SYMPOSIA PAPER Published: 01 January 1990

Reduced Activation Austenitic Stainless Steels: The Fe-Mn-Cr-C System


Nickel-free manganese-stabilized stainless steels are being developed for fusion reactor applications. As the first part of this effort, the austenite-stable region in the Fe-Mn-Cr-C system was determined. Results indicated that the Schaeffler diagram developed for Fe-Ni-Cr alloys cannot be used to predict the constituents expected for high manganese steels. This indicator is true because manganese is not as strong an austenite stabilizer relative to δ-ferrite formation as predicted by the diagram, but it is a stronger austenite stabilizer relative to martensite than predicted. Therefore, the austenite-stable region for Fe-Mn-Cr-C alloys occurs at lower chromium and higher combinations of manganese and carbon than predicted by the Schaeffler diagram. Development of a manganese-stabilized stainless steel should be possible in the composition range of 20 to 25% manganese, 10 to 15% chromium, and 0.1 to 0.25% carbon. Tensile behavior of an Fe-20%Mn-12%Cr-0.25%C alloy was determined. The strength and ductility of this possible base composition was comparable to Type 316 (UNS 531600) stainless steel in both the solution-annealed and cold-worked condition.

Author Information

Klueh, RL
Oak Ridge National Laboratory, Oak Ridge, TN
Maziasz, PJ
Oak Ridge National Laboratory, Oak Ridge, TN
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Developed by Committee: E10
Pages: 7–18
DOI: 10.1520/STP24945S
ISBN-EB: 978-0-8031-5113-0
ISBN-13: 978-0-8031-1267-4