ML20147D453
| ML20147D453 | |
| Person / Time | |
|---|---|
| Issue date: | 03/02/1988 |
| From: | Conway J Office of Nuclear Reactor Regulation |
| To: | Partlow J Office of Nuclear Reactor Regulation |
| References | |
| REF-QA-99902007 NUDOCS 8803040025 | |
| Download: ML20147D453 (5) | |
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6 UNITED STATES NUCLEAR REGULATORY COMMISSION
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March 2, 1988 Docket No. 99902007 James G. Partlow, Director Division of Reactor Inspection and Safeguards MEMORANDUM FOR:
Office of Nuclear Reactor Regulation CMJames C. Stone, Acting Chief THROUGH:
Vendor Inspection Branch f
Division of Reactor Inspection and Safeguards Office of Nuclear Reactor Regulation James T. Conway, Metallurgical Engineer Program Development and Reactive Inspection Section FROM:
Vendor Inspection Branch Division of Reactor Inspection and Safeguards Office of Nuclear Reactor Regulation MEETING WITH ALLEGHENY LUDLUM (AL) CORPORAT 5
SUBJECT:
On February 4, 1988, the staff met with AL for a tutorial presentation o A sumary of the intro-alloy "E-Brite 26-1" and similar ferritic alloys.
duction and closing remarks by the Director, Customer Relations a 1
presentations by a Marketing and Product Development Manager, a f
Specialist, and a Senior Welding Engineer are as follows.
E-Brite 26-1 which is designated ASTM XM-27 and UNS S44627, is a h ferritic stainless steel alloy produced by AL and contains a high chromium jd The alloy was (26 percent) and extremely low carbon and nitrogen contant.
originally developed and fabricated by Airco Vacuum Metals until 197 the patent rights were purchased by AL.
The American Iron & Steel Institute recognizes 57 grades of stainless In the ferritic class, AL produces six different alloys de:,ignated "super Three Registered Trademark alloys (E-Brite, 29-4, and 29-4-2) are vacuum induction melted, and the other three alloys (26-15, 29-4C, fercitics."
Alloy 29-4C is also Registered Trademark and 2 are stabilized.
properties of each alloy and the corrosion characteristics of these Trademark Alloy.
a variety of different environments.
Three An overview of the physical metallurgy of ferritic alloys was presented.
intermetallic phases (sigma, chi, and alpha prime) will impair i
corrosion resistance properties."885*F embrittlement" which is experien 700*-1100*F.
ferritic alloys on extended exposure to temperatures in the range f
8803040025 880302 H
l OA999 ENVALGL PDR DCD 99902007
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.. March 2, 1988 James G. Partlow Carbon and nitrogen will "tie up" the chromium thus lowering the toughness and corrosion resistance of the alloy. The addition of titanium and columbium will stabilize the ferritic alloys by the fonnation of carbides and nitrides.
Small amounts of columbium are added to E-Brite to provide stabilization against sensitization and intergranular corrosion and to improve weld ductility.
E-Brite is vacuum induction melted and refined to produce low levels of carbon and nitrogen.
A video tape showed charpy V-notch impact testing and the mechanics of determining the ductile to brittle transition temperatures (DBTT).
The "super ferritics" including E-Brite exhibit a transition from ductile to brittle fracture in The DBTT will decrease as the impact tests as their temperature is lowered.The effect of strain rate (i.e., slow bending section thickness decreases.
Other metallurgical characteristics vs. impact) will shift the transition curve.
that effect DBTT are grain size, cold work, inclusions, crack orientation, and alloying elements.
Sound weldments are being made in E-Brite when special precautions are taken to clean the base material and to avoid the pick-up of carbon and nitrogen.
Weld joint designs for E-Brite are essentially the same as used for the Cr-Ni The use of tungsten inert gas (TIG) produces tough and stainless grades.
ductile weldments. Welding to dissimilar metals can be achieved by using appropriate filler material.
E-Brite tubing is produced at AL's Tubular Products Division in Claremore, Skelp is formed into tube on weld mill forming equipment. Continuous, Oklahoma.
welding (TIG-Argon shielded) backed by in-line eddy current weld monitoring and testing (e.g., crush, flare, and reverse bend) ensure the integrity of the weld.
i Major applications of E-Brite are in chemical processing, oil refinery, and food processing industries and specifically in caustic, nitric acid, organic acid, and stress corrosion environments.
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- Cames T. Conway, Metallu cal Engineer d rogram Development and R ctive Inspection Section Vendor Inspection Branch Division of Reactor Inspection and Safeguards Office of Nuclear Reactor Regulation
Enclosure:
Technical Literature (8 documents) from AL l
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Attendees Tit 1e.
Name NRC R. E. Johnson Task Manager.
E. 0, Woolridge' Materials Engineer -
W. S. Hazelton Section Chief Branch Chief C. Y. Cheng Senior Metallurgist C. D. Sellers J. W. Shapaker Technical Assistant Acting Branch Chief J. C. Stone Metallurgical Engineer J. T. Conway B. Grimes Deputy Director J..Guillen Reactor Engineer D. Driskill Director Acting Section Chief E. Baker I. Bukulmez Engineer.
O.L.
J. D. Walton General Counsel & Secretary Director, Customer Relations J. V. Bosco J. F. Grubb Research Sepcialist J. M. Beigay Senior Welding Engineer H. E. Deverell Marketing and Product Development Manager Marketing and Product Develo,, ment Manager J. R. Maurer OTHER W. D. Doty Consultant
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