SYMPOSIA PAPER Published: 01 January 1978
STP34850S

Intergranular Corrosion in 12 Percent Chromium Ferritic Stainless Steels

Source

Intergranular corrosion of Types 409, 405, and 410 stainless steels was evaluated in the heat treated and welded condition. Standard ASTM Method A 262 corrosion tests are too severe for 11 to 13 percent chromium steels, and two modified tests were developed: 65 percent nitric acid at 49°C (140°F) and 50 percent sulfuric acid-cupric sulfate at 49°C (140°F). Type 409, a titanium stabilized ferritic steel, shows intergranular corrosion in nitric acid but is immune in the cupric sulfate test. Type 405 with a duplex structure shows intergranular corrosion in both tests. Type 410 with a martensitic structure does not exhibit intergranular corrosion. The behavior of these steels is explained based on their microstructure.

Author Information

Lula, RA
Research Center, Allegheny Ludlum Steel Co., Brackenridge, Pa.
Davis, JA
Research Center, Allegheny Ludlum Steel Co., Brackenridge, Pa.
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Details
Developed by Committee: A01
Pages: 233–247
DOI: 10.1520/STP34850S
ISBN-EB: 978-0-8031-4725-6
ISBN-13: 978-0-8031-0378-8