Mold flux and casting method using same

Patent metadata

Field	Value
Publication number	US-11794238-B2
Application number	US-202017267577-A
Country	US
Kind code	B2
Filing date	May 19, 2020
Priority date	Jul 11, 2019
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

Provided is a mold flux used for casing a cast slab, the mold flux including, bases on a total wt % of thereof, 32-38 wt % of aluminum oxide (Al2O3), 8-12 wt % of strontium oxide (SrO), 8-12 wt % of potassium oxide (K2O), 8-12 wt % of fluorine (F), 5-8 wt % of boron oxide (B2O3), 3-5 wt % of lithium oxide (Li2O), and inevitable impurities. Thus, according to the mold flux, a change in components due to silicon oxide (SiO2) and calcium oxide (CaO) may be suppressed or prevented compared to those in the conventional art.

First claim

What is claimed is:

1. A mold flux used for casing a cast slab, the mold flux comprising, based on a total wt % of thereof, 32-38 wt % of aluminum oxide (Al 2 O 3 ), 8-12 wt % of strontium oxide (SrO), 8-12 wt % of potassium oxide (K 2 O), 8-12 wt % of fluorine (F), 5-8 wt % of boron oxide (B 2 O 3 ), 3-5 wt % of lithium oxide (Li 2 O), and inevitable impurities.

2. The mold flux of claim 1 , not comprising silicon oxide (SiO 2 ).

3. The mold flux of claim 2 , wherein a melting point of the mold flux is 1,000-1,300° C.

4. The mold flux of claim 1 , comprising 9-10 wt % of the strontium oxide (SrO) based on a total weight thereof.

5. The mold flux of claim 1 , comprising 9-10 wt % of the potassium oxide (K 2 O) based on the total weight thereof.

6. The mold flux of claim 1 comprising calcium oxide (CaO), wherein a content of the calcium oxide (CaO) is adjusted so that a basicity (CaO/Al 2 O 3 ) is 0.4 to 0.6.

7. The mold flux of claim 6 , wherein the content of the calcium oxide (CaO) is adjusted so that the basicity(CaO/Al 2 O 3 ) is 0.45 to 0.55.

8. The mold flux of claim 1 , comprising 5 wt % or less of sodium oxide (Na 2 O).

Assignees

• Posco
• Posco Co Ltd

Inventors

• Park Jun Yong
• Chung Tae In
• Kim Seong Yeon

Classifications

• B22D11/07 Primary

  Lubricating the moulds · CPC title

• B22D11/108 Primary

  Feeding additives, powders, or the like · CPC title

• B22D11/111 Primary

  by using protecting powders · CPC title

• C21C7/076

  Use of slags or fluxes as treating agents (C21C7/06, C21C7/064, C21C7/068 take precedence) · CPC title

• C22B9/10

  with refining or fluxing agents; Use of materials therefor, {e.g. slagging or scorifying agents}(C22B9/18 takes precedence){(C22B9/006 takes precedence)} · CPC title