CN1139760A - Making tech. galvanized round highc arbon steel wire for optical cable reinforcing and equipment - Google Patents
Making tech. galvanized round highc arbon steel wire for optical cable reinforcing and equipment Download PDFInfo
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- CN1139760A CN1139760A CN 95111200 CN95111200A CN1139760A CN 1139760 A CN1139760 A CN 1139760A CN 95111200 CN95111200 CN 95111200 CN 95111200 A CN95111200 A CN 95111200A CN 1139760 A CN1139760 A CN 1139760A
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Abstract
The present invention relates to a process for manufacturing galvanized high-carbon steel wire for strengthening optical cable and its manufacturing equipment, belonging to the field of wire processing and treating technology. It is characterized by that its technological process includes: heat treatment of primary drawn wire, galvanizing, secondary drawing, passing through magnetic induction sizing device, straightening, winding displacement and wire taking-up. Its equipment installation includes secondary drawing machine, magnetic induction sizing device, stress-relieving device, winding wheel device and H-shaped wheel wire taking-up machine. Said invention uses high-carbon steel as skeleton material for optical cable.
Description
The invention relates to a manufacturing process and equipment for a galvanized round high-carbon steel wire for reinforcing an optical cable, which are used for drawing the high-carbon steel wire and belong to the field of wire processing or treatment.
In light optical cables such as central tube type communication optical cables, especially in main optical cable products, more and more manufacturers adopt steel wires to replace steel strands as framework materials in optical fiber cables. The stainless steel wire is generally adopted at foreign countries by 1Cr18Ni9Ti, and the domestic Shizushan steel works adopt low-carbon galvanized steel wires which are firstly drawn and then galvanized.
The disadvantages of the prior art are that: 1. the stainless steel wire has high cost; 2. the low-carbon steel wire has low strength, low load resistance and short service life; 3. firstly, wire drawing and then galvanizing are carried out, and stress is concentrated; 4. the wire surface finish is poor.
The invention aims to overcome the defects of the background technology and provides a manufacturing process and equipment of a galvanized round high-carbon steel wire for optical cable reinforcement, the manufacturing process and equipment can be used for producing the galvanized round high-carbon steel wire with the carbon content of 0.60-0.82% (percentage content) which is used as a framework material of an optical fiber and an optical cable, the high-carbon steel wire has high surface smoothness, can meet various mechanical indexes of the optical cable framework, and has long service life and long length of a through strip.
The invention is realized by the following steps: the manufacturing process flow of the galvanized round high-carbon steel wire for reinforcing the optical cable is to draw the high-carbon steel wire (1) with the carbon content of 0.60-0.82% (percentage content) to phi 1.5-3.5 mm- → the steel wire after drawing is subjected to heat treatment (2) → electrogalvanizing (3) → secondary drawing (4) and then is subjected to magnetic induction exhaust device (5) → deformation straightening (6) → flat cable (7) → take-up (8).
The equipment device for manufacturing the galvanized round high-carbon steel wire for reinforcing the optical cable is a wire drawing machine → a heat treatment groove → an electroplating groove → a secondary wire drawing machine (4 ') - → a magnetic induction sizing device (5) - → a stress eliminator (6') - → a wire discharging wheel device (7 ') ->a spool take-up machine (8').
The steel wire with diameter phi of 0.60-3.0mm is drawn from high carbon steel with material quality of 0.60-0.82% (percentage content), and can meet various mechanical indexes of optical cable framework. Tensile strength 1570-1970, torsion is more than or equal to 30, permanent elongation is less than or equal to 0.1 percent, and Young's modulus (E) is more than or equal to 190 (Gpa).
A manufacturing process of a galvanized round high-carbon steel wire for optical cable reinforcement is characterized in that a steel wire (1) subjected to primary drawing is subjected to heat treatment (2) → electrogalvanizing (3) → secondary drawing (4), and then is subjected to magnetic induction sizing device (5) → deformation straightening (6) → flat cable (7) → take-up (8).
The heat treatment (2) method is determined by the final diameter of the finished product, the steel wire (1) with the diameter phi of 0.6-2.0mm is drawn, and the heat treatment (2) process is quenching treatment after austenitizing; drawing the finished steel wire (1) with the diameter phi of 2.1-3.0mm, wherein the heat treatment (2) is lead tempering treatment.
Drawing finished steel wire of 0.6-2.0mm, adopting austenitizing and then patenting treatment as heat treatment, when high-carbon steel wire is drawn to 1.5-3.5mm for the first time, its cold working state is deformed sorbite, heating to 960 deg.C and minus, and changing it into austenite, patenting (520 deg.C) and then electrogalvanizing by conventional process.
Drawing finished product phi 2.1-3.0 steel wire, adopting lead tempering treatment, tempering and recrystallizing to obtain tempered sorbite, then electrogalvanizing by conventional process.
And (4) carrying out secondary drawing on the steel wire subjected to electro-galvanizing to reach the diameter of a required finished product.
The steel wire is drawn after galvanization, so that the surface of a finished product is not sunken, the surface of a finished steel wire is smooth, stress concentration is avoided, destructive factors are eliminated, and the service life of the steel wire is prolonged.
The secondary drawing (4) can be performed by two methods, namely water tank drawing or dry drawing, which is mainly determined by factory equipment. And in the drawing of the water tank wire drawing machine, because grease lubricating oil is adopted, the residual liquid on the surface of the steel wire is extremely trace, and the secondary drawing (4) adopts a conventional process and does not need special treatment. When the secondary drawing (4) is used for the wire drawing machine (4'), sodium soap powder is used as lubricating powder, more residual sodium soap powder is left on the surface of the steel wire, and in order to ensure that the residual lubricating powder on the surface of the finished steel wire reaches the minimum value, when the secondary drawing (4) of the steel wire (1) is dry drawing, the steel wire (1) needs to pass through a double-set die device (9) when the last two procedures of drawing the diameter of the finished steel wire are achieved. . Because the last two drawing processes do not have lubricating powder, the steel wire only uses the sodium soap powder remained on the surface of the steel wire in the previous drawing process as the lubricating agent, thereby ensuring that the lubricating film on the surface of the steel wire is in the thinnest state and the surface of the steel wire is smooth and clean.
The purpose of magnetic induction sizing enables the length of the high-carbon steel wire to accurately meet the requirements of users.
The function of the deformation straightening (6) is that when the drawn steel wire is in a natural state of a ring shape, after the steel wire passes through the stress eliminator (6 '), the steel wire is repeatedly bent between rollers of the stress eliminator (6'), the longitudinal and transverse deformation is alternately carried out, the residual stress of the steel wire is eliminated, and the steel wire is uniform, straight and linear. The deformation parameters depend on the tensile strength and the diameter of the steel wire.
The straightened steel wire passes through a wire arranging (7) and is wound up (8) by a spool wire winding machine.
The equipment device of the manufacturing process of the galvanized round high-carbon steel wire for optical cable reinforcement comprises the following equipment devices in sequence according to the process flow: the dry wire drawing machine → the heat treatment groove → the electroplating groove → the secondary wire drawing machine (4 ') → the magnetic induction sizing device (5) → the stress eliminator (6'), -the wire discharging wheel device (7 ') → the spool take-up machine (8').
The secondary wire drawing machine (4') may be a water tank wire drawing machine or a dry wire drawing machine depending onthe plant equipment, and the water tank wire drawing machine is a general-purpose equipment. When the secondary drawing is used in the wire drawing machine, the used double-die device consists of two groups of die boxes (10), die sleeves (11) and a wire drawing die (12), wherein the middle part of each die box (10) is provided with a partition plate (20), and the distance (S) between the two die boxes is 200 mm and 400 mm. FIG. 1 is a structural view of a double-die-set device, wherein a partition plate (20) in the middle of each die box divides the die box into two parts, one part is an empty die box, the other part is provided with a die sleeve (11) and a die core (12), and circulating cooling water is introduced for cooling the die core and the die sleeve. When the finished steel wire is subjected to the last two drawing processes of drawing by the dry-type wire drawing machine, the surface of the finished steel wire is ensured to be in a smooth state due to the absence of lubricating powder after the steel wire passes through the double die devices, and the lubricating film is reduced to be in the thinnest state. Through the double die-sleeving device (9), the original process of drawing once is difficult to implement due to too large steel wire compression ratio, drawing can be performed by two processes through reducing the compression ratio, and a wire-drawing winding drum is not added, so that equipment investment can be reduced, and energy consumption can be reduced.
FIG. 2 is a diagram of a magnetic induction sizing wheel device, wherein the magnetic induction sizing device (5) consists of a central shaft (17), a rotary sizing wheel (13), magnets (14, 14 '), a sizing display screen (15) and a support plate (16), the magnet (14) on the side surface of the rotary sizing wheel (13) corresponds to the magnet (14 ') fixed on the support plate (16), and the magnet (14 ') is connected with the sizing display screen. The magnet (14') is connected to the fixed-size display screen (15) via a signal transmission line. The wheel surface of the rotary sizing wheel (13) is provided with a circle of grooves to ensure that the steel wire passes through the rotary sizing wheel (13) in a directional manner, when the steel wire (1) moves forwards, the rotary sizing wheel (13) is driven to rotate by friction, when the steel wire rotates for one circle, S, N-pole induction is generated between the magnet (14) and the magnet (14'), induction signals are fed back to a sizing display screen device (15) through a signal transmission line, and the rotation times are displayed on the display screen; the number of revolutions of the rotary sizing wheel can be determined in advance according to the required length, when the steel wire wound by the take-up spool (8') reaches the specified size, the wire drawing machine stops working, and the rotary sizing wheel (13) also stops working immediately.
Fig. 3 is a view showing a stress relief structure for straightening a steel wire by a stress relief (patent No. 91230506.1) to relieve stress and thereby ensure the straightness of the steel wire.
FIG. 4 is a diagram showing the direction from a steel wire to an I-shaped wheel take-up machine through a wire arranging wheel, FIG. 5 is a structure diagram of a wire arranging wheel device, the wire arranging wheel device (7') is fixed on a connecting plate (19) through 2-5 wire arranging wheels (10), the curvature radius R of the central track of a wire arranging wheel set is 200-380mm, and the groove radius R of the wire arranging wheel is 3.5-6.5 mm.
As shown in the figures 4 and 5, the steel wire (1) is wound on the spool through the 2-5 small wire arranging wheels (18), the contact between the steel wire and each wire arranging wheel is point contact, so that the straightened steel wire is prevented from deforming, and the steel wire wound on the spool wire winding machine is kept in a linear state.
Fig. 6 is a structure diagram of a wire arranging wheel, which is a cross section view from A to A in fig. 5 and is a schematic structural diagram of a single wire arranging wheel, the radius r of a groove of the wire arranging wheel is 3.5-6.5mm, so that finished steel wires can slide in the groove, the wire arranging wheel (18) is fixed on a connecting plate (19) through a bolt, and the connecting plate (19) is arranged on a wire arranging rod, so that the connecting plate can move uniformly when in wire arrangement.
The spool take-up machine (8 ') generally uses an 800-type cable wire C-coiling spool and a 500-type I-shaped spool, has large loading capacity, ensures the length of an optical cable, utilizes the production advantages of large-coil heavy line production to realize that the spool winds the whole coil of the optical cable wire without joints, for example, the finished product phi 1.0mm optical cable wire can realize 21km without joints, and the spool take-up machine (8') is simple and easy to replace in the production process.
The invention is characterized in that: in the manufacturing process, different heat treatment methods are adopted for steel wires with different finished product diameters, and the processes of wire drawing, galvanizing and wire drawing are adopted; and various technical performances of the high-carbon steel wire finished product are ensured by adopting equipment such as a double-die-set device, a wire arrangement wheel device and the like.
Compared with the background technology, the invention has the advantages that:
1, the process flow is reasonable, and the equipment can ensure that each process index in the wire drawing process reaches an optimal value;
2 the zinc layer on the surface of the product is good in state and high in flatness;
3, high-carbon steel can be used as the optical cable skeleton material, and various mechanical indexes are ensured.
FIG. 1 double die set
FIG. 2 magnetic induction sizing wheel device
FIG. 3 is a structural view of a stress relief
FIG. 4 is a drawing of a steel wire passing through a wire arranging wheel to a spool
FIG. 5 structure diagram of wire arranging wheel device
FIG. 6 structure diagram of wire arranging wheel
The invention will be further elucidated with reference to the preferred embodiments:
1 is a manufacturing process and equipment for galvanized round high-carbon steel wire for reinforcing optical cable, wherein the drawing finished product of A3 steel with the material carbon content of 0.65% is phi 1.6 mm.
a.∮6.5mm—→∮3.0mm
6/560 shows that 6 is drawing 6 passes, 560 is the diameter of each roll 560mm, the roll speed 180(m/min), the diameter change of the steel wire of six passes and the pressure processing deformation of each pass are:
∮6.5—→∮5.7/23.10—→∮4.9/26.10—→∮4.3/23.00—→∮3.8/21.90—→∮3.35/22.28—→∮3.0/19.80
the average compressibility was 22.72%
b.∮3.0mm—→∮3.0mm
Patenting after austenitizing: heating voltage 38(V), heating distance 2(m)
The austenite temperature is 960 (DEG C), the patenting temperature is 500 (DEG C),
electrogalvanizing: plating voltage 4(V), plating current 190 (A/each)
Current density 9.17 (A/dm)2) Plating speed 10(m/min)
The electrogalvanizing layer is more than or equal to 50 (g/m)2)
c.∮3.0mm—→∮1.6mm
∮3.0—→∮2.7/19—→∮2.4/20.99—→∮2.1/23.43—→∮1.85/22.39—→∮1.70/15.56—→∮1.60/11.42
The last two drawing passes phi 1.70/15.56, 1.60/11.42 are passed through a double die. The speed of the winding drum is 250m/min, and the sodium soap powder is used for the dry wire drawing lubricating powder.
d. When the finished product reaches 1.60 mm- → a magnetic induction sizing device, the length of the sizing is 21000 m/disc- → a deformation straightener- → a flat cable → 800 type cable C disc spool.
2 the manufacturing process and equipment of the galvanized round high-carbon steel wire for reinforcing the optical cable, which is phi 2.5mm in the drawing finished product of A3 steel with the material carbon content of 0.70 percent, are taken as examples:
a.∮6.5mm—→∮3.0mm
6/560 shows 6 for drawing 6 passes, 560 for each roll diameter of 560mm, six passes of wire diameter change at roll speed 180(m/min) and the amount of work deformation per pass of press:
∮6.5—→∮5.7/23.10—→∮4.9/26.10—→∮4.3/23.00—→∮3.8/21.90—→∮3.35/22.28—→∮3.0/19.80
the average compressibility was 22.72%
b.∮3.0mm—→∮3.0mm
Tempering and sorbitizing: the medium temperature of the lead bath is 480 DEG C
Electrogalvanizing: plating voltage 4(V), plating current 190 (A/each)
Current density 9.17 (A/dm)2) Plating speed 10(m/min)
The electrogalvanizing layer is more than or equal to 50 (g/m)2)
c.∮3.0mm—→∮2.5mm
∮3.0—→∮2.8/12.89—→∮2.6/13.28—→∮2.5/7.54
The speed of the winding drum is 200m/min, the fixed length is 6600 m/disc, and the spool 800 type cable wire C disc
The water tank lubricating liquid is grease lubricating liquid with the concentration of 70 percent and the PH value of 10
3, taking a manufacturing process and an equipment device of the galvanized round high-carbon steel wire for reinforcing the optical cable, wherein the drawing finished product of the A3 steel with the material carbon content of 0.80 percent is phi 1.0mm as an example:
a.∮5.5mm—→∮2.2mm
∮5.5mm—→∮4.9/20.60—→∮4.25/24.77—→∮3.75/22.15—→∮3.25/24.89—→∮2.80/25.28—→∮2.45/23.44—→∮2.2/19.37
the speed of the winding drum is 200m/min, the average compression ratio is 23.03 percent,
b.∮2.2mm—→∮2.2mm
lead quenching:
heating voltage 42(V), current density 14.31 (A/dm)2) Patenting temperature 520 (. degree.C.)
Electrogalvanizing: plating voltage 4(V), plating current 190 (A/each)
Current density 9.17 (A/dm)2)
The electrogalvanizing layer is more than or equal to 50 (g/m)2)
The plating speed is 12m/min
c. Phi 2.2 mm-phi 1.0mm drawing with a water tank drawing machine
∮2.2mm-—→∮2.05/13.2—→∮1.9/14.1—→∮1.78/12.2—→∮1.65/14.1—→∮1.52/15—→∮1.38/17.6—→∮1.25/17.8—→∮1.14/16.7—→∮1.06/13.5—→∮1.0/11
The speed of the winding drum is 450m/min
Fixed length 31000(m)
550 type I-shaped wheel for spool
The lubricating liquid of the water tank adopts grease lubricating liquid, the concentration is 7%, and the PH value is 10.
Claims (9)
- A process for manufacturing galvanized round high-carbon steel wire for reinforcing optical cable, which draws steel wire with carbon content of 0.60-0.82% (percentage content) to phi 1.5-3.5mm, and is characterized in that: and (3) carrying out heat treatment (2) → electrogalvanizing (3) → secondary drawing (4) on the steel wire (1) subjected to primary drawing, and then carrying out magnetic induction sizing device (5) → deformation straightening (6) → winding displacement (7) → winding (8).
- 2 the process for manufacturing the galvanized round high-carbon steel wire for reinforcing the optical cable according to claim 1, wherein the process comprises the following steps: drawing the finished steel wire (1) with the diameter phi of 0.6-2.0mm, wherein the heat treatment (2) is austenitizing and then quenching treatment is adopted.
- 3 the process for manufacturing the galvanized round high-carbon steel wire for reinforcing the optical cable according to claim 1, wherein the process comprises the following steps: drawing the finished steel wire (1) with the diameter phi of 2.1-3.0mm, wherein the heat treatment (2) is lead tempering treatment.
- The process for manufacturing the galvanized round high-carbon steel wire for reinforcing the optical cable according to claim 1, wherein the process comprises the following steps: the secondary drawing (4) can be performed by water tank drawing or dry drawing.
- 5 the process for manufacturing the galvanized round high-carbon steel wire for reinforcing the optical cable according to claim 1 or 4, wherein the process comprises the following steps: when the secondary drawing (4) of the steel wire (1) is dry drawing and the final two procedures of drawing to the diameter of the finished steel wire are carried out, the steel wire (1) needs to pass through a double-sleeve die device (9).
- An apparatus for manufacturing the galvanized round high-carbon steel wire for optical cable reinforcement according to claim 1, which comprises a wire drawing machine, a heat treatment tank and a plating tank, and is characterized in that: the high-carbon steel wire (1) passes through a secondary wire drawing machine (4 '), a magnetic induction sizing device (5), a stress eliminator (6') and a wire arrangement wheel device (7 '), and finally is an I-shaped wheel wire-rewinding machine (8').
- The apparatus for manufacturing galvanized round high-carbon steel wire for optical cable reinforcement according to claim 5 or 6, wherein: when the secondary drawing is used in the wire drawing machine, the used double-die device consists of two groups of die boxes (10), die sleeves (11) and a wire drawing die (12), wherein the middle part of each die box (10) is provided with a partition plate (20), and the distance (S) between the two die boxes is 200 mm and 400 mm.
- The apparatus for manufacturing galvanized round high-carbon steel wire for optical cable reinforcement according to claim 6, wherein: the magnetic induction sizing device (5) consists of a central shaft (17), a rotary sizing wheel (13), magnets (14, 14 '), a sizing display screen (15) and a support plate (16), wherein the magnet (14) on the side surface of the rotary sizing wheel (13) corresponds to the magnet (14 ') fixed on the support plate (16), and the magnet (14 ') is connected with the sizing display screen.
- The apparatus for manufacturing galvanized round high-carbon steel wire for optical cable reinforcement according to claim 6, wherein: the wire arrangement wheel device (7') is fixed on the connecting plate (19) by 2-5 wire arrangement wheels (18), the curvature radius R of the central track of the wire arrangement wheel set is 200-380mm, and the groove radius R of the wire arrangement wheels is 3.5-6.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95111200 CN1139760A (en) | 1995-09-22 | 1995-09-22 | Making tech. galvanized round highc arbon steel wire for optical cable reinforcing and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95111200 CN1139760A (en) | 1995-09-22 | 1995-09-22 | Making tech. galvanized round highc arbon steel wire for optical cable reinforcing and equipment |
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| CN1139760A true CN1139760A (en) | 1997-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95111200 Pending CN1139760A (en) | 1995-09-22 | 1995-09-22 | Making tech. galvanized round highc arbon steel wire for optical cable reinforcing and equipment |
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| CN102975422A (en) * | 2012-12-12 | 2013-03-20 | 华勤钢丝绳有限公司 | High-strength steel wire, preparation method of high-strength steel wire and super-high-strength steel wire rope for conveyer belt |
| CN103088378A (en) * | 2013-01-25 | 2013-05-08 | 启东市海纳精线科技有限公司 | Device and process for producing galvanized cutting wires |
| CN103785704A (en) * | 2014-01-23 | 2014-05-14 | 江苏兴达钢帘线股份有限公司 | Method for producing torsion-exfoliation-resistant extra-high-strength steel wires with excellent fatigue resistance |
| WO2018040536A1 (en) * | 2016-08-30 | 2018-03-08 | 龙南县格林庭园用品有限公司 | Method for preparing composite hot-galvanized steel wire |
| CN110184439A (en) * | 2019-06-28 | 2019-08-30 | 江苏宝钢精密钢丝有限公司 | A kind of production method of New Types of Card Clothing steel wire |
| CN111123452A (en) * | 2019-12-26 | 2020-05-08 | 江苏英杰光缆科技有限公司 | Method for improving strength of optical cable |
| CN113091679A (en) * | 2021-04-21 | 2021-07-09 | 中钢集团郑州金属制品研究院有限公司 | Method suitable for measuring thickness of soap powder on surface of steel wire |
| CN113560460A (en) * | 2021-06-21 | 2021-10-29 | 安徽珂洁日用品有限公司 | Hard stainless steel wire for manufacturing shot blasting line and machining process thereof |
| CN115287925A (en) * | 2022-08-01 | 2022-11-04 | 济宁长龙钢丝绳有限公司 | Corrosion-resistant surface contact steel wire rope for offshore wind power creeper-free device and manufacturing method thereof |
-
1995
- 1995-09-22 CN CN 95111200 patent/CN1139760A/en active Pending
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| CN102975422A (en) * | 2012-12-12 | 2013-03-20 | 华勤钢丝绳有限公司 | High-strength steel wire, preparation method of high-strength steel wire and super-high-strength steel wire rope for conveyer belt |
| CN102975422B (en) * | 2012-12-12 | 2015-04-22 | 华勤钢丝绳有限公司 | High-strength steel wire, preparation method of high-strength steel wire and super-high-strength steel wire rope for conveyer belt |
| CN103088378A (en) * | 2013-01-25 | 2013-05-08 | 启东市海纳精线科技有限公司 | Device and process for producing galvanized cutting wires |
| CN103785704A (en) * | 2014-01-23 | 2014-05-14 | 江苏兴达钢帘线股份有限公司 | Method for producing torsion-exfoliation-resistant extra-high-strength steel wires with excellent fatigue resistance |
| CN103785704B (en) * | 2014-01-23 | 2016-01-20 | 江苏兴达钢帘线股份有限公司 | Anti-torsion layering and the preparation method of the extra high strength steel wire of excelling in fatigue property |
| WO2018040536A1 (en) * | 2016-08-30 | 2018-03-08 | 龙南县格林庭园用品有限公司 | Method for preparing composite hot-galvanized steel wire |
| CN110184439A (en) * | 2019-06-28 | 2019-08-30 | 江苏宝钢精密钢丝有限公司 | A kind of production method of New Types of Card Clothing steel wire |
| CN111123452A (en) * | 2019-12-26 | 2020-05-08 | 江苏英杰光缆科技有限公司 | Method for improving strength of optical cable |
| CN113091679A (en) * | 2021-04-21 | 2021-07-09 | 中钢集团郑州金属制品研究院有限公司 | Method suitable for measuring thickness of soap powder on surface of steel wire |
| CN113560460A (en) * | 2021-06-21 | 2021-10-29 | 安徽珂洁日用品有限公司 | Hard stainless steel wire for manufacturing shot blasting line and machining process thereof |
| CN113560460B (en) * | 2021-06-21 | 2023-09-01 | 宁波日月不锈钢制品有限公司 | Hard stainless steel wire for manufacturing shot blasting wire and processing technology thereof |
| CN115287925A (en) * | 2022-08-01 | 2022-11-04 | 济宁长龙钢丝绳有限公司 | Corrosion-resistant surface contact steel wire rope for offshore wind power creeper-free device and manufacturing method thereof |
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