Method of making non-oriented electrical steel sheets
US5169457A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 1989 |
| Grant date | Dec 8, 1992 |
| Priority date | — |
| Expiry date | Oct 17, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D8/1261
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A steel slab containing not more than 0.005 wt % carbon, 1.0 to 4.0 wt % silicon, 0.1 to 1.0 wt % manganese, not more than 0.1 wt % phosphorus, not more than 0.005 wt % sulfur, and 0.1 to 2.0 wt % aluminum is directly sent to a hot rolling step without brief soaking, whereby Al and N are made soluble with respect to species other than AlN inevitably precipitated during hot rolling, and uniform and coarse AlN precipitation is formed by a subsequent annealing treatment in which the hot rolled plate is soaked at a temperature of 800.degree. to 1000.degree. C. for a period of time t defined as exp (-0.018T+19.4) .ltoreq.t.ltoreq.exp (-0.022T+25.4) wherein T is the soaking temperature (.degree.C.) and t is the soaking time (minutes). Uniform and satisfactory ferrite grain growth at the recrystallization annealing is provided thereby.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.