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1.1 This practice covers procedures and definitions for estimating ferrite content in certain grades of austenitic iron-chromium-nickel alloy castings that have compositions balanced to create the formation of ferrite as a second phase in amounts controlled to be within specified limits. Methods are described for estimating ferrite content by chemical, magnetic, and metallographic means.
1.2 The grades covered by this practice are: CF-3, CF-3A, CF-8, CF-8A, CF-3M, CF-3MA, CF-8M, CF-8C, CG-8M, and CH-10.
1.3 The values stated in either inch-pound units 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 must be used independently of the other. Combining values from the two systems may result in nonconformance with the practice.
1.4 This standard does not purport to address the safety problems, 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 .
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
A351/A351M Specification for Castings, Austenitic, for Pressure-Containing Parts
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A799/A799M Practice for Steel Castings, Stainless, Instrument Calibration, for Estimating Ferrite Content
A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
E38 Methods for Chemical Analysis of Nickel-Chromium and Nickel-Chromium-Iron Alloys
E353 Test Methods for Chemical Analysis of Stainless, Heat-Resisting, Maraging, and Other Similar Chromium-Nickel-Iron Alloys
E562 Test Method for Determining Volume Fraction by Systematic Manual Point Count
American Welding Society SpecificationAWSA4.2, Procedures for Calibrating Magnetic Instruments to Measure the Delta Ferrite Content of Austenitic Stainless Steel Weld Metal Available from American Welding Society (AWS), 550 NW LeJeune Rd., Miami, FL 33126.
ICS Number Code 77.140.80 (Iron and steel castings)