US20190388963A1 - Apparatus for making thin floor plate and a thin floor plate - Google Patents
Apparatus for making thin floor plate and a thin floor plate Download PDFInfo
- Publication number
- US20190388963A1 US20190388963A1 US16/562,914 US201916562914A US2019388963A1 US 20190388963 A1 US20190388963 A1 US 20190388963A1 US 201916562914 A US201916562914 A US 201916562914A US 2019388963 A1 US2019388963 A1 US 2019388963A1
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- floor plate
- casting
- pattern
- rolls
- pair
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 45
- 239000002184 metal Substances 0.000 claims abstract description 45
- 238000005098 hot rolling Methods 0.000 claims abstract description 15
- 238000005266 casting Methods 0.000 abstract description 88
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 238000009864 tensile test Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000003670 easy-to-clean Effects 0.000 description 2
- 238000009408 flooring Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 239000012768 molten material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/02—Flooring or floor layers composed of a number of similar elements
- E04F15/02161—Floor elements with grooved main surface
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/02—Flooring or floor layers composed of a number of similar elements
- E04F15/06—Flooring or floor layers composed of a number of similar elements of metal, whether or not in combination with other material
Definitions
- This invention relates to the method for making thin quality floor plate.
- Steel floor plates have a wide range of useful applications, including: construction, public and private walkways, ramps, and stair treads. Steel floor plates should be sturdy and rugged providing impact resistance and feature treading to prevent slips and falls.
- floor plates have been relatively thick with a relatively high slip-resistant pattern to inhibit slips by users trafficking the floor plates. The effort has been to make floor plates that are thinner (and in turn much less expensive) yet are sufficiently sturdy and moveable and provide a such raised slip-resistant pattern to be effective in use.
- molten metal is introduced between a pair of counter-rotated, internally cooled casting rolls so that metal shells solidify on the moving roll surfaces, and are brought together at the nip between them to produce a solidified strip product, delivered downwardly from the nip between the casting rolls.
- the term “nip” is used herein to refer to the general region at which the casting rolls are closest together.
- the molten metal is poured from a ladle through a metal delivery system comprised of a tundish and a core nozzle located above the nip to form a casting pool of molten metal, supported on the casting surfaces of the rolls above the nip and extending along the length of the nip.
- This casting pool is usually confined between refractory side plates or dams held in sliding engagement with the end surfaces of the rolls so as to dam the two ends of the casting pool against outflow.
- a method for making floor plate comprising: (a) assembling a pair of casting rolls laterally disposed to form a nip between them with side dams at the end portions of the casting rolls adapted to maintain a molten metal pool supported above the nip by the casting rolls; (b) assembling a hot rolling mill downstream of the nip having work rolls with a pattern thereon forming the negative of a raised slip-resistant pattern desired in a floor plate between 0.3 and 0.7 mm in height; (c) introducing molten metal from a metal delivery system through at least one elongated metal delivery nozzle to form a casting pool supported on the casting rolls above the nip; (d) counter rotating the casting rolls to form shells on the casting surfaces of the casting rolls brought together at the nip to cast metal strip of less than 2.2 mm thickness downwardly from the nip; and (e) delivering the cast metal strip to and through the hot rolling mill to form by the negative of the slip-resistant pattern on the work rolls
- FIG. 1 is a diagrammatical side view of twin roll caster system employing the present twin roll caster.
- FIG. 2 is a partial sectional view through the casting rolls mounted in a roll cassette in the casting position of the caster system of FIG. 1 .
- FIG. 3A is a micrograph of the base material of a floor plate.
- FIG. 3B is a micrograph of the lug of a floor plate.
- FIG. 4 is a top view of a section of floor plate subjected to tensile testing.
- FIG. 5A is a side view of a floor plate subjected to a hem (zero ‘T’) bend.
- FIG. 5B is an end view of a floor plate subjected to a greater than 90° bend.
- FIG. 5C is an end view of a floor plate subjected to a 90° bend.
- a twin roll caster system for continuously casting thin steel strip is comprised of a main machine frame 10 that stands up from the factory floor and supports a roll cassette module 11 with a pair of counter-rotatable casting rolls 12 mounted thereon.
- the casting rolls 12 have shaft portions (not shown) and casting surfaces 12 A laterally positioned to form a nip 18 there between.
- the casting rolls 12 are mounted on the roll cassette 11 for ease of operation and movement of the casting rolls.
- the roll cassette facilitates movement of the casting rolls 12 ready for casting from a setup position to an operative casting position in the caster as a unit, and ready removal of the casting rolls 12 from the casting position when the casting rolls are to be replaced.
- the roll cassette have a desired configuration to perform that functions of set up, movement and operation of the casting rolls in the casting position in the twin roll caster.
- Molten metal is supplied from a ladle 13 through a metal delivery system, with a movable tundish 14 and a transition piece or distributor 16 . From the distributor 16 , the molten metal is delivered to at least one metal delivery nozzle 17 , or core nozzle, positioned between the casting rolls 12 above the nip 18 . Molten metal discharged from the delivery nozzle 17 forms casting pool 19 of molten metal above the nip 18 supported on the casting surfaces 12 A of the casting rolls 12 . The casting pool 19 is confined on the casting rolls by side closures or side dams 20 (shown in dotted line in FIG. 2 ) positioned against the ends of the casting rolls 12 .
- the upper surface of the casting pool 19 (generally referred to as the “meniscus” level) generally rises above the lower portions of delivery nozzle 17 so that the lower part of the delivery nozzle 17 is immersed in the casting pool 19 .
- the casting area above the casting pool 19 provides a protective atmosphere to inhibit oxidation of the molten metal in the casting pool.
- the ladle 13 typically is of a conventional construction supported on a rotating turret 40 .
- the ladle 13 is positioned above a movable tundish 14 positioned adjacent the casting area to fill the tundish with molten metal.
- the movable tundish 14 may be positioned on a tundish car 66 capable of transferring the tundish from a heating station (not shown), where the tundish is heated to near a casting temperature, to the casting position.
- a tundish guide such as rails, may be positioned beneath the tundish car 66 to enable moving the movable tundish 14 from the heating station to the casting position.
- the movable tundish 14 may be fitted with a slide gate 25 , actuable by a servo mechanism, to allow molten metal to flow from the tundish 14 through the slide gate 25 , and then through a refractory outlet shroud 15 to a transition piece or distributor 16 in the casting position. From the distributor 16 , the molten metal flows to the delivery nozzle 17 positioned between the casting rolls 12 above the nip 18 .
- the casting rolls 12 are internally water cooled and the casting rolls 12 are counter-rotated to solidify metal shells on the casting surfaces 12 A as the casting surfaces 12 A move into and through the casting pool 19 with each revolution of the casting rolls 12 .
- the shells formed on the casting surfaces 12 A are brought together at the nip 18 between the casting rolls 12 to form a solidified thin cast strip product 21 delivered downwardly from the nip 18 .
- FIG. 1 shows the twin roll caster producing thin cast strip 21 , which passes across a guide table 30 to a pinch roll stand 31 , comprising pinch rolls 31 A.
- the thin cast strip pass through a hot rolling mill 32 , comprising a pair of work rolls 32 A with backup rolls 32 B, forming a gap adapted to hot roll the cast strip delivered from the casting rolls, where the cast strip is reduced to a desired thickness, and improve the strip surface and the strip flatness.
- the work surfaces of the work rolls 32 A have negative patterns of the desired slip-resistant pattern on the floor plates to be produced.
- the hot rolled cast strip then passes onto a run-out table 33 , where it may be cooled by contact with a coolant, such as water, supplied via water jets 90 or other suitable means, and/or by convection and radiation.
- a coolant such as water
- the hot rolled cast strip may then pass through a second pinch roll stand 91 having rollers 91 A to provide tension on the cast strip, and then to a coiler 92 .
- a short length of imperfect strip is typically produced as casting conditions stabilize.
- the casting rolls are moved apart slightly and then brought together again to cause the leading end of the cast strip to break away forming a clean head end of the cast strip to follow.
- the imperfect material drops into a scrap receptacle 26 , which is movable on a scrap receptacle guide.
- the scrap receptacle 26 is located in a scrap receiving position beneath the caster and forms part of a sealed enclosure 27 as described below.
- the enclosure 27 is typically water cooled.
- water-cooled apron 28 normally hangs downwardly from a pivot 29 to one side in the enclosure 27 and is swung into position to guide the clean end of the cast strip 21 onto the guide table 30 and feed the strip to the pinch roll stand 31 .
- the apron 28 is then retracted back to its hanging position to cause the cast strip 21 to hang in a loop beneath the casting rolls in enclosure 27 before it passes onto the guide table 30 where it engages a succession of guide rollers.
- An overflow container 38 may be provided beneath the movable tundish 14 to receive molten material that may spill from the tundish. As shown in FIG. 1 , the overflow container 38 may be movable on rails 39 or another guide such that the overflow container 38 is placed beneath the movable tundish 14 as desired in casting locations. Additionally, an overflow container (not shown) may be provided adjacent the distributor 16 .
- the sealed enclosure 27 is formed by a number of separate wall sections that assembled together with sealed connections to form a continuous enclosure wall that permits control of the atmosphere within the enclosure during casting. Additionally, the scrap receptacle 26 may be capable of attaching to the enclosure 27 so that the enclosure to provide a protective atmosphere immediately beneath the casting rolls 12 in the casting position.
- the enclosure 27 includes an opening in the lower portion of the enclosure, lower enclosure portion 44 , providing an outlet for scrap to pass from the enclosure 27 into the scrap receptacle 26 in the scrap receiving position.
- the lower enclosure portion 44 may extend downwardly as a part of the enclosure 27 , the opening being positioned above the scrap receptacle 26 in the scrap receiving position.
- “seal,” “sealed,” “sealing,” and “sealingly” in reference to the scrap receptacle 26 , enclosure 27 , and related features may not be a complete seal so as to prevent leakage, but rather is usually provides less than perfect seal to allow control and support of the atmosphere within the enclosure as desired with some tolerable leakage.
- a rim portion 45 may surround the opening of the lower enclosure portion 44 and may be movably positioned above the scrap receptacle, capable of sealingly engaging and/or attaching to the scrap receptacle 26 in the scrap receiving position.
- the rim portion 45 may be movable between a sealing position in which the rim portion engages the scrap receptacle, and a clearance position in which the rim portion 45 is disengaged from the scrap receptacle.
- the caster or the scrap receptacle may include a lifting mechanism to raise the scrap receptacle into sealing engagement with the rim portion 45 of the enclosure, and then lower the scrap receptacle into the clearance position.
- the enclosure 27 and scrap receptacle 26 are filled with a desired gas, such as nitrogen, to reduce the amount of oxygen in the enclosure to generally less than 5% and provide a protective atmosphere during casting of strip.
- the enclosure 27 may include an upper collar portion supporting a protective atmosphere immediately beneath the casting rolls in the casting position.
- the upper collar portion 27 A is moved to the extended position closing the space between a housing portion adjacent the casting rolls 12 , as shown in FIG. 2 , and the enclosure 27 .
- the upper collar portion may be provided within or adjacent the enclosure 27 and adjacent the casting rolls, and may be moved by a plurality of actuators (not shown) such as servo-mechanisms, hydraulic mechanisms, pneumatic mechanisms, and rotating actuators.
- a method for making floor plate may comprise the following steps: (a) assembling a pair of casting rolls laterally disposed to form a nip between with side dams at the ends of the casting rolls to maintain a molten metal pool supported above the nip by the casting rolls; (b) assembling a hot rolling mill downstream of the nip having work rolls with a pattern thereon forming the negative of a raised slip-resistant pattern desired in a floor plate between 0.3 and 0.7 mm in height; (c) introducing molten metal from a metal delivery system through an elongated metal delivery nozzle to form a casting pool supported on the casting rolls above the nip; (d) counter rotating the casting rolls so as to form shells on the casting surfaces of the casting rolls brought together at the nip to cast metal strip of preferably less than 2.2 mm thickness downwardly from the nip; and (e) delivering the cast metal strip to and through the hot rolling mill to form by the negative on the work rolls of the slip-resistant pattern desired in the
- the delivered cast metal strip may be such as to provide floor plate greater than 0.7 or greater the 1.0 mm in thickness.
- the delivered cast metal strip may be silicon killed such as to provide a floor plate with less than 0.008 aluminum.
- the floor plate of the current disclosure may contain a total oxygen content of greater than 50 ppm.
- the slip resistant pattern form in the floor plate may be ASTM A786M-2004, pattern 4.
- ASTM A786M covers carbon high-strength, low-alloyed and alloyed steel plate intended for flooring, stairs, transport equipment and other purposes.
- Steel plate under ASTM A786M shall be manufactured lenticular-riffled.
- ASTM A786 Steel Floor Plate has a raised diamond lug pattern that provides excellent skid resistance for a wide range of applications commonly used in stairs, walkways, ramps and entrances where ‘rough’ or ‘high-wear’ surfaces are preferred.
- A786 floor plate is available as 4-Way patterned plates, which provide maximum skid resistance with an easy to clean surface.
- A786 4-Way floor plates may be used for safety flooring on docks, ramps, mezzanines, stair treads catwalks, trench covers, walkways, ornamental projects and other surfaces that require skid resistance with an easy to clean surface.
- the floor plate may have a density between 2.0 and 2.2 lbs./ft. 2 . In other embodiments, the floor plate may have a density of between 2.5 and 2.7 lbs./ft. 2 .
- FIGS. 3A and 3B micrographs of base material and lugs of a floor plate taken on longitudinal/transverse directions for plates of 0.043 inches and 0.061 inches in thickness.
- FIG. 4 An exemplary section of floor plate subjected to tensile testing, where two necking regions, 1 and 2 , are seen, as compared to a flat cast strip without lugs, which generally forms one necking region under tensile testing. It is believed that the lugs provide for uneven strain across the testing area and allow for multiple necking regions.
- FIG. 5A There is shown in FIG. 5A a floor plate subjected to a hem (zero ‘T’) bend.
- FIG. 5B There is shown in FIG. 5B a floor plate subjected to a greater than 90° bend.
- FIG. 5C There is shown in FIG. 5C a floor plate subjected to a 90° bend.
- FIGS. 5A,5B and 5C demonstrate that the floor plate of the present disclosure exhibits excellent ductility.
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- Metal Rolling (AREA)
- Floor Finish (AREA)
Abstract
Description
- This patent application is a continuation of U.S. patent application Ser. No. 16/123,243 filed on Sep. 6, 2018 which is a continuation of U.S. patent application Ser. No. 14/963,305 filed on Dec. 9, 2015, now U.S. Pat. No. 10,099,279, which claims priority to U.S. Provisional Application No. 62/094,920 filed Dec. 19, 2014, which are all incorporated herein by reference.
- This invention relates to the method for making thin quality floor plate.
- Steel floor plates have a wide range of useful applications, including: construction, public and private walkways, ramps, and stair treads. Steel floor plates should be sturdy and rugged providing impact resistance and feature treading to prevent slips and falls. In the past, floor plates have been relatively thick with a relatively high slip-resistant pattern to inhibit slips by users trafficking the floor plates. The effort has been to make floor plates that are thinner (and in turn much less expensive) yet are sufficiently sturdy and moveable and provide a such raised slip-resistant pattern to be effective in use.
- In a twin roll caster, molten metal is introduced between a pair of counter-rotated, internally cooled casting rolls so that metal shells solidify on the moving roll surfaces, and are brought together at the nip between them to produce a solidified strip product, delivered downwardly from the nip between the casting rolls. The term “nip” is used herein to refer to the general region at which the casting rolls are closest together. The molten metal, is poured from a ladle through a metal delivery system comprised of a tundish and a core nozzle located above the nip to form a casting pool of molten metal, supported on the casting surfaces of the rolls above the nip and extending along the length of the nip. This casting pool is usually confined between refractory side plates or dams held in sliding engagement with the end surfaces of the rolls so as to dam the two ends of the casting pool against outflow.
- Presently disclosed is a method for making floor plate comprising: (a) assembling a pair of casting rolls laterally disposed to form a nip between them with side dams at the end portions of the casting rolls adapted to maintain a molten metal pool supported above the nip by the casting rolls; (b) assembling a hot rolling mill downstream of the nip having work rolls with a pattern thereon forming the negative of a raised slip-resistant pattern desired in a floor plate between 0.3 and 0.7 mm in height; (c) introducing molten metal from a metal delivery system through at least one elongated metal delivery nozzle to form a casting pool supported on the casting rolls above the nip; (d) counter rotating the casting rolls to form shells on the casting surfaces of the casting rolls brought together at the nip to cast metal strip of less than 2.2 mm thickness downwardly from the nip; and (e) delivering the cast metal strip to and through the hot rolling mill to form by the negative of the slip-resistant pattern on the work rolls a raised slip-resistant pattern of between 0.3 and 0.7 mm in height in a floor plate of less than 1.7 mm thickness. Further, the delivered cast metal strip may be such as to provide floor plate greater than 0.7 or greater than 1.0 mm in thickness. The delivered cast metal strip may be silicon killed such as to provide a floor plate with less than 0.008 aluminum.
- The accompanying drawings illustrate the invention in which:
-
FIG. 1 is a diagrammatical side view of twin roll caster system employing the present twin roll caster; and -
FIG. 2 is a partial sectional view through the casting rolls mounted in a roll cassette in the casting position of the caster system ofFIG. 1 . -
FIG. 3A is a micrograph of the base material of a floor plate. -
FIG. 3B is a micrograph of the lug of a floor plate. -
FIG. 4 is a top view of a section of floor plate subjected to tensile testing. -
FIG. 5A is a side view of a floor plate subjected to a hem (zero ‘T’) bend. -
FIG. 5B is an end view of a floor plate subjected to a greater than 90° bend. -
FIG. 5C is an end view of a floor plate subjected to a 90° bend. - Referring to
FIGS. 1 and 2 , a twin roll caster system for continuously casting thin steel strip is comprised of amain machine frame 10 that stands up from the factory floor and supports aroll cassette module 11 with a pair ofcounter-rotatable casting rolls 12 mounted thereon. Thecasting rolls 12 have shaft portions (not shown) andcasting surfaces 12A laterally positioned to form anip 18 there between. Thecasting rolls 12 are mounted on theroll cassette 11 for ease of operation and movement of the casting rolls. The roll cassette facilitates movement of thecasting rolls 12 ready for casting from a setup position to an operative casting position in the caster as a unit, and ready removal of thecasting rolls 12 from the casting position when the casting rolls are to be replaced. The roll cassette have a desired configuration to perform that functions of set up, movement and operation of the casting rolls in the casting position in the twin roll caster. - Molten metal is supplied from a
ladle 13 through a metal delivery system, with a movable tundish 14 and a transition piece ordistributor 16. From thedistributor 16, the molten metal is delivered to at least onemetal delivery nozzle 17, or core nozzle, positioned between thecasting rolls 12 above thenip 18. Molten metal discharged from thedelivery nozzle 17forms casting pool 19 of molten metal above thenip 18 supported on thecasting surfaces 12A of thecasting rolls 12. Thecasting pool 19 is confined on the casting rolls by side closures or side dams 20 (shown in dotted line inFIG. 2 ) positioned against the ends of thecasting rolls 12. The upper surface of the casting pool 19 (generally referred to as the “meniscus” level) generally rises above the lower portions ofdelivery nozzle 17 so that the lower part of thedelivery nozzle 17 is immersed in thecasting pool 19. The casting area above thecasting pool 19 provides a protective atmosphere to inhibit oxidation of the molten metal in the casting pool. - The
ladle 13 typically is of a conventional construction supported on a rotatingturret 40. For metal delivery, theladle 13 is positioned above amovable tundish 14 positioned adjacent the casting area to fill the tundish with molten metal. The movable tundish 14 may be positioned on atundish car 66 capable of transferring the tundish from a heating station (not shown), where the tundish is heated to near a casting temperature, to the casting position. A tundish guide, such as rails, may be positioned beneath thetundish car 66 to enable moving the movable tundish 14 from the heating station to the casting position. - The movable tundish 14 may be fitted with a
slide gate 25, actuable by a servo mechanism, to allow molten metal to flow from the tundish 14 through theslide gate 25, and then through arefractory outlet shroud 15 to a transition piece ordistributor 16 in the casting position. From thedistributor 16, the molten metal flows to thedelivery nozzle 17 positioned between thecasting rolls 12 above thenip 18. - The
casting rolls 12 are internally water cooled and thecasting rolls 12 are counter-rotated to solidify metal shells on thecasting surfaces 12A as thecasting surfaces 12A move into and through thecasting pool 19 with each revolution of thecasting rolls 12. The shells formed on thecasting surfaces 12A are brought together at thenip 18 between thecasting rolls 12 to form a solidified thincast strip product 21 delivered downwardly from thenip 18. -
FIG. 1 shows the twin roll caster producingthin cast strip 21, which passes across a guide table 30 to apinch roll stand 31, comprisingpinch rolls 31A. Upon exiting thepinch roll stand 31, the thin cast strip pass through a hot rollingmill 32, comprising a pair ofwork rolls 32A withbackup rolls 32B, forming a gap adapted to hot roll the cast strip delivered from the casting rolls, where the cast strip is reduced to a desired thickness, and improve the strip surface and the strip flatness. The work surfaces of thework rolls 32A have negative patterns of the desired slip-resistant pattern on the floor plates to be produced. The hot rolled cast strip then passes onto a run-out table 33, where it may be cooled by contact with a coolant, such as water, supplied viawater jets 90 or other suitable means, and/or by convection and radiation. In any event, the hot rolled cast strip may then pass through a secondpinch roll stand 91 havingrollers 91A to provide tension on the cast strip, and then to acoiler 92. - At the start of the casting campaign, a short length of imperfect strip is typically produced as casting conditions stabilize. After continuous casting is established, the casting rolls are moved apart slightly and then brought together again to cause the leading end of the cast strip to break away forming a clean head end of the cast strip to follow. The imperfect material drops into a
scrap receptacle 26, which is movable on a scrap receptacle guide. Thescrap receptacle 26 is located in a scrap receiving position beneath the caster and forms part of a sealedenclosure 27 as described below. Theenclosure 27 is typically water cooled. During casting, water-cooledapron 28 normally hangs downwardly from apivot 29 to one side in theenclosure 27 and is swung into position to guide the clean end of thecast strip 21 onto the guide table 30 and feed the strip to thepinch roll stand 31. Theapron 28 is then retracted back to its hanging position to cause thecast strip 21 to hang in a loop beneath the casting rolls inenclosure 27 before it passes onto the guide table 30 where it engages a succession of guide rollers. - An
overflow container 38 may be provided beneath the movable tundish 14 to receive molten material that may spill from the tundish. As shown inFIG. 1 , theoverflow container 38 may be movable onrails 39 or another guide such that theoverflow container 38 is placed beneath themovable tundish 14 as desired in casting locations. Additionally, an overflow container (not shown) may be provided adjacent thedistributor 16. - The sealed
enclosure 27 is formed by a number of separate wall sections that assembled together with sealed connections to form a continuous enclosure wall that permits control of the atmosphere within the enclosure during casting. Additionally, thescrap receptacle 26 may be capable of attaching to theenclosure 27 so that the enclosure to provide a protective atmosphere immediately beneath the casting rolls 12 in the casting position. Theenclosure 27 includes an opening in the lower portion of the enclosure,lower enclosure portion 44, providing an outlet for scrap to pass from theenclosure 27 into thescrap receptacle 26 in the scrap receiving position. Thelower enclosure portion 44 may extend downwardly as a part of theenclosure 27, the opening being positioned above thescrap receptacle 26 in the scrap receiving position. As used in the specification and claims herein, “seal,” “sealed,” “sealing,” and “sealingly” in reference to thescrap receptacle 26,enclosure 27, and related features may not be a complete seal so as to prevent leakage, but rather is usually provides less than perfect seal to allow control and support of the atmosphere within the enclosure as desired with some tolerable leakage. - A
rim portion 45 may surround the opening of thelower enclosure portion 44 and may be movably positioned above the scrap receptacle, capable of sealingly engaging and/or attaching to thescrap receptacle 26 in the scrap receiving position. Therim portion 45 may be movable between a sealing position in which the rim portion engages the scrap receptacle, and a clearance position in which therim portion 45 is disengaged from the scrap receptacle. Additionally, the caster or the scrap receptacle may include a lifting mechanism to raise the scrap receptacle into sealing engagement with therim portion 45 of the enclosure, and then lower the scrap receptacle into the clearance position. When sealed, theenclosure 27 andscrap receptacle 26 are filled with a desired gas, such as nitrogen, to reduce the amount of oxygen in the enclosure to generally less than 5% and provide a protective atmosphere during casting of strip. - The
enclosure 27 may include an upper collar portion supporting a protective atmosphere immediately beneath the casting rolls in the casting position. When the casting rolls 12 are in the casting position, theupper collar portion 27A is moved to the extended position closing the space between a housing portion adjacent the casting rolls 12, as shown inFIG. 2 , and theenclosure 27. The upper collar portion may be provided within or adjacent theenclosure 27 and adjacent the casting rolls, and may be moved by a plurality of actuators (not shown) such as servo-mechanisms, hydraulic mechanisms, pneumatic mechanisms, and rotating actuators. - A method for making floor plate may comprise the following steps: (a) assembling a pair of casting rolls laterally disposed to form a nip between with side dams at the ends of the casting rolls to maintain a molten metal pool supported above the nip by the casting rolls; (b) assembling a hot rolling mill downstream of the nip having work rolls with a pattern thereon forming the negative of a raised slip-resistant pattern desired in a floor plate between 0.3 and 0.7 mm in height; (c) introducing molten metal from a metal delivery system through an elongated metal delivery nozzle to form a casting pool supported on the casting rolls above the nip; (d) counter rotating the casting rolls so as to form shells on the casting surfaces of the casting rolls brought together at the nip to cast metal strip of preferably less than 2.2 mm thickness downwardly from the nip; and (e) delivering the cast metal strip to and through the hot rolling mill to form by the negative on the work rolls of the slip-resistant pattern desired in the floor plate between 0.3 and 0.7 mm of less than 1.7 mm thickness. Further, the delivered cast metal strip may be such as to provide floor plate greater than 0.7 or greater the 1.0 mm in thickness. The delivered cast metal strip may be silicon killed such as to provide a floor plate with less than 0.008 aluminum. Further the floor plate of the current disclosure may contain a total oxygen content of greater than 50 ppm.
- The slip resistant pattern form in the floor plate may be ASTM A786M-2004, pattern 4. ASTM A786M covers carbon high-strength, low-alloyed and alloyed steel plate intended for flooring, stairs, transport equipment and other purposes. Steel plate under ASTM A786M shall be manufactured lenticular-riffled. ASTM A786 Steel Floor Plate has a raised diamond lug pattern that provides excellent skid resistance for a wide range of applications commonly used in stairs, walkways, ramps and entrances where ‘rough’ or ‘high-wear’ surfaces are preferred. A786 floor plate is available as 4-Way patterned plates, which provide maximum skid resistance with an easy to clean surface. A786 4-Way floor plates may be used for safety flooring on docks, ramps, mezzanines, stair treads catwalks, trench covers, walkways, ornamental projects and other surfaces that require skid resistance with an easy to clean surface.
- The floor plate may have a density between 2.0 and 2.2 lbs./ft.2. In other embodiments, the floor plate may have a density of between 2.5 and 2.7 lbs./ft.2.
- There is shown in
FIGS. 3A and 3B micrographs of base material and lugs of a floor plate taken on longitudinal/transverse directions for plates of 0.043 inches and 0.061 inches in thickness. - Tensile testing was done on a series of floor plates for a range of differing base thicknesses ranging from 0.042 to 0.066 inches. The resulting tensile properties are represented in the table below:
-
Hardness % Heat Direction Thickness Top Bottom Tensile Elongation Yield 429582-1 trans 0.0661 62 67 59.618 21.057 40.471 429582-2 trans 0.0623 61 66 59.491 20.767 40.496 429582-3 trans 0.0612 62 65 59.306 17.944 41.068 429582-7 trans 0.0423 59 48 57.208 15.754 39.285 429586-2 trans 0.0461 56 37 50.037 16.085 34.564 429586-3 trans 0.0434 60 58 61.474 15.108 43.988 429586-5 trans 0.0544 61 70 58.31 20.091 42.013 429586-6 trans 0.0561 53 55 57.449 20.14 39.525 429586-6 long 0.0604 62 55 54.333 20.467 36.276 429586-8 trans 0.0508 56 56 58.024 15.968 41.032 429586-8 long 0.0491 60 55 57.851 14.882 40.168 - There is shown in
FIG. 4 an exemplary section of floor plate subjected to tensile testing, where two necking regions, 1 and 2, are seen, as compared to a flat cast strip without lugs, which generally forms one necking region under tensile testing. It is believed that the lugs provide for uneven strain across the testing area and allow for multiple necking regions. - There is shown in
FIG. 5A a floor plate subjected to a hem (zero ‘T’) bend. - There is shown in
FIG. 5B a floor plate subjected to a greater than 90° bend. - There is shown in
FIG. 5C a floor plate subjected to a 90° bend. -
FIGS. 5A,5B and 5C demonstrate that the floor plate of the present disclosure exhibits excellent ductility. - While the invention has been illustrated and described in detail in the foregoing drawings and description, the same is to be considered as illustrative and not restrictive in character, it being understood that only illustrative embodiments thereof have been shown and described, and that all changes and modifications that come within the spirit of the invention described by the following claims are desired to be protected. Additional features of the invention will become apparent to those skilled in the art upon consideration of the description. Modifications may be made without departing from the spirit and scope of the invention.
Claims (15)
Priority Applications (1)
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US16/562,914 US20190388963A1 (en) | 2014-12-19 | 2019-09-06 | Apparatus for making thin floor plate and a thin floor plate |
Applications Claiming Priority (4)
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US201462094920P | 2014-12-19 | 2014-12-19 | |
US14/963,305 US10099279B2 (en) | 2014-12-19 | 2015-12-09 | Method of making thin floor plate |
US16/123,243 US10434567B2 (en) | 2014-12-19 | 2018-09-06 | System for making thin floor plate |
US16/562,914 US20190388963A1 (en) | 2014-12-19 | 2019-09-06 | Apparatus for making thin floor plate and a thin floor plate |
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US16/123,243 Continuation US10434567B2 (en) | 2014-12-19 | 2018-09-06 | System for making thin floor plate |
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US20190388963A1 true US20190388963A1 (en) | 2019-12-26 |
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US14/963,305 Active US10099279B2 (en) | 2014-12-19 | 2015-12-09 | Method of making thin floor plate |
US16/123,243 Active US10434567B2 (en) | 2014-12-19 | 2018-09-06 | System for making thin floor plate |
US16/562,914 Pending US20190388963A1 (en) | 2014-12-19 | 2019-09-06 | Apparatus for making thin floor plate and a thin floor plate |
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US14/963,305 Active US10099279B2 (en) | 2014-12-19 | 2015-12-09 | Method of making thin floor plate |
US16/123,243 Active US10434567B2 (en) | 2014-12-19 | 2018-09-06 | System for making thin floor plate |
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US (3) | US10099279B2 (en) |
CN (1) | CN107249782B (en) |
GB (1) | GB2547608B (en) |
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US10815544B2 (en) * | 2018-04-06 | 2020-10-27 | Nucor Corporation | High friction rolling of thin metal strip |
CN112517863A (en) * | 2019-09-19 | 2021-03-19 | 宝山钢铁股份有限公司 | High-strength thin-specification patterned steel plate/belt and manufacturing method thereof |
CN113664169A (en) * | 2021-08-23 | 2021-11-19 | 山东理工大学 | Load static variable-opening roll gap for double-roll casting |
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Also Published As
Publication number | Publication date |
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GB201709283D0 (en) | 2017-07-26 |
US20190015894A1 (en) | 2019-01-17 |
SK602017A3 (en) | 2017-11-03 |
US20160175926A1 (en) | 2016-06-23 |
MX2017008028A (en) | 2017-10-20 |
MX2023003891A (en) | 2023-04-24 |
SK288912B6 (en) | 2021-11-24 |
WO2016100025A1 (en) | 2016-06-23 |
US10099279B2 (en) | 2018-10-16 |
SA517381766B1 (en) | 2021-07-14 |
CN107249782A (en) | 2017-10-13 |
UA122782C2 (en) | 2021-01-06 |
GB2547608A (en) | 2017-08-23 |
CN107249782B (en) | 2019-12-31 |
GB2547608B (en) | 2022-02-23 |
US10434567B2 (en) | 2019-10-08 |
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