ASTM A319-71(2006)

Standard Specification for Gray Iron Castings for Elevated Temperatures for Non-Pressure Containing Parts

ABSTRACT
This specification covers gray iron castings exposed to elevated temperatures for non-pressure containing parts such as grate bars, stoker links, stoker parts, oil still furnace parts, firebox parts, ingot molds, glass molds, caustic pots, and metal melting pots. The three classes of gray iron covered here are: Class I, possessing superior thermal shock resistance; Class II, possessing average thermal shock resistance and moderately good tensile strength; and Class III, possessing a higher tensile strength than either Classes I or II. It is the intention of this specification to classify the irons in accordance with their carbon content equivalent, wherein the equation for its calculation is given herein.
SCOPE
1.1 This specification covers three classes of gray iron suitable for castings exposed to temperatures encountered in such service as grate bars, stoker links, stoker parts, oil still furnace parts, firebox parts, ingot molds, glass molds, caustic pots, and metal melting pots.
Note 1—This specification is general, covering cast irons normally used for the above types of service, at temperatures as high as 1400oF (760oC). It is not intended to imply that all three classes are suitable throughout this entire temperature range without regard to actual service stresses. Some are suitable for long service at the lower temperatures only, unless low stresses are involved.
1.2 The three classes of gray iron covered by this specification are as follows:
1.2.1 Class I, possessing superior resistance to thermal shock,
1.2.2 Class II, possessing average resistance to thermal shock and a moderately good tensile strength (tensile strengths above 30 000 psi (207 MPa) may be expected), and
1.2.3 Class III, possessing a higher tensile strength than either Classes I or II (tensile strengths as high as 40 000 psi (276 MPa) may be expected).
1.3 The values stated in inch-pound units are to be regarded as the standard.

General Information

• Status: Historical
• Publication Date: 30-Sep-2006
• ICS: 77.140.80 - Iron and steel castings
• Technical Committee: A04 - Iron Castings
• Drafting Committee: A04.01 - Grey and White Iron Castings

Relations

• Replaces: ASTM A319-71(2001) - Standard Specification for Gray Iron Castings for Elevated Temperatures for Non-Pressure Containing Parts
• Effective Date: 01-Oct-2006
• Replaced By: ASTM A319-71(2011) - Standard Specification for Gray Iron Castings for Elevated Temperatures for Non-Pressure Containing Parts
• Effective Date: 01-Mar-2011
• Referred By: ASTM A834-95(2020) - Standard Specification for Common Requirements for Iron Castings for General Industrial Use
• Effective Date: 01-Oct-2006

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: A319 – 71 (Reapproved 2006)
Standard Specification for
Gray Iron Castings for Elevated Temperatures for Non-
Pressure Containing Parts
This standard is issued under the fixed designation A319; 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 4. Physical Requirements Physical Requirements
1.1 This specification covers three classes of gray iron 4.1 Some of the gray cast irons described in this specifica-
suitable for castings exposed to temperatures encountered in tion are deliberately made of a soft, low-strength iron for
such service as grate bars, stoker links, stoker parts, oil still resistance to thermal shock, and strength requirements are
furnace parts, firebox parts, ingot molds, glass molds, caustic unnecessary. For applications in which a strength requirement
pots, and metal melting pots. is essential, room temperature tensile strengths may be speci-
fied up to those prescribed for Class 40 in Specification
NOTE 1—This specification is general, covering cast irons normally
A48/A48M.
used for the above types of service, at temperatures as high as 1400°F
(760°C). It is not intended to imply that all three classes are suitable
5. Machinability
throughout this entire temperature range without regard to actual service
stresses. Some are suitable for long service at the lower temperatures only, 5.1 All machinable castings shall be limited in hardness at
unless low stresses are involved.
such locations on the castings as designated by the purchaser.
The maximum hardness at the locations on castings that are to
1.2 The three classes of gray iron covered by this specifi-
be machined shall be a matter of agreement between the
cation are as follows:
manufacturer and the purchaser.
1.2.1 Class I, possessing superior resistance to thermal
shock,
6. Chemical Composition
1.2.2 Class II, possessing average resistance to thermal
6.1 It is the intention of this specification to classify these
shock and a moderately good tensile strength (tensile strengths
irons in accordance with their carbon content equivalent
above 30 000 psi (207 MPa) may be expected), and
calculated as follows:
1.2.3 Class III, possessing a higher tensile strength than
either Classes I or II (tensile strengths as high as 40 000 psi
Carbon content equivalent 5 C 1 0.3 ~Si 1 P! (1)
(276 MPa) may be expected).
where:
1.3 The values stated in inch-pound units are to be regarded
C = carbon content, %,
as the standard.
Si = silicon content, %, and
P = phosphorus content, %,
2. Referenced Documents
2.1 ASTM Standards:
6.2 The carbon content equivalent and the minimum carbon
A48/A48M Specification for Gray Iron Castings
content for the various classes shall be as prescribed inTable 1.
Table 2 prescribes the allowable silicon ranges predicated on
3. Manufacture
the basis of various permissible carbon contents. It is recom-
3.1 The melting procedure shall be optional with the
mended that embrittling impurities be held to the following
foundry.
maximum limits:
Phosphorus, max, % 0.60
Sulfur, max, % 0.15
This specification is under the jurisdiction of ASTM Committee A04 on Iron
CastingsandisthedirectresponsibilityofSubcommitteeA04.01onGrayandWhite
6.3 The three basic classes may be alloyed with chromium.
Iron Castings.
When chromium is present as an alloying element, each class
Current edition approved Oct. 1, 2006. Published October 2006. Originally
approved in 1948. Last previous edition approved in 2001 asA319–71 (2001). DOI:
shall be subdivided into types designated as follows:
10.1520/A0319-71R06.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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A319 – 71 (2006)
TABLE 1 Chemical Requirements
analyses from any casting, test bar, or lot of castings
...