Continuous casting method

Patent metadata

Field	Value
Publication number	US-2016207101-A1
Application number	US-201314914118-A
Country	US
Kind code	A1
Filing date	Aug 26, 2013
Priority date	Aug 26, 2013
Publication date	Jul 21, 2016
Grant date	—

Abstract

In a continuous casting apparatus 100 for casting a stainless steel billet 3 c , a long nozzle 2 extending into a tundish 101 is provided at a ladle 1 for pouring a molten stainless steel 3 in the ladle 1 into the tundish 101 . Further, a nitrogen gas 4 is supplied as a seal gas around the molten stainless steel 3 in the tundish 101 , and continuous casting of the stainless steel billet 3 c is performed, in which, while immersing the spout 2 a of the long nozzle 2 into the molten stainless steel 3 in the tundish 101 , the molten stainless steel 3 is poured through the long nozzle 2 into the tundish 101 and the molten stainless steel 3 in the tundish 101 is poured into a casting mold 105.

First claim

1 . A continuous casting method for casting a solid metal by pouring a molten metal in a ladle into a tundish disposed therebelow and continuously pouring the molten metal in the tundish into a casting mold, the continuous casting method comprising:
supplying a nitrogen gas as a seal gas around the molten metal in the tundish; and pouring into the tundish the molten metal in the ladle through a pouring nozzle and pouring into the casting mold the molten metal in the tundish, while immersing a spout of the pouring nozzle, which serves for pouring into the tundish the molten metal in the ladle, into the molten metal in the tundish.

2 . The continuous casting method of claim 1 , wherein a tundish powder is sprayed over a surface of the molten metal in the tundish, and the tundish powder is interposed between the molten metal and the nitrogen gas.

3 . The continuous casting method of claim 1 , wherein the spout of the pouring nozzle is inserted to a depth of 100 mm to 150 mm into the molten metal in the tundish.

4 . The continuous casting method of claim 1 , wherein the solid metal which is to be cast is a stainless steel with a concentration of contained nitrogen of 400 ppm or less.

5 . The continuous casting method of claim 2 , wherein the spout of the pouring nozzle is inserted to a depth of 100 mm to 150 mm into the molten metal in the tundish.

6 . The continuous casting method of claim 2 , wherein the solid metal which is to be cast is a stainless steel with a concentration of contained nitrogen of 400 ppm or less.

7 . The continuous casting method of claim 3 , wherein the solid metal which is to be cast is a stainless steel with a concentration of contained nitrogen of 400 ppm or less.

Assignees

• Nisshin Steel Co Ltd

Inventors

• Honda Yuuki
• Morikawa Hiroshi

Classifications

• B22D27/003

  by using inert gases · CPC title

• B22D11/106 Primary

  Shielding the molten jet {(B22D41/50 takes precedence)} · CPC title

• B22D11/002 Primary

  Stainless steels · CPC title

• B22D11/11

  Treating the molten metal · CPC title

• B22D11/117

  by treating with gases (B22D11/118, B22D11/119 take precedence) · CPC title