CN112427483B - 14AC-1825 MPa-grade high-strength aluminum-clad steel wire and manufacturing method thereof - Google Patents
14AC-1825 MPa-grade high-strength aluminum-clad steel wire and manufacturing method thereof Download PDFInfo
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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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Abstract
The invention belongs to the field of production processes of high-strength aluminum-clad steel wires, and relates to a 14AC-1825 MPa-grade high-strength aluminum-clad steel wire and a manufacturing method thereof. The aluminum-clad steel wire comprises the following chemical components in percentage by mass: c:0.70-0.74%, si:0.10-0.30%, mn:0.5-0.7%, S is less than or equal to 0.025%, P is less than or equal to 0.020%, cr: less than or equal to 0.10 percent, ni: less than or equal to 0.10 percent, and the balance of Fe and inevitable impurity elements; the specification of the aluminum-clad steel wire is phi 2mm, the tensile strength is more than or equal to 1970MPa, and the 1% elongation stress is more than or equal to 1720MPa. The process step, step 1: selecting a heat treatment line; and 2, step: coating; and step 3: drawing aluminum-clad steel, and step 4: wiping, step 5: and returning the shaft.
Description
Technical Field
The invention belongs to the field of production processes of high-strength aluminum-clad steel wires, and relates to a 14AC-1825 MPa-grade high-strength aluminum-clad steel wire and a manufacturing method thereof.
Background
The aluminum clad steel wire is a metal product with wide application, can be used for overhead conductors, ground wires and OPGWs, can also be used in a plurality of application fields such as guard rails, protection nets, connection strips, protection lines and the like, and the demand of high-strength aluminum clad steel wires is rapidly increased.
At present, high-performance development is carried out along with the development of the power industry and the requirements of foreign markets, the tensile strength of the aluminum-clad steel wire required by the current national standard is not more than 1590MPa, and the requirement of certain power transmission line engineering on the high bearing capacity of the wire cannot be met.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a high-strength aluminum-clad steel wire with 14AC-1825MPa and a manufacturing method thereof.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
14AC-1825MPa level high strength aluminium clad steel wire, its characterized in that: the aluminum-clad steel wire comprises the following chemical components in percentage by mass: c:0.70-0.74%, si:0.10-0.30%, mn:0.5-0.7%, S is less than or equal to 0.025%, P is less than or equal to 0.020%, cr: less than or equal to 0.10 percent, ni: less than or equal to 0.10 percent, and the balance of Fe and inevitable impurity elements; the specification of the aluminum-clad steel wire is phi 2mm, the parameters are that the tensile strength is more than or equal to 1900MPa, the 1% elongation stress is more than or equal to 1590MPa, the elongation after fracture is more than 0.9%, the torsion is more than 20 times, and the aluminum-clad steel wire keeps high strength and also keeps high ductility and toughness indexes.
The manufacturing method of the 14AC-1825 MPa-grade high-strength aluminum-clad steel wire comprises the following steps of 1: selecting a live wire rod; step 2: coating; and 3, step 3: aluminium package steel wire drawing, its characterized in that: further comprising the step 4: wiping, step 5: and returning the shaft.
Further, in the step 1, a fire wire rod with phi of 5.50mm and steel grade of C72A is adopted for heat treatment, and the fire wire rod comprises the following chemical components in percentage by mass: c:0.70-0.74%, si:0.10-0.30%, mn:0.5-0.7%, S is less than or equal to 0.025%, P is less than or equal to 0.020%, cr: less than or equal to 0.10 percent, ni: less than or equal to 0.10 percent, and the balance of Fe and inevitable impurity elements; the tensile strength of the heat treatment live wire rod is 1180-1240MPa, and the elongation (gauge length is 100 mm) is more than or equal to 7%.
Further, in the step 2, an extrusion coating machine is adopted for coating, the temperature in a die cavity of the extrusion coating machine is 320-370 ℃, the coating speed is less than or equal to 130m/min, and the rotating speed of a bull wheel is 2-3r/min.
Further, in the step 2, the extrusion coating machine comprises a guide die and a sizing die, wherein the diameter of the guide die is 0.30-0.60mm larger than that of the steel wire, the diameter of the sizing die is 0.04-0.10mm larger than that of the coated aluminum-clad steel wire, and the axial gap between the guide die and the sizing die is 3-8mm.
Further, in the step 3, the nominal diameter of the coated semi-finished product is 5.85-5.90mm, the semi-finished product of the aluminum-clad steel wire is subjected to drawing forming for 10 times, the average compression ratio is 19.43%, and the total compression ratio reaches 88.47%.
Further, in the step 3, the specific process of 10-pass drawing forming includes:
drawing for the 1 st pass: the diameter is 5.31mm, the compression ratio is 18.72 percent, and the absolute compression amount is 0.58mm;
drawing for the 2 nd pass: the diameter is 4.69mm, the compression rate is 21.99 percent, and the absolute compression amount is 0.62mm;
drawing for the 3 rd pass: the diameter is 4.15mm, the compression rate is 21.70 percent, and the absolute compression amount is 0.54mm;
drawing for the 4 th pass: the diameter is 3.69mm, the compression rate is 20.94 percent, and the absolute compression amount is 0.46mm;
drawing for the 5 th pass: the diameter is 3.30mm, the compression rate is 20.02 percent, and the absolute compression amount is 0.39mm;
drawing for the 6 th pass: 2.96mm in diameter, 19.54% in compression ratio, 0.34mm in absolute compression amount;
drawing for 7 th pass: the diameter is 2.66mm, the compression rate is 19.24 percent, and the absolute compression amount is 0.30mm;
drawing for the 8 th pass: the diameter is 2.40mm, the compression rate is 18.59 percent, and the absolute compression amount is 0.26mm;
drawing for the 9 th pass: the diameter is 2.18mm, the compression rate is 17.49 percent, and the absolute compression amount is 0.22mm;
drawing for the 10 th pass: the diameter is 2.00mm, the compression rate is 15.83 percent, and the absolute compression amount is 0.18mm;
the diameter of the aluminum-clad steel wire is controlled to be +/-0.03 mm.
Further, in the step 4, wiping devices are respectively arranged at the outlet of the drawing machine die box of the last pass and between the wire drawing tank body and the guide wheel.
Further, in the step 5, a straightening device is installed in the shaft returning process and used for straightening the aluminum-clad steel wire.
The invention has the advantages and positive effects that:
the invention provides a novel high-strength aluminum-clad steel wire with the conductivity of 14AC, the nominal diameter of 2.00mm, the tensile strength of not less than 1900MPa and the 1% elongation stress of not less than 1590 MPa. On the premise of ensuring the conductivity, the tensile strength of the cable exceeds 19 percent of the national standard 1590MPa level, the tensile strength is greatly improved, and the cable can be applied to electric power facilities with high bearing capacity and related fields.
In the invention, a corresponding production process is derived according to the design requirements and corresponding parameters, and the process comprises the following steps of 1: selecting a heat treatment live wire rod; step 2: coating; and 3, step 3: aluminum-clad steel wire drawing, 4: wiping, step 5: and a shaft returning component.
According to the technical parameters and corresponding design requirements, the corresponding heat treatment live wire rod is selected through a calculation formula, the phi 5.50mm and the steel grade C72A heat treatment live wire rod are adopted through calculation to produce the aluminum-clad steel wire with corresponding parameters, and the heat treatment live wire rod can also be prepared through a heat treatment process.
In the invention, because the nominal diameter of the selected heat treatment live wire rod is large and the tensile strength of the product is high, the process parameters such as cavity die temperature, cladding speed, bull wheel rotating speed, spacing between a guide die and a sizing die and the like are correspondingly designed in the cladding process. Wherein the cavity die temperature, the coating speed and the bull wheel rotating speed can influence the effect and the smooth degree of tectorial membrane, can effectively avoid the condition of disconnected aluminium to take place, can save the aluminum product again. The sizes and the intervals of the guide die and the sizing die can meet the design requirement of adjusting the nasal sulcus, the thickness of an aluminum layer coated on the steel core is prevented from being out of tolerance or the steel core is prevented from being broken, and the continuity and the completeness of the coating process are ensured.
Compared with the conventional drawing process of the aluminum-clad steel wire, the process has the advantages that the number of the 7-8 passes is increased to 10 passes, and the aluminum-clad steel wire can be drawn from phi 5.89mm to phi 2.00mm. In addition, the compression ratio of each pass is designed correspondingly. The design of the first pass and the second pass is based on the traditional design that the first pass has low compression rate and the second pass has high compression rate. The compressibility of the third to fifth passes is different from that of the conventional process, although the compressibility of each pass is also in a descending trend, the change value is less than 5%, the compressibility of the sixth to ninth passes is less than 6%, and the compressibility of the tenth pass is close to 15%. The design makes the drawing process of the first 9 times in a basically balanced state until the drawing process of the last time is drawn to the required nominal diameter. The drawing process comprehensively considers the tensile strength and the plastic toughness of the aluminum-clad steel wire, so that the aluminum-clad steel wire still meets the design requirement of high plastic toughness index while keeping high strength.
According to the invention, the wiping devices are respectively arranged at the outlet of the die box of the drawing machine in the last pass and between the wire drawing tank body and the guide wheel, so that drawing powder adhered to the surface of the aluminum-clad steel wire can be effectively removed, the surface smoothness of the aluminum-clad steel wire is improved, the bright and clean effect is achieved, and the surface quality is ensured. Because the tensile strength of the aluminum-clad steel wire is high, the straightening device is arranged in the shaft returning process, so that the drawing internal stress of the aluminum-clad steel wire can be obviously reduced.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
14AC-1825MPa level high strength aluminium clad steel wire, its characterized in that: the aluminum-clad steel wire comprises the following chemical components in percentage by mass: c:0.70-0.74%, si:0.10-0.30%, mn:0.5-0.7%, S is less than or equal to 0.025%, P is less than or equal to 0.020%, cr: less than or equal to 0.10 percent, ni: less than or equal to 0.10 percent, and the balance of Fe and inevitable impurity elements; the specification of the aluminum-clad steel wire is phi 2mm, the tensile strength is more than or equal to 1900MPa, the 1% elongation stress is more than or equal to 1590MPa, the elongation after fracture is more than 0.9%, and the torsion is more than 20 times.
The method for manufacturing the 14AC-1825MPa grade high-strength aluminum-clad steel wire comprises the following steps,
step 1: selecting a live wire rod;
in the step 1, a fire wire rod with the diameter of 5.50mm and the steel grade of C72A is adopted for heat treatment, and the heat treatment fire wire rod comprises the following chemical components in percentage by mass: c:0.70-0.74%, si:0.10-0.30%, mn:0.5-0.7%, S is less than or equal to 0.025%, P is less than or equal to 0.020%, cr: less than or equal to 0.10 percent, ni: less than or equal to 0.10 percent, and the balance of Fe and inevitable impurity elements; the tensile strength of the heat treatment live wire rod is 1180-1240MPa, and the elongation (gauge length is 100 mm) is more than or equal to 7%.
And 2, step: coating;
in the step 2, an extrusion coating machine is adopted for coating, the temperature in a die cavity of the extrusion coating machine is 320-370 ℃, the coating speed is less than or equal to 130m/min, and the rotating speed of a bull wheel is 2-3r/min. The extrusion coating machine comprises a guide die and a sizing die, wherein the diameter of the guide die is 0.30-0.60mm larger than that of the steel wire, the diameter of the sizing die is 0.04-0.10mm larger than that of the coated aluminum-clad steel wire, and the axial gap between the guide die and the sizing die is 3-8mm.
And step 3: drawing aluminum-clad steel;
the nominal diameter of the coated semi-finished product of the aluminum-clad steel wire is 5.89mm, the semi-finished product of the aluminum-clad steel wire is subjected to drawing forming for 10 times, the average compression ratio is 19.43 percent, and the total compression ratio reaches 88.47 percent.
Further, in the step 3, the specific process of 10-pass drawing forming includes:
drawing for the 1 st pass: the diameter is 5.31mm, the compression ratio is 18.72 percent, and the absolute compression amount is 0.58mm;
drawing for the 2 nd pass: the diameter is 4.69mm, the compression rate is 21.99 percent, and the absolute compression amount is 0.62mm;
drawing for the 3 rd pass: the diameter is 4.15mm, the compression rate is 21.70 percent, and the absolute compression amount is 0.54mm;
drawing for the 4 th pass: the diameter is 3.69mm, the compression rate is 20.94 percent, and the absolute compression amount is 0.46mm;
drawing for the 5 th pass: the diameter is 3.30mm, the compression rate is 20.02 percent, and the absolute compression amount is 0.39mm;
drawing for the 6 th pass: 2.96mm in diameter, 19.54% in compression ratio, 0.34mm in absolute compression amount;
drawing for 7 th pass: the diameter is 2.66mm, the compression ratio is 19.24 percent, and the absolute compression amount is 0.30mm;
drawing for the 8 th pass: the diameter is 2.40mm, the compression rate is 18.59 percent, and the absolute compression amount is 0.26mm;
drawing for the 9 th pass: the diameter is 2.18mm, the compression rate is 17.49 percent, and the absolute compression amount is 0.22mm;
drawing for a 10 th pass: the diameter is 2.00mm, the compression rate is 15.83 percent, and the absolute compression amount is 0.18mm;
the diameter of the aluminum-clad steel wire is controlled to be +/-0.03 mm.
And 4, step 4: wiping;
and wiping devices are respectively arranged at the outlet of the drawing machine die box of the last pass and between the wire drawing drum and the guide wheel. The wiping device can adopt a structure that holes are made in a wood plate and are embedded with wiping cloth, and other devices which can wipe the outer part of the aluminum-clad steel wire in close contact can also be adopted. The wiping process can also adopt other special devices, such as 201922071932.6 with the patent name of a special device for cleaning the surface of the aluminum-clad steel wire.
And 5: and returning the shaft.
And a straightening device is arranged in the shaft returning process and is used for straightening the aluminum-clad steel wire. For this straightening process, a straightening mechanism or other device with related functions as described in patent No. 2015207750403 may be used.
The invention provides a novel high-strength aluminum-clad steel wire with the conductivity of 14AC, the nominal diameter of 2.00mm, the tensile strength of not less than 1900MPa and the 1% elongation stress of not less than 1590 MPa. On the premise of ensuring the conductivity, the tensile strength of the cable exceeds 19 percent of the national standard 1590MPa level, the tensile strength is greatly improved, and the cable can be applied to electric power facilities with high bearing capacity and related fields.
In the invention, a corresponding production process is derived according to the design requirements and corresponding parameters, and the process comprises the following steps of 1: selecting a heat treatment live wire rod; step 2: coating; and 3, step 3: aluminum-clad steel wire drawing, 4: wiping, step 5: and a shaft returning component.
According to the technical parameters and corresponding design requirements, the corresponding heat treatment live wire rod is selected through a calculation formula, the phi 5.50mm and the steel grade C72A heat treatment live wire rod are adopted through calculation to produce the aluminum-clad steel wire with corresponding parameters, and the heat treatment live wire rod can also be prepared through a heat treatment process.
In the invention, because the nominal diameter of the selected heat treatment live wire rod is large and the tensile strength of the product is high, the process parameters such as cavity die temperature, cladding speed, bull wheel rotating speed, spacing between a guide die and a sizing die and the like are correspondingly designed in the cladding process. Wherein the cavity die temperature, the coating speed and the bull wheel rotating speed can influence the effect and the smooth degree of tectorial membrane, can effectively avoid the condition of disconnected aluminium to take place, can save the aluminum product again. The sizes and the intervals of the guide die and the sizing die can meet the design requirement of adjusting the nasal sulcus, the thickness of an aluminum layer coated on the steel core is prevented from being out of tolerance or the steel core is prevented from being broken, and the continuity and the completeness of the coating process are ensured.
Compared with the conventional drawing process of the aluminum-clad steel wire, the process has the advantages that the number of the 7-8 passes is increased to 10 passes, and the aluminum-clad steel wire can be drawn from phi 5.89mm to phi 2.00mm. In addition, the compression ratio of each pass is designed correspondingly. The design of the first pass and the second pass is based on the traditional design that the first pass has low compression rate and the second pass has high compression rate. The compressibility of the third to fifth passes is different from that of the conventional process, although the compressibility of each pass is also in a descending trend, the change value is less than 5%, the compressibility of the sixth to ninth passes is less than 6%, and the compressibility of the tenth pass is close to 15%. The design enables the drawing process of the first 9 times to be in a basically balanced state until the drawing process of the last time reaches the required nominal diameter. The drawing process comprehensively considers the tensile strength and the plastic toughness of the aluminum-clad steel wire, so that the aluminum-clad steel wire still meets the design requirement of high plastic toughness index while keeping high strength.
According to the invention, the wiping devices are respectively arranged at the outlet of the die box of the drawing machine in the last pass and between the wire drawing tank body and the guide wheel, so that drawing powder adhered to the surface of the aluminum-clad steel wire can be effectively removed, the surface smoothness of the aluminum-clad steel wire is improved, the bright and clean effect is achieved, and the surface quality is ensured. Because the tensile strength of the aluminum-clad steel wire is high, the straightening device is arranged in the shaft returning process, so that the drawing internal stress of the aluminum-clad steel wire can be obviously reduced.
Claims (5)
1. A manufacturing method of a 14AC-1825MPa grade high-strength aluminum-clad steel wire is characterized by comprising the following steps: the aluminum-clad steel wire comprises the following chemical components in percentage by mass: c:0.70-0.74%, si:0.10-0.30%, mn:0.5-0.7%, S is less than or equal to 0.025%, P is less than or equal to 0.020%, cr: less than or equal to 0.10 percent, ni: less than or equal to 0.10 percent, and the balance of Fe and inevitable impurity elements; the specification of the aluminum-clad steel wire is phi 2mm, the parameters are that the tensile strength is more than or equal to 1900MPa, the 1% elongation stress is more than or equal to 1590MPa, the elongation after fracture is more than 0.9%, the torsion is more than 20 times, and the aluminum-clad steel wire keeps high strength and also keeps high ductility and toughness indexes;
the manufacturing method of the aluminum-clad steel wire comprises the following steps: step 1: selecting a heat treatment line; step 2: coating; and step 3: the aluminum-clad steel wire drawing method further comprises the following steps of 4: wiping, step 5: returning the shaft;
in the step 1, a fire wire rod with the diameter of 5.50mm and the steel grade of C72A is adopted for heat treatment, and the heat treatment line comprises the following chemical components in percentage by mass: c:0.70-0.74%, si:0.10-0.30%, mn:0.5-0.7%, S is less than or equal to 0.025%, P is less than or equal to 0.020%, cr: less than or equal to 0.10 percent, ni: less than or equal to 0.10 percent, and the balance of Fe and inevitable impurity elements; the tensile strength of the heat treatment live wire rod is 1180-1240MPa, and the elongation rate with the gauge length of 100mm is more than or equal to 7 percent;
in the step 3, the nominal diameter of the coated semi-finished product is 5.85-5.90mm, the semi-finished product of the aluminum-clad steel wire is subjected to drawing forming for 10 times, the average compression ratio is 19.43 percent, and the total compression ratio reaches 88.47 percent;
in the step 3, the specific process of 10-pass drawing forming comprises the following steps:
drawing for the 1 st pass: the diameter is 5.31mm, the compression ratio is 18.72 percent, and the absolute compression amount is 0.58mm;
drawing 2 nd pass: the diameter is 4.69mm, the compression rate is 21.99 percent, and the absolute compression amount is 0.62mm;
drawing for the 3 rd pass: the diameter is 4.15mm, the compression rate is 21.70 percent, and the absolute compression amount is 0.54mm;
drawing for the 4 th pass: the diameter is 3.69mm, the compression rate is 20.94 percent, and the absolute compression amount is 0.46mm;
drawing for the 5 th pass: the diameter is 3.30mm, the compression rate is 20.02 percent, and the absolute compression amount is 0.39mm;
drawing for the 6 th pass: 2.96mm in diameter, 19.54% in compression ratio, 0.34mm in absolute compression amount;
drawing 7 th pass: the diameter is 2.66mm, the compression rate is 19.24 percent, and the absolute compression amount is 0.30mm;
drawing for the 8 th pass: the diameter is 2.40mm, the compression rate is 18.59 percent, and the absolute compression amount is 0.26mm;
drawing for the 9 th pass: the diameter is 2.18mm, the compression rate is 17.49 percent, and the absolute compression amount is 0.22mm;
drawing for the 10 th pass: the diameter is 2.00mm, the compression rate is 15.83 percent, and the absolute compression amount is 0.18mm;
the tolerance of the diameter of the aluminum-clad steel wire is controlled to be +/-0.03 mm.
2. The method for manufacturing a high-strength 14AC-1825 MPa-grade aluminum-clad steel wire according to claim 1, wherein the method comprises the steps of: in the step 2, an extrusion coating machine is adopted for coating, the temperature in a die cavity of the extrusion coating machine is 320-370 ℃, the coating speed is less than or equal to 130m/min, and the rotating speed of a bull wheel is 2-3r/min.
3. The method for manufacturing a high strength 14AC-1825MPa grade aluminum-clad steel wire according to claim 2, wherein: in the step 2, the extrusion coating machine comprises a guide die and a sizing die, wherein the diameter of the guide die is 0.30-0.60mm larger than that of the steel wire, the diameter of the sizing die is 0.04-0.10mm larger than that of the coated aluminum-clad steel wire, and the axial gap between the guide die and the sizing die is 3-8mm.
4. The method for manufacturing a high-strength 14AC-1825 MPa-grade aluminum-clad steel wire according to claim 1, wherein the method comprises the steps of: and in the step 4, wiping devices are arranged at the outlet of the drawing machine die box of the last pass and between the wire drawing tank body and the guide wheel.
5. The method for manufacturing a high-strength 14AC-1825 MPa-grade aluminum-clad steel wire according to claim 1, wherein the method comprises the steps of: and in the step 5, a straightening device is installed in the shaft returning process and used for straightening the aluminum-clad steel wire.
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