WO2014057170A1 - Method for enhancing fatigue durability of a conveyor belt of a strand sintering furnace, and conveyor belt - Google Patents

Method for enhancing fatigue durability of a conveyor belt of a strand sintering furnace, and conveyor belt Download PDF

Info

Publication number
WO2014057170A1
WO2014057170A1 PCT/FI2013/050971 FI2013050971W WO2014057170A1 WO 2014057170 A1 WO2014057170 A1 WO 2014057170A1 FI 2013050971 W FI2013050971 W FI 2013050971W WO 2014057170 A1 WO2014057170 A1 WO 2014057170A1
Authority
WO
WIPO (PCT)
Prior art keywords
conveyor belt
compressive residual
residual stresses
treated
groups
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.)
Ceased
Application number
PCT/FI2013/050971
Other languages
French (fr)
Inventor
Paavo LAIHONEN
Mari Lindgren
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Metso Corp
Original Assignee
Outotec Oyj
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 Outotec Oyj filed Critical Outotec Oyj
Priority to AU2013328502A priority Critical patent/AU2013328502B2/en
Priority to SE1550426A priority patent/SE1550426A1/en
Priority to BR112015007803A priority patent/BR112015007803A2/en
Priority to CN201380052663.1A priority patent/CN104812685B/en
Priority to CA2885307A priority patent/CA2885307C/en
Priority to EA201590513A priority patent/EA028479B1/en
Publication of WO2014057170A1 publication Critical patent/WO2014057170A1/en
Anticipated expiration legal-status Critical
Priority to ZA2015/03137A priority patent/ZA201503137B/en
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
    • B65G15/30—Belts or like endless load-carriers
    • B65G15/48—Belts or like endless load-carriers metallic
    • 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
    • C21D10/00—Modifying the physical properties by methods other than heat treatment or deformation
    • C21D10/005—Modifying the physical properties by methods other than heat treatment or deformation by laser shock processing
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
    • C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/06—Endless-strand sintering machines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path being carried by a conveyor
    • F27B9/243—Endless-strand conveyor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2207/00—Indexing codes relating to constructional details, configuration and additional features of a handling device, e.g. Conveyors
    • B65G2207/22—Heat or fire protection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2207/00—Indexing codes relating to constructional details, configuration and additional features of a handling device, e.g. Conveyors
    • B65G2207/48—Wear protection or indication features
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/12—Travelling or movable supports or containers for the charge
    • F27D2003/121—Band, belt or mesh

Definitions

  • the current repair method is to weld patches onto the cracked area, but it helps only temporarily as repair welding impairs the properties of the surrounding ma ⁇ teria.! and causes distortions due to non-uniform heat ⁇ ing, Consequently, the belt must be discarded and re ⁇ placed, which limits the lifetime of the belt.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Thermal Sciences (AREA)
  • Belt Conveyors (AREA)
  • Tunnel Furnaces (AREA)

Description

METHOD FOR ENHANCING FATIGUE DURABILITY OF A CONVEYOR BELT OF A STRAND SINTERING FURNACE, AND CONVEYOR BELT
FIELD OF THE INVENTION
The present invention relates to a method for enhanc¬ ing fatigue durability of a conveyor belt of a strand sintering furnace. Further, the present invention relates to a conveyor belt of a strand sintering fur¬ nace .
BACKGROUND OF THE INVENTION
Continuous strand sintering is used for agglomerizing pellets after pelletizing a concentrate powder, improving the strength and the reactivity of the pel- lets.
As an example of the strand sintering technique, a strand sintering furnace could be mentioned, which is used in the production of ferro-chromium and divided into several sequential zones, different temperature conditions prevailing in each one of them. The strand sintering equipment includes a conveyor belt, which is a perforated steel belt. It is conveyed as an endless loop around two deflector rolls. At the forward end of the furnace, wet fresh pellets are fed onto the steel belt to form a pellet bed. The steel belt conveys the bed of pellets through the drying, heating, and sintering zones of the furnace and to a stabilizing or equalizing zone, after which the bed of pellets fur- ther travels through sequential cooling zones. After travelling through the cooling zones, the sintered pellets exit the strand sintering equipment at its tail . As disclosed e.g. in documents WO 01/55659 Al and WO 2009/022059 Al, the conveyor belt of a strand sinter¬ ing furnace is formed from a number of rectangular steel plate elements that are sequentially welded to each other by weld seams. Each plate element includes a plurality of holes arranged into a plurality of groups of perforations to enable the flow-through of the gas used in the sintering process.
During operation, the conveyor belts are subjected to static and dynamical loads, corrosive environment and elevated temperature. Dynamical loads, i.e. fatigue loads, cause damage that commonly limits the lifetime of the belt. Cyclic loads (fatigue loads) are generat¬ ed, when the belt rotates around the d.eflector rolls. Because the perforations act as stress raisers, fa¬ tigue cracks are typically initiated, and. start to grow. This leads to damage, especially in the perfo¬ rated regions. Fatigue occurs when a material is sub¬ jected to repeated loading and unloading and at least part of the loading cycle is tensile. If the loads are above a certain threshold,- microscopic cracks will begin to form at the surface . Eventually a crack will reach a critical size, and. the structure will suddenly fracture . Load related factors that influence the fa¬ tigue life are for example stress amplitude and mean stress. The tensile part of the load cycle will cause fatigue as crack surfaces are torn open and the crack is able to proceed.
The conveyor belt is made by welding. Weld seams are problematic in cyclically loaded structures because a weld seam changes the geometry locally and as a conse¬ quence act as a stress raiser. Additionally, tensile residual stresses are generated and the weld seam mi- crostructure may not attain the properties of the base material .
The current repair method is to weld patches onto the cracked area, but it helps only temporarily as repair welding impairs the properties of the surrounding ma¬ teria.! and causes distortions due to non-uniform heat¬ ing, Consequently, the belt must be discarded and re¬ placed, which limits the lifetime of the belt.
OBJECT OF THE INVENTION
The object of the invention is to eliminate the disad¬ vantages mentioned above. In particular, it is an object of the invention to provide a method by which the fatigue durability of a conveyor belt can be enhanced.
Further, it is an object of the invention to provide a conveyor belt having a prolonged fatigue life and a longer lifetime.
Further, it is an object of the invention to provide a conveyor belt in which the improved fatigue life can be achieved with leaner (and cheaper) stainless steel alloys .
Further, it is an object of the invention to provide a method which may improve yield stress of the material of the conveyor belt, which may alleviate problems with local yielding.
Further, it is an object of the invention to provide a method which can be used for a new conveyor belt while it is manufactured and also for existing conveyor belts which are already in use.
SUMMARY OF THE INVENTION
According to an aspect of the invention, the present invention provides a method for enhancing fatigue du¬ rability of a conveyor belt of a strand sintering fur¬ nace. The conveyor belt is formed from a number of rectangular steel plate elements that are sequentially welded to each other by weld seams, each plate element including a plurality of holes arranged into a plural¬ ity of groups of perforations to enable the flow- through of the gas used in the sintering process. Ac¬ cording to the invention, the conveyor belt is treated to create compressive residual stresses at a surface of the conveyor belt at least in critical regions which are susceptible to fatigue breakage.
According to another aspect of the invention, the present invention provides a conveyor belt of a strand sintering furnace. The conveyor belt is formed from a number of rectangular steel plate elements that are sequentially welded to each other by weld seams, each plate element including a plurality of holes arranged into a plurality of groups of perforations to enable the flow-through of the gas used in the sintering process. The conveyor belt includes compressive residual stresses at a surface of the conveyor belt at least in critical regions which are susceptible to fatigue breakage .
The invention makes it possible to prevent fatigue failures in the conveyor belt, thus prolonging its fa¬ tigue life. Further, the invention makes it possible to use leaner (and cheaper) stainless steel alloys for the material of the belt and still gain a long fatigue life. Further, an advantage of the invention is that it may improve yield stress of the material of the conveyor belt, which may alleviate problems with local yielding. The method of the invention can be imple¬ mented to newly manufactured conveyor belts in connec¬ tion to their manufacturing process. The invention can as well be implemented to conveyor belts already in use to prolong the fatigue life of such conveyor belts . In one embodiment of the invention, in the method, the conveyor belt is treated to create compressive residual stresses at the surface of the conveyor belt at regions of the groups of perforations.
In one embodiment of the invention, in the method, the conveyor belt is treated to create compressive residual stresses at the surface of the conveyor belt in regions of the weld seams.
In one embodiment of the invention, in the method, the surface on the outer side of the conveyor belt, which outer surface, in operation, is repeatedly subjected to tensile stress, is treated to create the compressive residual stresses on the outer side of the conveyor belt .
In one embodiment of the invention, in the method, the surfaces of both sides of the conveyor belt are treated to create the compressive residual stresses on both sides of the conveyor belt.
In one embodiment of the invention, in the method, the conveyor belt is treated to create compressive residual stresses substantially only in the regions of groups of perforations and in the regions of the weld seams while other areas of the conveyor are left untreated. In one embodiment of the invention, in the method, the treatment to create compressive residual stresses is chosen from a group of treatment processes including shot peening, ultrasonic hammering, laser shock peen- ing. Shot peening is a well-known cold working process used to produce a compressive residual stress layer and modify mechanical properties of metals. It entails impacting a surface with shot (round metallic, glass, or ceramic particles) with a force sufficient to cre¬ ate plastic deformation. The plastic deformation induces a residual compressive stress in a peened sur¬ face, along with tensile stress of smaller magnitude in the interior. Surface compressive stresses confer resistance to metal fatigue and to some forms of stress corrosion cracking. The tensile stresses on the surface are problematic because cracks tend to start on the surface. Ultrasonic hammering- is a well-known metallurgical processing technique, similar to work hardening, in which ultrasonic energy is applied to a metal object. The ultrasonic treatment can result in controlled residual compressive stress, grain refine¬ ment and grain size reduction. Low and high cycle fa- tigue resistance are enhanced. Further, laser shock peening is the process of hardening or peening metal using a powerful laser. Laser peening can impart on a surface a layer of residual compressive stress that is four times deeper than that attainable from conven- tional shot peening treatments.
In one embodiment of the invention, in the method, the conveyor belt is treated in a flat form to create said compressive residual stresses. After treatment, the free ends of the conveyor belt are welded together by an installation weld seam to form the conveyor belt into an endless loop form. Thereafter, the installation weld seam is treated to create compressive residual stresses in the region of the installation weld seam.
In one embodiment of the invention, the conveyor belt includes compressive residual stresses at the surface of the conveyor belt in the regions of the groups of the perforations. In one embodiment of the invention, the conveyor belt includes compressive residual stresses at the surface of the conveyor belt in the regions of the weld seams. In one embodiment of the invention, the material of the conveyor belt is chosen from stainless steel grades including: ferritic chromium-alloyed stainless steel, austenitic-martensitic precipitation hardened stainless steel, austenitic stainless steel, austenitic-ferritic duplex stainless steel.
In one embodiment of the invention, each plate element comprises two long edges in the lateral direction of the conveyor belt, which are parallel to and spaced from each other, the long edge of a similar adjacent second plate element being connected to each long edge, and two short edges in the longitudinal direc¬ tion of the conveyor belt, which are spaced from each other by a distance corresponding to the width of the conveyor belt.
In one embodiment of the invention, the groups of per¬ forations are rectangular and elongated, extending in the direction of the conveyor belt, the groups of per- forations being parallel to each other and spaced from each other by a first imperforated area.
In one embodiment of the invention, the groups of per¬ forations are subdivided into a number of subgroups of perforations spaced from each other by a second imper¬ forated area.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings, which are included to pro¬ vide a further understanding of the invention and constitute a part of this specification, illustrate embodiments of the invention and together with the de¬ scription help to explain the principles of the inven¬ tion. In the drawings: Figure 1 is a plan view of a part of an embodiment of the conveyor belt according to the invention,
Figure 2 shows the detail P of Figure 1, Figure 3 schematically shows a cross-section of the conveyor belt treated to include compressive residual stresses on its surfaces and the distribution of ten¬ sile and compressive stresses in a situation when no load is exerted, and
Figure 4 shows the cross section of Figure 3 in a sit¬ uation when a bending load is exerted on the belt.
DETAILED DESCRIPTION OF THE INVENTION
Figure 1 shows part of the conveyor belt 1 of a strand sintering furnace (not shown) . The conveyor belt 1 consists of a number of rectangular steel plate ele¬ ments 2 that are sequentially welded to each other by weld seams 3.
Each plate element 2 includes a plurality of holes 4 arranged into a plurality of groups 5 of perforations to enable the flow-through of the gas used in the sin¬ tering process. The arrangement of the holes 4 into groups 5 and subgroups 5' substantially corresponds to that disclosed in WO 2009/022059 Al .
Each plate element 2 comprises two long edges 6, 7 in the lateral direction y of the conveyor belt, which are parallel with and spaced from each other. The long edge of a similar adjacent second plate element is connected to each long edge 6, 7 by a weld seam 3. The two short edges 8, 9 are in the longitudinal di¬ rection x of the conveyor belt 1. The short edges are parallel and spaced from each other by a distance de¬ fining the width L of the conveyor belt. The groups 5 of perforations are rectangular and elongated, extend¬ ing in the direction of the conveyor belt. The groups 5 of perforations are parallel to each other and spaced from each other by a first imperforated area 10. The groups 5 of perforations are further subdivid- ed into a number of subgroups 5' of perforations spaced from each other by a second imperforated area 11.
The outer side is of the conveyor belt 1 in its end- less loop form, in operation, is repeatedly subjected to tensile stresses as it turns around the deflector rolls. Therefore at least the outer surface of the conveyor belt 1 has been treated to induce compressive residual stresses at the outer side surface of the con- veyor belt at least in critical regions A and B which are susceptible to fatigue breakage.
The critical regions are the regions A of the groups 5 of the perforations and the regions B of the weld seams 3. These regions A and B are schematically indicated in Figures 1 and 2 as areas enclosed by dot-and-dash lines. The compressive residual stresses at the sur¬ faces of the belt can be achieved by subjecting the regions A and B to shot peening, ultrasonic hammering or laser shock peening etc..
The material of the conveyor belt 1 may preferably be ferritic chromium-alloyed stainless steel (e.g. 3Cr 12) , austenitic-martensitic precipitation hardened stainless steel, austenitic stainless steel or austen- itic-ferritic duplex stainless steel. In the perforated region 5, 5', the holes 4 act as stress raisers, meaning that the local stress is sig¬ nificantly higher than the applied stress. Weld seams 3, on the other hand, always have high tensile residu- al stresses that are caused by restricted thermal ex¬ pansion of the weld seam during weld deposition and cooling. By implementing the method, of the invention, the harmful tensile residual stresses in the weld can be alleviated, or beneficial compressive residual stresses can be created in the perforated area, and the fatigue life can be prolonged significantly. When the belt is treated with a. suitable process {e.g. with shot peening, ultrasonic hammering, laser shock peen- ing) , the underlying metal contracts the free movement of the surface, and compressive residual stresses are created on the surface.
Figure 3 illustrates a cross-section of the conveyor belt 1 in which both opposite surfaces of the regions of the groups 5 of perforations have been treated so as to create compressive residual stresses. Figure 3 shows a stress distribution inside the steel material of the belt in the unloaded condition wherein the surfaces are in compression while the core is in tension to balance out the forces as shown in Figure 3.
Figure 4 shows the belt structure and the stress dis¬ tribution of Figure 3 under a load resulting from the additive combination of stresses due to bend loading and the initial compressive residual stresses . As shown in Figure 4, the surface of the belt structure is still in compression eve on the convex side (upper side in Figure 4) and fatigue failures do not occur . The center is under a tensile stress and the concave side (lower sid.e in the Figure 4) is in compression. The belt structure can be loaded until the convex side is i tension, but this tensile stress would be far ?hat i t ;ld be i f the be l l s truct i
It is obvious to a person skilled in the art that with the advancement of technology, the basic idea of the invention may be implemented in various ways. The in¬ vention and its embodiments are thus not limited to the examples described above; instead, they may vary within the scope of the claims.

Claims

1. A method for enhancing fatigue durability of a con¬ veyor belt (1) of a strand sintering furnace, said conveyor belt being formed from a number of rectangu¬ lar steel plate elements (2) that are sequentially welded to each other by weld seams (3) , each plate el¬ ement (2) including a plurality of holes (4) arranged into a plurality of groups (5) of perforations to ena- ble the flow-through of the gas used in the sintering process, c h a r a c t e r i z e d in that the conveyor belt (1) is treated to create compressive residual stresses at a surface of the conveyor belt at least in critical regions which are susceptible to fatigue breakage.
2. The method according to claim 1, c h a r a c t e r i z e d in that the conveyor belt (1) is treated to create compressive residual stresses at the surface of the conveyor belt in regions of the groups (5) of per¬ forations .
3. The method according to claim 1 or 2, c h a r a c ¬ t e r i z e d in that the conveyor belt (1) is treated to create compressive residual stresses at the surface of the conveyor belt in regions of the weld seams (3) .
4. The method according to any of claims 1 to 3, c h a r a c t e r i z e d in that the surface on outer side of the conveyor belt (1), which outer surface, in operation, is repeatedly subjected to tensile stress, is treated to create the compressive residual stresses on the outer side of the conveyor belt.
5. The method according to any of claims 1 to 3, c h a r a c t e r i z e d in that the surfaces of both sides of the conveyor belt (1) are treated to create the compressive residual stresses on both sides of the conveyor belt.
6. The method according to any of claims 1 to 5, c h a r a c t e r i z e d in that the conveyor belt
(1) is treated to create compressive residual stresses substantially only in the regions of groups of perfora¬ tions (5) and in the regions of the weld seams (3) , while other areas of the conveyor belt are left un- treated.
7. The method according to any of claims 1 to 6, c h a r a c t e r i z e d in that the treatment to create compressive residual stresses is implemented by shot peening, ultrasonic hammering, laser shock peening, etc..
8. The method according to any of claims 1 to 7, c h a r a c t e r i z e d in that the conveyor belt (1) is treated in a flat form to create said compressive residual stresses; the free ends of the conveyor belt are welded together by an installation weld seam to form the conveyor belt into an endless loop form, and thereafter the installation weld seam is treated to create compressive residual stresses in the region of the installation weld seam.
9. A conveyor belt (1) of a strand sintering furnace, the conveyor belt being formed from a number of rec- tangular steel plate elements (2) that are sequential¬ ly welded to each other by weld seams (3) , each plate element (2) including a plurality of holes (4) ar¬ ranged into a plurality of groups (5) of perforations to enable the flow-through of the gas used in the sin- tering process, c h a r a c t e r i z e d in that the conveyor belt (1) includes compressive residual stress- es at a surface of the conveyor belt at least in criti¬ cal regions which are susceptible to fatigue breakage.
10. The conveyor belt according to claim 9, c h a r - a c t e r i z e d in that the conveyor belt (1) includes compressive residual stresses at the surface of the conveyor belt in the regions of the groups (5) of the perforations .
11. The conveyor belt according to claim 9 or 10, c h a r a c t e r i z e d in that the conveyor belt (1) includes compressive residual stresses at the surface of the conveyor belt in the regions of the weld seams (3) .
12. The conveyor belt according to any of claims 9 to
11, c h a r a c t e r i z e d in that the material of the conveyor belt (1) is chosen from stainless steel grades including: ferritic chromium-alloyed stainless steel, austenitic-martensitic precipitation hardened stainless steel, austenitic stainless steel, austenitic-ferritic duplex stainless steel.
13. The conveyor belt according to any of claims 9 to
12, c h a r a c t e r i z e d in that each plate element (2) comprises two long edges (6, 7) in the lateral di¬ rection (y) of the conveyor belt, which are parallel to and spaced from each other, the long edge of a similar adjacent second plate element being connected to each long edge (6, 7), and two short edges (8, 9) in the longitudinal direction (x) of the conveyor belt, which are spaced from each other by a distance corresponding to the width (L) of the conveyor belt.
14. The conveyor belt according to any of claims 9 to
13, c h a r a c t e r i z e d in that the groups (5) of perforations are rectangular and elongated, extending in the direction of the conveyor belt, the groups (5) of perforations being parallel to each other and spaced from each other by a first imperforated area (10) .
15. The conveyor belt according to claim 14, ch a r a c t e r i z e d in that the groups (5) of perfora¬ tions are subdivided into a number of subgroups (5') of perforations spaced from each other by a second im¬ perforated area (11) .
PCT/FI2013/050971 2012-10-09 2013-10-07 Method for enhancing fatigue durability of a conveyor belt of a strand sintering furnace, and conveyor belt Ceased WO2014057170A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
AU2013328502A AU2013328502B2 (en) 2012-10-09 2013-10-07 Method for enhancing fatigue durability of a conveyor belt of a strand sintering furnace, and conveyor belt
SE1550426A SE1550426A1 (en) 2012-10-09 2013-10-07 Method for enhancing fatigue durability of a conveyor belt of a beach sintering furnace, and conveyor belt
BR112015007803A BR112015007803A2 (en) 2012-10-09 2013-10-07 method for increasing the fatigue life of a conveyor belt of a series sintering furnace, and conveyor belt.
CN201380052663.1A CN104812685B (en) 2012-10-09 2013-10-07 For improving the method for fatigue durability and the conveyer belt of the conveyer belt of belt sintering stove
CA2885307A CA2885307C (en) 2012-10-09 2013-10-07 Method for enhancing fatigue durability of a conveyor belt of a strand sintering furnace, and conveyor belt
EA201590513A EA028479B1 (en) 2012-10-09 2013-10-07 Method for enhancing fatigue durability of a conveyor belt of a strand sintering furnace, and conveyor belt
ZA2015/03137A ZA201503137B (en) 2012-10-09 2015-05-07 Method for enhancing fatigue durability of a conveyor belt of a strand sintering furnace, and conveyor belt

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20126061A FI124911B (en) 2012-10-09 2012-10-09 Method for raising the fatigue strength of a conveyor belt of a belt sintering furnace, and conveyor belt
FI20126061 2012-10-09

Publications (1)

Publication Number Publication Date
WO2014057170A1 true WO2014057170A1 (en) 2014-04-17

Family

ID=50476973

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2013/050971 Ceased WO2014057170A1 (en) 2012-10-09 2013-10-07 Method for enhancing fatigue durability of a conveyor belt of a strand sintering furnace, and conveyor belt

Country Status (9)

Country Link
CN (1) CN104812685B (en)
AU (1) AU2013328502B2 (en)
BR (1) BR112015007803A2 (en)
CA (1) CA2885307C (en)
EA (1) EA028479B1 (en)
FI (1) FI124911B (en)
SE (1) SE1550426A1 (en)
WO (1) WO2014057170A1 (en)
ZA (1) ZA201503137B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017127244A1 (en) * 2016-01-19 2017-07-27 Laitram, L.L.C. Conveyor belt and module with skewed air-flow passages
WO2019036737A1 (en) * 2017-08-24 2019-02-28 Berndorf Band Gmbh METHOD FOR PRODUCING A FINAL STRIP WITH A TAPE BODY AT LEAST ONE DUPLEX STAINLESS STEEL
DE102020103452B3 (en) * 2020-02-11 2021-04-22 Bernd Münstermann Gmbh & Co. Kg Conveyor belt segment of a slat conveyor belt, slat conveyor belt and method for manufacturing a conveyor belt segment
WO2021160586A1 (en) * 2020-02-11 2021-08-19 Bernd Münstermann Gmbh & Co. Kg Plate conveyor belt for transporting a material web which is to be continuously thermally treated using a gaseous temperature-control medium, and furnace comprising at least one plate conveyor belt

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2073775A (en) * 1980-04-03 1981-10-21 Nisshin Steel Co Ltd Metallic conveyor belt and process for producing the same
WO2001055659A1 (en) * 2000-01-31 2001-08-02 Outokumpu Oyj Belt for the thermal treatment of a continuously operated material bed
US20020042977A1 (en) * 2000-10-13 2002-04-18 Toyota Jidosha Kabushiki Kaisha Method and apparatus for manufacturing endless metallic belt, and the endless metallic belt manufactured by the method
US20030085257A1 (en) * 2001-11-02 2003-05-08 The Boeing Company Apparatus and method for forming weld joints having compressive residual stress patterns
WO2009022059A1 (en) * 2007-08-15 2009-02-19 Outotec Oyj Conveyor belt and a method of repairing the conveyor belt

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1233501C (en) * 2002-05-22 2005-12-28 中国科学院金属研究所 Method of eliminating welding residual stress by low temperature compression deformation treatment
CN102601167A (en) * 2012-03-23 2012-07-25 天津大学 Ultrasonic shot blasting method for correcting weld buckling deformation of thin plate and application of ultrasonic shot blasting method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2073775A (en) * 1980-04-03 1981-10-21 Nisshin Steel Co Ltd Metallic conveyor belt and process for producing the same
WO2001055659A1 (en) * 2000-01-31 2001-08-02 Outokumpu Oyj Belt for the thermal treatment of a continuously operated material bed
US20020042977A1 (en) * 2000-10-13 2002-04-18 Toyota Jidosha Kabushiki Kaisha Method and apparatus for manufacturing endless metallic belt, and the endless metallic belt manufactured by the method
US20030085257A1 (en) * 2001-11-02 2003-05-08 The Boeing Company Apparatus and method for forming weld joints having compressive residual stress patterns
WO2009022059A1 (en) * 2007-08-15 2009-02-19 Outotec Oyj Conveyor belt and a method of repairing the conveyor belt

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WITHERS, P.J. ET AL.: "Residual Stress and its Role in Failure", REPORTS ON PROGRESS IN PHYSICS, vol. 70, 2007, pages 2211 - 2264 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017127244A1 (en) * 2016-01-19 2017-07-27 Laitram, L.L.C. Conveyor belt and module with skewed air-flow passages
US10543987B2 (en) 2016-01-19 2020-01-28 Laitram, L.L.C. Conveyor belt and module with skewed air-flow passages
WO2019036737A1 (en) * 2017-08-24 2019-02-28 Berndorf Band Gmbh METHOD FOR PRODUCING A FINAL STRIP WITH A TAPE BODY AT LEAST ONE DUPLEX STAINLESS STEEL
DE102020103452B3 (en) * 2020-02-11 2021-04-22 Bernd Münstermann Gmbh & Co. Kg Conveyor belt segment of a slat conveyor belt, slat conveyor belt and method for manufacturing a conveyor belt segment
WO2021160591A1 (en) 2020-02-11 2021-08-19 Bernd Münstermann Gmbh & Co. Kg Conveyor belt segment of a plate conveyor, plate conveyor and method for producing a conveyor belt segment
WO2021160586A1 (en) * 2020-02-11 2021-08-19 Bernd Münstermann Gmbh & Co. Kg Plate conveyor belt for transporting a material web which is to be continuously thermally treated using a gaseous temperature-control medium, and furnace comprising at least one plate conveyor belt
US12287148B2 (en) 2020-02-11 2025-04-29 Bernd Münstermann Gmbh & Co. Kg Plate conveyor belt for transporting a material web which is to be continuously thermally treated using a gaseous tempering medium, and furnace comprising at least one plate conveyor belt

Also Published As

Publication number Publication date
CN104812685B (en) 2017-03-08
CA2885307C (en) 2017-03-07
CN104812685A (en) 2015-07-29
FI20126061L (en) 2014-04-10
FI124911B (en) 2015-03-31
EA028479B1 (en) 2017-11-30
AU2013328502B2 (en) 2016-04-21
ZA201503137B (en) 2016-01-27
AU2013328502A1 (en) 2015-04-02
SE1550426A1 (en) 2015-04-09
CA2885307A1 (en) 2014-04-17
EA201590513A1 (en) 2015-09-30
BR112015007803A2 (en) 2017-07-04

Similar Documents

Publication Publication Date Title
WO2014057170A1 (en) Method for enhancing fatigue durability of a conveyor belt of a strand sintering furnace, and conveyor belt
CN102365375B (en) Method for producing partially hardened steel components
US10786873B2 (en) Fillet arc welded joint and method for producing same
JP2008274433A (en) Method and apparatus for continuous heat treatment of long bar by induction heating
CN108369069A (en) Trolleys for conveying loose material for heat treatment
US20150027601A1 (en) Cooling element with spacer
CN104520060A (en) Method of welding two edges of one or more steel components to each other, including a heat treatment step after the welding step: pressure pipes obtained by this method
JP6265267B2 (en) Heat treatment rail manufacturing method and manufacturing apparatus
CN106337111B (en) A kind of surface reinforcing method based on heat radiation and laser impact intensified combination
JP6780932B2 (en) Chain manufacturing equipment and chain manufacturing method
CN101476092A (en) Temperature changing stress shot blasting method for metallic material
KR101869576B1 (en) Process and furnace for treating workpieces
JP5763036B2 (en) Manufacturing method of steel product having fine ferrite grain boundary precipitation type martensite structure
KR101639906B1 (en) Hot Press Formed Part Having Strength-gradient and Manufacturing Method Thereof
CN105296727B (en) The product as made of multiple Component compositions
KR101611365B1 (en) Sealing Flap for air prevention
JP6778935B1 (en) Mesh belt
RU2251647C1 (en) Grate for screen and method of its manufacturing
JP6175101B2 (en) Steel products with fine ferrite grain boundary precipitation type martensite structure
WO2016062654A1 (en) Belt for the thermal treatment of a continuously operated material bed with optimized perforations
JP4586593B2 (en) Steel pipe cooling method
JP4512564B2 (en) Special steel for sinter cake support stand
KR20170113134A (en) Steel materials for construction
KR200480437Y1 (en) Link chain using for continuous unloader
RU2318170C2 (en) Fire grate

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13845104

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2885307

Country of ref document: CA

ENP Entry into the national phase

Ref document number: 2013328502

Country of ref document: AU

Date of ref document: 20131007

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 201590513

Country of ref document: EA

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13845104

Country of ref document: EP

Kind code of ref document: A1

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112015007803

Country of ref document: BR

ENP Entry into the national phase

Ref document number: 112015007803

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20150408