Manufacture of sheets of 1Kh21N5T at Zaporozhstal' Plant

Autor: A. A. Babakov, N. P. Cherkashina, V. V. Barzii
Rok vydání: 1965
Předmět:
Zdroj: Metal Science and Heat Treatment. 7:191-193
ISSN: 1573-8973
0026-0673
DOI: 10.1007/bf00658533
Popis: 1. The technological usability of 1Kh21N5T steel during hot rolling of ingots in a slab mill, or of slabs in a thin-sheet continuous mill, is determined by the chemical composition of the metal and austenite-ferrite phase ratio, and is a function of the heating temperature of the metal. But if the steel contains >0.55% Ti and ≤5.3% Ni, the application of high heating temperatures leads to overheating of the metal (the formation of large-grain ferrite structure and absence of austenite). Steel with a structure of this kind exhibits heightened susceptibility to embrittiement. 2. The embrittlement of hot-rolled strip is evidently connected with 475-degree brittleness inherent in ferrite and ferrite-austenite steels. An increased titanium content, which promotes the formation of a ferrite structure, increases the likelihood of embrittlement. 3. Reduction of the titanium content to ≤0.50% at 4.8–5.3% Ni makes it necessary hot-rolling of the metal in continuous and slab mills under high-temperature conditions (close to the technology for Kh18N10T). With this, composition stability of the mechanical properties is attained.
Databáze: OpenAIRE
Externí odkaz: