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ASTM A874/A874M-98(2004)

(Specification)

Standard Specification for Ferritic Ductile Iron Castings Suitable for Low-Temperature Service

Standard Specification for Ferritic Ductile Iron Castings Suitable for Low-Temperature Service

ABSTRACT
This specification covers ductile iron castings suitable low temperature service. Castings shall be produced by casting or heat treatment and shall have essentially a ferritic structure that contains no massive carbides. The iron shall conform to the required chemical composition for carbon, silicon, phosphorus, magnesium, manganese, copper, nickel and chromium. The iron shall conform to the required tensile properties such as tensile strength, yield strength and elongation. Graphite contained in the microstructure shall be evaluated and the percentage of each graphite type shall be estimated. The surface of the casting shall be examined visually and shall be free from adhering sand, scale cracks, and hot tears.
SCOPE
1.1 This specification covers ductile iron castings suitable for service at temperatures of 40°F [-40°C] and above.
1.2 The values stated in either inch-pound 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 shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
1.3 The following precautionary statement pertains only to the test methods portion, Section , of this specification: 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.

General Information

Status
Historical
Publication Date
30-Sep-2004
ICS
77.140.80 - Iron and steel castings
Technical Committee
A04 - Iron Castings
Drafting Committee
A04.02 - Malleable and Ductile Iron Castings
Current Stage
Ref Project

Relations

Replaces
ASTM A874/A874M-98 - Standard Specification for Ferritic Ductile Iron Castings Suitable for Low-Temperature Service
Effective Date
01-Oct-2004
Replaced By
ASTM A874/A874M-98(2009) - Standard Specification for Ferritic Ductile Iron Castings Suitable for Low-Temperature Service
Effective Date
01-May-2009
Referred By
ASTM A834-95(2020) - Standard Specification for Common Requirements for Iron Castings for General Industrial Use
Effective Date
01-Oct-2004

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ASTM A874/A874M-98(2004) - Standard Specification for Ferritic Ductile Iron Castings Suitable for Low-Temperature ServiceASTM A874/A874M-98(2004) - Standard Specification for Ferritic Ductile Iron Castings Suitable for Low-Temperature Service
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ASTM A874/A874M-98(2004) - Standard Specification for Ferritic Ductile Iron Castings Suitable for Low-Temperature 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 874/A 874M – 98 (Reapproved 2004)
Standard Specification for
Ferritic Ductile Iron Castings Suitable for Low-Temperature
Service
ThisstandardisissuedunderthefixeddesignationA874/A874M;thenumberimmediatelyfollowingthedesignationindicatestheyear
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E689 Reference Radiographs for Ductile Iron Castings
E709 Guide for Magnetic Particle Examination
1.1 This specification covers ductile iron castings suitable
for service at temperatures of −40°F [–40°C] and above.
3. Ordering Information
1.2 The values stated in either inch-pound or SI units are to
3.1 Ordersformaterialunderthisspecificationshallinclude
beregardedseparatelyasstandard.Withinthetext,theSIunits
the following applicable information:
areshowninbrackets.Thevaluesstatedineachsystemarenot
3.1.1 Drawing, catalog number, or part identification,
exact equivalents; therefore, each system shall be used inde-
3.1.2 Quantity (weight or number of pieces),
pendentlyoftheother.Combiningvaluesfromthetwosystems
3.1.3 ASTM designation and year of issue,
may result in nonconformance with the specification.
3.1.4 Marking instructions (see Section 15),
1.3 The following precautionary statement pertains only to
3.1.5 Place of inspection (see 13.1),
the test methods portion, Section 11, of this specification: This
3.1.6 Limits on residual elements (see 5.2),
standard does not purport to address all of the safety concerns,
3.1.7 Visual and dimensional acceptance standard (see 7.1),
if any, associated with its use. It is the responsibility of the user
3.1.8 Sampling plan (see Section 9), and
of this standard to establish appropriate safety and health
3.1.9 Supplementary requirements.
practices and determine the applicability of regulatory limita-
tions prior to use.
4. Materials and Manufacture
4.1 Castings may be supplied either as cast or heat treated
2. Referenced Documents
and shall have essentially a ferritic structure that contains no
2.1 ASTM Standards:
massive carbides.
A247 Test Method for Evaluating the Microstructure of
Graphite in Iron Castings
5. Chemical Composition
E8 Test Methods for Tension Testing of Metallic Materials
5.1 Theironshallconformtotherequirementsforchemical
E30 Test Methods for Chemical Analysis of Steel, Cast
composition shown in Table 1.
Iron, Open-Hearth Iron, and Wrought Iron
5.2 By agreement between the manufacturer and purchaser,
E59 PracticeforSamplingSteelandIronforDetermination
analysis may be required and limits established for elements
of Chemical Composition
not specified in Table 1.
E94 Guide for Radiographic Examination
E165 Test Method for Liquid Penetrant Examination
6. Mechanical and Microstructural Properties
E351 Test Methods for Chemical Analysis of Cast Iron—
6.1 Tensile Properties—The iron shall conform to the re-
All Types
quirements for tensile properties shown in Table 2.
E562 Test Method for Determining Volume Fraction by
6.2 Microstructure—Graphite contained in the microstruc-
Systematic Manual Point Count
ture shall be evaluated in accordance with Test MethodA247.
The percent of each graphite type shall be estimated, and the
This specification is under the jurisdiction of ASTM Committee A04 on Iron
total of all estimates shall equal 100%. The total percent of
Castings and is the direct responsibility of SubcommitteeA04.02 on Malleable and
Types 1 and 2 graphite shall be a minimum of 90%.
Ductile Iron Castings.
Current edition approved Oct. 1, 2004. Published October 2004. Originally
7. Workmanship, Finish, and Appearance
approved in 1989. Last previous edition approved in 1998 as A874/A874M-98.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
7.1 The surface of the casting shall be examined visually
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
and shall be free from adhering sand, scale, cracks, and hot
Standards volume information, refer to the standard’s Document Summary page on
tears. Other surface discontinuities shall meet visual and
the ASTM website.
Withdrawn. dimensional acceptance standards specified in the order.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A 874/A 874M – 98 (2004)
TABLE 1 Chemical Composition
11. Test Methods
Element Minimum, % Maximum, %
11.1 Conduct the tension test in accordance with Test
Total carbon 3.0 3.7
MethodsE8.
Carbon equivalent (carbon + ⁄3 silicon) . . . 4.5
11.2 Determinetheyieldstrengthusingoneofthefollowing
Silicon 1.2 2.3
methods:
Phosphorous . . . 0.03
Magnesium . . . 0.07
11.2.1 The 0.2% offset method, or
Manganese . . . 0.25
11.2.2 Extension under load method where the yield
Copper . . . 0.1
strength may be determined as the stress producing an elonga-
Nickel . . . 1.0
Chromium . . . 0.07
tion under load of 0.330%, that is, 0.0066 in. [0.165 mm] in a
gage length of 2 in. [50 mm].
11.3 Determine the percent of each graphite nodule type by
TABLE 2 Tensile Properties
manual coating, semi-automatic, or automatic image analysis
Tensile Strength, Yield Strength, Elongation in 2 in. [50 mm],
methods. The manual count method shall prevail when the
min, psi [MPa] min, psi [MPa] min, %
resultsofothermethodsdiffer.Magnificationshallbeat100 3.
45 000 [300] 30 000 [200] 12 [12]
11.4 Spectrometric methods may be used for chemical
analysis. Should a dispute arise concerning chemical compo-
sition, use Test Methods E351 andE30 for referee methods.
7.2 Conditioning of castings is permitted to the extent that
12. Records
the removal of metal does not extend into the envelope of the
12.1 Records of the chemical composition, mechanical
finishedcontaineranddoesnotalterthepropertiesofthemetal
properties, and the metallographic examination shall be sys-
remaining in the finished container.
tematically made and maintained.
8. Repair
13. Inspection
8.1 Castings shall not be re
...

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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.  
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