Extension of ASME VIII Division 1 design limits

Conference · Fri Dec 01 04:00:00 EST 1995

OSTI ID:136871

Marriott, D L ^[1]

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1. Stress Engineering Services, Inc., Cincinnati, OH (United States). Consumer Products Division

ASME Subcommittee 2 on materials presented a series of questions to PVRC regarding the acceptability of using the criteria of ASME Section 2, Part D, Appendix 1 for extending design limits for AISI 304 stainless steel beyond 1,500 F to 2,000 F and Alloy 800 HT from 1,650 F to 1,800 F respectively. This paper describes a project supported by PVRC to try and find an answer to this question. The project consisted of three parts. The first was a survey to determine the intent behind the wording of the ASME criteria in order to make an extrapolation of methods for setting design limits to higher temperatures. The second was a demonstration of a methodology for developing very high temperature limits, using a set of creep data for Alloy 800 HT. The third was a parametric study to evaluate the feasibility of using the minimum creep rate based deformation criterion used in the ASME Code to set strain related limits on materials showing predominantly tertiary creep. Based on this study, an alternative method to that currently employed by ASME in Appendix 1 has been proposed for setting high temperature design limits, based on a consistent margin on time to failure. This method has been presented to ASME for possible adoption. In addition, this investigation revealed some more detailed issues involving cyclic loading at very high temperature. It was recommended that these should be examined further by ASME. These issues are summarized briefly in this paper.

• OSTI ID: 136871
• Report Number(s): CONF-950740--; ISBN 0-7918-1344-4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
CREEP
INCOLOY ALLOYS
LIMITING VALUES
MATERIALS
MECHANICAL PROPERTIES
PRESSURE VESSELS
RUPTURES
STAINLESS STEEL-304
STANDARDS
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES