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09374 A New Lean Austenitic Alloy with Comparable Properties to Type 316 SS

Picture for 09374 A New Lean Austenitic Alloy with Comparable Properties to Type 316 SS
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Product Number: 51300-09374-SG
ISBN: 09374 2009 CP
Author: John F. Grubb, Bahri Ozturk and John J. Dunn
Publication Date: 2009
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A new, lean, molybdenum-containing austenitic stainless steel with lower nickel and molybdenum content has been developed. This alloy, currently identified as ATI 216HP™, has properties comparable to Type 316L stainless steel, and was developed to be used in the environments where Type 316L currently is used. In the absence of a UNS designation assignment, the alloy is identified as S216XX alloy in this paper. An UNS number for this alloy will be obtained later. The composition of S216XX alloy (nominally 18%Cr, 4.5% Ni, 5.0% Mn, 1.0 %Mo and 0.19% N, balance Fe) provides this alloy with outstanding resistance to a broad range of corrosive environments.

S216XX alloy was tested to determine its susceptibility to corrosion in many environments. Its resistance to intergranular attack was measured using ASTM A262 Practices B, C and E. The corrosion resistance of this alloy was also determined in various boiling acid solutions, and compared to that for Type 316L stainless steel.

The critical pitting temperature (CPT) and critical crevice corrosion temperature (CCCT) of the new alloy was determined using ASTM G150 and ASTM G48 Practice B and the results are compared to those for Type 316L stainless steel.

Stress corrosion cracking (SCC) behavior was also investigated in several different chloride environments, and compared to other alloys.

The relevance of the above corrosion data will be related to the probable performance of the new austenitic stainless steel in corrosive environments present in the chemical process industries.
A new, lean, molybdenum-containing austenitic stainless steel with lower nickel and molybdenum content has been developed. This alloy, currently identified as ATI 216HP™, has properties comparable to Type 316L stainless steel, and was developed to be used in the environments where Type 316L currently is used. In the absence of a UNS designation assignment, the alloy is identified as S216XX alloy in this paper. An UNS number for this alloy will be obtained later. The composition of S216XX alloy (nominally 18%Cr, 4.5% Ni, 5.0% Mn, 1.0 %Mo and 0.19% N, balance Fe) provides this alloy with outstanding resistance to a broad range of corrosive environments.

S216XX alloy was tested to determine its susceptibility to corrosion in many environments. Its resistance to intergranular attack was measured using ASTM A262 Practices B, C and E. The corrosion resistance of this alloy was also determined in various boiling acid solutions, and compared to that for Type 316L stainless steel.

The critical pitting temperature (CPT) and critical crevice corrosion temperature (CCCT) of the new alloy was determined using ASTM G150 and ASTM G48 Practice B and the results are compared to those for Type 316L stainless steel.

Stress corrosion cracking (SCC) behavior was also investigated in several different chloride environments, and compared to other alloys.

The relevance of the above corrosion data will be related to the probable performance of the new austenitic stainless steel in corrosive environments present in the chemical process industries.
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