tool steel has the C content of 0.55-1.0 percent and the alloy content of 3-10 percent, the brittleness of the high alloy tool steel is enhanced along with the increase of the cooling speed in a hot rolling state, the small-specification wire rods are produced by adopting the original process technology, the cooling speed is higher after rolling, the structure transformation is generated, even a martensite structure appears locally, the structure stress is larger, the impact toughness is low, when the subsequent bundling is extruded and impacted by a clamp of a bundling machine, brittle fracture is easy to occur, and if the tissue stress is not eliminated in time, even the tissue stress is naturally brittle fracture after bundling, and the phenomenon of wire mess and the like can be caused by adopting a mode of reducing the bundling pressure, so that the implementation can not be realized. The inventor analyzes and finds that the improvement of the bundling fracture cannot be realized only by reducing the bundling pressure, so that the post-rolling process must be optimized to be an effective method for improving the bundling fracture.
As shown in FIG. 1, the process for improving the fracture of the high alloy tool steel wire rod comprises the following main production process flows:
160 square billet → blank heating → rolling → wire laying → STM line cooling → coiling block → head and tail trimming → back collection of PF line → bundling, weighing → inspection, weighing, packaging → packaging and warehousing.
Wherein the spinning process comprises the following steps: after the rolling specification meets the requirement, the straight strip-shaped wire rod is quickly changed into a coiled wire rod with the diameter of about 1000mm through the wire laying head, and the subsequent production, transportation and the like are facilitated. The temperature of the wire is controlled to be 810-840 ℃ and the target is 820 ℃, and the fan is closed in the wire spinning process, so that the local rapid cooling on the coil is avoided.
And (3) cooling control: cooling and conveying the coiled wire to a Stelmor line, closing a fan in the cooling and conveying process, and installing a movable heat-insulating cover in the conveying process; the heat-insulating cover is hoisted by a crane, the conveying speed is reduced, the main speed is set to be 0.12m/s, and the speed of each group of roller ways is adjusted to stagger the lap joint points of the wire loops, so that the whole coil of wire is uniformly cooled. The cooling speed of the original process which is less than or equal to 100 ℃/min is adjusted and controlled to be less than or equal to 50 ℃/min, the martensite transformation caused by rapid temperature drop is prevented, and the structure transformation stress is reduced.
Bundling control: before bundling, the two ends of the blank are required to be trimmed and cut when the blank is rolled (generally, 8-10 circles are trimmed and cut from the head and the tail). In order to reduce the temperature drop, the trimmed coil is timely conveyed on a PF logistics line, the bundling conveying time is controlled to be less than or equal to 40 minutes, the coil temperature is controlled to be 200 ℃ at 100 ℃ from the original room temperature during bundling, the bundling pressure is set to be 10000kg, the diameter of the bundled steel wire is phi 6.5mm, and the coil is stacked in a heat-preserving cover instead of the original outdoor air cooling after bundling.
According to the fact that the cooling speed after the austenitizing of the steel directly influences the carbide precipitation, the distribution and the microstructure transformation of the steel, the properties of the steel such as impact toughness, strength and the like are directly influenced, tests prove that the rolling and spinning temperature and the cooling speed after rolling are reduced, timely annealing and the like are achieved, the structural stress can be reduced, and the brittleness of the material is reduced. In practice, the post-rolling process technology of controlling the spinning temperature, covering a heat-preservation cover, quickly bundling, properly bundling pressure and preserving heat in time is adopted, the process technology obviously improves the bundling and breaking phenomena of high alloy steel wires, improves the yield and facilitates subsequent production.
According to the process technology control after rolling such as reducing the spinning temperature and controlling the cooling water, covering the heat preservation cover, quickly bundling and properly bundling pressure, the test and the batch production are carried out, and the process technology can prevent the tissue transformation caused by the quick cooling after rolling, improve the coiling temperature during bundling, reduce the brittleness of materials, effectively improve the bundling fracture phenomenon after rolling of high alloy tool steel, and improve the yield at the same time. The production by adopting the process technology improves the fracture phenomenon, reduces the labor amount for the subsequent inspection and trimming procedures, and has no adverse phenomena of disc-shaped collapse, wire disorder in a ring and the like after annealing.
As shown in figure 2, the gold phase diagram of the high alloy tool steel wire rod prepared by the prior art process has an obvious martensite and bainite mixed structure in a wire rod, the hardness is about 50HRC, and brittle fracture is easy to occur in the packaging and transportation processes. The fracture is flat and smooth, and has no deformation and necking phenomenon. According to the metallographic diagram of the high alloy tool steel wire rod prepared by the process, as shown in fig. 3, the structure of the wire rod is obviously improved, abnormal structures such as bainite and martensite do not appear, pearlite is basically used in the material, part of sorbite and chain carbide exist, the hardness is about 30HRC, and the abnormal brittle failure condition does not occur. The fracture has obvious plasticizing tendency and necking is obvious. Table 1 shows the comparison of the mechanical properties of the high alloy tool steel wire prepared by the prior art and the high alloy tool steel wire prepared by the present invention, and the hardness of the overlap joint and the non-overlap joint of the present invention is lower than that of the prior art by combining the metallographic graph.
TABLE 1 comparison of mechanical properties of the prior art and the inventive process
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (4)
1. A process for improving high alloy tool steel wire breakage, comprising the steps of:
heating the blank and rolling a wire rod;
a spinning process: changing the straight strip-shaped wire into a coiled wire by a wire-feeding machine, wherein the wire-feeding temperature is controlled to be 810-;
cooling and conveying the wire rod in the coiled state to a stelmor line, closing a fan in the cooling and conveying process, and installing a movable heat-insulating cover in the cooling and conveying process; the moving speed of the movable heat-preserving cover is less than or equal to 0.12 m/s; the cooling speed in the cooling and conveying process is less than or equal to 50 ℃/min;
collecting and bundling, wherein two ends need to be trimmed and cut off during rolling before bundling; the bundling and conveying time is less than or equal to 40 minutes, the temperature of the wire rod in the coiling state is controlled at 100-200 ℃ during bundling, and the bundling pressure is set at 10000 kg.
2. The process for improving the breakage of the high alloy tool steel wire rod according to the claim 1, wherein the blower is turned off in the wire spitting procedure for preventing the wire rod in a coiled state from locally and rapidly cooling.
3. The process for improving breakage of a high alloy tool steel wire of claim 1, wherein the bundled wire is placed in a heat shield.
4. A high alloy tool steel wire rod, characterized by being produced by the process for improving fracture of a high alloy tool steel wire rod according to any one of claims 1 to 3.
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| CN202011129715.9A CN112337986B (en) | 2020-10-21 | 2020-10-21 | Process for improving fracture of high-alloy tool steel wire and high-alloy tool steel wire thereof |
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| CN202011129715.9A CN112337986B (en) | 2020-10-21 | 2020-10-21 | Process for improving fracture of high-alloy tool steel wire and high-alloy tool steel wire thereof |
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| CN112337986B true CN112337986B (en) | 2022-06-07 |
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| CN114918250A (en) * | 2022-05-21 | 2022-08-19 | 湖南华菱湘潭钢铁有限公司 | Production method for reducing aging time of high-carbon wire rod |
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| CN102161139A (en) * | 2010-12-13 | 2011-08-24 | 首钢总公司 | Production method for manufacturing steel wire rod for X80 pipe line steel submerged arc welding wire |
| CN104233097A (en) * | 2014-09-03 | 2014-12-24 | 马钢(集团)控股有限公司 | Hot-rolled wire rod for manufacturing high-strength steel strand of strong and smart grid and production method of hot-rolled wire rod |
| CN109112246A (en) * | 2017-06-26 | 2019-01-01 | 鞍钢股份有限公司 | Production method of steel wire rod for railway elastic strip fastener formed by direct cold bending |
| CN110016618A (en) * | 2019-05-23 | 2019-07-16 | 攀钢集团攀枝花钢铁研究院有限公司 | High silicon content welding steel and preparation method thereof |
| CN110241356A (en) * | 2019-05-09 | 2019-09-17 | 唐山市德龙钢铁有限公司 | A kind of welding wire gren rod and preparation method thereof |
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2020
- 2020-10-21 CN CN202011129715.9A patent/CN112337986B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102161139A (en) * | 2010-12-13 | 2011-08-24 | 首钢总公司 | Production method for manufacturing steel wire rod for X80 pipe line steel submerged arc welding wire |
| CN104233097A (en) * | 2014-09-03 | 2014-12-24 | 马钢(集团)控股有限公司 | Hot-rolled wire rod for manufacturing high-strength steel strand of strong and smart grid and production method of hot-rolled wire rod |
| CN109112246A (en) * | 2017-06-26 | 2019-01-01 | 鞍钢股份有限公司 | Production method of steel wire rod for railway elastic strip fastener formed by direct cold bending |
| CN110241356A (en) * | 2019-05-09 | 2019-09-17 | 唐山市德龙钢铁有限公司 | A kind of welding wire gren rod and preparation method thereof |
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