C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/116
C22C 38/42 (2006.01) C22C 30/00 (2006.01) C22C 38/44 (2006.01)
Patent
CA 1211302
ABSTRACT An austenitic stainless corrosion resistant alloy an articles made therefrom having good resistance to pitting and crevice corrosion in oxidizing chloride-bearing media combined with resistance to general corrosion and to intergranular corro- sion in oxidizing media, containing in weight percent about w/o C 0.06 Max. Mn 1.4 Max. Si 0.9 Max. P 0.035 Max. S 0.035 Max. Cr 20-26 Ni 34-44 Mo 3- <5.1 Cu 0.1- <3.1 N 0.4 Max. B 0.005 Max. Ce+La 0.4 Max. Added Nb 1 Max. Ti 0.5 Max. and the balance iron. The amount of nitrogen is not greater than that which can be retained in solution. When present niobium plus titanium ranges upward from a minimum which is sufficient to combine stoichiometrically with the amount of carbon present in excess of 0.025 w/o. In this composition the elements chromium, nickel, molybdenum and copper are balanced so that the value of Correlation I is equal to or less than 1.6021 and that of Correlation II is equal to or less than 5. Correlation I 1.6021 is equal to or greater than the value of 7.0011 - 0.2269(%Cr) - 0.0769(%Ni) -0.046(%Mo) + 0.03(%Cu) + 0.0017(%Ni)2 +0.0486(%Mo)2 - 0.0066(%Ni)(%Mo) Correlation II 5 is equal to or greater than the value of 14.7182 - 0.3759(%Cr) + 0.0986(%Ni) -1.2976(%Mo) + 0.02(%Cu) - 0.0165(%Cr)(%Mo) -0.0202(%Cr)(%Cu) + 0.0223(%Ni)(%Cu) SPECIFICATION This invention relates to an austenitic stainless alloy and, more particularly, to a chromium-molybdenum-nickel-copper- iron alloy containing controlled amounts of other metallic and non-metallic elements balanced to provide a unique combination of good mechanical and general corrosion properties combined with outstanding pitting and crevice corrosion resistance. Industrial development has resulted in an increasing
431759
Debold Terry A.
Frick Douglas G.
Kutzamanis John S.
Carpenter Technology Corporation
Gowling Lafleur Henderson Llp
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