US20240052565A1 - Compacted steel strand with cladded core - Google Patents
Compacted steel strand with cladded core Download PDFInfo
- Publication number
- US20240052565A1 US20240052565A1 US18/267,238 US202118267238A US2024052565A1 US 20240052565 A1 US20240052565 A1 US 20240052565A1 US 202118267238 A US202118267238 A US 202118267238A US 2024052565 A1 US2024052565 A1 US 2024052565A1
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- United States
- Prior art keywords
- steel
- steel strand
- corrosion resistant
- coating
- core wire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 142
- 239000010959 steel Substances 0.000 title claims abstract description 142
- 238000000576 coating method Methods 0.000 claims abstract description 52
- 239000011248 coating agent Substances 0.000 claims abstract description 48
- 238000005260 corrosion Methods 0.000 claims abstract description 38
- 230000007797 corrosion Effects 0.000 claims abstract description 38
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000005253 cladding Methods 0.000 claims abstract description 5
- 238000009713 electroplating Methods 0.000 claims abstract description 5
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- 238000007747 plating Methods 0.000 claims abstract description 4
- 239000000126 substance Substances 0.000 claims abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 17
- 239000004411 aluminium Substances 0.000 claims description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 16
- 229910000611 Zinc aluminium Inorganic materials 0.000 claims description 10
- 239000011701 zinc Substances 0.000 claims description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 8
- 229910052725 zinc Inorganic materials 0.000 claims description 8
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- GANNOFFDYMSBSZ-UHFFFAOYSA-N [AlH3].[Mg] Chemical compound [AlH3].[Mg] GANNOFFDYMSBSZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 229910000861 Mg alloy Inorganic materials 0.000 claims 1
- 239000000203 mixture Substances 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- -1 zinc-aluminium-magnesium Chemical compound 0.000 description 1
Images
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- 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
- D07B1/0693—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core having a strand configuration
-
- 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
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/22—Making metal-coated products; Making products from two or more metals
- B21C23/24—Covering indefinite lengths of metal or non-metal material with a metal coating
- B21C23/26—Applying metal coats to cables, e.g. to insulated electric cables
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- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
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- D07B1/147—Ropes or cables with incorporated auxiliary elements, e.g. for marking, extending throughout the length of the rope or cable comprising electric conductors or elements for information transfer
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- D07B—ROPES OR CABLES IN GENERAL
- D07B5/00—Making ropes or cables from special materials or of particular form
- D07B5/007—Making ropes or cables from special materials or of particular form comprising postformed and thereby radially plastically deformed elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F37/00—Manufacture of rings from wire
- B21F37/04—Manufacture of rings from wire of washers
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- D07B2201/2002—Wires or filaments characterised by their cross-sectional shape
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- D07B2401/00—Aspects related to the problem to be solved or advantage
- D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
- D07B2401/202—Environmental resistance
- D07B2401/2025—Environmental resistance avoiding corrosion
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Definitions
- the invention relates to a steel strand comprising a steel core wire surrounded by steel layer wires that are twisted around this steel core wire.
- the invention also relates to the use of such a steel strand as a pre-tensioned strand or as a post-tensioned strand.
- a steel strand comprising a steel core wire surrounded by steel layer wires that are twisted around this steel core wire is a flexible and robust tension member that finds many applications.
- the steel core wire and the steel layer wires usually have a circular cross-section.
- a closed layer of steel layer wires is formed around the steel core wire, i.e. a layer where all steel layer wires touch adjacent steel layer wires, interstices are formed between the steel core wire and the steel layer wires. Humid environments or moisture already present in these interstices may cause condensation and lead ultimately to corrosion and a premature end of life of the steel strand. Compacting the steel strand may reduce the size of the interstices but does not take the interstices completely away.
- the steel strand is subjected to tensile stresses and the mentioned potential corrosion failure problem is even more present.
- the steel core wire and the steel layer wires may be provided with a corrosion resistant coating to increase the lifetime of the steel strand.
- a corrosion resistant coating is a polymer coating. If of a sufficient thickness, the steel layer wires exercise a pressure on the polymer coating so that it starts to flow around the steel layer wires and fill the interstices. However, this polymer coating is not resistant against a downstream heat treatment of the rope. Another drawback is that the rope with a polymer inside cannot be installed and used in warm circumstances.
- Another corrosion resistant coating is a metallic coating such as a zinc or a zinc alloy coating applied by means of a hot dip operation or electroplating operation. While increasing the lifetime of the steel strand, these metallic coatings are not thick enough to fill the interstices.
- a steel strand comprising a steel core wire.
- the steel core wire is surrounded by steel layer wires that are twisted around the steel core wire.
- the steel core wire is covered with a corrosion resistant core coating provided by strip cladding or by metal extrusion.
- the steel layer wires are covered with a corrosion resistant layer coating provided by a hot dip operation or by an electroplating or chemical plating process.
- the steel strand is compacted so that the steel layer wires have a non-circular cross-section and that said corrosion resistant core coating fills the interstices between the steel core wire and the steel layer wires.
- the steel strand is provided with a two corrosion resistant coatings.
- a first way to provide the relatively thick core coating is by strip cladding.
- strip cladding a strip of a corrosion resistant metal and of predetermined and desired thickness can be formed into a tube form. The width of this strip is somewhat greater or equal to the circumference of the steel wire to be covered. The strip is closed in a tube and welded on or around the steel wire. The steel wire with the strip around is then drawn until its final steel core wire diameter.
- a second way to provide the relatively thick core coating is by means of metal extrusion. According to the technique of metal extrusion, corrosion resistant metal material is pushed through a die of the desired cross-section around the steel wire.
- a hot dip operation or an electroplating or chemical plating process are the ways apply the relatively thin layer corrosion resistant coating on the steel layer wires.
- the metal of the thick core coating When finally compacting the steel strand, the metal of the thick core coating will start to flow somewhat around the steel layer wires and fill the interstices between the steel core wire and the steel layer wires. In contrast with the polymer material, this metal material is able to resist high temperatures.
- the steel strand with the metal material inside can be subjected to downstream heat treatments, such as a stress-relieving treatment at about 350° C. to 420° C. Moreover, the steel strand can be installed and used in warm circumstances.
- the thick corrosion resistant core coating is of aluminium or of an aluminium alloy.
- the thick corrosion resistant coating has a weight ranging from 400 g/m 2 to 2500 g/m 2 , preferably from 450 g/m 2 to 2250 g/m 2 , where the smaller weights correspond to the smaller diameters and the higher weights correspond to the greater diameters.
- the thin corrosion resistant layer coating is of zinc or of a zinc alloy.
- a zinc aluminium coating has a better overall corrosion resistance than zinc.
- the zinc aluminium coating is temperature resistant. Still in contrast with zinc, there is no flaking with the zinc aluminium alloy when exposed to high temperatures.
- a zinc aluminium coating may have an aluminium content ranging from 2 percent by weight to 12 percent by weight, e.g. ranging from 3% to 11%.
- the zinc alloy coating may further have a wetting agent such as lanthanum or cerium in an amount less than 0.1 percent of the zinc alloy. The remainder of the coating is zinc and unavoidable impurities.
- Another preferable composition contains about 10% aluminium. This increased amount of aluminium provides a better corrosion protection then the eutectoid composition with about 5% of aluminium.
- a highly preferable composition in the context of the present invention is a zinc aluminium alloy that comprises 2% to 10% aluminium and 0.2% to 3.0% magnesium, the remainder being zinc.
- An example is 5% Al, 0.5% Mg and the rest being Zn.
- the thin corrosion resistant layer coating may have a weight ranging from 150 g/m 2 to 450 g/m 2 .
- the smaller weights correspond to the smaller diameters and the higher weights correspond to the greater diameters.
- the steel strand may have an outer diameter ranging from 6.0 mm to 25.0 mm, preferably from 6.5 mm to 20.0 mm.
- the steel strand can be used as a pre-tensioned strand or as a post-tensioned strand.
- the steel strand can be used in elevated transportation systems, in ACSR power cables, as guardrail, stay cable strand, umbilical or pre-cast concrete reinforcing elements.
- FIG. 1 shows a cross-section of a steel strand according to a first aspect of the present invention.
- FIG. 1 shows a cross-section of a steel strand 10 .
- the steel strand 10 has a steel core wire 12 and six steel layer wires 14 that are twisted around the steel core wire 12 .
- the steel core wire 12 is provided with an aluminium strip clad core coating 16 .
- the steel layer wires 14 are provided with a zinc aluminium magnesium layer coating 18 .
- the steel strand 10 is compacted so that the steel layer wires 14 obtain a trapezium-like cross-section.
- the steel layer wires 14 form a closed layer around the steel core wire 12 and push the aluminium strip clad core coating 16 to flow and fill the interstices between the steel core wire 12 and the steel layer wires 14 .
- the aluminium strip clad core coating 16 fills all interstices and holes inside the steel strand and prevents moisture from penetrating inside the steel strand 10 . At the same time the aluminium strip clad core coating 16 gives corrosion resistance to steel core wire 12 .
- the zinc aluminium magnesium layer coating 18 gives corrosion resistance to the steel layer wires 14 .
- a steel strand according to the invention can be made along following lines.
- composition of the starting material is usually a micro-alloyed high-carbon composition as follows: (all percentages being percentages by weight):
- the steel core wire is drawn until an intermediate steel wire diameter.
- An aluminium strip is formed and welded or extruded around the steel wire and the thus formed composite is further drawn until a final diameter.
- the steel layer wires are drawn until an intermediate steel wire diameter.
- the steel layer wires are then guided through a hot dip bath of zinc-aluminium-magnesium.
- the thus coated steel layer wires are then further drawn until their final wire diameter.
- the steel layer wires are twisted around the steel core wire with the aluminium strip to form a non-compacted steel strand. Thereafter, the steel strand is finally subjected to a compacting treatment.
- the compacted steel rope according to the invention is preferably subjected to a stress-relieving treatment in order to lower the relaxation and to improve the straightness.
- a suitable temperature for carrying out such a stress-relieving treatment is 380° C.
- the compacted steel rope according to the invention can obtain following tensile strength grades: 1700 MPa, 1860 MPa, 1960 MPa and 2060 MPa.
Abstract
A steel strand (10) comprises a steel core wire (12). This steel core wire (12) is surrounded by steel layer wires (14) that are twisted around the steel core wire (12). The steel core wire (12) is covered with a thick corrosion resistant core coating (16) provided by strip cladding or by metal extrusion. The steel layer wires (14) are covered with a thin corrosion resistant layer coating (18) provided by a hot dip operation or by an electroplating or chemical plating process. The steel strand (10) is compacted so that said steel layer wires (14) have a non-circular cross-section and that the thick corrosion resistant core coating fills the interstices between the steel core wire (12) and the steel layer wires (14) in order to give the steel strand (10) an improved corrosion resistance and increased lifetime.
Description
- The invention relates to a steel strand comprising a steel core wire surrounded by steel layer wires that are twisted around this steel core wire.
- The invention also relates to the use of such a steel strand as a pre-tensioned strand or as a post-tensioned strand.
- A steel strand comprising a steel core wire surrounded by steel layer wires that are twisted around this steel core wire is a flexible and robust tension member that finds many applications.
- The steel core wire and the steel layer wires usually have a circular cross-section. When a closed layer of steel layer wires is formed around the steel core wire, i.e. a layer where all steel layer wires touch adjacent steel layer wires, interstices are formed between the steel core wire and the steel layer wires. Humid environments or moisture already present in these interstices may cause condensation and lead ultimately to corrosion and a premature end of life of the steel strand. Compacting the steel strand may reduce the size of the interstices but does not take the interstices completely away. When used as a pre-tensioned steel strand or as a post-tensioned steel strand, the steel strand is subjected to tensile stresses and the mentioned potential corrosion failure problem is even more present.
- The steel core wire and the steel layer wires may be provided with a corrosion resistant coating to increase the lifetime of the steel strand.
- An example of a corrosion resistant coating is a polymer coating. If of a sufficient thickness, the steel layer wires exercise a pressure on the polymer coating so that it starts to flow around the steel layer wires and fill the interstices. However, this polymer coating is not resistant against a downstream heat treatment of the rope. Another drawback is that the rope with a polymer inside cannot be installed and used in warm circumstances.
- Another corrosion resistant coating is a metallic coating such as a zinc or a zinc alloy coating applied by means of a hot dip operation or electroplating operation. While increasing the lifetime of the steel strand, these metallic coatings are not thick enough to fill the interstices.
- It is a general object of the invention to avoid or mitigate the drawbacks of the prior art.
- It is a particular object of the invention to provide a steel strand that can operate under tensile forces and that has an increased lifetime.
- It is another object of the invention to fill in a sustainable way the interstices between the steel core wire and the steel layer wires.
- According to a first aspect of the invention, there is provided a steel strand. The steel strand comprises a steel core wire. The steel core wire is surrounded by steel layer wires that are twisted around the steel core wire. The steel core wire is covered with a corrosion resistant core coating provided by strip cladding or by metal extrusion. The steel layer wires are covered with a corrosion resistant layer coating provided by a hot dip operation or by an electroplating or chemical plating process. The steel strand is compacted so that the steel layer wires have a non-circular cross-section and that said corrosion resistant core coating fills the interstices between the steel core wire and the steel layer wires.
- Briefly stated, the steel strand is provided with a two corrosion resistant coatings. A relatively thick metallic coating around the steel core wire and relatively thin metallic coatings around the steel layer wires.
- A first way to provide the relatively thick core coating is by strip cladding. According to the technique of strip cladding, a strip of a corrosion resistant metal and of predetermined and desired thickness can be formed into a tube form. The width of this strip is somewhat greater or equal to the circumference of the steel wire to be covered. The strip is closed in a tube and welded on or around the steel wire. The steel wire with the strip around is then drawn until its final steel core wire diameter.
- A second way to provide the relatively thick core coating is by means of metal extrusion. According to the technique of metal extrusion, corrosion resistant metal material is pushed through a die of the desired cross-section around the steel wire.
- A hot dip operation or an electroplating or chemical plating process are the ways apply the relatively thin layer corrosion resistant coating on the steel layer wires.
- When finally compacting the steel strand, the metal of the thick core coating will start to flow somewhat around the steel layer wires and fill the interstices between the steel core wire and the steel layer wires. In contrast with the polymer material, this metal material is able to resist high temperatures. The steel strand with the metal material inside can be subjected to downstream heat treatments, such as a stress-relieving treatment at about 350° C. to 420° C. Moreover, the steel strand can be installed and used in warm circumstances.
- Preferably the thick corrosion resistant core coating is of aluminium or of an aluminium alloy.
- Most preferably, the thick corrosion resistant coating has a weight ranging from 400 g/m2 to 2500 g/m2, preferably from 450 g/m2 to 2250 g/m2, where the smaller weights correspond to the smaller diameters and the higher weights correspond to the greater diameters.
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- A steel strand with an outer diameter of 7.0 mm may have a weight of the thick corrosion resistant coating of 486 g/m2.
- A steel strand with an outer diameter of 15.2 mm may have a weight of the thick corrosion resistant coating of 810 g/m2.
- A steel strand with an outer diameter of 18.0 mm may have a weight of the thick corrosion resistant coating of 2119 g/m2.
- Preferably the thin corrosion resistant layer coating is of zinc or of a zinc alloy.
- A zinc aluminium coating has a better overall corrosion resistance than zinc. In contrast with zinc, the zinc aluminium coating is temperature resistant. Still in contrast with zinc, there is no flaking with the zinc aluminium alloy when exposed to high temperatures.
- A zinc aluminium coating may have an aluminium content ranging from 2 percent by weight to 12 percent by weight, e.g. ranging from 3% to 11%.
- One preferable composition lies around the eutectoid position: Aluminium about 5 percent. The zinc alloy coating may further have a wetting agent such as lanthanum or cerium in an amount less than 0.1 percent of the zinc alloy. The remainder of the coating is zinc and unavoidable impurities.
- Another preferable composition contains about 10% aluminium. This increased amount of aluminium provides a better corrosion protection then the eutectoid composition with about 5% of aluminium.
- A highly preferable composition in the context of the present invention is a zinc aluminium alloy that comprises 2% to 10% aluminium and 0.2% to 3.0% magnesium, the remainder being zinc. An example is 5% Al, 0.5% Mg and the rest being Zn.
- Other elements such as silicon (Si) may be added to the zinc aluminium alloy coatings mentioned above.
- The thin corrosion resistant layer coating may have a weight ranging from 150 g/m2 to 450 g/m2. Here again, the smaller weights correspond to the smaller diameters and the higher weights correspond to the greater diameters.
- The steel strand may have an outer diameter ranging from 6.0 mm to 25.0 mm, preferably from 6.5 mm to 20.0 mm.
- According to a second aspect of the invention, the steel strand can be used as a pre-tensioned strand or as a post-tensioned strand.
- The steel strand can be used in elevated transportation systems, in ACSR power cables, as guardrail, stay cable strand, umbilical or pre-cast concrete reinforcing elements.
-
FIG. 1 shows a cross-section of a steel strand according to a first aspect of the present invention. -
FIG. 1 shows a cross-section of asteel strand 10. Thesteel strand 10 has asteel core wire 12 and sixsteel layer wires 14 that are twisted around thesteel core wire 12. Thesteel core wire 12 is provided with an aluminium strip cladcore coating 16. Thesteel layer wires 14 are provided with a zinc aluminiummagnesium layer coating 18. - The
steel strand 10 is compacted so that thesteel layer wires 14 obtain a trapezium-like cross-section. Thesteel layer wires 14 form a closed layer around thesteel core wire 12 and push the aluminium strip cladcore coating 16 to flow and fill the interstices between thesteel core wire 12 and thesteel layer wires 14. - The aluminium strip clad
core coating 16 fills all interstices and holes inside the steel strand and prevents moisture from penetrating inside thesteel strand 10. At the same time the aluminium strip cladcore coating 16 gives corrosion resistance tosteel core wire 12. - The zinc aluminium
magnesium layer coating 18 gives corrosion resistance to thesteel layer wires 14. - A steel strand according to the invention can be made along following lines.
- The composition of the starting material (wire rod) is usually a micro-alloyed high-carbon composition as follows: (all percentages being percentages by weight):
-
- a carbon content (% C) ranging from 0.50% to 1.20%, e.g. 0.60% to is 1.0%;
- a manganese content (% Mn) ranging from 0.10% to 1.0%, e.g. from 0.20% to 0.80%;
- a silicon content (% Si) ranging from 0.10% to 1.50%, e.g. from 0.15% to 0.70%;
- a sulphur content (% S) below 0.03%, e.g. below 0.01%;
- a phosphorus content (% P) below 0.03%, e.g. below 0.01%.
- Micro-alloying elements such as chromium, vanadium, aluminium or nickel may or may not be present in amounts up to 0.50%.
- Starting from wire rod, the steel core wire is drawn until an intermediate steel wire diameter. An aluminium strip is formed and welded or extruded around the steel wire and the thus formed composite is further drawn until a final diameter.
- Starting also from wire rod, the steel layer wires are drawn until an intermediate steel wire diameter. The steel layer wires are then guided through a hot dip bath of zinc-aluminium-magnesium. The thus coated steel layer wires are then further drawn until their final wire diameter.
- The steel layer wires are twisted around the steel core wire with the aluminium strip to form a non-compacted steel strand. Thereafter, the steel strand is finally subjected to a compacting treatment.
- Examples of a 1+6 steel strand (6 steel layer wires):
-
- diameters of the steel core wire resp. (steel only): 2.64 mm, 5.60 mm, 6.50 mm;
- diameters of the steel core wire with aluminium strip: 3.00 mm, 6.35 mm, 8.07 mm;
- diameters of the coated and drawn steel layer wires: 2.53 mm, 5.60 mm, 6.46 mm;
- diameter of the compacted steel strand: 7.0 mm, 15.2 mm, 18.0 mm.
- The compacted steel rope according to the invention is preferably subjected to a stress-relieving treatment in order to lower the relaxation and to improve the straightness. A suitable temperature for carrying out such a stress-relieving treatment is 380° C.
- The compacted steel rope according to the invention can obtain following tensile strength grades: 1700 MPa, 1860 MPa, 1960 MPa and 2060 MPa.
-
-
- 10 Steel strand
- 12 Steel core wire
- 14 Steel layer wire
- 16 Thick corrosion resistant core coating
- 18 Thin corrosion resistant layer coating
Claims (11)
1. A steel strand comprising
a steel core wire,
said steel core wire surrounded by steel layer wires that are twisted around said steel core wire,
said steel core wire covered with a corrosion resistant core coating provided by strip cladding or by metal extrusion,
said steel layer wires covered with a corrosion resistant layer coating provided by a hot dip operation or by an electroplating or chemical plating process,
said steel strand being compacted so that said steel layer wires have a non-circular cross-section and that said corrosion resistant core coating fills the interstices between the steel core wire and the steel layer wires.
2. The steel strand according to claim 1 ,
wherein said corrosion resistant core coating is of aluminium or an aluminium alloy.
3. The steel strand according to claim 1 ,
where said corrosion resistant core coating has a weight ranging from 400 g/m2 to 2500 g/m2.
4. The steel strand according to claim 1 ,
wherein said corrosion resistant layer coating is of zinc or a zinc alloy.
5. The steel strand according to claim 4 ,
wherein said corrosion resistant layer coating has a weight ranging from 150 g/m2 to 450 g/m2.
6. The steel strand according to claim 4 ,
wherein said corrosion resistant layer coating is a zinc aluminium alloy.
7. The steel strand according to claim 6 ,
wherein said corrosion resistant layer coating is a zinc aluminium magnesium alloy.
8. The steel strand according to claim 1 ,
wherein said steel strand has an outer diameter ranging from 10.0 mm to 30.0 mm.
9. The steel strand according to claim 1 ,
wherein said steel strand is in a stress-relieved state.
10. Use of the steel strand according to claim 1 as a pre-tensioned strand.
11. Use of the steel strand according to claim 1 as a post-tensioned strand.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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EP20214792.2 | 2020-12-17 | ||
EP20214792 | 2020-12-17 | ||
PCT/EP2021/085721 WO2022129067A1 (en) | 2020-12-17 | 2021-12-14 | Compacted steel strand with cladded core |
Publications (1)
Publication Number | Publication Date |
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US20240052565A1 true US20240052565A1 (en) | 2024-02-15 |
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ID=73855208
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US18/267,238 Pending US20240052565A1 (en) | 2020-12-17 | 2021-12-14 | Compacted steel strand with cladded core |
Country Status (4)
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US (1) | US20240052565A1 (en) |
EP (1) | EP4263934A1 (en) |
CN (1) | CN116710611A (en) |
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Publication number | Priority date | Publication date | Assignee | Title |
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US3131469A (en) * | 1960-03-21 | 1964-05-05 | Tyler Wayne Res Corp | Process of producing a unitary multiple wire strand |
EP1118397A1 (en) * | 2000-01-19 | 2001-07-25 | N.V. Bekaert S.A. | A deformed metal composite wire |
WO2008098811A1 (en) * | 2007-02-16 | 2008-08-21 | Nv Bekaert Sa | An improved steel core for an electric transmission cable and method of fabricating it |
CN101796246B (en) * | 2007-09-06 | 2012-03-28 | 贝卡尔特股份有限公司 | Steel rope safety system with compacted ropes |
-
2021
- 2021-12-14 WO PCT/EP2021/085721 patent/WO2022129067A1/en active Application Filing
- 2021-12-14 CN CN202180085153.9A patent/CN116710611A/en active Pending
- 2021-12-14 EP EP21859356.4A patent/EP4263934A1/en active Pending
- 2021-12-14 US US18/267,238 patent/US20240052565A1/en active Pending
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CN116710611A (en) | 2023-09-05 |
WO2022129067A1 (en) | 2022-06-23 |
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