ASTM A319-71(1995)

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

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 30000 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 40000 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: 31-Dec-2000
• Technical Committee: A04 - Iron Castings
• Drafting Committee: A04.01 - Grey and White Iron Castings

Relations

• Replaced By: ASTM A319-71(2001) - Standard Specification for Gray Iron Castings for Elevated Temperatures for Non-Pressure Containing Parts
• Effective Date: 01-Jan-2001

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NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn.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 319 – 71 (Reapproved 1995)
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
Gray Iron Castings for Elevated Temperatures for Non-
Pressure Containing Parts
This standard is issued under the fixed designation A 319; 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.
1. Scope is essential, room temperature tensile strengths may be
specified up to those prescribed for Class 40 in Specification
1.1 This specification covers three classes of gray iron
A 48.
suitable for castings exposed to temperatures encountered in
such service as grate bars, stoker links, stoker parts, oil still
5. Machinability
furnace parts, firebox parts, ingot molds, glass molds, caustic
5.1 All machinable castings shall be limited in hardness at
pots, and metal melting pots.
such locations on the castings as designated by the purchaser.
NOTE 1—This specification is general, covering cast irons normally
The maximum hardness at the locations on castings that are to
used for the above types of service, at temperatures as high as 1400°F
be machined shall be a matter of agreement between the
(760°C). It is not intended to imply that all three classes are suitable
manufacturer and the purchaser.
throughout this entire temperature range without regard to actual service
stresses. Some are suitable for long service at the lower temperatures only,
6. Chemical Composition
unless low stresses are involved.
6.1 It is the intention of this specification to classify these
1.2 The three classes of gray iron covered by this specifi-
irons in accordance with their carbon content equivalent
cation are as follows:
calculated as follows:
1.2.1 Class I, possessing superior resistance to thermal
Carbon content equivalent 5C 1 0.3 ~Si 1 P! (1)
shock,
1.2.2 Class II, possessing average resistance to thermal
where:
shock and a moderately good tensile strength (tensile strengths
C = carbon content, %,
above 30 000 psi (207 MPa) may be expected), and
Si = silicon content, %, and
1.2.3 Class III, possessing a higher tensile strength than
P = phosphorus content, %,
either Classes I or II (tensile strengths as high as 40 000 psi
6.2 The carbon content equivalent and the minimum carbon
(276 MPa) may be expected).
content for the various classes shall be as prescribed in Table 1.
1.3 The values stated in inch-pound units are to be regarded
Table 2 prescribes the allowable silicon ranges predicated on
as the standard.
the basis of various permissible carbon contents. It is
2. Referenced Documents recommended that embrittling impurities be held to the
following maximum limits:
2.1 ASTM Standards:
Phosphorus, max, % 0.60
A 48 Specification for Gray Iron Castings
Sulfur, max, % 0.15
3. Manufacture
6.3 The three basic classes may be alloyed with chromium.
3.1 The melting procedure shall be optional with the
When chromium is present as an alloying element, each class
foundry. shall be subdivided into types designated as follows:
Type Chromium, %
4. Physical Requirements
A 0.20–0.40
B 0.41–0.65
4.1 Some of the gray cast irons described in this specifica-
C 0.66–0.95
tion are deliberately made of a soft, low-strength iron for
D 0.96–1.20
resistance to thermal shock, and strength requirements are
6.4 All irons may be alloyed to increase the strength and to
unnecessary. For applications in which a strength requirement
improve and stabilize the structure for elevated-temperature
service. The alloying elements, which, in addition to
chromium, are commonly added to improve these properties,
This specification is under the jurisdiction of ASTM Committee A-4 on Iron
Castings and is the direct responsibility of Subcommittee A04.
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