Method for continuously casting ferritic stainless steel strips free of microcracks
US6622779B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 14, 2002 |
| Grant date | Sep 23, 2003 |
| Priority date | — |
| Expiry date | Jan 14, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/28
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention concerns a method for continuously casting a ferritic stainless steep strip with thickness not more than 10 mm directly from liquid metal between two cooled rolls with horizontal axes and driven in rotation, characterized in that: the liquid metal composition in weight percentages is as follows: % C+% N≦0.12; % Mn≦1; % P≦0.4; % Si≦1; % Mo≦2.5; % Cr between 11 and 19; A1≦1%; % Ti+%Nb+% Zr≦1; the rest being iron and the impurities resulting from preparation; the &Ugr;p index of the liquid metal ranges between 35% and 60%, &Ugr;p being defined by the formula: &ggr;p=420% C+470% N+23% Ni+9% Cu+7% Mn 11.5% Cr 11.5% Si 12% Mo 23% V 47% Nb 49% Ti 52% A1+189: the surface roughness of said rolls being more than 5 &mgr;m; in the proximity of the meniscus metal liquid present between the rolls an inerting gas is used consisting of at least 60% by volume of a gas soluble in steel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.