Standard Historical Last Updated: Nov 12, 2012
ASTM A518/A518M-99(2008)

Standard Specification for Corrosion-Resistant High-Silicon Iron Castings


This specification covers standards for high-silicon iron castings of Grades 1, 2, and 3 intended for severe environment corrosion-resistant services. The alloy shall be produced by any melting and casting process, or combination of processes that will be capable of meeting the specified contents of carbon, manganese, silicon, chromium, molybdenum, and copper. Reference analysis methods are given for each chemical component. Transverse bend test and hydrostatic test shall be performed. Material shall conform to minimum load at center and minimum deflection at center requirements.


1.1 This specification covers high-silicon cast iron castings intended for corrosion-resistant service.

1.2 This specification covers three grades as shown in Table 1. Selection of grade depends on the corrosive service to be experienced by the casting. All three grades are suited for application in severe corrosive environments. However, Grade 2 is particularly suited for application in strong chloride environments, and Grade 3 is recommended for impressed current anodes.

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.

1.4 The following safety hazards caveat pertains only to the test method portion, Section 9, 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.

TABLE 1 Chemical Composition

Composition, Weight %
Grade 1
Grade 2
Grade 3
Carbon 0.651.10 0.751.15 0.701.10
Manganese 1.50, max 1.50, max 1.50, max
Chromium 0.50, max 3.255.00 3.255.00
Molybdenum 0.50, max 0.400.60 0.20, max
Copper 0.50, max 0.50, max 0.50, max
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Book of Standards Volume: 01.02
Developed by Subcommittee: A04.01
Pages: 6
DOI: 10.1520/A0518_A0518M-99R08
ICS Code: 77.140.80