Conclusions
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1.
The presence of Cr ferrite in austenitic acid-resistant steel makes it resistant to intercrystalline corrosion even if it contains no titanium. This may be ascribed to migration of chromium and carbon at the boundary between the α- and γ-phases.
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2.
When cast components with about 0.15–0.20% Ti are produced, combinations of the principal components (chromium, nickel, and manganese) can be worked out which will ensure that the as-quenched metal contains 10–25% of α-phase; this provides a high resistance to intercrystalline corrosion.
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3.
Ti contents above 0.30% result in castings with nonmetallic inclusions. Dendritic titanium sulfide inclusions are formed at the grain boundaries in cast steel.
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4.
It is recommended that Kh18N4G4 steel be used commercially and that 18-8 Ti steel be replaced by Kh20N8 steel [20% Cr, 8 Ni] of the composition proposed above.
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References
E.I. Astrov,Metalloved. i Obrab. Metallov, 1957, (1), pp 30–4.
A.N. Chervyakov, Metallographic Determination of the Inclusions in Steel, [B], Metallurgizdat, 1958.
G.D. Rogoza, A.L. Golovchiner, A.M. Poti and A.K. Zaiko,Stal' Vol. 15, 1955, (6), pp 560–1.
E.I. Astrov,Stal', Vol. 16, 1956, (7), p 651.
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