CN102688906A - Production process of extra-high strength steel stranded wire for long-span transmission wire - Google Patents
Production process of extra-high strength steel stranded wire for long-span transmission wire Download PDFInfo
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Abstract
The invention relates to a production process of steel stranded wires, and in particular relates to a production process of an extra-high strength steel stranded wire for a long-span transmission wire. A raw material with a diameter of theta9.0mm and a steel grade of 82B is utilized to produce a 37-strand hot galvanizing steel stranded wire with a total diameter of 20.16mm and a single-wire diameter of 2.88mm for the long-span transmission wire. The production process comprises the following steps of: (1) coiling the raw material, carrying out surface treatment, and drawing a high carbon steel wire rod of theta9.0mm to theta8.5mm; (2) carrying out heat treatment, acid-washing, phosphating, and surface treatment on a wire rod; (3) drawing a finished product: carrying out 13-pass drawing processing by using a high-power and multi-pass LT-11/650 type water tank wire-drawing machine, wherein a compression ratio is 12-18.6%; (4) inspecting, putting online, hot galvanizing, and winding by using a spool; and (5) inspecting, and twisting. The production process of the steel stranded wire is simple in realization mode, and all indexes of the produced extra-high strength hot galvanizing steel stranded wire meet the technical requirements of long-span projects.
Description
Technical field
The present invention relates to a kind of steel strand wires production technology, particularly relate to the production technology of a kind of big leap transmission pressure with the Extra High Strength steel strand wires.
Background technology
On big span line; Be own wt and the complex natural environment of resisting speciality, must improve the stretching resistance of lead, just can reach best pulling force weight ratio combined effect; Through improving tensile strength, just can accomplish the dual purpose that not only improves stretching resistance but also reduce own wt.So-called big the leap as the term suggests be exactly to need to cross over big span, crossed over big river, high mountain etc. often, and speciality is extra heavy to be its characteristic.Must adopt the Extra High Strength steel strand wires for big span line, tensile strength >=1910MPa, stranded back tensile strength >=1815MPa before zinc-coated wire is stranded.For example, in January, 2011, transmission line of electricity is crossed over for first of building on the stream-Amazon River of long river, the world by Brazil, and steel wire tensile strength is greater than 1910Mpa in the engine request hot dip galvanizing steel strand, and 1% stress value when extending is the industry new peak greater than 1670Mpa.
In the production process of steel strand wires, routine is 7 bursts of structures, and 19 strands are the multiply structure; And 37 bursts of production difficulty can be difficult more, but big the leap to improving the stretching resistance of lead, the sectional area of raising steel strand wires; 7 strands, 19 bursts structures can't satisfy, must adopt 37 strands of labyrinth products.Cross in the transmission line of electricity tendering process in January, 2011 Brazil Amazon River, my company closely cooperates with Hangzhou Cable Co., Ltd., has obtained the Brazilian big span line supply of material and has weighed.It is 4305 meters, 4355 meters two kinds that this project requires delivery length, and steel strand wires single-piece weight is about 8500kg.The big lead of crossing over of this batch adopts 37 gangs of overall diameter 20.16mm, filament diameter 2.88mm hot dip galvanizing steel strand.
We can obviously find out with steel strand wires and this engineering Extra High Strength steel strand wires technical conditions (same steel linear diameter 2.88mm) through the domestic conventional steel-cored aluminium strand of tabulation 1 contrast; Each item standard of this engine request is all apparently higher than the conventional products requirement; And high the EST level product requirement that numerous domestic steel strand wires producer can not capture occurs, add complicated 37 strands and the extra heavy terms of delivery of speciality and make numerous should hanging back the side of marking.
The Extra High Strength hot dip galvanizing steel strand is to produce the big critical material of crossing over lead, domesticly for a long time can not get effective solution, can only be from external import, thus seriously restricted the production of such lead.
Tabulation 1: different intensity scale galvanized steel wire technical conditions
Table is annotated: D → single steel wire diameter.
Summary of the invention
The present invention is directed to the prior art deficiency, propose a kind of big leap transmission pressure and use the extra-high tensile steel strand production process, Extra High Strength hot dip galvanizing steel strand each item index outstanding engineering conditional request all far away of production.
The technical scheme that the present invention adopted:
A kind of big leap transmission pressure is used the extra-high tensile steel strand production process; Adopt the raw material of diameter ￠ 9.0mm, 82B grade of steel; Produce the big hot dip galvanizing steel strand of crossing over transmission pressure with 37 gangs of overall diameter 20.16mm, filament diameter 2.88mm, its technical process is following:
1) with behind the raw material wire rod, at first wire rod is carried out surface treatment, select for use ￠ 9.0mm high-carbon wire rod to pull to ￠ 8.5mm then,, adopt deep bid ghost image nose formula admission machine for reducing the soldering tip before end product drawing is got on the bus;
2) heat-treat, carry out pickling, phosphatization once more, wire rod is carried out surface treatment;
3) end product drawing: adopt the LT-11/650 type water tank drawbench of high-power multi-pass to carry out drawing processing, compression ratio is 12～18.6%, and drawing process is following:
First passes of drawing: reach diameter 8.5mm, compression ratio 10.81%;
Second passes of drawing: reach diameter 8.18mm, compression ratio 7.37%;
The 3rd passes of drawing: reach diameter 7.38mm, compression ratio 18.60%;
Four-pass drawing: reach diameter 6.67mm, compression ratio 18.31%;
The 5th passes of drawing: reach diameter 6.03mm, compression ratio 18.26%;
The 6th passes of drawing: reach diameter 5.45mm, compression ratio 18.29%;
The 7th passes of drawing: reach diameter 4.92mm, compression ratio 18.49%;
The 8th passes of drawing: reach diameter 4.45mm, compression ratio 18.18%;
The 9th passes of drawing: reach diameter 4.03mm, compression ratio 17.98%;
The tenth passes of drawing: reach diameter 3.65mm, compression ratio 17.97%;
The tenth a time drawing: reach diameter 3.32mm, compression ratio 17.26%;
The 12 passes of drawing: reach diameter 3.04mm, compression ratio 16.15%;
The 13 passes of drawing: reach diameter 2.82mm, compression ratio 13.93%;
4) check, reach the standard grade, the I-beam wheel take-up is adopted in galvanizing;
5) system is twisted with the fingers in check.
Described big leap transmission pressure is used the extra-high tensile steel strand production process, and the wire surface handling process comprises pickling, phosphatization processing; Employing concentration is 15%～20% hydrochloric acid, at ambient temperature wire rod is carried out pickling, and the pickling time is 8～12min; Ferrous ion concentration is controlled at≤200g/L in the hydrochloric acid; The phosphatization treatment temperature is controlled at 50～70 ° of C, and phosphating time is 10～15min, control phosphating coat thickness≤11 microns.
Described big leap transmission pressure is used the extra-high tensile steel strand production process; In the drawing process; Through the method for taking to strengthen the cone pulley diameter, reducing drawing speed,, strengthen the cone pulley diameter to 678-878mm to guarantee that toughness index does not reduce under the big compression ratio situation; The control drawing speed is at 2.5 meter per seconds～3.5 meter per seconds, to guarantee that the toughness number of torsions does not reduce under major diameter steel wire, big compression ratio, the Extra High Strength situation.
Described big leap transmission pressure is used the extra-high tensile steel strand production process; In the sth. made by twisting system process, change the pipe twisting machine wire-crossing wheel into rotary type, to reduce stressed in the steel wire strand system process; Be the glacing flatness of guaranteeing that steel strand wires are good, the traction wheel diameter that adopts pipe twisting machine is between 1.5m～1.8m.
Described big leap transmission pressure is used the extra-high tensile steel strand production process, in the hot galvanizing process, adopts the galvanizing time of reduction steel wire and the method for temperature parameter; To improve Mechanical Properties of Steel Wire; Galvanizing time 8～15 seconds soaks the zinc temperature and is controlled at 450～455 ℃, and the molten zinc amount of employing is at 50～60 tons zinc pot; Avoid cold steel wire to get into the temperature fluctuation that causes behind the zinc pot, to guarantee good quality of coating.
Beneficial effect of the present invention:
1, the big leap transmission pressure of the present invention is with the production technology of Extra High Strength steel strand wires, and implementation is simple, and Extra High Strength hot dip galvanizing steel strand each item index of production satisfies big overhead crossing engineering specification requirement fully.Company is 23,4305 meters that Hangzhou Cable Co., Ltd. produces, 37 gangs of overall diameter 20.16mm of 1,4355 meters Extra High Strengths filament diameter 2.88mm hot dip galvanizing steel strand, each item index outstanding engineering conditional request all far away.Adopt Extra High Strength hot dip galvanizing steel strand each item index of this explained hereafter to detect data as tabulating 2:
Table 2: Extra High Strength hot dip galvanizing steel strand each item index detects data
Table is annotated: D → single steel wire diameter.
Can find out through above data, Extra High Strength hot dip galvanizing steel strand each item index outstanding engineering conditional request all far away that my company produces, and the termination is not loose, the seamless surface crack.
2, the big leap transmission pressure of the present invention makes the level of production of my company's hot dip galvanizing steel strand and ability go up a new step again with the production technology of Extra High Strength steel strand wires, has also satisfied the production needs of state inner cable enterprise.On the basis of original production Extra High Strength G3A product, tackle key problems in a large number; From raw material select, technology adjustment, equipment are perfect etc., and many-side has been carried out extensive work; Ton surplus more than 30 kind of output 2000 of production EST level product; Supplied the use of domestic and international more than 20 tame cable factories and satisfied the in short supply of market, also very big impetus has been played in the technological progress of my company and the raising of product quality simultaneously.
The specific embodiment
Embodiment one: the present invention is big, and the leap transmission pressure is used the extra-high tensile steel strand production process; Adopt the raw material of diameter ￠ 9.0mm, 82B grade of steel; Produce the big hot dip galvanizing steel strand of crossing over transmission pressure with 37 gangs of overall diameter 20.16mm, filament diameter 2.88mm, its technical process is following:
1) with behind the raw material wire rod, at first wire rod is carried out surface treatment, select for use ￠ 9.0mm high-carbon wire rod to pull to ￠ 8.5mm then,, adopt deep bid ghost image nose formula admission machine for reducing the soldering tip before end product drawing is got on the bus;
2) heat-treat, carry out pickling, phosphatization once more, wire rod is carried out surface treatment;
3) end product drawing: adopt the LT-11/650 type water tank drawbench of high-power multi-pass to carry out drawing processing, compression ratio is 12～18.6%, and drawing process is following:
First passes of drawing: reach diameter 8.5mm, compression ratio 10.81%;
Second passes of drawing: reach diameter 8.18mm, compression ratio 7.37%;
The 3rd passes of drawing: reach diameter 7.38mm, compression ratio 18.60%;
Four-pass drawing: reach diameter 6.67mm, compression ratio 18.31%;
The 5th passes of drawing: reach diameter 6.03mm, compression ratio 18.26%;
The 6th passes of drawing: reach diameter 5.45mm, compression ratio 18.29%;
The 7th passes of drawing: reach diameter 4.92mm, compression ratio 18.49%;
The 8th passes of drawing: reach diameter 4.45mm, compression ratio 18.18%;
The 9th passes of drawing: reach diameter 4.03mm, compression ratio 17.98%;
The tenth passes of drawing: reach diameter 3.65mm, compression ratio 17.97%;
The tenth a time drawing: reach diameter 3.32mm, compression ratio 17.26%;
The 12 passes of drawing: reach diameter 3.04mm, compression ratio 16.15%;
The 13 passes of drawing: reach diameter 2.82mm, compression ratio 13.93%;
4) check, reach the standard grade, the I-beam wheel take-up is adopted in galvanizing;
5) system is twisted with the fingers in check.
Embodiment two: the big leap transmission pressure of present embodiment is used the extra-high tensile steel strand production process; Different with embodiment one is: in the wire surface processing procedure; Pickling, phosphatization are handled the following method that adopts: acidization employing concentration is 15%～20% hydrochloric acid; At ambient temperature wire rod is carried out pickling, the pickling time is 8～12min, and ferrous ion concentration is controlled at≤200g/L in the hydrochloric acid; In the phosphatization processing procedure, temperature is controlled at 50～70 ° of C, and phosphating time is 10～15min, control phosphating coat thickness≤11 microns.
Embodiment three: the big leap transmission pressure of present embodiment is used the extra-high tensile steel strand production process; Take following measure in the drawing process: through the method for taking to strengthen the cone pulley diameter, reducing drawing speed; To guarantee that toughness index does not reduce under the big compression ratio situation; Strengthen the cone pulley diameter to 678-878mm, the control drawing speed is at 2.5 meter per seconds～3.5 meter per seconds.
The present invention is big, and the leap transmission pressure is used the extra-high tensile steel strand production process; In the sth. made by twisting system process, change the pipe twisting machine wire-crossing wheel into rotary type, to reduce stressed in the steel wire strand system process; Be the glacing flatness of guaranteeing that steel strand wires are good, the traction wheel diameter that adopts pipe twisting machine is between 1.5m～1.8m.
In the hot galvanizing process; Adopt the galvanizing time of reduction steel wire and the method for temperature parameter, to improve Mechanical Properties of Steel Wire, galvanizing time 2.5～3.5 seconds; Soak the zinc temperature and be controlled at 450～455 ℃; And the molten zinc amount of employing avoids cold steel wire to get into the temperature fluctuation that causes behind the zinc pot, to guarantee good quality of coating at 50～60 tons zinc pot.
Claims (5)
1. one kind big leap transmission pressure is used the extra-high tensile steel strand production process, adopts the raw material of diameter ￠ 9.0mm, 82B grade of steel, produces the big hot dip galvanizing steel strand of crossing over transmission pressure with 37 gangs of overall diameter 20.16mm, filament diameter 2.88mm, it is characterized in that:
1) with behind the raw material wire rod, at first wire rod is carried out surface treatment, select for use ￠ 9.0mm high-carbon wire rod to pull to ￠ 8.5mm then,, adopt deep bid ghost image nose formula admission machine for reducing the soldering tip before end product drawing is got on the bus;
2) heat-treat, carry out pickling, phosphatization once more, wire rod is carried out surface treatment;
3) end product drawing: adopt the LT-11/650 type water tank drawbench of high-power multi-pass to carry out drawing processing, compression ratio is 12～18.6%, and drawing process is following:
First passes of drawing: reach diameter 8.5mm, compression ratio 10.81%;
Second passes of drawing: reach diameter 8.18mm, compression ratio 7.37%;
The 3rd passes of drawing: reach diameter 7.38mm, compression ratio 18.60%;
Four-pass drawing: reach diameter 6.67mm, compression ratio 18.31%;
The 5th passes of drawing: reach diameter 6.03mm, compression ratio 18.26%;
The 6th passes of drawing: reach diameter 5.45mm, compression ratio 18.29%;
The 7th passes of drawing: reach diameter 4.92mm, compression ratio 18.49%;
The 8th passes of drawing: reach diameter 4.45mm, compression ratio 18.18%;
The 9th passes of drawing: reach diameter 4.03mm, compression ratio 17.98%;
The tenth passes of drawing: reach diameter 3.65mm, compression ratio 17.97%;
The tenth a time drawing: reach diameter 3.32mm, compression ratio 17.26%;
The 12 passes of drawing: reach diameter 3.04mm, compression ratio 16.15%;
The 13 passes of drawing: reach diameter 2.82mm, compression ratio 13.93%;
4) check, reach the standard grade, the I-beam wheel take-up is adopted in galvanizing;
5) system is twisted with the fingers in check.
2. big leap transmission pressure according to claim 1 is used the extra-high tensile steel strand production process, it is characterized in that: the wire surface handling process comprises pickling, phosphatization processing; Employing concentration is 15%～20% hydrochloric acid, at ambient temperature wire rod is carried out pickling, and the pickling time is 8～12min; Ferrous ion concentration is controlled at≤200g/L in the hydrochloric acid; The phosphatization treatment temperature is controlled at 50～70 ° of C, and phosphating time is 10～15min, control phosphating coat thickness≤11 microns.
3. big leap transmission pressure according to claim 1 and 2 is used the extra-high tensile steel strand production process; It is characterized in that: in the drawing process; Through the method for taking to strengthen the cone pulley diameter, reducing drawing speed; To guarantee that toughness index does not reduce under the big compression ratio situation, strengthen the cone pulley diameter to 678-878mm, the control drawing speed is at 2.5 meter per seconds～3.5 meter per seconds.
4. big leap transmission pressure according to claim 3 is used the extra-high tensile steel strand production process; It is characterized in that: twist with the fingers in the system process; Change the pipe twisting machine wire-crossing wheel into rotary type; To reduce stressed in the steel wire strand system process, be the glacing flatness of guaranteeing that steel strand wires are good, the traction wheel diameter that adopts pipe twisting machine is between 1.5m～1.8m.
5. big leap transmission pressure according to claim 3 is used the extra-high tensile steel strand production process, it is characterized in that: in the hot galvanizing process, adopt the galvanizing time of reduction steel wire and the method for temperature parameter; To improve Mechanical Properties of Steel Wire; Galvanizing time 8～15 seconds soaks the zinc temperature and is controlled at 450～455 ℃, and the molten zinc amount of employing is at 50～60 tons zinc pot; Avoid cold steel wire to get into the temperature fluctuation that causes behind the zinc pot, to guarantee good quality of coating.
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