Device and method for manufacturing metal clad strips continuously

Patent metadata

Field	Value
Publication number	US-11788167-B2
Application number	US-201917255869-A
Country	US
Kind code	B2
Filing date	Jan 14, 2019
Priority date	Jun 29, 2018
Publication date	Oct 17, 2023
Grant date	Oct 17, 2023

Abstract

The device and method for manufacturing metal clad strip continuously provided by the present invention, combines casting, rolling and heat treatment used for the single material manufacture with the continuous and large-scale manufacture method for the clad strip, greatly improves the productivity of clad strip. The present invention can be used for manufacturing single-sided or double-sided clad strips with different thickness specifications, wherein the base layer material or the clad layer material can be selected in a wide range, including carbon steel, stainless steel, special alloy steel, titanium, copper and the like. In the present application, continuous casting and rolling clad strip is implemented, which decrease the energy consumption and costs.

First claim

We claim:

1. A device comprising:
base material supplying equipment including a decoiler, a pinch roll, a shot blasting machine, a welding equipment, a welding pinch roll, an induction heating apparatus, and a guiding roll;
a mold, wherein the base material supplying equipment is configured to transport a base material strip through the decoiler, the pinch roll, the shot blasting machine, the welding equipment, the welding pinch roll, the induction heating apparatus, and the guiding roll to the mold, the mold is configured to merge the base material strip and molten steel, the base material strip enters the mold along a middle interior of the mold from above and passes through the mold, and two inner walls of the mold are sealed with side seal plates;
two tundishes configured to cast molten steel, wherein the two tundishes are provided above the mold, the molten steel flows from the two tundishes into the mold and makes contact with two sides of the base material strip in the mold so that a preliminary melt merging takes place in which the base material strip forms a clad slab that passes through the mold from below;
a secondary cooling section configured to cool the clad slab by a cooling-spray located at an outlet of a lower part of the mold;
a leveling roll provided after the secondary cooling section;
a rolling mill provided after the leveling roll and configured to roll the clad slab into a clad strip;
an on-line cooling equipment for the clad strip, wherein the on-line cooling equipment is provided after the rolling mill;
a straightening machine provided at an exit of the on-line cooling equipment and configured to straighten the clad strip; and
a dividing sheer configured to cut the straightened clad strip to a fixed length or a coiler configured to coil the straightened clad strip.

2. A process comprising:
sending a base material strip through a pinch roll to a shot blasting machine for a surface cleaning;
welding the shot-blasted base material strips head-to-tail using a welding equipment so as to supply the base material strips continuously;
sending the welded base material strip through a welding pinch roll to an induction heating apparatus for heating;
sending the heated base material strip to a mold through a guiding roll, where the base material strip enters the mold along the middle interior of the mold from above and passes through the mold at a rate of 0.1˜30 m/min;
infusing a molten clad melt in a tundish into the mold with argon blowing on a mold surface to prevent the molten clad melt from oxidation, wherein:
a temperature of the molten clad melt is 30˜150° C. higher than a melting point of the base material strip,
the molten clad melt, which has a high temperature, contacts a surface of the base material strip, which has a low temperature, leading to a slight melt on the surface of the base material strip, and the molten clad melt is solidified on the surface of the base material strip having the low temperature, so as to achieve a melting clad,
the low temperature of the surface of the base material strip and a copper plate of the mold cause the molten clad melt to gradually solidify and form a clad slab;

passing the clad slab formed in the mold through the mold to a secondary cooling section, where cooling water is sprayed on an upper and a lower surface of the clad slab within the secondary cooling section to further solidify the clad slab;
leveling the clad slab after cooling by passing through a leveling roll and continuing into a rolling mill to be rolled into a clad strip, where a clad interface of the clad strip is compressed and deformed at a high temperature during the rolling process, a microstructure of a clad interface structure recovers and recrystallizes, and recombination of the interface promoted by a grain growth and an element diffusion under high temperature;
cooling the clad strip after rolling by on-line cooling equipment;
transporting the clad strip after above cooling to a straightening machine for straightening; and
cutting the clad strip into a fixed length by a dividing shear or coiling the clad strip by a coiler.

3. The process of claim 2 , wherein the clad slab is a single-sided clad slab.

4. The process of claim 2 , further comprising infusing one or two kind of a molten clad melt in a second tundish into the mold, wherein the clad slab is a double-sided clad slab.

5. The process of claim 2 , wherein the induction heating apparatus is filled with a nitrogen or an argon protection atmosphere.

6. The process of claim 2 , wherein a heating temperature of the induction heating apparatus ranges from 850° C. to 1200° C., and a heating rate of the induction heating apparatus ranges from 1˜50° C./s.

7. The process of claim 2 , wherein the base material strips is selected from carbon steel, stainless steel, special alloy steel, titanium, or copper.

8. The process of claim 2 , wherein the heating by the induction heating apparatus comprises merging the base material strip and a molten clad layer.

9. The process of claim 2 , wherein the heating by the induction heating apparatus comprises accelerating melting of a surface metal of the base material strip.

10. The process of claim 2 , wherein the molten clad melt is selected from carbon steel, stainless steel, special alloy steel, titanium, and copper.

11. The process of claim 2 , wherein an on-line cooling rate of the on-line cooling equipment ranges from 1° C./s to 60° C./s, and a finish cooling temperature ranges from 50° C. to 600° C.

12. The process of claim 2 , wherein the base material strip has a thickness of 2˜20 mm.

13. The process of claim 12 , further comprising decoiling the base material strip.

14. The process of claim 2 , wherein the base material strip has a thickness of 21-100 mm.

15. The process of claim 14 , wherein the base material strip is sent directly through the pinch roll to the shot blasting machine.

Assignees

• Baoshan Iron & Steel

Inventors

• Zhang Qingfeng
• Jiao Sihai

Classifications

• C21D8/02

  during manufacturing of plates or strips (C21D8/12 takes precedence) · CPC title

• Y02P10/25

  Process efficiency · CPC title

• C21D9/50 Primary

  for welded joints · CPC title

• B21B1/463 Primary

  in a continuous process, i.e. the cast not being cut before rolling · CPC title

• B21B45/004

  Heating the product · CPC title