Community Research and Development Information Service - CORDIS

Abstract

A number of molybdenum-bearing austenitic stainless alloys featuring low nickel and high nitrogen and manganese contents relative to standard type 316 steel have been investigated to develop less expensive substitute steels. Starting with a wide compositional range, preliminary information on the structural phase stability and pitting corrosion properties were evaluated from small (50 g) centrifugal cast heats.

Accordingly, design criteria were obtained which allowed the optimization (reduction) of the alloy element limits, and thus four compositions were selected and produced as plates and sheets in pilot plants for further study of properties, including hot workability, mechanical strength and ductility, weldability and corrosion resistance.

Through the last project stage a single low nickel, type 316 alloy, was produced and extensively studied on a comparative basis using the standard AISI-316 as a control material. The selected nickel reduced composition exhibits equivalent or higher mechanical behaviour derived from its superior nitrogen content. The steel can be TIG and MIG welded without problems, the welds featuring good microstructural and performance characteristics. Nitrogen has also been the key factor to assure the required pitting resistance level, which can be safely increased from higher nitrogen additions to meet more stringent specifications. Other corrosion-related characteristics remain at the same level as compared to the standard 316 grade. de.

Additional information

Authors: BOTELLA J, ACERINOX, Los Barrios (ES);BARTERI M, CSM, Roma (IT);KARJALAINEN P, University of Oulu, Department of Chemical Engineering (FI);OTERO E, Universidad Complutense de Madrid (ES)
Bibliographic Reference: EUR 19379 EN (2000) 71 pp., EUR 11.50
Availability: Available from EUR-OP Sales Agents
ISBN: ISBN 92-828-9562-9
Record Number: 200012183 / Last updated on: 2000-07-12
Category: PUBLICATION
Original language: en
Available languages: en