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ASTM A744/A744M-98

(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.

General Information

Status
Historical
Publication Date
09-Sep-2000
ICS
77.140.80 - Iron and steel castings
Technical Committee
A01 - Steel, Stainless Steel and Related Alloys
Drafting Committee
A01.18 - Castings
Current Stage
Ref Project

Relations

Replaced By
ASTM A744/A744M-00 - Standard Specification for Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service
Effective Date
10-Sep-2000

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ASTM A744/A744M-98 - Standard Specification for Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe ServiceASTM A744/A744M-98 - Standard Specification for Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service
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ASTM A744/A744M-98 - Standard Specification for Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service
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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 744/A744M – 98 An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
Castings, Iron-Chromium-Nickel, Corrosion Resistant, for
1
Severe Service
This standard is issued under the fixed designation A 744/A744M; 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.
3
1. Scope Cobalt Alloy for High Strength at Elevated Temperatures
A 743/A743M Specification for Castings, Iron-Chromium,
1.1 This specification covers iron-chromium-nickel alloy,
Iron-Chromium-Nickel, Corrosion-Resistant, for General
stainless steel castings intended for particularly severe corro-
3
Application
sive applications.
A 781/A781M Specification for Castings, Steel and Alloy,
1.2 This specification requires postweld heat-treatment of
3
Common Requirements, for General Industrial Use
all weld repairs affecting surfaces intended to be wetted by the
E 29 Practice for Using Significant Digits in Test Data to
corrosive medium. For applications for which postweld heat-
4
Determine Conformance With Specifications
treatment is not considered mandatory for retention of accept-
2.2 American Welding Society Standards:
able corrosion resistance, refer to Specification A 743/A 743M.
AWS A5.11 Specification for Nickel and Nickel Alloy Cov-
NOTE 1—For general corrosion-resistant alloy castings, reference 5
ered Welding Electrodes
should be made to Specification A 743/A 743M. For general heat-resistant
AWS A5.14 Specification for Nickel and Nickel Alloy Bare
alloy castings, reference should be made to Specification A 297/A 297M.
5
Welding Rods and Electrodes
For nickel-base alloy castings, refer to Specification A 494/A 494M.
1.3 The values stated in either inch-pound units or SI units
3. Terminology
are to be regarded separately as standard. Within the text, the
3.1 Definitions of Terms Specific to This Standard:
SI units are shown in brackets. The values stated in each
3.1.1 wetted surface, n—one that contacts a corrosive envi-
system are not exact equivalents; therefore, each system must
ronment.
be used independently of the other. Combining values from the
two systems may result in nonconformance with the specifi- 4. General Conditions for Delivery
cation. Inch-pound units are applicable for material ordered to
4.1 Material furnished to this specification shall conform to
Specification A 744 and SI units for material ordered to
the requirements of Specification A 781/A 781M, including
Specification A 744M.
any supplementary requirements that are indicated on the
purchase order. Failure to comply with the general require-
2. Referenced Documents
ments of Specification A 781/A 781M constitutes nonconfor-
2.1 ASTM Standards:
mance with this specification. In case of conflict between the
A 262 Practices for Detecting Susceptibility to Intergranu-
requirements of this specification and Specification A 781/
2
lar Attack in Austenitic Stainless Steels
A 781M, this specification shall prevail.
A 297/A297M Specification for Steel Castings, Iron-
Chromium and Iron-Chromium-Nickel, Heat-Resistant, 5. Ordering Information
3
for General Application
5.1 Orders for material to this specification should include
A 370 Test Methods and Definitions for Mechanical Testing
the following, as required, to describe the material adequately:
2
of Steel Products
5.1.1 Description of the casting by pattern number or
A 494/A494M Specification for Castings, Nickel and
drawing (dimensional tolerances shall be included on the
3
Nickel Alloy
casting drawing),
A 732/A732M Specification for Castings, Investment, Car-
5.1.2 Grade,
bon and Low-Alloy Steel for General Application and
5.1.3 Heat treatment,
5.1.4 Options in the specification, and
1
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
5.1.5 Supplementary requirements desired, including the
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
A01.18 on Castings.
Current edition approved May 10, 1998. Published October 1998. Originally
4
published as A 744 – 77. Last previous edition A 744/A 744M – 96. Annual Book of ASTM Standards, Vol 14.02.
2 5
Annual Book of ASTM Standards, Vol 01.03. Available from American Welding Society, P.O. Box 351040, 550 N.W.
3
Annual Book of ASTM Standards, Vol 01.02. LeJeune Rd., Miami, FL 33135.
1

---------------------- Page: 1 ----------------------
A 744/A744M
standards of acceptance. 10.2 Weld repairs shall b
...

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This specification covers standards for iron-chromium and iron-chromium-nickel alloy castings of general purpose grades (Grades HF, HH, HI, HK, HE, HT, HU, HW, HX, HC, HD, HL, HN, and HN) applicable in heat-resistant services. Alloys shall be produced through electric arc, electric-induction, or other approved processes. Heat-treatment shall be conducted when agreed upon by the manufacturer and purchaser. The material shall conform to carbon, manganese, silicon, phosphorus, sulfur, chromium, nickel, and molybdenum contents. Tensile requirements including tensile strength, yield point, and elongation shall apply when specified in the purchase order. Guidelines for repair by welding are also given.
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This specification covers low-alloy steel and martensitic stainless steels in the normalized and tempered, or quenched and tempered conditions, suitable for pressure-containing parts. All castings shall receive the specified heat treatment requirement: austenitizing temperature, medium, quenching cool, and tempering temperature. Preliminary heat treatment and multiple tempering are permitted. Recording-type pyrometers shall be used to control the furnace temperature. The steel shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, molybdenum, vanadium, boron, and copper. Residual elements include: copper, nickel, chromium, tungsten, molybdenum, and vanadium. Tensile properties of the steel shall conform to the requirements for tensile strength, yield strength, elongation, reduction of area, hardness, and maximum thickness. Product analysis tolerance is specified. Repair by welding may be done.
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1.1 This specification2 covers low-alloy steels and martensitic stainless steels in the normalized and tempered, or quenched and tempered, condition suitable for pressure-containing parts. The weldability of the classes in this specification varies from readily weldable to weldable only with adequate precautions, and the weldability of each class should be considered prior to assembly by fusion welding.  
1.2 Selection will depend on design, mechanical, and service conditions. Users should note that hardenability of some of the grades mentioned may restrict the maximum size at which the required mechanical properties are obtained.  
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.  
1.3.1 Within the text, the SI units are shown in brackets.  
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1.4 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.

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This specification covers iron-base, heat-resisting alloy castings, intended for structural elements, containers, and supports in electric furnaces, petroleum still tube supports, and for similar applications. The alloys shall be electric-furnace processed and heat treated. The castings shall conform to the required chemical compositions of nickel, chromium, carbon, nitrogen, manganese, silicon, phosphorus, sulfur, and iron. The specimens shall undergo tension test after aging and short-time high-temperature tension test and shall conform to the required values of tensile strength and elongation. A stress-rupture test shall also be performed wherein the specimens shall conform to the required values of tensile stress. The specimen shall also conform to the required values of magnetic permeability.
SCOPE
1.1 This specification covers iron-base, heat-resisting alloy castings of the 25 % chromium, 12 % nickel class, intended for structural elements, containers, and supports in electric furnaces, petroleum still tube supports, and for similar applications up to 2000 °F [1095 °C].  
1.2 In the absence of significant proportions of elements other than those prescribed in Section 5, the two types of alloys covered by this specification may in general be distinguished as follows:  
1.2.1 Type I—Alloys characterized by relatively low limiting creep stress at temperatures between 1500 and 2000 °F [815 and 1095 °C], and relatively high ductility at ordinary temperatures after aging for short periods at temperatures between 1300 and 1500 °F [705 and 815 °C].  
1.2.2 Type II—Alloys having relatively high limiting creep stress but which may develop low ductility at ordinary temperatures when aged for short periods at temperatures between 1350 and 1500 °F [730 and 815 °C].  
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.  
1.3.1 Within the text, the SI units are shown in brackets.  
1.4 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.

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