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A cast low carbon stainless steel for use in nitric acid at higher concentrations and temperatures
Author(s) -
Tischner Hermann,
Pieger Bernd,
Kratzer Adolf,
Horn ElmarManfred
Publication year - 1986
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19860370303
Subject(s) - nitric acid , weldability , castability , metallurgy , materials science , corrosion , machinability , bearing (navigation) , carbon fibers , carbon steel , cast iron , casting , composite material , welding , alloy , composite number , machining , cartography , geography
This paper introduces three modifications of cast, low carbon stainless steels with about 15 to 20% Cr, 13% Ni and 4.5 to 6.5% Si which can be used for pumps and valves in nitric acid plants. Mechanical and structural properties, castability, machinability and weldability are discussed to characterize the practical applicability of these alloys for producers and users of such cast components. Laboratory corrosion tests in boiling nitric acid between 50 and 98 wt% prove the superior resistance of the Si‐bearing alloys in the 90% and 98% acid compared to standard CrNi‐steels without Si. Comparative field tests with cast pump impellers and casings confirm the very good corrosion resistance of the Si‐bearing alloys in highly concentrated nitric acid under service conditions.