ASTM G146-01

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Designation: G 146 – 01
Standard Practice for
Evaluation of Disbonding of Bimetallic Stainless Alloy/Steel
Plate for Use in High-Pressure, High-Temperature Refinery
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Hydrogen Service
This standard is issued under the fixed designation G 146; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 1.5 The values stated in SI units are to be regarded as the
standard.
1.1 This practice describes a procedure for the evaluation of
1.6 This standard does not purport to address all of the
disbonding of bimetallic stainless alloy/steel plate for use in
safety concerns, if any, associated with its use. It is the
refinery high-pressure/high-temperature (HP/HT) gaseous hy-
responsibility of the user of this standard to establish appro-
drogen service. It includes procedures to (a) produce suitable
priate safety and health practices and determine the applica-
laboratory test specimens, (b) obtain hydrogen charging con-
bility of regulatory limitations prior to use. See Section 6 for
ditions in the laboratory that are similar to those found in
additional safety information.
refinery HP/HT hydrogen gas service for evaluation of bime-
tallic specimens exposed to these environments, and (c) per-
2. Referenced Documents
form analysis of the test data. The purpose of this practice is to
2.1 ASTM Standards:
allow for comparison of data among test laboratories on the
G 111 Guide for Corrosion Tests in High-Temperature or
resistance of bimetallic stainless alloy/steels to hydrogen-
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High-Pressure Environment, or Both
induced disbonding (HID).
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E 3 Practice for Preparation of Metallographic Specimens
1.2 This practice applies primarily to bimetallic products
2.2 ASME Standard:
fabricated by weld overlay of stainless alloy onto a steel
Boiler and Pressure Vessel Code Section V,Article 5, Tech-
substrate. Most of the information developed using this prac-
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nique Two
tice has been obtained for such materials. The procedures
described herein, may also be appropriate for evaluation of hot
3. Terminology
roll bonded, explosive bonded, or other suitable processes for
3.1 Definitions:
applying stainless alloys on steel substrates. However, due to
3.1.1 HID—a delamination of a stainless alloy surface layer
the broad range of possible materials, test conditions, and
from its steel substrate produced by exposure of the material to
variations in test procedures, it is up to the user of this practice
a hydrogen environment.
to determine the suitability and applicability of these proce-
3.1.2 Discussion—This phenomenon can occur in internally
dures for evaluation of such materials.
stainless alloy lined steel equipment by the accumulation of
1.3 This practice is intended to be applicable for evaluation
molecular hydrogen in the region of the metallurgical bond at
of materials for service conditions involving severe hydrogen
the interface between the steel and stainless alloy surface layer
charging which may produce HID as shown in Fig. 1 for
produced by exposure to service conditions involving HP/HT
stainless steel weld overlay on steel equipment (see Refs 1 and
hydrogen in the refinery hydroprocessing.
2 in Appendix X1). However, it should be noted that this
practice may not be appropriate for forms of bimetallic
4. Summary of Practice
construction or service conditions which have not been ob-
4.1 Stainless alloy/steel specimens are exposed to a gaseous
served to cause HID in service.
hydrogen containing environment at HP/HT conditions for
1.4 Additional information regarding the evaluation of bi-
sufficient time to produce hydrogen charging in the material.
metallic stainless alloy/steel plate for HID, test methodologies,
Following exposure, the specimens are cooled to ambient
and the effects of test conditions, materials, and welding
temperatureatacontrolledrate.Thespecimensarethenheldat
variables, and inspection techniques is given in Appendix X1.
room temperature for a designated period to allow for the
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This practice is under the jurisdiction of ASTM Committee G01 on Corrosion
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of Metals and is the direct responsibility of Subcommittee G01.05 on Laboratory Annual Book of ASTM Standards, Vol 03.02.
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Corrosion Tests. Annual Book of ASTM Standards, Vol 03.01.
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Current edition approved Oct. 10, 2001. Published December 2001. Originally Available from American Society of Mechanical Engineers, 345 E. 47th St.,
published as G 146 - 96. Last previous edition G 146 - 96. New York, NY 10017.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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