The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 24, 2017
Filed:
Jul. 23, 2015
Baoshan Iron & Steel Co., Ltd., Shanghai, CN;
Chen Zhang, Shanghai, CN;
Dexiang Cai, Shanghai, CN;
Feng Mei, Shanghai, CN;
Jianguo Shen, Shanghai, CN;
BAOSHAN IRON & STEEL CO., LTD., Shanghai, CN;
Abstract
A fluoride-free continuous casting mold flux for ultralow carbon steel, comprising the following components in weight percentage: 3-10% of NaO, 0-3% of LiO, 3-8% of MgO, 5-15% of MnO, 0-8% of BaO, 4-12% of AlO, and impurities with a content of no more than 2%, the balance being CaO and SiO, wherein the ratio of CaO/SiOis 0.8-1.3; the raw materials are mixed and then pre-melted; the pre-melted mold flux requires micro-adjusting according to the component deviation, and the ratio of the pre-melted material is not lower than 70%; then a carbonaceous material of 1-3% by the total weight of the mold flux is added and mixed so as to obtain the finished product mold flux. Said mold flux has a melting point of 1100-1200° C. and a viscosity of 0.2-0.6 Pa·s at 1300° C. A method for preparing a mold flux comprising the following steps: mixing raw materials, pre-melting to obtain a pre-melt; then continuously supplementing raw materials into the pre-melt to obtain a substrate with a desired composition; then adding a carbonaceous material to the substrate and mixing so as to obtain said mold flux. This mold flux is a boron-free and fluoride-free mold flux, can effectively reduce the inclusion defect of blank casting and increase the yield of blank casting.