ASTM A747/A747M-99

Standard Specification for Steel Castings, Stainless, Precipitation Hardening

SCOPE
1.1 This specification covers iron-chromium-nickel-copper corrosion-resistant steel castings, capable of being strengthened by precipitation hardening heat treatment.  
1.2 These castings may be used in services requiring corrosion resistance and high strengths at temperatures up to 600°F [315°C]. They may be machined in the solution-annealed condition and subsequently precipitation hardened to the desired high-strength mechanical properties specified in Table 1 with little danger of cracking or distortion.  
1.3 The material is not intended for use in the solution-annealed condition. Note-If the service environment in which the material is to be used is considered conducive to stress-corrosion cracking, precipitation hardening should be performed at a temperature that will minimize the susceptibility of the material to this type of attack.
1.4 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.

General Information

• Status: Historical
• Publication Date: 09-May-1999
• ICS: 77.140.80 - Iron and steel castings
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.18 - Castings

Relations

• Replaced By: ASTM A747/A747M-04 - Standard Specification for Steel Castings, Stainless, Precipitation Hardening
• Effective Date: 01-Sep-2004
• Referred By: ASTM A957/A957M-21 - Standard Specification for Investment Castings, Steel and Alloy, Common Requirements, for General Industrial Use
• Effective Date: 10-May-1999
• Referred By: ASTM F998-12(2022) - Standard Specification for Centrifugal Pump, Shipboard Use
• Effective Date: 10-May-1999
• Referred By: ASTM A781/A781M-21 - Standard Specification for Castings, Steel and Alloy, Common Requirements, for General Industrial Use
• Effective Date: 10-May-1999
• Referred By: ASTM F1718-01(2019) - Standard Specification for Rotary Positive Displacement Distillate Fuel Pumps
• Effective Date: 10-May-1999
• Referred By: ASTM C1572/C1572M-23 - Standard Guide for Dry Lead Glass and Oil-Filled Lead Glass Radiation Shielding Window Components for Remotely Operated Facilities
• Effective Date: 10-May-1999
• Referred By: ASTM A488/A488M-18e2 - Standard Practice for Steel Castings, Welding, Qualifications of Procedures and Personnel
• Effective Date: 10-May-1999

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: A 747/A747M – 99
Standard Specification for
Steel Castings, Stainless, Precipitation Hardening
This standard is issued under the fixed designation A 747/A747M; 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 E 353 Test Methods for Chemical Analysis of Stainless,
Heat-Resisting, Maraging, and Other Similar Chromium-
1.1 This specification covers iron-chromium-nickel-copper
Nickel-Iron Alloys
corrosion-resistant steel castings, capable of being strength-
2.2 ASME Standard:
ened by precipitation hardening heat treatment.
ASME Boiler and Pressure Vessel Code, Supplementary
1.2 These castings may be used in services requiring corro-
Requirements S6, S14, and S27
sion resistance and high strengths at temperatures up to 600°F
[315°C]. They may be machined in the solution-annealed
3. General Conditions for Delivery
condition and subsequently precipitation hardened to the de-
3.1 Material furnished to this specification shall conform to
sired high-strength mechanical properties specified in Table
the requirements of Specification A 781/A 781M, including
S14.1 with little danger of cracking or distortion.
any supplementary requirements that are indicated in the
1.3 The material is not intended for use in the solution-
purchase order. Failure to comply with the general require-
annealed condition.
ments of Specification A 781/A 781M constitutes nonconfor-
NOTE 1—If the service environment in which the material is to be used
mance with this specification. In case of conflict between the
is considered conducive to stress-corrosion cracking, precipitation hard-
requirements of this specification and Specification A 781/
ening should be performed at a temperature that will minimize the
A 781M, this specification shall prevail.
susceptibility of the material to this type of attack.
1.4 The values stated in either inch-pound units or SI units 4. Ordering Information
are to be regarded separately as standard. Within the text, the
4.1 Orders for material to this specification should include
SI units are shown in brackets. The values stated in each
the following:
system are not exact equivalents; therefore, each system must
4.1.1 Specification number and grade (Table 1),
be used independently of the other. Combining values from the
4.1.2 Heat treatment condition (SA, H900, etc.), Table 2,
two systems may result in nonconformance with the specifi-
4.1.3 Drawing or pattern,
cation.
4.1.4 Options in the specification, if any, in accordance with
5.2, 6.3, and Section 7, and
2. Referenced Documents
4.1.5 Supplementary requirements, if any, including the
2.1 ASTM Standards:
standards of acceptance.
A 370 Test Methods and Definitions for Mechanical Testing
4.1.6 Notice when the castings are to be used in equipment
of Steel Products
covered by the ASME Boiler and Pressure Vessel Code,
A 732/A732M Specification for Castings, Investment, Car-
Supplementary Requirements S6, S14, and S27 are mandatory
bon and Low Alloy Steel for General Application, and
and must be specified in the purchase order.
Cobalt Alloy for High Strength at Elevated Temperatures
A 781/A781M Specification for Castings, Steel and Alloy,
5. Materials and Manufacture
Common Requirements, for General Industrial Use
5.1 The steel shall be made by the electric furnace process
E 38 Methods for Chemical Analysis of Nickel-Chromium
with or without separate refining such as argon-oxygen decar-
and Nickel-Chromium-Iron Alloys
burization (AOD).
5.2 Heat Treatment—Castings may be given a homogeni-
zation heat treatment in accordance with 5.2.1 at the producer’s
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
option or when specified by the purchaser (see S26) prior to
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
A01.18 on Castings. solution heat treatment. All castings, whether homogenized or
Current edition approved Apr. 10, 1999. Published May 1999. Originally
published as A 747 – 77. Last previous edition A 747/A 747M – 93(1998).
Annual Book of ASTM Standards, Vol 01.03.
3 5
Annual Book of ASTM Standards, Vol 01.02. Available from American Society of Mechanical Engineers, 345 E. 47th St.,
Annual Book of ASTM Standards, Vol 03.05. New York, NY 10017.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A 747/A747M – 99
A
TABLE 1 Chemical Requirements
5.2.2 Solution annealing heat treatment shall consist of
heating the castings and test material to 1925°F [1050°C] 6
CB7Cu-1 CB7Cu-2
50°F [30°C], holding the 30 min/in. [1.2 min/mm] of section
Carbon 0.07 0.07
but not less than 30 min, and cooling to below 90°F [30°C].
Manganese 0.70 0.70
5.2.3 Temperature used for precipitation hardening shall be
Phosphorus 0.035 0.035
Sulfur 0.03 0.03
maintained within the range of 6 25°F [6 15°C] of that listed
Silicon 1.00 1.00
in Table 2 for the heat treatment condition ordered. (See Note.)
Chromium 15.50–17.70 14.0–15.50
5.2.4 When the order of contract specifies a minimum
Nickel 3.60–4.60 4.50–5.50
Copper 2.50–3.20 2.50–3.20
columbium content, the minimum precipitation hardening
B B
Columbium 0.15–0.35 0.15–0.35
temperature shall be 925°F [495°C].
C
Nitrogen 0.05 0.05
A 6. Chemical Composition
Limits are percent maximum unless shown as a range or stated otherwise.
B
See 6.2. When the H900 condition is ordered the minimum columbium content
6.1 The steel shall conform to the requirements as to
shall not apply.
C
chemical composition prescribed in Table 1.
To be determined and reported when specified by the order or contract.
6.2 When the H900 condition is ordered, the minimum
A,B
columbium content (Table 1) shall not apply. It is recom-
TABLE 2 Precipitation Hardening Heat Treatment
mended that columbium other than that in revert material not
C
Condition PH Temperature, °F[°C] Time, h and min Cooling Treatment
be added.
SA Not precipitation hardened (see 5.2.3) 6.3 Methods of Analysis—Analytical procedures for nitro-
H900 900 [480] 1.5 air cool
gen analysis are not included in Methods E 38 or Test Methods
H925 925 [495] 1.5 air cool
E 353, so if the contract or order specifies that the nitrogen
H1025 1025 [550] 4.0 air cool
H1075 1075 [580] 4.0 air cool
content is to be reported, the method of analysis shall be agreed
H1100 1100 [595] 4.0 air cool
upon by purchaser and producer.
H1150 1150 [620] 4.0 air cool
H1150M 1400 [760] 2.0 air cool
1150 [620] 4.0 air cool
7. Repair by Welding
H1150 DBL 1150 [620] 4.0 air cool
7.1 Repairs shall be made only in one of the following
1150 [620] 4.0 air cool
conditions: homogenized, solution annealed, H1100, H1150,
A
The furnace and controls used shall be calibrated and capable of uniformity of H1150M, H1150DBL, or stress relieved at 1150°F 6 25°F
heating in order to ensure consistent results.
[620°C 6 15°C] for a minimum of 4 h.
B
See Note.
C
7.2 Castings welded in one of the aged conditions noted in
6 25°F [15°C].
7.1 shall be post weld heat treated by the same aging treatment
used prior to welding, or, where necessary to meet mechanical
not, shall be given
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