CN110924202A - Production method of 2160MPa high-strength galvanized steel strand for stay cable - Google Patents
Production method of 2160MPa high-strength galvanized steel strand for stay cable Download PDFInfo
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- CN110924202A CN110924202A CN201911213179.8A CN201911213179A CN110924202A CN 110924202 A CN110924202 A CN 110924202A CN 201911213179 A CN201911213179 A CN 201911213179A CN 110924202 A CN110924202 A CN 110924202A
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0606—Reinforcing cords for rubber or plastic articles
- D07B1/066—Reinforcing cords for rubber or plastic articles the wires being made from special alloy or special steel composition
-
- 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
- B21C1/04—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums with two or more dies operating in series
-
- 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
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/38—Wires; Tubes
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2001—Wires or filaments
- D07B2201/201—Wires or filaments characterised by a coating
- D07B2201/2011—Wires or filaments characterised by a coating comprising metals
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/30—Inorganic materials
- D07B2205/3021—Metals
- D07B2205/3025—Steel
- D07B2205/3032—Austenite
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/30—Inorganic materials
- D07B2205/3021—Metals
- D07B2205/3071—Zinc (Zn)
Abstract
The invention relates to the technical field of steel strands, in particular to a production method of 2160MPa high-strength galvanized steel strands for stay cables, which comprises the following process steps: -selecting a material; -heat treatment of the wire rod; -acid washing, phosphating; -drawing; a multi-group electrolytic alkali washing and acid washing combined plating pretreatment; -hot galvanizing; -finishing the surface; twisting and stabilizing treatment; -layer winding. The hot galvanizing prestressed steel strand produced by the process method provided by the invention has low cost and high tensile strength, and can be used for cables of bridges, anchoring tension members, tension members for lifting and fixing and other members of civil engineering.
Description
Technical Field
The invention relates to the technical field of steel strands, in particular to a production method of 2160MPa high-strength galvanized steel strands for stay cables.
Background
The hot galvanizing prestressed steel strand is mainly suitable for cables of bridges, anchoring tension members, tension members for lifting and fixing and other members in civil engineering. The tensile strength index of the hot-dip galvanized prestressed steel strand is of great importance, and how to improve the tensile strength of the hot-dip galvanized prestressed steel strand and save the cost is to meet the requirements of bridge cables, anchoring tension members and the like, so that the hot-dip galvanized prestressed steel strand becomes the main research and development direction of various research and development units and production units.
Disclosure of Invention
The invention aims to solve the technical problem of providing a production method of 2160MPa high-strength galvanized steel strand for stay cable.
The invention is realized by the following technical scheme:
the production method of the 2160MPa high-strength galvanized steel strand for the stay cable comprises the following process steps:
-selecting a material; the raw material is a wire rod, the carbon content fraction of the raw material and the microalloying of the raw material are improved, and the P, S, Cu element content in the wire rod is strictly controlled.
-heat treatment of the wire rod; firstly, a wire rod enters a heating furnace to be heated through a preheating section, a heating section and a soaking section to obtain austenitic steel, and then enters a lead pot to be cooled to obtain sorbite;
-acid washing, phosphating;
-drawing; adopting active stirring lubrication and rotary cooling die combination for multi-pass drawing, namely a small-angle and long die core wire-drawing die, wherein the working taper angle of the wire-drawing die is as follows: 8-10 degrees, length of mold core: 28-35 mm;
a multi-group electrolytic alkali washing and acid washing combined plating pretreatment;
-hot galvanizing; the method adopts the EMW electromagnetic induction wiping technology in New Zealand, and the zinc feeding amount is controlled to be 220-260g/m 2;
-finishing the surface;
twisting and stabilizing treatment;
-layer winding;
further, the air-fuel ratio of the preheating section, the heating section and the soaking section is α1Respectively 125, 95 and 85, the furnace temperature is 965 ℃, 955 ℃ and 945 ℃, the lead temperature is 550 +/-5 ℃, and the linear speed is 3.5 m/min.
Further, the drawing is carried out by 9-pass continuous drawing, the cooling mode is water cooling and narrow-slit air cooling of the tank body, the drawing speed V is 2.5-3.0m/sec, and the linear temperature does not exceed the critical temperature of 70-80 ℃ in the steel wire drawing process.
Further, in hot galvanizing, zinc temperature: 460 ℃ and 465 ℃; and (3) galvanizing vehicle speed: v25 m/min, EMW electromagnetic current: i is0#＝270A。
Further, at the time of finishing, the linear velocity V was 1.5 m/s.
Further, in the twisting and stabilizing treatment, the heating temperature: 380 ℃, set tension: 124kN, twisting speed: 40-50m/min, lay length: 215 mm.
The invention has the advantages of
The steel strand produced by the production method of the 2160MPa high-strength galvanized steel strand for the stay cable provided by the invention has low cost and high strength, the tensile strength of the galvanized steel strand with the diameter of 1 multiplied by 7-phi 15.2mm can be improved from the original 1860MPa to 2160MPa, and the maximum force elongation is more than or equal to 4.5 percent; the surface shrinkage of the monofilament is more than or equal to 25 percent, 385MPa periodic load is applied in an axial fatigue test, and the monofilament does not break after 200 ten thousand times. The steel is applied to cables, anchoring tension members, lifting and fixing tension members of bridges and other members in civil engineering, the steel consumption can be saved by about 15 percent, the overall weight of the bridges is effectively reduced, the construction time is shortened, and the stability of the engineering quality is ensured. The cable has high corrosion resistance and high fatigue resistance, can greatly prolong the service life of members such as cables and the like, has obvious economic benefit and social benefit, and can increase the aesthetic feeling when being used for urban bridge construction because the appearance is coated with beautiful colors.
Drawings
FIG. 1 is a flow chart of the production process of the present invention;
Detailed Description
The production method of the 2160MPa high-strength galvanized steel strand for the stay cable comprises the following process steps:
-selecting a material; the raw material is a wire rod, the carbon content fraction of the raw material and the microalloying of the raw material are improved, and the P, S, Cu element content in the wire rod is strictly controlled.
Specifically, taking 1 × 7-15.2 mm galvanized-2160 MPa grade as an example, a domestic 14.0mm (QS90#) wire rod is selected as a heat treatment raw material for a steel strand, and when the domestic 14.0mm stay cable special wire rod (QS90#) wire rod is selected, the chemical components are shown in Table 1:
TABLE 1
The mechanical properties and microstructure of the wire rod before heat treatment are shown in table 2:
TABLE 2
-heat treatment of the wire rod; firstly, a wire rod enters a heating furnace to be heated through a preheating section, a heating section and a soaking section to obtain austenitic steel, and then enters a lead pot to be cooled to obtain sorbite;
taking 1X 7-phi 15.2mm zinc-plated-2160 MPa grade as an example, the heat treatment process parameters are shown in Table 3:
TABLE 3
The wire rod after heat treatment has refined crystal grains, eliminated structure defect and raised structure stability, component homogeneity and performance. The mechanical property microstructure of the wire rod after heat treatment is shown in table 4:
TABLE 4
-acid washing, phosphating; impurities remained on the surface after heat treatment can be removed, and the drawing effect is ensured.
-drawing; adopting active stirring lubrication and rotary cooling die combination for multi-pass drawing, namely a small-angle and long die core wire-drawing die, wherein the working taper angle of the wire-drawing die is as follows: 8-10 degrees, length of mold core: 28-35 mm;
taking the zinc-plated grade of-2160 MPa with the thickness of 1 multiplied by 7-phi 15.2mm as an example,
Φ 14.0mm → Φ 5.18+0.02(5.36+0.02 core) mm Q total 86.31%, N9, Q total 19.85%, the specific wire drawing process route is shown in table 5:
TABLE 5
The light ray examination test data of the semi-finished product after drawing are shown in the table 6:
TABLE 6
A multi-group electrolytic alkali washing and acid washing combined plating pretreatment; can be removed to ensure the cleanliness of the surface of the steel wire before plating and obtain a continuous and uniform zinc plating layer without plating leakage.
-hot galvanizing; the method adopts the EMW electromagnetic induction wiping technology in New Zealand, and the zinc feeding amount is controlled to be 220-260g/m 2;
for the example of 1X 7-phi 15.2mm galvanized-2160 MPa grade, the test data of the galvanized steel wires are shown in Table 7:
TABLE 7
-finishing the surface; taking the galvanized grade of 1 multiplied by 7 to phi 15.2mm and the grade of 2160MPa as an example, the specific process and the test data of the finished steel wire are as follows:
a. outer layer silk: phi is 5.24mm → 5.08mm, the diameter of a finished product die is 5.08mm, and the diameter of the finished steel wire is 5.08-5.10 mm;
b. center wire: phi is 5.42mm → 5.29mm, the diameter of the finished product die is 5.29mm, and the diameter of the finished steel wire is 5.29-5.31 mm;
the test data of the finished steel wire is shown in the table 8:
TABLE 8 Steel wire inspection test data of finished products
Twisting and stabilizing treatment; determining proper stabilizing temperature and tension as the key to ensure tensile strength, relaxation performance, extensibility and straightening property of the galvanized steel strand, and completing the stabilizing treatment process by adopting rapid induction heating under tension, wherein the optimal process state can be reached by adjusting the linear velocity, the tension and the temperature; the stabilizing production process parameters of the hot galvanizing prestressed steel strand are as follows:
a. heating temperature setting 380 deg.C (inlet 45)
b. Set tension of 124kN
c. Twisting speed: 40-50m/min
d. Lay length: 215 mm;
meanwhile, in order to ensure that the hot-dip galvanized prestressed steel strand has good surface quality, in the twisting process, in order to ensure that the steel wire is not accidentally scraped and rubbed in the walking process, a large-diameter smooth hard alloy die is additionally arranged at all through wire holes of the strand pay-off machine; the metal wire combining die is replaced by a hard plastic wire combining die so as to reduce the abrasion to the steel wire; the second tension wheel is additionally provided with a group of wiping devices for clearing zinc scraps, so that the protection of the galvanized layer of the steel strand in the twisting link is enhanced, and the twisted galvanized layer of the steel strand is intact.
Taking the galvanized grade of 1 multiplied by 7 to phi 15.2mm and the grade of 2160MPa as an example, the inspection test data of the finished steel strand are shown in the table 9:
TABLE 9
-layer winding; when the layer twines, can twine different colours as required for when urban bridge establishes or other constructions, increase the aesthetic feeling.
Further, the air-fuel ratio of the preheating section, the heating section and the soaking section is α1Respectively 125, 95 and 85, the furnace temperature is 965 ℃, 955 ℃ and 945 ℃, the lead temperature is 550 +/-5 ℃, and the linear speed is 3.5 m/min.
Further, the drawing is carried out by 9-pass continuous drawing, the cooling mode is water cooling and narrow-slit air cooling of the tank body, the drawing speed V is 2.5-3.0m/sec, and the linear temperature does not exceed the critical temperature of 70-80 ℃ in the steel wire drawing process.
Further, in hot galvanizing, zinc temperature: 460 ℃ and 465 ℃; and (3) galvanizing vehicle speed: v25 m/min, EMW electromagnetic current: i is0#＝270A。
Further, at the time of finishing, the linear velocity V was 1.5 m/s.
Further, in the twisting and stabilizing treatment, the heating temperature: 380 ℃, set tension: 124kN, twisting speed: 40-50m/min, lay length: 215 mm.
The hot galvanizing prestress steel strand produced by the process takes the zinc plating-2160 MPa grade of 1 multiplied by 7-phi 15.2mm as an example, and the tensile strength is more than or equal to 2160 MPa; the maximum force total elongation is more than or equal to 4.5 percent; the 385MPa periodic load is applied in the axial fatigue test, and the fracture is not generated for 200 ten thousand times.
In conclusion, the hot-dip galvanized prestressed steel strand produced by the production method provided by the application has low cost and high tensile strength, can be used for cables, anchoring tension members, tension members for lifting and fixing and other members in civil engineering of bridges, can save a large amount of bridge construction materials, shorten the construction time, ensure the stability of engineering quality, has higher corrosion resistance and better fatigue resistance, can greatly improve the service life of the members such as the cables and the like, has remarkable economic and social benefits, and can increase the aesthetic feeling when being used for urban bridge construction due to the beautiful color coated on the appearance.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The production method of the 2160MPa high-strength galvanized steel strand for the stay cable is characterized by comprising the following process steps:
-selecting a material; the raw material is a wire rod, the carbon content fraction of the raw material and the microalloying of the raw material are improved, and the P, S, Cu element content in the wire rod is strictly controlled.
-heat treatment of the wire rod; firstly, a wire rod enters a heating furnace to be heated through a preheating section, a heating section and a soaking section to obtain austenitic steel, and then enters a lead pot to be cooled to obtain sorbite;
-acid washing, phosphating;
-drawing; adopting active stirring lubrication and rotary cooling die combination for multi-pass drawing, namely a small-angle and long die core wire-drawing die, wherein the working taper angle of the wire-drawing die is as follows: 8-10 degrees, length of mold core: 28-35 mm; a multi-group electrolytic alkali washing and acid washing combined plating pretreatment;
-hot galvanizing; the method adopts the EMW electromagnetic induction wiping technology in New Zealand, and the zinc feeding amount is controlled to be 220-260g/m 2;
-finishing the surface;
twisting and stabilizing treatment;
-layer winding.
2. The method for producing 2160MPa high-strength galvanized steel strand for stay cable according to claim 1, wherein the air-fuel ratio of preheating section, heating section and soaking section is α1125, 95 and 85 respectively, and the furnace temperature is 965℃,955 ℃, 945 ℃, lead temperature is 550 +/-5 ℃, and linear speed is 3.5 m/min.
3. The method for producing 2160MPa high strength galvanized steel strand for stayed cable according to claim 1, characterized in that the drawing is performed by 9 times of continuous drawing, the cooling mode is water cooling and narrow slit air cooling of the tank body, the drawing speed V is 2.5-3.0m/sec, and the wire temperature does not exceed the critical temperature of 70-80 ℃ during the drawing of the steel wire.
4. The method for producing 2160MPa high-strength galvanized steel strand for stay cable according to claim 1, wherein the zinc temperature during hot galvanizing is as follows: 460 ℃ and 465 ℃; and (3) galvanizing vehicle speed: v25 m/min, EMW electromagnetic current: i is0#＝270A。
5. The method of claim 1, wherein the finishing process has a wire speed of 1.5 m/s.
6. The method for producing 2160MPa high-strength galvanized steel strand for stay cable according to claim 1, wherein the heating temperature during twisting and stabilizing treatment is: 380 ℃, set tension: 124kN, twisting speed: 40-50m/min, lay length: 215 mm.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111826584A (en) * | 2020-04-28 | 2020-10-27 | 全球能源互联网研究院有限公司 | Core wire for overhead conductor and preparation method thereof |
| CN111962318A (en) * | 2020-08-21 | 2020-11-20 | 南通市华星钢丝制品有限公司 | Production method of steel wire for ultra-high-speed elevator |
| CN112935716A (en) * | 2021-01-29 | 2021-06-11 | 宿迁市邦德金属制品有限公司 | Method for machining double-faced hammering inhaul cable |
| CN113026402A (en) * | 2020-12-23 | 2021-06-25 | 天津市新天钢中兴盛达有限公司 | Large-sized hot-dip galvanized prestressed steel strand and manufacturing method thereof |
| CN114350913A (en) * | 2021-12-27 | 2022-04-15 | 江苏省沙钢钢铁研究院有限公司 | Steel strand stabilizing treatment process and treated steel strand |
| CN115109993A (en) * | 2021-03-22 | 2022-09-27 | 东台市展新不锈钢紧固件制造有限公司 | Diamond anti-theft net wire for high-purity chromium-manganese special alloy material and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111826584A (en) * | 2020-04-28 | 2020-10-27 | 全球能源互联网研究院有限公司 | Core wire for overhead conductor and preparation method thereof |
| CN111962318A (en) * | 2020-08-21 | 2020-11-20 | 南通市华星钢丝制品有限公司 | Production method of steel wire for ultra-high-speed elevator |
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| CN113026402A (en) * | 2020-12-23 | 2021-06-25 | 天津市新天钢中兴盛达有限公司 | Large-sized hot-dip galvanized prestressed steel strand and manufacturing method thereof |
| CN113026402B (en) * | 2020-12-23 | 2022-10-11 | 天津市新天钢中兴盛达有限公司 | Large-sized hot-dip galvanized prestressed steel strand and manufacturing method thereof |
| CN112935716A (en) * | 2021-01-29 | 2021-06-11 | 宿迁市邦德金属制品有限公司 | Method for machining double-faced hammering inhaul cable |
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| CN114350913A (en) * | 2021-12-27 | 2022-04-15 | 江苏省沙钢钢铁研究院有限公司 | Steel strand stabilizing treatment process and treated steel strand |
| CN116460164A (en) * | 2023-05-06 | 2023-07-21 | 无锡市时捷钢绳有限公司 | Low-loss long-service-life steel wire rope and processing technology thereof |
| CN116460164B (en) * | 2023-05-06 | 2024-04-19 | 无锡市时捷钢绳有限公司 | Low-loss long-service-life steel wire rope and processing technology thereof |
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