skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Fabrication of modified 9 Cr-1 Mo steel test article for exposure in sodium components test loop at Energy Technology Engineering Center

Abstract

The fabrication, inspection, shipment, and mechanical properties of a modified 9 Cr-1 steel test article for exposure in the Sodium Components Test Loop (SCTL) at the Energy Technology Engineering Center (ETEC) are described. The test article delivered consisted of modified 9 Cr-1 Mo steel pipe 232 mm in diameter by 12.7-mm wall by 610 mm long. This pipe was safe ended with type 304L stainless steel spool pieces 152 mm long on each end. The joint between modified 9 Cr-1 Mo and type 304L was made with ERNiCr-3 filler wire. The entire test article was postweld heat treated 1 h at 732/sup 0/C and ultrasonically inspected before use. Radiography was used to inspect the welds between modified 9 Cr-1 Mo and type 304L stainless steel. The test article was delivered to ETEC on schedule on October 4, 1982. After delivery of the test article, we fabricated an additional piece of the same dimensions by the same procedure for archive purposes, mechanical property testing, and comparison with the actual test article after test. A part of this archive piece also provided a nondestructive examination standard for in-service inspection for ETEC. The archive specimen has already been subjected to tensile and creepmore » testing, microstructural evaluation, and thermal aging for 2000 h at 510/sup 0/C. The test article has completed a year of operation in the SCTL. We expect to remove this pipe after three years of operation for testing and examination.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (USA)
OSTI Identifier:
5044603
Report Number(s):
ORNL-6034
ON: DE84010643
DOE Contract Number:
W-7405-ENG-26
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions are illegible in microfiche products. Original copy available until stock is exhausted
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHROMIUM-MOLYBDENUM STEELS; FABRICATION; MECHANICAL PROPERTIES; COOLANT LOOPS; CREEP; INSPECTION; METALLOGRAPHY; PIPES; TENSILE PROPERTIES; ALLOYS; CHROMIUM ALLOYS; CHROMIUM STEELS; COOLING SYSTEMS; ENERGY SYSTEMS; IRON ALLOYS; IRON BASE ALLOYS; STEELS; 360100* - Metals & Alloys

Citation Formats

Sikka, V.K., Goodwin, G.M., King, J.F., and Cook, K.V. Fabrication of modified 9 Cr-1 Mo steel test article for exposure in sodium components test loop at Energy Technology Engineering Center. United States: N. p., 1984. Web. doi:10.2172/5044603.
Sikka, V.K., Goodwin, G.M., King, J.F., & Cook, K.V. Fabrication of modified 9 Cr-1 Mo steel test article for exposure in sodium components test loop at Energy Technology Engineering Center. United States. doi:10.2172/5044603.
Sikka, V.K., Goodwin, G.M., King, J.F., and Cook, K.V. Sun . "Fabrication of modified 9 Cr-1 Mo steel test article for exposure in sodium components test loop at Energy Technology Engineering Center". United States. doi:10.2172/5044603. https://www.osti.gov/servlets/purl/5044603.
@article{osti_5044603,
title = {Fabrication of modified 9 Cr-1 Mo steel test article for exposure in sodium components test loop at Energy Technology Engineering Center},
author = {Sikka, V.K. and Goodwin, G.M. and King, J.F. and Cook, K.V.},
abstractNote = {The fabrication, inspection, shipment, and mechanical properties of a modified 9 Cr-1 steel test article for exposure in the Sodium Components Test Loop (SCTL) at the Energy Technology Engineering Center (ETEC) are described. The test article delivered consisted of modified 9 Cr-1 Mo steel pipe 232 mm in diameter by 12.7-mm wall by 610 mm long. This pipe was safe ended with type 304L stainless steel spool pieces 152 mm long on each end. The joint between modified 9 Cr-1 Mo and type 304L was made with ERNiCr-3 filler wire. The entire test article was postweld heat treated 1 h at 732/sup 0/C and ultrasonically inspected before use. Radiography was used to inspect the welds between modified 9 Cr-1 Mo and type 304L stainless steel. The test article was delivered to ETEC on schedule on October 4, 1982. After delivery of the test article, we fabricated an additional piece of the same dimensions by the same procedure for archive purposes, mechanical property testing, and comparison with the actual test article after test. A part of this archive piece also provided a nondestructive examination standard for in-service inspection for ETEC. The archive specimen has already been subjected to tensile and creep testing, microstructural evaluation, and thermal aging for 2000 h at 510/sup 0/C. The test article has completed a year of operation in the SCTL. We expect to remove this pipe after three years of operation for testing and examination.},
doi = {10.2172/5044603},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Apr 01 00:00:00 EST 1984},
month = {Sun Apr 01 00:00:00 EST 1984}
}

Technical Report:

Save / Share:
  • Modified 9 Cr-1 Mo steel is being developed and commercialized jointly by ORNL and Combustion Engineering (CE), Chattanooga Tennessee, as an alternate steam generator material for breeder reactors. The alloy has been commercially melted by the argon-oxygen decarburization (AOD) process and refined by electroslag remelting (ESR). It has also been commercially fabricated into plate, bar, tube hollows, and centrifugally cast and cold-pilgered tubes. The purpose of this study was to develop procedures for fabricating tubes of various sizes by cold-reducing and drawing processes. Fabricated tubes were subjected to microstructural analysis, hardness measurements, and ultrasonic inspection.
  • This report presents elevated-temperature test results and comparisons with analytic predictions for a simply supported modified 9 Cr-1 Mo steel beam subjected to a controlled center deflection history. The test was performed to provide an assessment of structural analysis methods and material relations for modified 9 Cr-1 Mo steel. The inelastic analysis predictions were obtained using the finite-element code ADINA. The analysis was done using a nonlinear, time-independent plasticity model and a creep strain-hardening model for the constitutive equations. The test contained three constant-deflection hold periods for a total of 504 h at a a temperature of 573{sup 0}C (1100{supmore » 0}F). The beam specimen was fabricated using plate stock of the modified 9 Cr-1 Mo steel at heat 30383. The structural deformation responses in terms of load and strain were measured during the test; results are provided in graphical form.« less
  • We review various aspects of time-dependent fatigue behavior of 2 1/4 Cr-1 Mo steel. Specifically, the roles of dynamic strain aging, environmental interaction, and classical creep damage (voidage) are discussed. Examples of results from exploratory test efforts show the strong waveform-environment synergism that occurs in this material. Plans are presented for future exploratory time-dependent fatigue testing of 2 1/4 Cr-1 Mo steel. Results indicate that the continuous-cycle fatigue resistance of modified 9 Cr-1 Mo is superior to that of standard 9 Cr-1 Mo steel and annealed 2 1/4 Cr-1 Mo steel in the high-cycle region. Limited results from time-dependent fatiguemore » tests on modified 9 Cr-1 Mo steel have indicated that compressive hold periods are more damaging than tensile holds and that cyclic waveform effects similar to those seen in 2 1/4 Cr-1 Mo steel also occur in modified 9 Cr-1 Mo steel. 26 figures, 5 tables.« less
  • A steam generator, wherein the boiler, steam drum, and superheater are integrated into one single unit, requires the welding of a transition joint between the 2 1/4% Cr-1% Mo steel of the steam drum and the type 316 stainless steel of the superheater. A practicable procedure was developed for the welding of this transition joint and the properties of the weld were evaluated by mechanical testing and metallurgical evaluation. After evaluating the technical aspects of the project and their relation to the fabrication of the generator, it was considered desirable to overlay the welding edge of the 2 1/4% Cr-1%more » Mo steel with a suitable austenitic weld metul which would subsequently be welded to the type 316 stainless steel of the superheater. Austenitic stainless steel and high-nickel alloy weld metals were evaluated for the overlay; whereas only austenitic stainless steel weld metals were evaluated for the final weld joining the components. It was concluded that type 309 stainless steel weld metal deposited automatically by the submergedarc process is completely satisfactory for cladding the 2 1/4% Cr-1% Mo base metal and for making the final transition weld joining the steam drum and superheater sections of the generator. Supplementary mechanical tests, metallographic examinations, and hardness surveys further attested to the adequacy of the quality of the transition joint resulting from the procedures developed by this program. A detailed fabrication and thermal treatment specification is included for the welding of a transition joint between« less