ASTM A126-04

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Designation: A126 – 04
Standard Specification for
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Gray Iron Castings for Valves, Flanges, and Pipe Fittings
This standard is issued under the fixed designation A126; 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.
This standard has been approved for use by agencies of the Department of Defense.
TABLE 1 Tensile Requirements
1. Scope
1.1 This specification covers three classes of gray iron for
Class A Class B Class C
castings intended for use as valve pressure retaining parts, pipe
Tensile strength, min, ksi 21 (145) 31 (214) 41 (283)
fittings, and flanges.
(MPa)
1.2 The values stated in inch-pound units are to be regarded
as the standard. The values given in parentheses are for
information only.
5.1.4 Certification, if required (see Section 17).
NOTE 1—The text of this standard references notes and footnotes which
provide explanatory material. These notes and footnotes (excluding those
6. Workmanship, Finish, and Appearance
in tables and figures) shall not be considered as requirements of the
6.1 The castings shall be made in a workmanlike manner
standard.
and the surface shall be free of adhering sand, scale, cracks,
2. Referenced Documents
and hot tears as determined by visual examination.
2
2.1 ASTM Standards:
7. Chemical Requirements
A48/A48M Specification for Gray Iron Castings
7.1 A chemical analysis shall be performed on each lot and
A644 Terminology Relating to Iron Castings
E8 Test Methods for Tension Testing of Metallic Materials shall conform to the following requirements for phosphorus
and sulfur:
3. Terminology
Phosphorus, max, % 0.75
Sulfur, max, % 0.15
3.1 Definitions of many terms common to gray iron castings
are found in Terminology A644.
7.2 The chemical analysis shall be performed on a sample
obtained during the pouring of the lot.
4. Classification
4.1 Castings produced to this specification are classified 8. Tensile Properties
based upon the minimum tensile strength of the iron (seeTable
8.1 Onetensiontestshallbeperformedoneachlotandshall
1).
conform to the mechanical properties specified in
Table 1.
5. Ordering Information
5.1 Orders for material in this specification should include 9. Cast Test Bars
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the following information:
9.1 Separately cast 1 ⁄8 in. (28.6 mm) diameter test bars
5.1.1 ASTM designation and year date,
shown in Fig. 1 shall be poured in sand molds from the same
5.1.2 Class of iron required,
lot as the castings represented.
5.1.3 Quantity, and
NOTE 2—ThenumberingonthetestspecimensshowninFig.1andFig.
2 is intended simply to illustrate a method of designation. In the particular
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method shown refers to December 8, B1 is the cupola number, and the
1 numeral 1 which follows shows the hour cast (1 p.m.).
This specification is under the jurisdiction of ASTM Committee A04 on Iron
CastingsandisthedirectresponsibilityofSubcommitteeA04.01onGrayandWhite
9.2 Test bars that are intended to represent castings which
Iron Castings.
are cooled in the mold to less than 900°F (480°C) before
Current edition approved May 1, 2004. Published May 2004. Originally
shakeout, shall be cooled in their molds to a temperature less
approved in 1929. Last previous edition approved in 2001 as A126 – 95 (2001).
DOI: 10.1520/A0126-04.
than 900°F, and then may be cooled in still air to room
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
temperature.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
9.3 Test bars that are intended to represent castings which
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. are hotter than 900°F when shaken out of their molds, shall be
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A126 – 04
Metric Equivalents
in. 18141234781181.2 19 32 1 1213423413
/ / / / / / / / / /
mm 3.2 6.4 12.7 19.0 22.2 28.6 30.5 32.5 38.1 44.4 69.8 1330
NOTE—These dimensions are suggested as satisfactory for average conditions, but may be varied to best suit individual pouring.
FIG. 1 Mold of Tension and Transverse Test Specimens
Metric Equivalents
in. mm in. mm
11 8 28.6 3 3 4 95.2
/ /
13 4 44.4 5 5 8 142.9
/ /
17 8 47.6 7 1 2 290.5
/ /
NOTE—Modification may be made to the grip-ends of the tension test specimen to allow alternative means of gripping as required by testing procedures
and equipment. Should alternative grip-ends be disputed, the threaded grip-ends shall be used.
FIG. 2 Tension Test Specimen
cooled as described in 9.2 or (by agreement between the 10.2 After
...