ASTM B493/B493M-14(2019)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:B493/B493M −14 (Reapproved 2019)
Standard Specification for
Zirconium and Zirconium Alloy Forgings
This standard is issued under the fixed designation B493/B493M; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope hammers, presses, or forging machines; a lot shall consist of a
materialofthesamesize,shape,condition,andfinishproduced
1.1 This specification covers three grades of zirconium and
from the same ingot or powder blend by the same reduction
zirconium alloy forgings (see 4.1).
schedule and the same heat treatment parameters. Unless
1.2 The values stated in either SI units or inch-pound units
otherwise agreed between manufacturer and purchaser, a lot
are to be regarded separately as standard. The values stated in
shall be limited to the product of an 8-h period for final
each system may not be exact equivalents; therefore, each
continuous anneal, or to a single furnace load for final batch
system shall be used independently of the other. Combining
anneal.
values from the two systems may result in non-conformance
with the standard.
4. Classification
1.3 The following safety hazards caveat pertains only to the
4.1 The forgings are furnished in three grades as follows:
test method portion, Section 12, of this specification: This
4.1.1 Grade R60702—Unalloyed zirconium.
standard does not purport to address all of the safety concerns,
4.1.2 Grade R60704—Zirconium-tin alloy.
if any, associated with its use. It is the responsibility of the user
4.1.3 Grade R60705—Zirconium-niobium alloy.
of this standard to establish appropriate safety, health, and
environmental practices and determine the applicability of
5. Ordering Information
regulatory limitations prior to use.
5.1 Orders for material under this specification shall include
1.4 This international standard was developed in accor-
the following information:
dance with internationally recognized principles on standard-
5.1.1 Quantity (weight and number of pieces),
ization established in the Decision on Principles for the
5.1.2 Name of material (zirconium forgings),
Development of International Standards, Guides and Recom-
5.1.3 Finish (Section 9),
mendations issued by the World Trade Organization Technical
5.1.4 Dimension (diameter, thickness, length, width, or as
Barriers to Trade (TBT) Committee.
specified in appropriate drawings),
5.1.5 ASTM designation and year of issue,
2. Referenced Documents
5.1.6 Grade number (see 4.1), and
2.1 ASTM Standards:
5.1.7 Additions to the specification and supplementary
E8/E8M Test Methods for Tension Testing of Metallic Ma-
requirements, if required, including, but not limited to: product
terials
marking (see 17.1), check analysis (see 7.3), inspection (see
13.1), lot definition (see 3.1.1), internal soundness (see S1.1),
3. Terminology
and surface quality (see S2.1) requirements.
3.1 Lot Definition:
NOTE 1—A typical ordering description is as follows: 8000-lb zirco-
3.1.1 forgings, n—parts, including semi-finished products,
nium forgings, mechanically descaled, 100 mm by 120 mm by 1.2 m
or complex shapes, produced by hot mechanical work using
rectangular bar, ASTM B493/B493M – 08, Grade R60702.
6. Materials and Manufacture
This specification is under the jurisdiction of ASTM Committee B10 on
Reactive and Refractory Metals and Alloys and is the direct responsibility of
6.1 The forgings shall be formed with conventional forging
Subcommittee B10.02 on Zirconium and Hafnium.
equipment normally found in primary ferrous and nonferrous
Current edition approved April 1, 2019. Published May 2019. Originally
metal plants.
approved in 1969. Last previous edition approved in 2014 as B493/B493M – 14.
DOI: 10.1520/B0493_B0493M-14R19.
6.2 Forgings shall be furnished in the annealed conditions.
For ASME Boiler and Pressure Vessel Code applications see related Specifi-
cation SB-493 in Section II of that Code.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 7. Chemical Composition
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
7.1 The material shall conform to the requirements as to
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. chemical composition prescribed in Table 1.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B493/B493M−14 (2019)
A
TABLE 1 Chemical Requirements TABLE 3 Tensile Requirements
Composition, %
UNS Grade Designation
R60702 R60704 R60705
Element UNS Grade Designation
Tensile strength, min, MPa [ksi] 380 [55] 415 [60] 485 [70]
R60702 R60704 R60705
Yield strength, min, MPa [ksi] 205 [30] 240 [35] 380 [55]
B
Zirconium + hafnium, min 99.2 97.5 95.5
Elongation in 50 mm [2 in.], 16 14 16
A
Hafnium, max 4.5 4.5 4.5
gauge min, %
Iron + chromium 0.2 max 0.2 to 0.4 0.2 max
A
Whenasub-sizespecimenisused,thegaugelengthshallbeasspecifiedinTest
Tin . 1.0 to 2.0 .
Methods E8/E8M for that specimen.
Hydrogen, max 0.005 0.005 0.005
Nitrogen, max 0.025 0.025 0.025
Carbon, max 0.05 0.05 0.05
Niobium . . 2.0 to 3.0
Oxygen 0.16 0.18 0.18
11.2 Two chemistry tests for hydrogen and nitrogen content
A
By agreement between the purchaser and the manufacturer, analysis may be
shall be performed on each lot of finished product.
required and limits established for elements and compounds not specified in the
table of chemical composition.
11.3 Retests:
B
Zirconium is determined by difference.
11.3.1 If any sample or specimen exhibits obvious surface
contamination or improper preparation disqualifying it as a
truly representative sample, it shall be discarded and a new
TABLE 2 Permissible Variation in Check Analysis Between
sample or specimen substituted.
Different Laboratories
11.3.2 If the results of any tests of any lot do not conform to
Permissible Variation
Element
in Product Analysis, % the requirements specified, retests shall be made on additional
Hydrogen 0.002 forgings of double the original number from the same lot, each
Nitrogen 0.01
of
...