ASTM_DS11S1-1970.pdf

AN EVALUATION OF THE ELEVATED TEMPERATURE TENSILE AND CREEP-RUPTURE PROPERTIES OF WROUGHT CARBON STEEL Prepared for the METALS PROPERTIES COUNCIL by G.V.Smith ASTM Data Series DS 11 SI(Supplement to Publication DS 11,formerly STP 180)List price$6.00 AMERICAN SOCIETY FOR TESTING AND MATERIALS 1916 Race Street,Philadelphia,Pa.19103 By American Society for Testing and Materials 1970 Library of Congress Catalog Card Number:73-109152 SBN 8031-2004-4 Note The Society is not responsible,as a body,for the statements and opinions advanced in this publication.Printed in Alpha,New Jersey January 1970 Data Series DS 11S1 The American Society for Testing and Materials Related ASTM Publications Elevated-Temperature Properties of Carbon Steels,DS 11(1955),$3.75 Elevated-Temperature Properties of Wrought Medium-Carbon Alloy Steels,DS 15(1957),$4.25 REFERENCE:Smith,G.V.,An Evaluation of the Elevated Temperature Tensile and Creep-Rupture Properties of Wrought Carbon Steel,ASTM Data Series,DS 11 S-l,American Society for Testing and Materials,1970.ABSTRACT:This report seeks to offer a best current assessment of the several elevated temperature properties that com-monly form the basis for establishing allowable stresses or design stress in-tensity values.The results are pre-sented in a form readily usable for that purpose.The data that are evaluated are those that have become available since the publication in 1955 of ASTM Data Series Publication DS 11(formerly STP No.180),Elevated Temperature Pro-perties of Carbon Steels,as well as selected data from that earlier publica-tion.The body of the report provides,in text,tables and figures,details con cerning the materials,the evaluation procedures that were employed,and the results.In evaluating rupture strength,ex-trapolations to 100,000 hours were per-formed both by direct extension of iso-thermal plots of stress and rupture-time for the individual lots,and by a time-temperature parameter,scatter-band pro-cedure.Owing to a concern that differ-ent populations may be intermixed in a scatter band approach,the rupture strengths shown in the summary Fig.1 represent the results of the direct individual-lot extrapolations.A summary of the results of the eval-uations is provided in Fig.1.In this figure,all of the creep and rupture data have been treated as if from a single population,even though there is evidence presented in the body of the report that material produced to specifications that require a minimum tensile strength of 60,000 psi or higher has a greater rup-ture strength than material produced to specifications that require minimum ten-sile strengths less than 60,000 psi.Evidence is also offered for a slight superiority in rupture strength at the lower end of the creep range of tempera-ture,of material made to coarse-grain practice.The yield and tensile strengths of Fig.1 represent material that had been tempered after hot working or after normalizing,in practical recognition of the liklihood that material will receive such treatment during fabrication,if not before.The tensile strength curves of Fig.1 recognize a distinct difference between material made to coarse-grain and fine-grain practice;however,the differences in yield strength were small,and scatter large,and the curves of Fig.1 are based on a common trend curve for tempered,coarse-and fine-grain material.Individual trend curves for yield and tensile strength,expressed as strength ratios,are compared in Figs.2 and 3.KEY WORDS:elevated temperature,tensile strength,yield strength,creep strength,rupture strength,carbon steel,mechani-cal properties,data evaluation,elonga-tion,reduction of area.?DS11-S1-EB/Jan.1970?Copyright 1970 by ASTM International www.astm.org INTRODUCTION Since the publication in 19 55 of ASTM Data Series Publication DS 11(formerly STP No.180),Elevated Temperature Pro-perties of Carbon Steels,prepared by W.F.Simmons and H.C.Cross for the ASTM-ASME Joint Committee on Effect of Temperature on the Properties of Metals,additional data have been generated for this material.These additional data have been gathered by the Metal Properties Council,and together with the previously published data are evaluated in the pre-sent report.The report is one of a con-tinuing series,sponsored by the Metal Properties Council,which seek to assess selected elevated temperature properties of metals and to publish the results in a form readily useful by Code groups and other organizations for establishing de-sign stress intensity values.The data gathered by the Metal Pro-perties Council are appended to the pre-sent report,but with the exception of Code Nos.P 20-25 and T 20-T 22,which represent important,comprehensive test programs,data from DS 11 have not been recopied into the tables.However,a coding key to the DS data that have been integrated into the evaluations is pro-vided in Table I of the present report.The data were obtained from indus-trial,government,institute and univer-sity laboratories in the United States,an