ASTM A447/A447M-11
(Specification)Standard Specification for Steel Castings, Chromium-Nickel-Iron Alloy (25-12 Class), for High-Temperature Service
Standard Specification for Steel Castings, Chromium-Nickel-Iron Alloy (25-12 Class), for High-Temperature Service
ABSTRACT
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]. The purchaser should inform the manufacturer when the service temperatures are to exceed 1800°F [980°C].
1.2 In the absence of significant proportions of elements other than those prescribed in Section 4, 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 non-conformance with the standard.
1.3.1 Within the text, the SI units are shown in brackets.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: A447/A447M −11
StandardSpecification for
Steel Castings, Chromium-Nickel-Iron Alloy (25-12 Class),
1
for High-Temperature Service
This standard is issued under the fixed designationA447/A447M; 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.
1. Scope* Estimating Ferrite Content Thereof
A957 Specification for Investment Castings, Steel andAlloy,
1.1 This specification covers iron-base, heat-resisting alloy
Common Requirements, for General Industrial Use
castings of the 25 % chromium, 12 % nickel class, intended for
A1067 Specification for Test Coupons for Steel Castings
structural elements, containers, and supports in electric
E8/E8M Test Methods for Tension Testing of Metallic Ma-
furnaces, petroleum still tube supports, and for similar appli-
terials
cations up to 2000°F [1095°C].
E21 TestMethodsforElevatedTemperatureTensionTestsof
1.2 In the absence of significant proportions of elements
Metallic Materials
other than those prescribed in Section 5, the two types of alloys
coveredbythisspecificationmayingeneralbedistinguishedas
3. General Conditions for Delivery
follows:
1.2.1 Type I—Alloys characterized by relatively low limit- 3.1 Except for investment castings, material furnished to
ingcreepstressattemperaturesbetween1500and2000°F[815
this specification shall conform to the requirements of Speci-
and 1095°C], and relatively high ductility at ordinary tempera- fication A781/A781M, including any supplementary require-
tures after aging for short periods at temperatures between
ments that are indicated in the purchase order. Failure to
1300 and 1500°F [705 and 815°C].
comply with the general requirements of Specification A781/
1.2.2 Type II—Alloys having relatively high limiting creep
A781M constitutes nonconformance with this specification. In
stress but which may develop low ductility at ordinary tem-
case of conflict between the requirements of this specification
peratures when aged for short periods at temperatures between
and Specification A781/A781M, this specification shall pre-
1350 and 1500°F [730 and 815°C].
vail.
1.3 The values stated in either SI units or inch-pound units
3.2 Investment castings furnished to this specification shall
are to be regarded separately as standard. The values stated in
conform to the requirements of Specification A957, including
each system may not be exact equivalents; therefore, each
any supplementary requirements that are indicated in the
system shall be used independently of the other. Combining
purchase order. Failure to comply with the general require-
values from the two systems may result in non-conformance
ments of Specification A957 constitutes nonconformance with
with the standard.
this specification. In the case of conflict between the require-
1.3.1 Within the text, the SI units are shown in brackets.
ments of this specification and Specification A957, Specifica-
tion A957 shall prevail.
2. Referenced Documents
2
2.1 ASTM Standards:
4. Ordering Information
A781/A781M Specification for Castings, Steel and Alloy,
4.1 The inquiry and order should include or indicate the
Common Requirements, for General Industrial Use
following:
A800/A800M Practice for Steel Casting, Austenitic Alloy,
4.1.1 A description of the casting by pattern number or
drawing (dimensional tolerances shall be included on the
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
casting drawing),
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
4.1.2 Which standard (A447 or A447M) applies,
A01.18 on Castings.
Current edition approved Oct. 1, 2011. Published November 2011. Originally
4.1.3 The version of the alloy, i.e., Type I or Type II, to be
approved in 1944. Redesignated as A447 in 1961. Last previous edition approved in
supplied (Sections 1, 11, 12, 13, and 14).
2010 as A447/A447M – 10. DOI: 10.1520/A0447_A0447M-11.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.1.4 Options in the specification (Section 9), and
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.1.5 The supplementary requirements desired including the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. standards of acceptance.
*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
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A447/A447M − 11
5. Process 10. Retests
5.1 The alloy for the castings shall be made by the electric-
10.
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:A447/A447M–10 Designation: A447/A447M – 11
Standard Specification for
Steel Castings, Chromium-Nickel-Iron Alloy (25-12 Class),
1
for High-Temperature Service
This standard is issued under the fixed designationA447/A447M; 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.
1. 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]. The purchaser should inform the manufacturer when the service temperatures are to exceed 1800°F [980°C].
1.2 In the absence of significant proportions of elements other than those prescribed in Section 45, 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 non-conformance with the standard.
1.3.1 Within the text, the SI units are shown in brackets.
1.4This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
A781/A781M Specification for Castings, Steel and Alloy, Common Requirements, for General Industrial Use
A800/A800M Practice for Steel Casting, Austenitic Alloy, Estimating Ferrite Content Thereof
A957 Specification for Investment Castings, Steel and Alloy, Common Requirements, for General Industrial Use
A1067 Specification for Test Coupons for Steel Castings
E88/E8M Test Methods for Tension Testing of Metallic Materials
E21 Test Methods for Elevated Temperature Tension Tests of Metallic Materials
3. General Conditions for Delivery
3.1Material furnished to this specification shall conform to the requirements of Specification
3.1 Except for investment castings, material furnished to this specification shall conform to the requirements of Specification
A781/A781M, including any supplementary requirements that are indicated in the purchase order. Failure to comply with the
generalrequirementsofSpecificationA781/A781Mconstitutesnonconformancewiththisspecification.Incaseofconflictbetween
the requirements of this specification and Specification A781/A781M, this specification shall prevail.
4.
3.2 Investment castings furnished to this specification shall conform to the requirements of Specification A957, including any
supplementary requirements that are indicated in the purchase order. Failure to comply with the general requirements of
1
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of SubcommitteeA01.18
on Castings.
Current edition approved Oct. 1, 2010.2011. Published November 2010.2011. Originally approved in 1944. Redesignated asA447 in 1961. Last previous edition approved
in 20072010 as A447/A447M–93(2007).A447/A447M – 10. DOI: 10.1520/A0447_A0447M-101.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book ofASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*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.
1
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