ASTM B752-97
(Specification)Standard Specification for Castings, Zirconium-Base, Corrosion Resistant, for General Application
Standard Specification for Castings, Zirconium-Base, Corrosion Resistant, for General Application
SCOPE
1.1 This specification covers zirconium and zirconium-alloy castings for general corrosion-resistant and industrial applications.
1.2 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
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Designation: B 752 – 97
Standard Specification for
Castings, Zirconium-Base, Corrosion Resistant, for General
Application
This standard is issued under the fixed designation B 752; 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 4.1.1 Description of the castings by pattern number or
drawing (dimensional tolerances shall be included on the
1.1 This specification covers zirconium and zirconium-alloy
casting drawing),
castings for general corrosion-resistant and industrial applica-
4.1.2 Quantity,
tions.
4.1.3 Grade Designation (see Table 1),
1.2 The values stated in inch-pound units are to be regarded
4.1.4 Options in the specification, and
as the standard. The values stated in brackets are for informa-
4.1.5 Supplementary requirements desired, including the
tion only.
standards of acceptance.
2. Referenced Documents
5. Materials and Manufacture
2.1 ASTM Standards:
5.1 Material for this specification shall be melted by con-
A 802/A802M Practice for Steel Castings, Surface Accep-
ventional processes used for reactive metals. Typical methods
tance Standards, Visual Examination
3 include the consumable electrode and inductoslag melting
E 8 Test Methods for Tension Testing of Metallic Materials
processes.
E 10 Test Method for Brinell Hardness of Metallic Materi-
als
6. Chemical Composition
E 18 Test Methods for Rockwell Hardness and Rockwell
3 6.1 Pour Analysis— An analysis of each pour shall be made
Superficial Hardness of Metallic Materials
4 by the producer from a sample such as a casting or test bar that
E 94 Guide for Radiographic Testing
is representative of the pour. The chemical composition deter-
E 142 Method for Controlling Quality of Radiographic
4 mined shall conform to the requirements specified for the
Testing
relevant grade in Table 1.
E 146 Methods for Chemical Analysis of Zirconium and
5 6.1.1 The elements listed in Table 1 are intentional alloying
Zirconium Alloys
additions of elements which are inherent to the manufacture of
E 165 Test Method for Liquid Penetrant Examination
primary zirconium, zirconium sponge, mill product or castings.
E 446 Reference Radiographs for Steel Castings Up to 2 in.
6.1.1.1 Elements other than those listed in Table 1 are
(51 mm) in Thickness
deemed to be capable of occurring in the grades listed in Table
3. Terminology 1 by and only by way of unregulated or unanalyzed scrap
additions to the pour. Therefore, pour analysis for elements not
3.1 Definitions of Terms Specific to This Standard:
listed in Table 1 shall be considered to be in excess of the intent
3.1.1 lot—shall consist of all castings of the same design
of this specification.
produced from the same pour.
6.2 When agreed upon by producer and purchaser and
3.1.2 pour—shall consist of all material melted and cast at
requested by the purchaser in his written purchase order,
one time.
chemical analysis shall be completed for specific residual
4. Ordering Information
elements not listed in this specification.
6.3 Product Analysis— A product analysis may be made by
4.1 Orders for castings to this specification shall include the
the purchaser on a representative casting from any lot. Because
following, as required to describe the requirements adequately.
of the possibility of oxygen or other interstitial contamination,
samples for oxygen, carbon, hydrogen, and nitrogen analysis
This specification is under the jurisdiction of ASTM Committee B-10 on
shall be taken no closer than ⁄4 in. [6.3 mm] to a cast surface
Reactive and Refractory Metals and Alloysand is the direct responsibility of
Subcommittee B10.05 on Castings. except that castings too thin for this shall be analyzed on
Current edition approved Oct. 10, 1997. Published February 1998. Originally
representative material. The chemical composition determined
published as B 752 – 85. Last previous edition B 752 – 91 (1995).
2 shall conform to the analysis in Table 1 within the check
Annual Book of ASTM Standards, Vol 01.02.
analysis variations shown in Table 2 or shall be subject to
Annual Book of ASTM Standards, Vol 03.01.
Annual Book of ASTM Standards, Vol 03.03.
rejection by the purchaser.
Discontinued—see 1990 Annual Book of ASTM Standards, Vol 03.05.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
B 752
A
TABLE 1 Chemical Requirements
acceptable surface discontinuities and finish. Unacceptable
Grade Designation, surface discontinuities shall be removed, and their removal
Composition, %
verified by visual examination of the resultant cavities.
702C 704C 705C
9. Repair by Welding
Zirconium and hafnium, 98.8 97.1 95.1
min.
9.1 If repairs are required, these shall be made using a
Hafnium, max 4.5 4.5 4.5
welding procedure and operators certified to quality require-
Iron and chro- 0.3 0.3 0.3
ments established by the producer. The procedures developed
mium, max
Hydrogen, max 0.005 0.005 0.005
shall be consistent with standard practices recommended for
Nitrogen, max 0.03 0.03 0.03
reactive metal alloys. The producer shall maintain documenta-
Carbon, max 0.1 0.1 0.1
Oxygen, max 0.25 0.3 0.3 tion on procedure and welder qualifications. Procedure modi-
Phosphorus, max 0.01 0.01 0.01
fications or special arrangements shall be as agreed upon
Tin . 1.0 to 2.0 .
between the producer and purchaser.
Niobium . . 2.0 to 3.0
9.2 Weld repairs shall be considered major in the case of a
A
By agreement between the purchaser and the producer, analysis may be
casting that has leaked on a hydrostatic test or when the depth
required and limits established for elements and compounds not specified in this
table.
of the cavity after preparation for repair exceeds 20 % of the
actual wall thickness or 1 in. [25 mm], whichever is smaller, or
TABLE 2 Check Analysis Tolerances
when the surface area of the cavity exceeds approximately 10
2 2
Permissible
in. [6500 mm ]. All other weld repairs shall be considered
Maximum
Variation
minor. Major and minor repairs shall be subject to the same
Element of Range,
in Check
Weight, %
quality standards as are used to inspect the castings.
Analysis
9.3 The composition of the deposited weld metal shall be
Nitrogen 0.03 + 0.006
within the chemical requirements for each grade established in
Carbon 0.10 + 0.02
Hydrogen 0.005 + 0.001
Table 1.
Iron and chromium 0.30 + 0.06
9.4 All castings with major weld repairs shall be stress
Oxygen 0.25 + 0.05
relieved after repair in accordance with 7.2. Stress relief after
Hafnium 4.50 + 0.50
Phosphorus 0.010 + 0.003
minor repairs is not required for grades 702C and 704C except
Tin 1.0 to 2.0 60.02
by agreement between the producer and the purchaser. Grade
Niobium 2.0 to 3.0 60.015
705C must be stress relieved after any weld repair.
Residuals 0.10 + 0.02
10. Inspection
6.4 Referee Analysis— In the event of disagreement be- 10.1 The producer shall afford the purchaser’s inspector all
tween the producer and purchaser concerning the analysis of reasonable facilities necessary to satisfy him that the material
any casting, Methods E 146 shall be used as a referee chemical is being produced and furnished in accordance with this
analysis method. specification. Foundry inspection by the purchaser shall not
interfere unnecessarily with the producer’s operations. All tests
7. Heat Treatment
and inspections, with the exception of product analysis (6.3),
7.1 Unless otherwise specified in the contract, all castings shall be made at the place of manufacture unless otherwise
will be supplied in the as-cast condition except when postweld
agreed upon.
heat treatment is required.
11. Rejection
7.2 If post-weld heat treatment is required, it shall consist of
a stress relief performed at 1050 6 50°F [566 6 28°C] for a 11.1 Any rejection based on test reports shall be reported to
1 1
minimum of ⁄2 h at temperature plus an additional ⁄2hat the producer within 60 days from the receipt of the test reports
by the purchaser.
temperature per inch of thickness for section sizes greater than
1 in. [25 mm]
...
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