Apparatus for the Continuous Hot Dip Coating of a Metal Strip, and associated Method

Patent metadata

Field	Value
Publication number	US-2019062888-A1
Application number	US-201716171140-A
Country	US
Kind code	A1
Filing date	Oct 25, 2018
Priority date	Apr 26, 2016
Publication date	Feb 28, 2019
Grant date	—

Abstract

An apparatus for the continuous hot dip coating of a metal strip is provided. The apparatus includes a vessel intended to contain a liquid metal bath, a bottom roller and a scroll casing of the metal strip. The casing includes, at its lower end, a pouring box delimiting a front pouring compartment for liquid metal and a rear pouring compartment for liquid metal. Each pouring compartment is inwardly delimited by an inner wall and outwardly delimited by an outer wall. The outer wall of the rear pouring compartment forms, with the passage plane of the metal strip, an angle greater than or equal to 15° in the usage configuration. A method is also provided.

First claim

1 - 24 . (canceled)

25 . An apparatus for continuous hot dip coating of a metal strip, comprising:
a vessel having a liquid metal bath; a bottom roller arranged in the vessel, the bottom roller for immersing in the liquid metal bath; a displacement casing for the metal strip having a lower end for immersing in the liquid metal bath to define a liquid metal seal with a surface of the liquid metal bath and an inside of the displacement casing; the displacement casing including a pouring box at the lower end, the pouring box delimiting a front pouring compartment for liquid metal located on a first side of the metal strip, the front pouring compartment facing a first face of the metal strip which faces the bottom roller, and a rear pouring compartment for liquid metal located on a second side of the metal strip, the rear pouring competent facing a second face of the metal strip which does not face bottom roller, the front and rear pouring compartments being inwardly delimited by an inner wall and outwardly delimited by an outer wall, the inner wall including an upper rim below the liquid metal seal to produce a flow from the liquid metal seal into each of the front and rear pouring compartments, the outer wall of the rear pouring compartment and a passage plane of the metal strip configured to form an angle, the angle being greater than or equal to 15° in a usage configuration.

26 . The apparatus as recited in claim 25 , wherein the outer wall of the rear pouring compartment is vertical in the usage configuration.

27 . The apparatus as recited in claim 25 , wherein the inner wall of the rear pouring compartment is angled to move away from a vertical plane passing through the upper rim, from the upper rim toward a bottom of the rear pouring compartment.

28 . The apparatus as recited in claim 25 , wherein the inner wall of the rear pouring compartment and a vertical plane form an angle, the angle being greater than or equal to 15° in the usage configuration.

29 . The apparatus as recited in claim 25 , wherein the inner wall of the front pouring compartment and a vertical plane form an angle, the angle being greater than or equal to 15° in the usage configuration.

30 . The apparatus as recited in claim 25 , wherein the inner wall of the front pouring compartment and a vertical plane form an angle in the usage configuration greater than an angle formed between the passage plane of the metal strip and the vertical plane.

31 . The apparatus as recited in claim 25 , wherein the inner walls of the front and rear pouring compartments are tapered at the upper rims.

32 . The apparatus as recited in claim 25 , wherein the displacement casing includes an upper portion and a lower portion, the lower portion including the pouring box, the displacement casing with the pouring box being rotatable relative to the metal strip around a first rotation axis and the pouring box being rotatable relative to the upper portion of the displacement casing around a second rotation axis.

33 . The apparatus as recited in claim 32 , wherein an articulation allowing the rotation of the pouring box relative to the upper portion of the displacement casing is a pivot link.

34 . The apparatus as recited in claim 25 , further comprising:
an adjustment device for adjusting a horizontality of the upper rims of the inner walls of the front and rear pouring compartments.

35 . The apparatus as recited in claim 32 , wherein the pouring box is stationary relative to the lower portion of the displacement casing and the lower portion of the displacement casing is mounted rotatable around the second rotation axis on the upper portion of the displacement casing.

36 . The apparatus as recited in claim 32 , wherein the pouring box is rotatably mounted to rotate on the lower portion of the displacement casing.

37 . A method for continuous hot dip coating of a metal strip comprising the step of:
providing the coating apparatus as recited in claim 25 ; and depositing a coating on the metal strip.

38 . The coating method as recited in claim 37 , wherein the coating includes zinc and aluminum.

39 . The coating method as recited in in claim 37 , wherein the coating is a zinc-based coating.

40 . The coating method as recited in claim 39 , wherein the zinc-based coating includes between 0.1 and 0.3% aluminum.

41 . The coating method as recited in claim 39 , wherein the zinc-based coating includes 5% aluminum and a remainder is zinc.

42 . The coating method as recited in claim 39 , wherein the zinc-based coating includes magnesium.

43 . The coating method as recited in claim 37 , wherein the coating is an aluminum-based coating including silicon and iron.

44 . The coating method as recited in claim 37 , wherein during the coating of the metal strip, the outer wall of the rear pouring compartment and the metal strip form an angle greater than or equal to 15°.

45 . The coating method as recited in claim 37 , wherein during the coating of the metal strip, the inner wall of the rear pouring compartment is angled to move away from a vertical plane passing through the upper rim, from the upper rim toward the bottom of the rear pouring compartment.

46 . The coating method as recited in claim 37 , wherein during the coating of the metal strip, the inner wall of the rear pouring compartment and a vertical plane form an angle greater than or equal to 15°.

47 . The coating method as recited in claim 37 , wherein during the coating of the metal strip, the inner wall of the front pouring compartment and the vertical plane form an angle greater than or equal to 15°.

48 . The coating method as recited in claim 37 , wherein the inner wall of the front pouring compartment and a vertical plane form, in the usage configuration, an angle strictly greater than an angle formed between the metal strip and the vertical plane.

49 . The coating method as recited in claim 38 , wherein the coating is an aluminum-zinc coating.

50 . The coating method as recited in claim 38 , wherein the coating includes 55 wt % of aluminum, 43.5 wt % of zinc and 1.5 wt % of silicon.

51 . The coating method as recited in claim 43 , wherein the coating includes, in wt %:
8%≤Si≤11%; and
2%≤Fe≤4%;
a remainder being aluminum and any impurities.

52 . The coating method as recited in claim 42 , wherein the zinc-based coating includes aluminum.

53 . The coating method as recited in claim 52 , wherein the zinc-based coating includes from 0.1 to 20 wt % of aluminum and from 0.1 to 10 wt % of magnesium.

Assignees

• Arcelormittal

Inventors

• Saint-Raymond Hubert
• Veg José
• Dauchelle Didier

Classifications

• C22C21/02

  with silicon as the next major constituent · CPC title

• C22C21/10

  with zinc as the next major constituent · CPC title

• C23C2/40

  Plates; Strips · CPC title

• C23C2/12

  Aluminium or alloys based thereon · CPC title

• C22C18/04

  with aluminium as the next major constituent · CPC title