Eight ASTM International steel standards have been revised to help address the issue of creep (time-dependent deformation at elevated temperature and constant stress that can lead to failure) for certain steels (9% chromium-1% molybdenum).

 According to ASTM International member Kenneth Orie, a new designation introduced for Grade 91 steels in these standards shows that chemical composition can play an important role in the performance of these steels used at higher temperatures in what is known as the ‘creep-regime’.

This story is reprinted from material from ASTMwith editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier.