ASTM A744/A744M-00(2004)
(Specification)Standard Specification for Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service
Standard Specification for Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service
SCOPE
1.1 This specification covers iron-chromium-nickel alloy, stainless steel castings intended for particularly severe corrosive applications.
1.2 This specification requires postweld heat-treatment of all weld repairs affecting surfaces intended to be wetted by the corrosive medium. For applications for which postweld heat-treatment is not considered mandatory for retention of acceptable corrosion resistance, refer to Specification A743/A743M.
Note 1—For general corrosion-resistant alloy castings, reference should be made to Specification A743/A743M. For general heat-resistant alloy castings, reference should be made to Specification A297/A297M. For nickel-base alloy castings, refer to Specification A494/A494M.
1.3 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 must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. Inch-pound units are applicable for material ordered to Specification A744 and SI units for material ordered to Specification A744M.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: A 744/A 744M – 00 (Reapproved 2004)
Standard Specification for
Castings, Iron-Chromium-Nickel, Corrosion Resistant, for
Severe Service
This standard is issued under the fixed designationA 744/A 744M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope A 494/A 494M Specification for Castings, Nickel and
Nickel Alloy
1.1 This specification covers iron-chromium-nickel alloy,
A 732/A 732M Specification for Castings, Investment, Car-
stainless steel castings intended for particularly severe corro-
bon and Low-Alloy Steel for General Application, and
sive applications.
Cobalt Alloy for High Strength at Elevated Temperatures
1.2 This specification requires postweld heat-treatment of
A 743/A 743M Specification for Castings, Iron-Chromium,
all weld repairs affecting surfaces intended to be wetted by the
Iron-Chromium-Nickel, Corrosion-Resistant, for General
corrosive medium. For applications for which postweld heat-
Application
treatment is not considered mandatory for retention of accept-
A 781/A 781M Specification for Castings, Steel and Alloy,
ablecorrosionresistance,refertoSpecificationA 743/A 743M.
Common Requirements, for General Industrial Use
NOTE 1—For general corrosion-resistant alloy castings, reference
E 29 Practice for Using Significant Digits in Test Data to
should be made to SpecificationA 743/A 743M. For general heat-resistant
Determine Conformance With Specifications
alloy castings, reference should be made to Specification A 297/A 297M.
2.2 American Welding Society Standards:
For nickel-base alloy castings, refer to Specification A 494/A 494M.
AWS A5.11 Specification for Nickel and NickelAlloy Cov-
1.3 The values stated in either inch-pound units or SI units
ered Welding Electrodes
are to be regarded separately as standard. Within the text, the
AWS A5.14 Specification for Nickel and NickelAlloy Bare
SI units are shown in brackets. The values stated in each
Welding Rods and Electrodes
system are not exact equivalents; therefore, each system must
be used independently of the other. Combining values from the
3. Terminology
two systems may result in nonconformance with the specifi-
3.1 Definitions of Terms Specific to This Standard:
cation. Inch-pound units are applicable for material ordered to
3.1.1 wetted surface, n—one that contacts a corrosive envi-
Specification A 744 and SI units for material ordered to
ronment.
Specification A 744M.
4. General Conditions for Delivery
2. Referenced Documents
4.1 Material furnished to this specification shall conform to
2.1 ASTM Standards:
the requirements of Specification A 781/A 781M, including
A 262 Practices for Detecting Susceptibility to Intergranu-
any supplementary requirements that are indicated on the
lar Attack in Austenitic Stainless Steels
purchase order. Failure to comply with the general require-
A 297/A 297M Specification for Steel Castings, Iron-
ments of Specification A 781/A 781M constitutes nonconfor-
Chromium and Iron-Chromium-Nickel, Heat-Resistant,
mance with this specification. In case of conflict between the
for General Application
requirements of this specification and Specification A 781/
A 370 Test Methods and Definitions for MechanicalTesting
A 781M, this specification shall prevail.
of Steel Products
5. Ordering Information
5.1 Orders for material to this specification should include
the following, as required, to describe the material adequately:
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
5.1.1 Description of the casting by pattern number or
A01.18 on Castings.
drawing (dimensional tolerances shall be included on the
Current edition approved Oct. 1, 2004. Published October 2004. Originally
e1 casting drawing),
approved in 1977. Last previous edition approved in 2000 asA 744/A 744M – 00 .
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Available from The American Welding Society (AWS), 550 NW LeJeune Rd.,
the ASTM website. Miami, FL 33126.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A 744/A 744M – 00 (2004)
5.1.2 Grade, ER NiCrMo-4 or ER NiCrMo-10, or the composition of the
5.1.3 Heat treatment, deposited weld metal shall be similar to that of AWS A5.11 E
5.1.4 Identify wetted surface(s), NiCrMo-3 or E NiCrMo-4 or E NiCrMo-10 when postweld
5.1.5 Options in the specification, and heat treatment is or is not required.
5.1.6 Supplementary requirements desired, including the 10.2 Weld repairs shall be considered major in the case of a
standards of acceptance. casting that has leaked on hydrostatic test or when the depth of
the cavity after preparation for repair exceeds 20 % of the
6. Process
actual wall thickness, or 1 in. [25 mm], whichever is smaller,
or when the extent of the cavity exceeds approximately 10
6.1 Alloys shall be melted by the electric furnace process
2 2
with or without separate refining, such as argon-oxygen- in. [65 cm ].All other weld repairs shall be considered minor.
Major and minor weld repairs shall be subject to the same
decarburization (AOD).
quality standards as are used to inspect the castings. When
7. Heat Treatment
methods involving high temperatures are used in the removal
of discontinuities, castings shall be preheated to 50°F [10°C]
7.1 Castings shall be heat treated in accordance with the
min.
requirements in Table 1.
10.3 Castings shall be postweld heat treated in accordance
NOTE 2—Proper heat treatment of these alloys is usually necessary to
with Table 1 after all major weld repairs and after those minor
enhance corrosion resistance and in some cases to meet mechanical
weld repairs involving either of the following conditions: (1)
properties. Minimum heat-treat temperatures are specified; however, it is
welding on a wetted surface, or (2) welding that heats a wetted
sometimes necessary to heat treat at higher temperatures, hold for some
minimum time at temperature and then rapidly cool the castings in order surface to or above 800°F [425°C].
to enhance the corrosion resistance and meet mechanical properties.
NOTE 3—The maximum wetted surface temperature of 800°F [425°C]
permitted on minor weld repairs without subsequent heat treatment for the
8. Chemical Requirements
austenitic grades is necessary to avoid sensitization to intergranular
8.1 The materials shall conform with the chemical require-
corrosion. Minor repairs of this type can be made by using a low heat
ments prescribed in Table 2.
input (example, 50 000 J/in.) welding process or by cooling wetted
surfaces with water during welding, or both. Wetted surface temperature
9. Workmanship, Finish, and Appearance
measurement can be accomplished with temperature-indicating crayon or
contact pyrometer.
9.1 Machined welding ends shall be suitably protected
against damage during shipping.
11. Rejection and Rehearing
11.1 Samples that represent rejected material shall be pre-
10. Repair by Welding
served for two weeks from the date of transmission of the
10.1 The composition of the deposited weld metal shall be
rejectionreport.Incaseofdissatisfactionwiththeresultsofthe
similar to that of the casting except in grade CK3MCuN. In the
tests, the manufacturer may make claim for a rehearing within
case of Grade CK3MCuN, the composition of the deposited
that time.
metal shall be similar to that of AWS A5.14 ER NiCrMo-3
(UNS NO6625) or AWS A5.11 E NiCrMo-3 (UNS W 86112)
12. Product Marking
when postweld heat treatment is not required, and the compo-
sitionofthedepositedmetalshallbeeithersimilartothatofthe 12.1 Castings shall be marked for material identification
base metal or similar to that of AWS A5.14 ER NiCrMo-3 or with the ASTM specification number (A 744/A 744M) and
AWS A5.11 E NiCrMo-3 when postweld heat treatment is grade symbol, that is, CF8, CN7M, etc. In addition, the
required. manufacturer’s name or identification mark and the pattern
10.1.1 Thecompositionofthedepositedweldmetalshallbe number shall be cast or stamped using low-stress stamps on all
similar to that of the casting except in grade CN3MN. In the castings.Small-sizecastingsmaybesuchthatmarkingmustbe
case of grade CN3MN, the composition of the deposited weld limited consistent with the available area. The marking of heat
metal shall be similar to that of AWS A5.14 ER NiCrMo-3 or numbers on individual castings shall be agreed upon by the
TABLE 1 Heat Treatment Requirements
Grade Heat Treatment
CF8 (J92600), CG8M (J93000), CF8M (J92900), Heat to 1900°F [1040°C] minimum, hold for sufficient time to heat casting to temperature, quench in water
CF8C (J92710), CF3 (J92500), CF3M (J92800), or rapid cool by other means.
A
CG3M (J92999)
CN7M (N08007) Heat to 2050°F [1120°C] minimum, hold for sufficient time to heat casting to temperature, quench in water
or rapid cool by other means.
CN7MS (J94650) Heat to 2100°F [1150°C] min, 2150°F [1180°C] max, hold for sufficient time (2 h min) to heat casting to
temperature, and quench in water.
CN3MN J94651 Heat to 2100°F [1150°C] minimum, hold for sufficient time to heat casting to temperature, quench in water
or cool rapidly by other means.
CK3MCuN (J93254) Heat to 2100°F [1150°C
...
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