ASTM A743/A743M-06(2010)

Standard Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application

ABSTRACT
This specification covers iron-chromium and iron-chromium-nickel alloy castings for general corrosion-resistant application. The grades of these castings represent types of alloy castings suitable for broad ranges of application which are intended for a wide variety of corrosion environments. The steel shall be made by the electric furnace process with or without separate refining such as argon-oxygen decarburization. The castings shall be subjected to heat treatment.
SCOPE
1.1 This specification covers iron-chromium and iron-chromium-nickel alloy castings for general corrosion-resistant application. The grades covered by this specification represent types of alloy castings suitable for broad ranges of application which are intended for a wide variety of corrosion environments.
Note 1—For alloy castings for severe corrosion-resistant service, reference should be made to Specification A744/A744M. For general heat-resistant alloy castings, reference should be made to Specification A297/A297M. For nickel alloy castings for corrosion-resistant service, reference should be made to Specification A494/A494M.  
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 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 A743 and SI units for material ordered to Specification A743M.

General Information

• Status: Historical
• Publication Date: 30-Sep-2010
• ICS: 77.140.80 - Iron and steel castings
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.18 - Castings

Relations

• Replaces: ASTM A743/A743M-06 - Standard Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application
• Effective Date: 01-Oct-2010
• Replaced By: ASTM A743/A743M-12 - Standard Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application
• Effective Date: 01-Nov-2012
• Referred By: ASTM A403/A403M-22b - Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings
• Effective Date: 01-Oct-2010
• Referred By: ASTM F998-12(2022) - Standard Specification for Centrifugal Pump, Shipboard Use
• Effective Date: 01-Oct-2010
• Referred By: ASTM A488/A488M-18e2 - Standard Practice for Steel Castings, Welding, Qualifications of Procedures and Personnel
• Effective Date: 01-Oct-2010
• Referred By: ASTM F1718-01(2019) - Standard Specification for Rotary Positive Displacement Distillate Fuel Pumps
• Effective Date: 01-Oct-2010
• Referred By: ASTM A781/A781M-21 - Standard Specification for Castings, Steel and Alloy, Common Requirements, for General Industrial Use
• Effective Date: 01-Oct-2010
• Referred By: ASTM A744/A744M-21a - Standard Specification for Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service
• Effective Date: 01-Oct-2010
• Referred By: ASTM A957/A957M-21 - Standard Specification for Investment Castings, Steel and Alloy, Common Requirements, for General Industrial Use
• Effective Date: 01-Oct-2010
• Referred By: ASTM F1510-21 - Standard Specification for Rotary Positive Displacement Pumps, Ships Use
• Effective Date: 01-Oct-2010
• Referred By: ASTM F1476-07(2019) - Standard Specification for Performance of Gasketed Mechanical Couplings for Use in Piping Applications
• Effective Date: 01-Oct-2010
• Referred By: ASTM F841-19 - Standard Specification for Thrusters, Tunnel, Permanently Installed in Marine Vessels
• Effective Date: 01-Oct-2010
• Referred By: ASTM F1548-01(2023) - Standard Specification for Performance of Fittings for Use with Gasketed Mechanical Couplings Used in Piping Applications
• Effective Date: 01-Oct-2010
• Referred By: ASTM A990/A990M-21 - Standard Specification for Castings, Iron-Nickel-Chromium and Nickel Alloys, Specially Controlled for Pressure-Retaining Parts for Corrosive Service
• Effective Date: 01-Oct-2010

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:A743/A743M −06(Reapproved 2010)
Standard Specification for
Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion
Resistant, for General Application
This standard is issued under the fixed designationA743/A743M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope* A494/A494M Specification for Castings, Nickel and Nickel
Alloy
1.1 This specification covers iron-chromium and iron-
A744/A744M Specification for Castings, Iron-Chromium-
chromium-nickel alloy castings for general corrosion-resistant
Nickel, Corrosion Resistant, for Severe Service
application. The grades covered by this specification represent
A781/A781M Specification for Castings, Steel and Alloy,
types of alloy castings suitable for broad ranges of application
Common Requirements, for General Industrial Use
which are intended for a wide variety of corrosion environ-
A890/A890M Specification for Castings, Iron-Chromium-
ments.
Nickel-Molybdenum Corrosion-Resistant, Duplex
NOTE 1—For alloy castings for severe corrosion-resistant service,
(Austenitic/Ferritic) for General Application
reference should be made to Specification A744/A744M. For general
A957 SpecificationforInvestmentCastings,SteelandAlloy,
heat-resistant alloy castings, reference should be made to Specification
Common Requirements, for General Industrial Use
A297/A297M. For nickel alloy castings for corrosion-resistant service,
reference should be made to Specification A494/A494M.
3. General Conditions for Delivery
1.2 The values stated in either inch-pound units or SI units
3.1 Except for investment castings, castings furnished to
are to be regarded separately as standard. Within the text, the
this specification shall conform to the requirements of Speci-
SI units are shown in brackets. The values stated in each
fication A781/A781M, including any supplementary require-
system are not exact equivalents; therefore, each system must
ments that are indicated on the purchase order. Failure to
be used independently of the other. Combining values from the
comply with the general requirements of Specification A781/
two systems may result in nonconformance with the specifi-
A781M constitutes nonconformance with this specification. In
cation. Inch-pound units are applicable for material ordered to
case of conflict between the requirements of this specification
Specification A743 and SI units for material ordered to
and Specification A781/A781M, this specification shall pre-
Specification A743M.
vail.
2. Referenced Documents
3.2 Steel investment castings furnished to this specification
shall conform to the requirements of Specification A957,
2.1 ASTM Standards:
including any supplementary requirements that are indicated in
A262 Practices for Detecting Susceptibility to Intergranular
the purchase order. Failure to comply with the general require-
Attack in Austenitic Stainless Steels
ments of Specification A957 constitutes nonconformance with
A297/A297M Specification for Steel Castings, Iron-
this specification. In case of conflict between the requirements
Chromium and Iron-Chromium-Nickel, Heat Resistant,
of this specification and Specification A957, Specification
for General Application
A957 shall prevail.
A370 Test Methods and Definitions for Mechanical Testing
of Steel Products
4. Ordering Information
4.1 Orders for material to this specification should include
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
the following, as required, to describe the material adequately:
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
4.1.1 Description of the casting by pattern number or
A01.18 on Castings.
drawing,
Current edition approved Oct. 1, 2010. Published December 2010. Originally
4.1.2 Grade,
approved in 1977. Last previous edition approved in 2006 as A743/A743M – 06.
DOI: 10.1520/A0743_A0743M-06R10.
4.1.3 Heat treatment,
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.1.4 Options in the specification,
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
4.1.5 Whether castings are to be produced using the invest-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. ment casting process, and
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A743/A743M−06 (2010)
4.1.6 Supplementary requirements desired, including the 6. Heat Treatment
standards of acceptance.
6.1 Castings shall be heat treated in accordance with the
requirements in Table 1
5. Process
5.1 The steel shall be made by the electric furnace process
with or without separate refining such as argon-oxygen decar-
burization (AOD).
TABLE 1 Heat Treatment Requirements
Grade Heat Treatment
CF8, CG3M, CG8M, CG12, CF20, Heat to 1900°F [1040°C] minimum, hold for sufficient time to heat casting to temperature, quench in water or rapid
CF8M, CF8C,CF16F, CF16Fa cool by other means.
CH10, CH20, CE30, CK20 Heat to 2000°F [1093°C] minimum, hold for sufficient time to heat casting to temperature, quench in water or rapid
cool by other means.
CA15, CA15M, CA40, CA40F (1) Heat to 1750°F [955°C] minimum, air cool and temper at 1100°F [595°C] minimum, or
(2) Anneal at 1450°F [790°C] minimum.
CB30, CC50 (1) Heat to 1450°F [790°C] minimum, and air cool, or
(2) Heat to 1450°F [790°C] minimum, and furnace cool.
CF3, CF3M, CF3MN (1) Heat to 1900°F [1040°C] minimum, hold for sufficient time to heat casting to temperature, and cool rapidly. (2)
As cast if corrosion resistance is acceptable.
CN3M Heat to 2150°F [1175°C] minimum, hold for sufficient time to heat casting to temperature, quench in water or rapid
cool by other means.
CN3MN Heat to 2100°F [1150°C] minimum, hold for sufficient time to heat casting to temperature, quench in water or rapid
cool by other means.
CN7M, CG6MMN 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 Heat to 2100°F [1150°C] minimum, 2150°F [1180°C] maximum, hold for sufficient time (2 h minimum) to heat
casting to temperature and quench in water.
CA6NM Heat to 1850°F [1010°C] minimum, air cool to 200°F [95°C] or lower prior to any optional intermediate temper and
prior to the final temper. The final temper shall be between 1050°F [565°C] and 1150°F [620°C].
CA6N Heat to 1900°F [1040°C], air cool, reheat to 1500°F [815°C], air cool, and age at 800°F [425°C], holding at each
temperature sufficient time to heat casting uniformly to temperature.
CF10SMnN Heat to 1950°F [1065°C] minimum, hold for sufficient time to heat casting to temperature, quench in water or rapid
cool by other means.
CA28MWV (1) Heat to 1875–1925°F [1025–1050°C], quench in air or oil, and temper at 1150°F [620°C] minimum, or
(2) Anneal at 1400°F [760°C] minimum.
CK3MCuN Heat to 2100°F [1150°C] minimum, hold for sufficient time to heat casting to temperature, quench in water or rapid
cool by other means.
CK35MN Heat to 2100-2190F [1150-1200C], hold for sufficient time to heat casting to temperature, quench in water or rapid
cool by other means.
CB6 Heat between 1800°F [980°C] and 1920°F [1050°C], forced air, cool to 120°F [50°C] maximum, and temper
between 1100°F and 1160°F [595°C and 625°C].
minimum time at temperature and then rapidly cool the castings in order
.
to enhance the corrosion resistance and meet mechanical properties.
NOTE 2—Proper heat treatment of these alloys is usually necessary to
enhance corrosion resistance and in some cases to meet mechanical
7. Chemical Requirements
properties. Minimum heat treat temperatures are specified; however, it is
sometimes necessary to heat treat at higher temperatures, hold for some 7.1 The chemical requirements are shown in Table 2
TABLE 2 Chemical Requirements
Composition, %
Grade
Man- Tung- Vana-
Type
Carbon, Silicon, Phospho- Sulfur, Molybde- Colum- Sele- Nitrogen
(UNS)
ganese, Chromium Nickel Copper sten, dium,
max max rus, max max num bium nium
max max max
CF8 19 Chromium, 0.08 1.50 2.00 0.04 0.04 18.0–21.0 8.0– . . . . . . .
(J92600)
9 Nickel 11.0
CG12 22 Chromium, 0.12 1.50 2.00 0.04 0.04 20.0–23.0 10.0– . . . . . . .
(J93001)
12 Nickel 13.0
CF20 19 Chromium, 0.20 1.50 2.00 0.04 0.04 18.0–21.0 8.0– . . . . . . .
(J92602)
9 Nickel 11.0
CF8M 19 Chromium, 0.08 1.50 2.00 0.04 0.04 18.0–21.0 9.0– 2.0–3.0 . . . . . .
(J92900)
10 Nickel, with 12.0
Molybdenum
A743/A743M−06 (2010)
TABLE 2 Continued
Composition, %
Grade
Man- Tung- Vana-
Type
Carbon, Silicon, Phospho- Sulfur, Molybde- Colum- Sele- Nitrogen
(UNS)
ganese, Chromium Nickel Copper sten, dium,
max max rus, max max num bium nium
max max max
A
CF8C 19 Chromium, 0.08 1.50 2.00 0.04 0.04 18.0–21.0 9.0– . . . . . .
(J92710)
10 Nickel, with 12.0
Columbium
CF16F 19 Chromium, 0.16 1.50 2.00 0.17 0.04 18.0–21.0 9.0– 1.50 max . 0.20– . . . .
(J92701)
9 Nickel, Free 12.0 0.35
Machining
CF16Fa 19 Chromium, 0.16 1.50 2.00 0.04 0.20– 18.0–21.0 9.0– 0.40–0.80 . . . . . .
9 Nickel, Free 0.40 12.0
Machining
CH10 25 Chromium, 0.10 1.50 2.00 0.04 0.04 22.0–26.0 12.0– . . . . . . . . .
(J93401)
12 Nickel 15.0
CH20 25 Chromium, 0.20 1.50 2.00 0.04 0.04 22.0–26.0 12.0– . . . . . . .
(J93402)
12 Nickel 15.0
CK20 25 Chromium, 0.20 2.00 2.00 0.04 0.04 23.0–27.0 19.0– . . . . . . .
(J94202)
20 Nickel 22.0
CE30 29 Chromium, 0.30 1.50 2.00 0.04 0.04 26.0–30.0 8.0– . . . . . . .
(J93423)
9 Nickel 11.0
CA15 12 Chromium 0.15 1.00 1.50 0.04 0.04 11.5–14.0 1.00 0.50 max . . . . . .
(J91150)
max
CA15M 12 Chromium 0.15 1.00 0.65 0.040 0.040 11.5–14.0 1.0 0.15–1.0 . . . . . .
(J91151)
max
B
CB30 20 Chromium 0.30 1.00 1.50 0.04 0.04 18.0–21.0 2.00 . . . . . .
(J91803)
max
CC50 28 Chromium 0.50 1.00 1.50 0.04 0.04 26.0–30.0 4.00 . . . . . . .
(J92615)
max
CA40 12 Chromium 0.20– 1.00 1.50 0.04 0.04 11.5–14.0 1.0 0.5 max . . . . . .
(J91153)
0.40 max
CA40F 12 Chromium, 0.20– 1.00 1.50 0.04 0.20– 11.5–14.0 1.0 0.5 max . . . . . .
(J91154)
Free Machining 0.40 0.40 max
CF3 19 Chromium, 0.03 1.50 2.00 0.04 0.04 17.0–21.0 8.0– . . . . . . .
(J92500)
9 Nickel 12.0
CF10SMnN 17 Chromium, 8.5 0.10 7.00– 3.50– 0.060 0.030 16.0–18.0 8.0– . . . . . . 0.08–
(J92972) Nickel with 9.00 4.50 9.0 0.18
Nitrogen
CF3M 19 Chromium, 0.03 1.50 1.50 0.04 0.04 17.0–21.0 9.0– 2.0–3.0 . . . . . .
(J92800)
10 Nickel, with 13.0
Molybdenum
CF3MN 19 Chromium, 0.03 1.50 1.50 0.040 0.040 17.0–22.0 9.0– 2.0–3.0 . . . . . 0.10–
(J92804) 10 Nickel, with 13.0 0.20
Molybdenum, and
Nitrogen
CG6MMN 0.06 4.00– 1.00 0.04 0.03 20.5–23.5 11.5– 1.50–3.00 0.10– . . . 0.10– 0.20–
(J93790) 6.00 13.5 0.30 0.30 0.40
CG3M 19 Chromium, 0.03 1.50 1.50 0.04 0.04 18.0–21.0 9.0– 3.0–4.0 . . . . . . . . . . . . . . . . . .
(J92999) 11 Nickel, with 13.0
Molybdenum
CG8M 19 Chromium, 0.08 1.50 1.50 0.04 0.04 18.0–21.0 9.0– 3.0–4.0 . . . . . .
(J93000)
11 Nickel, with 13.0
Molybdenum
CN3M 0.03 2.0 1.0 0.03 0.03 20.0–22.0 23.0– 4.5–5.5 . . . . . .
(J94652) 27.0
CN3MN 21 Chromium, 0.03 2.00 1.00 0.040 0.010 20.0–22.0 23.5– 6.0–7.0 . . 0.75 . . 0.18–
(J94651) 24 Nickel with 25.5 max 0.26
Molybdenum
and Nitrogen
CN7M 20 Chromium, 0.07 1.50 1.50 0.04 0.04 19.0–22.0 27.5– 2.0–3.0 . . 3.0– . . .
(N08007)
A743/A743M−06 (2010)
TABLE 2 Continued
Composition, %
Grade
Man- Tung- Vana-
Type
Carbon, Silicon, Phospho- Sulfur, Molybde- Colum- Sele- Nitrogen
(UNS)
ganese, Chromium Nickel Copper sten, dium,
max max rus, max max num bium nium
max max max
29 Nickel, with 30.5 4.0
Copper and
Molybdenum
CN7MS 19 Chromium, 0.07 1.00 2.50– 0.04 0.03 18.0–20.0 22.0– 2.5–3.0 . . 1.5– .
(J94650)
24 Nickel, with 3.50 25.0 2.0
Copper and
Molybdenum
CA6NM 12 Chromium, 0.06 1.00 1.00 0.04 0.03 11.5–14.0 3.5– 0.40–1.0 . . . . . .
(J91540)
4 Nickel 4.5
CA6N 11 Chromium, 0.06 0.50 1.00 0.02 0.02 10.5–12.5 6.0– . . . . . . .
7 Nickel 8.0
CA28MWV 12 Chromium, with 0.20– 0.50– 1.0 0.030 0.030 11.0–12.5 0.50– 0.90–1.25 . . . 0.90– 0.20– .
(J91422) Molybdenum, 0.28 1.00 1.00 1.25 0.30
Tungsten and
Vanadium
CK3MCuN 20 Chromium 0.025 1.20 1.00 0.045 0.010 19.5–20.5 17.5– 6.0–7.0 . . . . . . 0.50– . . . . . . 0.180–
(J93254) 18 Nickel, with 19.5 1.00 0.240
Copper and
Molybdenum
CK35MN 23 Chromium, 21 0.035 2.00 1.00 0.035 0.020 22.0-24.0 20.0- 6.0-6.8 . . . . . . 0.40 . . . . . . 0.21-0.32
Nickel, with 22.0
Molybdenum and
Nitrogen
CB6 16 Chromium, 0.06 1.00 1.00 0.04 0.03 15.5–17.5 3.5–5.5 0.5 max . . . . . . . . . . . . . . . . . .
(J91804) 4 Nickel
A
Grade CF8C shall have a columbium content of not less than eight times the carbon content and not more than 1.0%. If a columbium-plus-tantalum alloy in the
approximate Cb:Ta ratio of 3:1 is used for stabilizing this grade, the total columbium-plus-tantalum content shall not be less than nine times the carbon content and shall
not exceed 1.1%.
B
For Grade CB30 a copper content of 0.90 to 1.20% is optional.
.
8. Repair by Welding
8.1 Repair welding of Grade CA28MWV is not permitted when agreed upon between the manufacturer and the pur-
unless by agreement between the manufacturer and the pur- chaser. Weld repair on Grade CA40F is not recommended
chaser. because of the risk of local hardening and possible cracking in
the heat affected zone.
8.2 When methods involving high temperature are used in
8.3.2 Post weld heat treatment is not required on the other
the removal of discontinuities, castings shall be preheated in
grades of this specification. When post weld heat treatment is
accordance with Table 3. Weld repairs shall be subject to the
believed necessary for adequate corrosion resistance in the
same quality standards as are used to inspect the castings.
service environment, castings should be ordered in accordance
8.3 Post weld heat treatment, if required, shall be in accor-
with Specification A744/A744M.
dance with Table 1.
9. Product Marking
8.3.1 The martensitic grades CA6NM, CA15, CA15M,
CB6, and CA40 shall be retempered after weld repairing,
9.1 Castings shall be marked for material iden
...