ASTM_DS58-1975.pdf

EVALUATION OF THE ELEVATED TEMPERATURE TENSILE AND CREEP-RUPTURE PROPERTIES OF 3 TO 9 PERCENT CHROMIUM-MOLYBDENUM STEELS Prepared for the METAL PROPERTIES COUNCIL by G.V.Smith ASTM DATA SERIES PUBLICATION DS 58 List price$14.75 05-058000-40 AMERICAN SOCIETY FOR TESTING AND MATERIALS 1916 Race Street,Philadelphia,Pa.19103 by American Society for Testing and Materials Library of Congress Catalog Card Number:75-18417 NOTE The Society is not responsible,as a body,for the statements and opinions advanced in this publication.Printed in Gibbsboro,N.J.October 1975 Foreword This book represents a part of a continuing effort by The Metal Properties Council on behalf of the engineering community.Individuals and organizations generating additional information concerning the materials evaluated in this report,or in others in this series,are urged to make these data available to the Council for incorporation in future revisions.Address the Council at:The United Engineering Center,345 East 47th St.,New York,N.Y.10017.Related ASTM Publications Supplemental Report on the Elevated-Temperature Properties of Chromium-Molybdenum Steels,DS 6-S2(1971),$7.00,05-006002-40 Evaluation of the Elevated Temperature Tensile and Creep-Rupture Properties of C-Mo,Mn-Mo,and Mn-Mo-Ni Steels,DS 47(1971),$6.25 05-04700-02 A Note of Appreciation to Reviewers This publication is made possible by the authors and,also,the unheralded efforts of the reviewers.This body of technical experts whose dedication,sacrifice of time and effort,and collective wisdom in reviewing the papers must be acknowledged.The quality level of ASTM publications is a direct function of their respected opinions.On behalf of ASTM we acknowledge with appreciation their contribution.ASTM Committee on Publications Editorial Staff Jane B.Wheeler,Managing Editor Helen M.Hoersch,Associate Editor Charlotte E.Wilson,Senior Assistant Editor Ellen J.McGlinchey,Assistant Editor Contents i 2 8 8 8 9 9 9 9 9 9 10 11 12 12 13 13 Choice Between Evaluation Procedures 14 Comparison of Grades 14 Acknowledgments 14 References 15 Tables 16 Figures 7 thru 60 81 Appendix:Specifications Encompassed in Report 207 Figures 1 thru 6 Introduction Yield Strength,Tensile Strength,and Ductility Part 1 3Cr-lMo Part 2 5Cr-Mo Part 3 5Cr-HMo-Si Part 4 5Cr-VMo-Ti Part 5 7Cr-1/4Mo Part 6 9Cr-lMo Creep and Rupture Properties Part 1 3Cr-lMo Part 2 5CT-VMO Part 3 5Cr-&Mo-Si Part 4 5Cr-Mo-Ti Part 5 ICi-VMo Part 6 9Cr-lMo REFERENCE:Smith,G.V.,Evaluation of the Elevated Temperature Tensile and Creep Rupture Properties of 3-9 percent Chromium-Molybdenum Steels;ASTM Data Series,American Society for Testing and Materials,1975.ABSTRACT:The evaluations of this report cover 6 grades of chromium-molybdenum steel of interest for applications in boilers and pressure vessels:3 Cr-1 Mo 5 Cr-h Mo 5 Cr-h Mo-Si 5 Cr-h Mo-Ti 7 Cr-h Mo 9 Cr-1 Mo The data that are evaluated include both previ-ously published data and hitherto unpublished data gathered by The Metal Properties Council from con-tributing laboratories.The properties that have been evaluated include yield strength,tensile strength,creep strength and rupture strength.In evaluating the yield and tensile strength data,a normalizing procedure has been employed that involves ratioing the elevated temperature strength of a particular lot to the room temper-ature strength of that same lot.The method of least squares is then employed to define a trend curve for the ratio values representing a par-ticular material grade.The rupture and secondary creep rate data have been evaluated by both direct isothermal inter-polation or extrapolation,and by time-temperature parameter,to establish the temperature dependence of the average and minimum stresses to cause a secondary creep rate of 0.1 and 0.01 percent per 1000 hours,and of the average and minimum stresses to produce rupture in 1000,10,000 and 100,000 hours.Elongation and reduction of area data at frac-ture are included for both the short time elevated temperature tensile tests and for the rupture tests.Summary figures,Figs.1-6,immediately fol-lowing this abstract show the temperature depen-dence of strength properties for the 6 grades of steel evaluated in this report.In these illus-trations,the yield and tensile strength trend curves have been adjusted so that they corres-pond at room temperature to the specified minimum values of common ASTM product specifications.The creep and rupture strengths represent the average values for a secondary creep rate of 0.01 percent per 1000 hours and rupture in 100,000 hours,respectively.Tabular comparisons of the yield strength ratio and tensile strength ratio trend curves for the six grades of steel are provided in Table V,and graphical comparisons are offered in Figs.57-58.Tabular comparisons of the creep and rupture strengths are provided in Tables VIII through XI,with graphical comparisons of average 100,000-hour rupture strengths and average 0.01 percent per 1000 hour creep strengths in Fi