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Validity of High-Temperature Strength Standards for Heat Resistant Steels

[+] Author Affiliations
F. Abe, K. Kimura

National Institute for Materials Science, Japan

F. Masuyama

Kyushu Institute of Technology, Japan

Y. Sawaragi

Sumitomo Metal Technology, Japan

Paper No. PVP2004-2252, pp. 3-10; 8 pages
  • ASME/JSME 2004 Pressure Vessels and Piping Conference
  • Elevated Temperature Design and Analysis, Nonlinear Analysis, and Plastic Components
  • San Diego, California, USA, July 25–29, 2004
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4667-9
  • Copyright © 2004 by ASME


The ASME allowable stress is evaluated for 2.25Cr-1Mo, Mod.9Cr-1Mo and type 304 (18Cr-8Ni) steels. The change in coefficient for tensile strength for the allowable stress from 1/4 to 1/3.5 causes a shift of boundary temperature between the tensile and creep regions to lower temperature only by 20–30°C, although it increases the allowable stress by 15% in the tensile region for 2.25Cr-1Mo steel. Whether the allowable stress is determined by 80% of the minimum stress or 67% of the average stress to cause rupture at the end of 105 h depends on the width of scatter band of creep rupture. Type 304 steel exhibits large heat-to-heat variation in time to rupture at long times and the 105 h creep rupture stress distinctly depends on impurity contents such as Al. The stress to produce a creep rate of 0.01% /1000h is about 50 MPa lower than the stress to produce a minimum creep rate of 0.01%/1000h, corresponding to 10−5 %/h, for 1Cr-0.5Mo steel. This results from the strain accumulation due to easy deformation in the transient or primary creep.

Copyright © 2004 by ASME



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