WO2020260299A1 - A laying head pipe - Google Patents

A laying head pipe Download PDF

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Publication number
WO2020260299A1
WO2020260299A1 PCT/EP2020/067531 EP2020067531W WO2020260299A1 WO 2020260299 A1 WO2020260299 A1 WO 2020260299A1 EP 2020067531 W EP2020067531 W EP 2020067531W WO 2020260299 A1 WO2020260299 A1 WO 2020260299A1
Authority
WO
WIPO (PCT)
Prior art keywords
laying head
head pipe
stainless steel
pipe
duplex stainless
Prior art date
Application number
PCT/EP2020/067531
Other languages
French (fr)
Inventor
Johan Hernblom
Alessandra SPAGHETTI
Original Assignee
Ab Sandvik Materials Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ab Sandvik Materials Technology filed Critical Ab Sandvik Materials Technology
Priority to EP20735297.2A priority Critical patent/EP3987074A1/en
Publication of WO2020260299A1 publication Critical patent/WO2020260299A1/en

Links

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.

Landscapes

  • 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)

Abstract

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.

Description

A laying head pipe
Technical field
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.
Background
In a typical wire rod rolling mill, 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. During laying, 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. As can be understood, 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.
There have been attempts to reduce the wear by for example carburizing the interior pipe surfaces in order to increase hardness and resistance to wear. However, the carburizing process requires a drastic quenching from elevated processing temperatures, which can distort the pipe curvature. The carburized layer has also been found to be relatively brittle. There have also been attempts to have a wearing layer on the surface of the inner pipe, but those attempts have not been successful.
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.
It is therefore a need for a new type of material which will withstand the wear.
Summary
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.
Furthermore, 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).
Additionally, 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.
According to the present disclosure, 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. Furthermore, in the present disclosure, the terms’’pipe” and’’tube” are used interchangeably.
Brief description of the Figures
Figure 1 A shows the front view of a laying head pipe;
Figure IB shows the side view of a laying head pipe.
Detailed description The present disclosure relates to a laying head pipe comprising a duplex stainless steel having the following composition in weight%:
Cr 28 to 30;
Ni 5 to 8;
Mo 1 to 3;
Mn 0.5 to 2.0;
Cu 0 to 0.8;
N 0.1 to 0.5;
Si 0 to 0.5;
C 0 to 0.03;
P 0 to 0.03;
S 0 to 0.03;
Balance Fe and unavoidable impurities.
Rolling small-diameter hot wire rods at high wire rod speeds with conventional laying head pipes will wear the pipe out and have an impact on the quality and consistency of the final product. The present duplex stainless steel will enable higher wear resistance and thereby improve the quality of the product and increase the productivity in the wire rod mills because there will be fewer shutdowns due to changing of worn pipes. As stated above, 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.
According to one embodiment, the laying head pipe comprises a duplex stainless steel having the following composition in weight%:
Cr 28 to 30;
Ni 6 to 8;
Mo 2 to 3;
Mn 0.5 to 1.5;
Cu 0 to 0.8;
N 0.3 to 0.4; Si 0.2 to 0.4;
P 0 to 0.03;
S 0 to 0.03;
Balance Fe and unavoidable impurities.
It is very surprising that 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.
According to another embodiment, 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.
According to another embodiment, 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. According to one embodiment, the inner tube consists of the duplex stainless steel as defined hereinabove or hereinafter.
Another aspect of the present disclosure relates to a use of a pipe comprising the duplex stainless steel as defined hereinabove or hereinafter as a laying head pipe. As described above, 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:
Providing a pipe comprising the duplex stainless steel as defined hereinabove or hereinafter; Inserting the pipe in a wire rod mill as a laying head pipe.
As described above, 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. By using a laying head pipe composed of duplex stainless steel as defined hereinabove or hereinafter, in the present method, the severe wear at the inner surface of the laying head pipe caused by abrasion will be reduced as the present duplex stainless steel will be able to withstand the high wear between the hot wire rod and the laying head pipe inside surface at high wire rod speeds. Furthermore, by using the present duplex stainless steel, the production of the wire rods is increased as higher wire rod speeds are combined with rising production output per day.

Claims

1. A laying head pipe comprising a duplex stainless steel having the following composition in weight%:
Cr 28 to 30;
Ni 5 to 8;
Mo 1 to 3;
Mn 0.5 to 2.0;
Cu 0 to 0.8;
N 0.1 to 0.5;
Si 0 to 0.5;
C 0 to 0.03;
P 0 to 0.03;
S 0 to 0.03;
Balance Fe and unavoidable impurities.
2. The laying head pipe according to claim 1 , wherein the duplex stainless steel has the following composition in weight%:
Cr 28 to 30;
Ni 6 to 8;
Mo 2 to 3;
Mn 0.5 to 1.5;
Cu 0 to 0.8;
N 0.3 to 0.4;
Si 0.2 to 0.4;
P 0 to 0.03;
S 0 to 0.03;
Balance Fe and unavoidable impurities.
3. The layer head pipe according to claim 1 or claim 2, wherein the whole pipe is composed of the duplex stainless steel as defined in claim 1 or claim 2.
4. The layer head pipe according to claim 1 or claim 2, wherein the layered head pipe is composed an inner and an outer tube and wherein the inner tube is composed of the duplex stainless steel as defined in claim 1 or claim 2.
5. Use of a pipe comprising the duplex stainless steel as defined in claim 1 or claim 2 as a laying head pipe.
6. The use according to claim 5, wherein the pipe is an inner pipe of the laying head pipe.
7. A method of manufacturing a wire rod comprising the step of:
Providing a pipe comprising the duplex stainless steel as defined in claim 1 or claim 2.
Inserting the pipe in a wire rod mill as a laying head pipe.
8 The method according to claim 7, wherein said pipe is an inner pipe of a laying head pipe.
PCT/EP2020/067531 2019-06-24 2020-06-23 A laying head pipe WO2020260299A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20735297.2A EP3987074A1 (en) 2019-06-24 2020-06-23 A laying head pipe

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1900113-0 2019-06-24
SE1900113 2019-06-24

Publications (1)

Publication Number Publication Date
WO2020260299A1 true WO2020260299A1 (en) 2020-12-30

Family

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WO (1) WO2020260299A1 (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5582656A (en) * 1993-06-21 1996-12-10 Sandvik Ab Ferritic-austenitic stainless steel
JPH11269612A (en) * 1998-03-19 1999-10-05 Nippon Steel Corp Stainless steel for crude sulfuric acid and its production
US6174386B1 (en) * 1998-02-18 2001-01-16 Sandvik Ab NaOH evaporator comprising at least one component formed by a high strength stainless steel
US6451133B1 (en) * 1998-10-23 2002-09-17 Sandvik Ab Stainless steel for use in seawater applications
US6689231B1 (en) * 1999-06-21 2004-02-10 Sandvik Ab Use of stainless steel alloy as umbilical tubes in seawater environment
US20120079862A1 (en) * 2010-10-04 2012-04-05 Siemens Industry, Inc. Boronized laying pipe
US20150050180A1 (en) * 2011-11-04 2015-02-19 Outokumpu Oyj Duplex Stainless Steel
US20180195158A1 (en) * 2015-07-20 2018-07-12 Stamicarbon B.V. Duplex stainless steel and use thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5582656A (en) * 1993-06-21 1996-12-10 Sandvik Ab Ferritic-austenitic stainless steel
US6174386B1 (en) * 1998-02-18 2001-01-16 Sandvik Ab NaOH evaporator comprising at least one component formed by a high strength stainless steel
JPH11269612A (en) * 1998-03-19 1999-10-05 Nippon Steel Corp Stainless steel for crude sulfuric acid and its production
US6451133B1 (en) * 1998-10-23 2002-09-17 Sandvik Ab Stainless steel for use in seawater applications
US6689231B1 (en) * 1999-06-21 2004-02-10 Sandvik Ab Use of stainless steel alloy as umbilical tubes in seawater environment
US20120079862A1 (en) * 2010-10-04 2012-04-05 Siemens Industry, Inc. Boronized laying pipe
US20150050180A1 (en) * 2011-11-04 2015-02-19 Outokumpu Oyj Duplex Stainless Steel
US20180195158A1 (en) * 2015-07-20 2018-07-12 Stamicarbon B.V. Duplex stainless steel and use thereof

Also Published As

Publication number Publication date
EP3987074A1 (en) 2022-04-27

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