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Influence of parameters of nitrogen- and hydrogen-based shielding atmospheres on technological and operational characteristics of thermally treated steel

By Fomin Igor Mikhailovich

Abstract

Subject of investigation: controlled nitrogen- and hydrogen-based atmosphere, structural alloyed and stainless sheet steel. Purpose: determination of quantitative dependence of nitrogen mass transfer to sheet steel during thermal treatment in nitrogen-containing media with revealing of detrimental consequencies in welding and corrosion resistance testing, determination of the economically optimum atmosphere of nitrogen with admixtures of natural gas for thermal treatment of plate structural steel. The work reveals new laws of the behaviour of molecular nitrogen used as an active component of shielding media during thermal treatment of steel and as a source of the nitrogen mass transfer to steel. As a result of the optimization of the atmosphere, methods are formulated for eliminating a negative effect of nitrogen on weldability and corrosion resistance of steel. Parameters are selected for an alternative shielding atmosphere of pure dry hydrogen excluding nitriding of the steel surface, which involves worse weldability and corrosion resistance of a thin sheet. The work develops thermal, time and gas parameters of the economic atmosphere based on nitrogen for shielding of structural plate steel. The hydrogen annealing process is introduced at the metallurgical works. The process of non-decarbonizing annealing is brought to the production level at Volgograd Plant 'Krasny Oktyabr'Available from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio

Topics: 11F - Metallurgy, metallography, METALLURGY,MECHANICAL ENGINEERING
Year: 1992
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Provided by: OpenGrey Repository
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