Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
• • 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
  • B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
  • B21C47/02—Winding-up or coiling
  • B21C47/10—Winding-up or coiling by means of a moving guide
  • B21C47/14—Winding-up or coiling by means of a moving guide by means of a rotating guide, e.g. laying the material around a stationary reel or drum
  • B21C47/143—Winding-up or coiling by means of a moving guide by means of a rotating guide, e.g. laying the material around a stationary reel or drum the guide being a tube
• • 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
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

Definitions

• the present disclosure relates to a laying head pipe comprising a specific ferritic- austenitic (duplex) stainless steel.
• the present disclosure also relates to the use of the specific duplex stainless steel as a laying head pipe, either as a whole pipe or as an inner tube and to a method of manufacturing an object, such as a wire rod, wherein said method comprises the step of providing a laying head pipe containing the specific duplex stainless steel.
• wire rod is formed by hot rolling wire rod billets and the finished wire rod is then directed into a laying head pipe, mounted in a rotating laying head, which lays the wire rod in an ordered coil (ring) pattern onto a continuously moving cooling lane (conveyor) behind the laying head.
• the wire rod is running at very high speed inside the rotating laying head pipe, thereby exerting the inside surface of the laying head pipe to high levels of wear.
• the exposure to high wear in combination with high temperature is a problem because tubes will have to be replaced when they have run out due to wear or cracks.
• Duplex stainless steels have been suggested to be used as laying head pipes and tests performed have shown that these steels will provide improvements in wear resistance compared to, for example, carbon steels. Even though said duplex stainless steels are working in today's machines there is a demand for a material which will work in even more demanding environment.
• the aspect of the present disclosure is to provide a solution to or to reduce the problems mentioned above by providing an improved laying head pipe with improved wear resistance compared with for example a carbon steel laying head pipe.
• the present disclosure therefore relates to a laying head pipe comprising a specific ferritic-austenitic (duplex) stainless steel.
• the present disclosure also relates to the use of the specific duplex stainless steel as a laying head pipe in a method for manufacturing a wire rod, which may be used to form coils (rings).
• the present disclosure also relates to a method of manufacturing a wire rod, in the form of rings, wherein said method comprises the step of providing a laying head pipe containing the specific duplex stainless steel.
• a laying head pipe is configured for rotation around an axis in a rolling mill laying head.
• the laying head pipe includes an inlet part, a curved part and an outlet part.
• the terms’’pipe” and’’’tube” are used interchangeably.
• Figure 1 A shows the front view of a laying head pipe
• Figure IB shows the side view of a laying head pipe.
• the present disclosure relates to a laying head pipe comprising a duplex stainless steel having the following composition in weight%:
• figure 1 shows a laying head pipe having an inlet part 1, a curved part 3 and outlet part 2.
• the wire rod is passed into the inlet part and continue in the curved part and is then passed through the outlet part where after it is coiled is allowed to cool.
• the laying head pipe comprises a duplex stainless steel having the following composition in weight%:
• the present duplex stainless steel would work as a laying head pipe because the working temperature during operation is higher than recommended for the present duplex stainless steel. Hence, the present duplex stainless steel should not withstand the erosion it is exposed to during the operation. However, the present duplex stainless steel did work excellent and without being bound to any theory it is believed that it is due to the kinetics of the sigma phase transition.
• the whole laying head pipe is composed of the duplex stainless steel as defined hereinabove or hereinafter. According to another embodiment, the whole laying head pipe consists of the duplex stainless steel as defined hereinabove or hereinafter.
• the laying head pipe is a composure of an inner tube and an outer tube and the inner tube comprises the duplex stainless steel as defined hereinabove or hereinafter.
• the inner tube consists of the duplex stainless steel as defined hereinabove or hereinafter.
• a pipe comprising the duplex stainless steel as defined hereinabove or hereinafter as a laying head pipe.
• the laying head pipe may be composed or may consist of the duplex stainless steel as defined hereinabove or hereinafter and the laying head pipe may comprise or consist of the duplex stainless steel as defined hereinabove or hereinafter.
• Yet another aspect of the present disclosure relates to a method of manufacturing a wire rod comprising the step of:
• the laying head pipe may be composed or may consist of the duplex stainless steel as defined hereinabove or hereinafter and the laying head pipe may have an inner tube comprising or consisting of the duplex stainless steel and defined hereinabove or hereinafter.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Manufacturing & Machinery (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Metal Extraction Processes (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=71401726

Family Applications (1)

Country Status (2)

Family Cites Families (8)

• 2020
  • 2020-06-23 WO PCT/EP2020/067531 patent/WO2020260299A1/en unknown
  • 2020-06-23 EP EP20735297.2A patent/EP3987074A1/de active Pending

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