CN114535290A - Bead steel wire rod and manufacturing method thereof - Google Patents
Bead steel wire rod and manufacturing method thereof Download PDFInfo
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- CN114535290A CN114535290A CN202210336865.XA CN202210336865A CN114535290A CN 114535290 A CN114535290 A CN 114535290A CN 202210336865 A CN202210336865 A CN 202210336865A CN 114535290 A CN114535290 A CN 114535290A
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- Prior art keywords
- wire rod
- bead
- air cooling
- fan
- steel wire
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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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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2275/00—Mill drive parameters
- B21B2275/02—Speed
- B21B2275/04—Roll speed
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention provides a bead steel wire rod and a manufacturing method thereof, the bead steel wire rod contains 0.80-0.85% of carbon, the tensile strength of the bead steel wire rod is 950MPa-1100MPa, the net cementite is less than or equal to 3 grade, the sorbite content is less than or equal to 80%, and the size of a pearlite colony is as follows: 20um to 40 um. The hot-rolled wire rod for the low-strength bead wire, which can be used for industrial production, is produced by the manufacturing method, the tensile strength can be averagely reduced by about 100MPa compared with that of the hot-rolled wire rod for the bead wire of a comparative steel type, and the wire breakage rate is reduced by more than 50% when the hot-rolled wire rod is produced by the same drawing process.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to a bead steel wire rod and a manufacturing method thereof.
Background
The improvement of social economy is benefited, the living standard of people is continuously improved, the transportation industry is rapidly developed, and the automobile industry in China is rapidly increased. The bead wire is generally applied to reinforcement of a tire frame and is the most widely applied material at present, the hot rolled wire rod for the bead wire is used as a main raw material for producing the bead wire, the original main specification is 5.5-6.5mm, and the bead wire is subjected to rough drawing, fine drawing and drawing with different specifications of 2.5-0.9mm and is applied to tires with almost all specifications as an adding material.
Conventionally, under the condition of the same component strength level, when the sorbite content of a wire rod is higher, the net carbon level is lower, the crystal grains are finer, the drawing performance is better, the wire breakage rate is lower, and the production efficiency of a tire bead steel wire manufacturer is favorably improved. Under the guidance of the traditional theory, under the existing industrial standard and production equipment conditions, various raw material wire rod manufacturers mainly improve the production process to improve the sorbite content and reduce the net carbon generation. Because of the capability of equipment and the characteristics of materials, the traditional improvement mode enters the bottleneck, and the influence of different microstructures and mechanical properties on the drawing performance is urgently needed to be researched through process innovation in the industry so as to reduce the wire breakage rate and the die consumption, effectively improve the production efficiency and reduce the production cost.
Disclosure of Invention
The embodiment of the invention provides a bead wire rod and a manufacturing method thereof, which at least solve the problem of high broken wire rate in the related technology.
According to the bead steel wire rod, the carbon content of the bead steel wire rod is 0.80-0.85%, the tensile strength of the bead steel wire rod is 950MPa-1100MPa, the net cementite is less than or equal to grade 3, the sorbite content is less than or equal to 80%, and the size of a pearlite colony is as follows: 20um to 40 um.
Further, the bead wire rod specification is 5.5mm or 6.5mm long.
The manufacturing method of the bead steel wire rod comprises the following steps:
heating, rough rolling, medium rolling, pre-finish rolling, water cooling, spinning and air cooling;
wherein, in the finish rolling stage, the finish rolling inlet temperature is 930-;
in the spinning section, the spinning temperature is 850-;
and in the air cooling stage, fans are arranged at intervals along an air cooling roller way, the No. 1 fan, the No. 2 fan and the No. 3 fan are started, the No. 1 starting air volume is 60-99%, the No. 2 fan starting air volume is 30-50%, the third fan starting air volume is 0-30%, and the heat-insulating cover of the air cooling roller way is completely opened.
The manufacturing method of the bead steel wire rod comprises the following steps:
heating, rough rolling, medium rolling, pre-finish rolling, water cooling, spinning and air cooling;
wherein, in the finish rolling stage, the finish rolling inlet temperature is 930-;
in the spinning section, the spinning temperature is 920-;
and in the air cooling stage, fans are arranged at intervals along an air cooling roller way, the No. 2, the No. 3 and the No. 4 are started, the No. 2 starting air volume is 50-100%, the No. 3 fan starting air volume is 10-30%, the No. 4 fan starting air volume is 0-30%, and the heat-insulating cover of the air cooling roller way is completely opened.
Has the advantages that: compared with the prior art, the hot-rolled wire rod for the low-strength bead wire produced by the manufacturing method can be used for industrial production, the tensile strength can be reduced by about 100MPa on average compared with that of the hot-rolled wire rod for the bead wire of a comparative steel type, and the wire breakage rate is reduced by more than 50% during production by the same drawing process.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a method of manufacturing a bead wire rod according to an embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Example 1
A bead steel wire rod, the carbon content of the bead steel wire rod is 0.80% -0.85%, the tensile strength of the bead steel wire rod is 950MPa-1100MPa, the reticular cementite is less than or equal to 3 grades, the sorbite content is less than or equal to 80%, and the size of a pearlite colony is as follows: 20um to 40 um.
The grades of reticulated cementite are defined as follows:
a) stage 0: there are no network cementite or linear cementite.
b) Level 1: an unsealed reticulated cementite.
c) And 2, stage: 1-2 completely closed netlike cementite, and others are not closed.
d) And 3, level: 3 crystal grains form a fully-closed netlike cementite, and the rest are not closed and the distribution range of the cementite is less than two thirds of the whole field area.
e)4, level: at least 4 crystal grains form a fully closed network cementite.
Further, the bead wire rod specification is 5.5mm or 6.5mm long.
Example 2
Referring to fig. 1, the present embodiment provides a method for manufacturing a bead wire rod, where the bead wire rod manufactured by the method is suitable for drawing by an acid pickling process, and the method includes:
pickling, heating, rough rolling, medium rolling, pre-finish rolling, water cooling, spinning and air cooling;
wherein, in the finish rolling stage, the finish rolling inlet temperature is 930-;
in the spinning section, the spinning temperature is 850-;
and in the air cooling stage, fans are arranged at intervals along an air cooling roller way, the No. 1 fan, the No. 2 fan and the No. 3 fan are started, the No. 1 starting air volume is 60-99%, the No. 2 fan starting air volume is 30-50%, the third fan starting air volume is 0-30%, and the heat-insulating cover of the air cooling roller way is completely opened.
Example 3
Referring to fig. 1, the present embodiment provides a method for manufacturing a bead wire rod, where the bead wire rod manufactured by the method is suitable for drawing by a mechanical shelling process, and includes:
heating, rough rolling, medium rolling, pre-finish rolling, water cooling, spinning and air cooling;
wherein, in the finish rolling stage, the finish rolling inlet temperature is 930-;
in the spinning section, the spinning temperature is 920-;
and in the air cooling stage, fans are arranged at intervals along an air cooling roller way, the No. 2, the No. 3 and the No. 4 are started, the No. 2 starting air volume is 50-100%, the No. 3 fan starting air volume is 10-30%, the No. 4 fan starting air volume is 0-30%, and the heat-insulating cover of the air cooling roller way is completely opened.
The bead wire rods produced by the production methods of comparative example, example 1 and example 2 are compared below.
Specific processing parameters of the comparative example, the example 1 and the example 2 are shown in the table 1, and compared with the production process of the comparative example, the production process of the example 1 and the example 2 adjusts the finish rolling and wire laying temperature, and adjusts the roller speed, the using number of fans and the air volume to achieve the purpose of adjusting the performance of the wire rod, so that the use of the fans is reduced, and the energy consumption is reduced.
TABLE 1 comparative, example 1 and example 2 processing parameters
The test results of the comparative example, the example 1 and the example 2 are shown in the table 2, and the novel low-strength bead wire rod produced by the process method of the example 1 and the example 2 has the advantages that the sorbite content is obviously reduced and is lower than 85 percent, the grain size is smaller than 7, the iron oxide scale meets the requirements of acid washing and mechanical shelling, the grade of the net carbonitriding body meets the grade of less than or equal to 3, the size range of the pearlite colony is controlled to be 20-40um, the tensile strength can be reduced by more than 100MPa, and the expected target is met.
TABLE 2 comparative, example 1 and example 2 test parameters
The drawing breakage rates of the comparative example, the example 1 and the example 2 are shown in table 3, and the novel low-strength bead wire hot-rolled wire rod produced in the example 1 and the example 2 is adopted, so that the breakage rate is reduced by more than 50% under the same conditions, and the drawing production efficiency can be effectively improved.
Table 3 comparative, example 1 and example 2 pull-out tests
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (4)
1. The bead steel wire rod is characterized in that the carbon content of the bead steel wire rod is 0.80-0.85%, the tensile strength of the bead steel wire rod is 950MPa-1100MPa, the content of reticular cementite is less than or equal to 3 grades, the sorbite content is less than or equal to 80%, and the size of a pearlite colony is as follows: 20um to 40 um.
2. The bead wire rod of claim 1 wherein the bead wire rod gauge is 5.5mm or 6.5mm long.
3. A method of making a bead wire rod according to claim 1, comprising:
heating, rough rolling, medium rolling, pre-finish rolling, water cooling, spinning and air cooling;
wherein, in the finish rolling stage, the finish rolling inlet temperature is 930-;
in the spinning section, the spinning temperature is 850-;
and in the air cooling stage, fans are arranged at intervals along an air cooling roller way, the No. 1 fan, the No. 2 fan and the No. 3 fan are started, the No. 1 starting air volume is 60-99%, the No. 2 fan starting air volume is 30-50%, the third fan starting air volume is 0-30%, and the heat-insulating cover of the air cooling roller way is completely opened.
4. A method of making a bead wire rod according to claim 1, comprising:
heating, rough rolling, medium rolling, pre-finish rolling, water cooling, spinning and air cooling;
wherein, in the finish rolling stage, the finish rolling inlet temperature is 930-;
in the spinning section, the spinning temperature is 920-;
and in the air cooling stage, fans are arranged at intervals along an air cooling roller way, the No. 2, the No. 3 and the No. 4 are started, the No. 2 starting air volume is 50-100%, the No. 3 fan starting air volume is 10-30%, the No. 4 fan starting air volume is 0-30%, and the heat-insulating cover of the air cooling roller way is completely opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210336865.XA CN114535290A (en) | 2022-03-31 | 2022-03-31 | Bead steel wire rod and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210336865.XA CN114535290A (en) | 2022-03-31 | 2022-03-31 | Bead steel wire rod and manufacturing method thereof |
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| Publication Number | Publication Date |
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| CN114535290A true CN114535290A (en) | 2022-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210336865.XA Pending CN114535290A (en) | 2022-03-31 | 2022-03-31 | Bead steel wire rod and manufacturing method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825074A (en) * | 2012-09-14 | 2012-12-19 | 南京钢铁股份有限公司 | Bead wire coil rod controlled cooling process |
| CN103817148A (en) * | 2013-12-19 | 2014-05-28 | 江苏省沙钢钢铁研究院有限公司 | Control method for reducing network cementite of steel wire rod for cord thread |
| CN108237146A (en) * | 2017-12-07 | 2018-07-03 | 江苏省沙钢钢铁研究院有限公司 | A kind of method for improving cord steel oxide skin stripping performance |
| CN111069280A (en) * | 2019-11-30 | 2020-04-28 | 江苏省沙钢钢铁研究院有限公司 | Production method of low-strength cord steel wire rod |
| CN112342452A (en) * | 2020-10-15 | 2021-02-09 | 中天钢铁集团有限公司 | Manufacturing method of high-strength wire rod for tire bead steel wire |
-
2022
- 2022-03-31 CN CN202210336865.XA patent/CN114535290A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825074A (en) * | 2012-09-14 | 2012-12-19 | 南京钢铁股份有限公司 | Bead wire coil rod controlled cooling process |
| CN103817148A (en) * | 2013-12-19 | 2014-05-28 | 江苏省沙钢钢铁研究院有限公司 | Control method for reducing network cementite of steel wire rod for cord thread |
| CN108237146A (en) * | 2017-12-07 | 2018-07-03 | 江苏省沙钢钢铁研究院有限公司 | A kind of method for improving cord steel oxide skin stripping performance |
| CN111069280A (en) * | 2019-11-30 | 2020-04-28 | 江苏省沙钢钢铁研究院有限公司 | Production method of low-strength cord steel wire rod |
| CN112342452A (en) * | 2020-10-15 | 2021-02-09 | 中天钢铁集团有限公司 | Manufacturing method of high-strength wire rod for tire bead steel wire |
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