1、Designator: Meta Bold 24/26Revision Note: Meta Black 14/16STP-NU-020VERIFICATION OF ALLOWABLE STRESSESIN ASME SECTION III SUBSECTION NH FOR ALLOY 800HSTP-NU-020 VERIFICATION OF ALLOWABLE STRESSES IN ASME SECTION III SUBSECTION NH FOR ALLOY 800H Prepared by: R. W. Swindeman Cromtech Inc M. J. Swindem
2、an University of Dayton Research Institute B. W. Roberts BW Roberts Consultants B. E. Thurgood Bpva Engineering D. L. Marriott Stress Engineering Services Date of Issuance: November 1, 2008 This report was prepared as an account of work sponsored by U.S. Department on Energy (DOE) and the ASME Stand
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10、gy, LLC Three Park Avenue, New York, NY 10016-5990 ISBN No. 978-0-7918-3186-1 Copyright 2008 by ASME Standards Technology, LLC All Rights Reserved Allowable Stresses in Section III-NH for Alloy 800H STP-NU-020 iii TABLE OF CONTENTS Foreword . vi Abstract vii PART I BASE METAL. 1 1 INTRODUCTION . 2 2
11、 IDENTIFICATION OF MATERIALS 3 3 AVAILABLE SOURCES FOR CREEP AND STRESS-RUPTURE DATA . 5 4 DATA ANALYSIS PROCEDURES. 8 4.1 Current ASME Section II Procedures for Setting Time-Dependent Stress Allowables 8 4.2 ASME Subsection NH Procedures for Setting Time-Dependent Stress Intensities 10 4.3 A Few Ot
12、her Data Analysis Procedures 11 5 EVALUATION OF THE STRESS-RUPTURE OF ALLOY 800H AT 750C AND HIGHER. 13 5.1 Selection of Data . 13 5.2 Selection of Analysis Methods 15 5.3 Example of the Addition to III-NH Table I-14.6C 21 6 SUMMARY AND RECOMMENDATIONS 22 References Part I 23 PART II - WELDMENTS 27
13、1 INTRODUCTION . 28 2 IDENTIFICATION OF MATERIALS 29 3 REVIEW OF DATABASES FOR DEPOSITED FILLER METALS AND WELDMENTS. 32 4 DATA ANALYSIS 35 4.1 Tensile Data. 35 4.2 Assembly of the Stress-Rupture Database 39 4.3 Procedure for Determining the Stress Reduction Factors . 39 4.4 Calculation of Stress Re
14、duction Factors 42 5 DISCUSSION 45 6 SUMMARY AND RECOMMENDATIONS 46 References Part II . 47 Appendix 1 - Compilation of Data on Weld Metals and Weldments. 49 Appendix 2 - Coefficients for the Larson Miller Fit to Stress-Rupture Data . 52 Appendix 3 - Examples of Calculated Stress Factors for Alloy 8
15、2 Weldments. 53 Appendix 4 - Recommended Creep-Rupture Experimental Program to Address Stress Rupture Factors for Weldments in Alloy 800H for Service above 750C. 54 Appendix 5 - Parametric Study of Weldment Behavior. 59 Acknowledgments 65 STP-NU-020 Allowable Stresses in Section III-NH for Alloy 800
16、H iv Abbreviations and Acronyms .66 LIST OF TABLES Table 1 - Comparison of Chemistries for Variants of Alloy 8004 Table 2 - Effect of Data Selection on the LM Constants, C, for Three Lots in a Lot-Centered Analyses19 Table 3 - Calculated Stresses for 100,000 Hours (MPa) Which Form the Basis for the
17、Time-Dependent Allowable Stresses in ASME II-D19 Table 4 - Comparison of the Average Strength of Alloy 800H at 800C and 100,000 Hours from a Number of Sources21 Table 5 - Comparison of Chemistries for Variants of Alloy 80029 Table 6 - Comparison of Chemistries for Coated Filler Metal Electrodes30 Ta
18、ble 7 - Comparison of Chemistries for Bare Filler Metal Electrodes .31 Table 8 - Calculated 105 H Rupture Strengths and SRFs for Alloy 82 Welds and Weldments .43 Table 9 - Stress-Rupture Data for Alloy A Deposited Weld Metal 49 Table 10 - Stress-Rupture Data for Alloy A Deposited Cross Welds.49 Tabl
19、e 11 - Stress-Rupture Data for 21-33Nb Weld Metal 49 Table 12 - Stress- Rupture Data for Alloy 182 Deposited Weld Metal 49 Table 13 - Stress-Rupture Data for Alloy 82 Deposited Weld Metal .50 Table 14 - Stress-Rupture Data for Alloy 82 Cross Welds.51 Table 15 - Stress-Rupture Data for Alloy 182 Cros
20、s Weld 51 Table 16 - Test Matrix for Alloy 82 Weldment Evaluation55 Table 17 - Test Matrix for Alloy 117 or Alloy 617 Weld Metal Evaluation 56 Table 18 - Test Matrix for Alloy 21/33Nb Weld Metal Evaluation56 Table 19 - Test Matrix for Alloy 800H Weldments57 Table 20 - Effect of Weldment Geometry on
21、the Calculated Strength Reduction Factor.63 LIST OF FIGURES Figure 1 - Distribution of Carbon Contents in 37 Lots of Alloy 800H.13 Figure 2 - Distribution of Al+Ti Contents in 37 Lots of Alloy 800H.14 Figure 3 - Distribution of Grain Sizes in 37 Lots of Alloy 800 14 Figure 4 - Distribution of Testin
22、g Temperatures for 37 Lots of Alloy 800H .15 Figure 5 - Distribution of Rupture Lives for 37 Lots of Alloy 800H15 Figure 6 - Log Stress vs. Larson Miller Parameter for Alloy 800H .16 Figure 7 - Histogram of Residuals for Fit of LM Parameter for Alloy 800H.17 Figure 8 - Residuals vs. Rupture Life for
23、 LM Parameter Fit to Alloy 800H17 Figure 9 - Residuals vs. Stress for LM Parameter Fit to Alloy 800H.18 Allowable Stresses in Section III-NH for Alloy 800H STP-NU-020 v Figure 10 - Residuals vs. Temperature for LM Parameter Fit to Alloy 800H 18 Figure 11 - Favevs. Temperature for Alloy 800H. 20 Figu
24、re 12 - Comparison of ASME II-D Stresses with the New Fit for Alloy 800H 20 Figure 13 - Minimum Stress-to-Rupture vs. Time for Alloy 800H 21 Figure 14 - Comparison of the Yield Strength for Alloy A Weld Metal with Alloy 800H 36 Figure 15 - Comparison of the Tensile Strength for Alloy A Weld Metal wi
25、th Alloy 800H. 36 Figure 16 - Comparison of the Yield Strength for 21/33Nb Weld Metal with Alloy 800H and Alloy A Weld Deposit 36 Figure 17 - Comparison of the Tensile Strength for 21/33NB Weld Metal with Alloy 800H and Alloy A Weld Deposit 36 Figure 18 - Comparison of the Yield Strength for Alloy 1
26、17 Weld Metal with Alloy 800H. 37 Figure 19 - Comparison of the Tensile Strength for Alloy 117 Weld Metal with Alloy 800H 37 Figure 20 - Comparison of the Yield Strengths of SMA and GTA Weld Metals 38 Figure 21 - Comparison of the Tensile Strengths of SMA and GTA Weld Metals . 38 Figure 22 - Compari
27、son of the Yield Strength for Alloy 82 Weld Metal with Alloy 800H. 38 Figure 23 - Comparison of the Tensile Strength for Alloy 82 Weld Metal with Alloy 800H 38 Figure 24 - Comparison of Weldment Yield Strength with Alloy 800H Base Metal 39 Figure 25 - Comparison of Weldment Tensile Strength with All
28、oy 800H Base Metal 39 Figure 26 - Comparison of Alloy A Weld Strength with Alloy 800H Base Metal 41 Figure 27 - Comparison of Alloy A Weldment Strength with Alloy 800H Base Metal 41 Figure 28 - Comparison of Alloy 21/33Nb Weld Strength with Alloy 800H Base Metal . 41 Figure 29 - Comparison of Alloy
29、82 Weld Strength with Alloy 800H Base Metal . 42 Figure 30 - Comparison of Alloy 82 Weldment Strength with Alloy 800H Base Metal . 42 Figure 31 - Calculated Stress Rupture Factors for Alloy 82 for 100,000 hr. . 43 Figure 32 - Calculated Stress Rupture Factors for Alloy A for 100,000 hr 43 Figure 33
30、- Comparison of Rupture Data for Alloy 82 Weldments with Calculated Curves Based on the LMP. 44 Figure 34 - Comparison of Rupture Data for Alloy A Weldments with Calculated Curves Based on the LMP. 44 Figure 35 - Example Geometries of Weldments with 20 Interface Angle 59 Figure 36 - General View of
31、Weld FE Model 60 Figure 37 - Detail of Weld Interface 60 Figure 38 - Mises Stress Distribution on Weld Interface Under Full Developed Creep Conditions . 62 Figure 39 - Hydrostatic Stress Distribution on Weld Interface Under Full Developed Creep Conditions 63 STP-NU-020 Allowable Stresses in Section
32、III-NH for Alloy 800H vi FOREWORD This document is the result of work resulting from Cooperative Agreement DE-FC07-05ID14712 between the U.S. Department of Energy (DOE) and ASME Standards Technology, LLC (ASME ST-LLC) for the Generation IV (Gen IV) Reactor Materials Project. The objective of the pro
33、ject is to provide technical information necessary to update and expand appropriate ASME materials, construction and design codes for application in future Gen IV nuclear reactor systems that operate at elevated temperatures. The scope of work is divided into specific areas that are tied to the Gene
34、ration IV Reactors Integrated Materials Technology Program Plan. This report is the result of work performed under Task 1 titled “Verification of Allowable Stresses in ASME Section III, Subsection NH with Emphasis on Alloy 800H and Grade 91 Steel (a.k.a., 9Cr-1Mo-V or Modified 9CR-1Mo).” ASME ST-LLC
35、 has introduced the results of the project into the ASME volunteer standards committees developing new code rules for Generation IV nuclear reactors. The project deliverables are expected to become vital references for the committees and serve as important technical bases for new rules. These new ru
36、les will be developed under ASMEs voluntary consensus process, which requires balance of interest, openness, consensus and due process. Through the course of the project, ASME ST-LLC has involved key stakeholders from industry and government to help ensure that the technical direction of the researc
37、h supports the anticipated codes and standards needs. This directed approach and early stakeholder involvement is expected to result in consensus building that will ultimately expedite the standards development process as well as commercialization of the technology. ASME has been involved in nuclear
38、 codes and standards since 1956. The Society created Section III of the Boiler and Pressure Vessel Code, which addresses nuclear reactor technology, in 1963. ASME Standards promote safety, reliability and component interchangeability in mechanical systems. The American Society of Mechanical Engineer
39、s (ASME) is a not-for-profit professional organization promoting the art, science and practice of mechanical and multidisciplinary engineering and allied sciences. ASME develops codes and standards that enhance public safety, and provides lifelong learning and technical exchange opportunities benefi
40、ting the engineering and technology community. Visit www.asme.org. The ASME Standards Technology, LLC (ASME ST-LLC) is a not-for-profit Limited Liability Company, with ASME as the sole member, formed to carry out work related to newly commercialized technology. The ASME ST-LLC mission includes meeti
41、ng the needs of industry and government by providing new standards-related products and services, which advance the application of emerging and newly commercialized science and technology and providing the research and technology development needed to establish and maintain the technical relevance o
42、f codes and standards. Visit www.stllc.asme.org for more information. Allowable Stresses in Section III-NH for Alloy 800H STP-NU-020 vii ABSTRACT Part I Base Metal - Databases summarizing the creep-rupture properties of alloy 800H and its variants were reviewed and referenced. For the most part, the
43、 database was judged to be adequate to meet the needs for time-dependent properties in the extension of alloy 800H in ASME Section III Subsection NH (III-NH) to 900C (1650F) and 600,000 hours. Procedures for analyzing creep and stress-rupture data for III-NH were reviewed and compared to the current
44、 procedure endorsed by the ASME Section II on Materials. The stress-rupture database for alloy 800H in the temperature range of 750 to 1000C (1382 to 1832F) was assembled and used to estimate the average and minimum strength for times to 600,000 hours. Part II Weldments - Databases summarizing the t
45、ensile and creep-rupture properties of deposited weld metal and weldments for alloy 800H were reviewed and referenced. Procedures for analyzing creep-rupture data for temperatures of 750C (1382F) and higher were reviewed and used to estimate the weld strength reduction factors (SRFs) as a function o
46、f time and temperature for temperatures to 900C (1650F). The database was judged to be inadequate to meet the needs for the extension of the use of filler metal for alloy 800H in ASME Section III Subsection NH to 900C (1650F). Five appendices were included that 1) listed the data used in the evaluat
47、ion of the SRFs, 2) provided the values for parametric constants in the models, 3) provided an example of the calculated SRFs for alloy 82, 4) recommended supplemental creep-rupture testing to expand the database and improve the estimation of SRFs for long-time service and 5) provided a summary of a
48、 parametric Finite Element Analysis (FEA) study of cross-weld samples. STP-NU-020 Allowable Stresses in Section III-NH for Alloy 800H viii INTENTIONALLY LEFT BLANK Allowable Stresses in Section III-NH for Alloy 800H STP-NU-020 1 PART I BASE METAL STP-NU-020 Allowable Stresses in Section III-NH for A
49、lloy 800H 2 1 INTRODUCTION A collaborative effort has been established between the Department of Energy (DOE) and the American Society of Mechanical Engineers (ASME) to address technical issues related to codes and standards applicable to the Generation IV Nuclear Energy Systems Program 1. A number of tasks have been identified that will be managed through the ASME Standards Technology, LLC (ASME ST-LLC) and involve significant industry, university and independent consultant activities. One of the tasks the Verification of Allowable Stresses in ASME Section III, Subsec
