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ASTM A985 / A985M - 21
Standard Specification for Steel Investment Castings General Requirements, for Pressure-Containing Parts
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Abstract
This specification covers a group of common requirements that are mandatory for steel castings produced by the investment casting process for pressure-containing parts. Master heats shall be made by the electric furnace process with or without separate refining such as argon-oxygen-decarburization (AOD), vacuum-oxygen degassing (VOD), vacuum-induction-melting (VIM). Ferritic and martensitic steel shall be cooled after pouring to provide complete transformation of austenite prior to heat treatment to enhance mechanical properties. Chemical, heat, and product analyses shall be performed and the chemical composition thus determined shall conform to the prescribed values in carbon, manganese, silicon, phosphorus, sulfur, nickel, chromium, molybdenum, vanadium, tungsten, copper, and aluminum. Tensile testing shall be done on the castings and shall meet the required yield and tensile strength, elongation, and reduction of area. Each casting shall also be tested after machining to hydrostatic shell pressure test and shall not show any leaks.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1. Scope
1.1 This specification covers a group of common requirements that are mandatory for steel castings produced by the investment casting process for pressure-containing parts under each of the following ASTM Specifications:
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| Title of Specification | ASTM Designation |
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| Steel Castings, Carbon, Suitable for Fusion Welding, | A216/A216M | |
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| for High-Temperature Service |
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| Steel Castings, Martensitic Stainless and Alloy, for | A217/A217M | |
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| Pressure-Containing Parts, Suitable for High- |
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| Temperature Service |
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| Castings, Austenitic, for Pressure-Containing | A351/A351M | |
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| Parts |
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| Steel Castings, Ferritic and Martensitic, for Pressure- | A352/A352M | |
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| Containing Parts, Suitable for Low-Temperature |
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| Service |
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| Steel Castings, Alloy, Specially Heat-Treated, for | A389/A389M | |
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| Pressure-Containing Parts, Suitable for High- |
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| Temperature Service |
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| Steel Castings Suitable for Pressure Service | A487/A487M | |
| Castings, Iron-Nickel-Chromium and Nickel Alloys, Spe- | A990/A990M | |
| Castings, Austenitic-Ferritic (Duplex) Stainless Steel, for | A995/A995M | |
1.2 This specification also covers a group of supplementary requirements, which may be applied to the above specifications as indicated therein. These requirements are provided for use when additional testing or inspection is desired, and apply only when specified individually by the purchaser in the order.
1.3 When investment casting is ordered, the requirements of this specification shall take precedence over the individual material specification requirements.
1.4 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 nonconformance with the standard.
1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
A216/A216M Specification for Steel Castings, Carbon, Suitable for Fusion Welding, for High-Temperature Service
A217/A217M Specification for Steel Castings, Martensitic Stainless and Alloy, for Pressure-Containing Parts, Suitable for High-Temperature Service
A351/A351M Specification for Castings, Austenitic, for Pressure-Containing Parts
A352/A352M Specification for Steel Castings, Ferritic and Martensitic, for Pressure-Containing Parts, Suitable for Low-Temperature Service
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A380/A380M Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems
A389/A389M Specification for Steel Castings, Alloy, Specially Heat Treated, for Pressure-Containing Parts, Suitable for High-Temperature Service
A487/A487M Specification for Steel Castings Suitable for Pressure Service
A488/A488M Practice for Steel Castings, Welding, Qualifications of Procedures and Personnel
A609/A609M Practice for Castings, Carbon, Low-Alloy, and Martensitic Stainless Steel, Ultrasonic Examination Thereof
A751 Test Methods and Practices for Chemical Analysis of Steel Products
A800/A800M Practice for Estimating Ferrite Content of Stainless Steel Castings Containing Both Ferrite and Austenite
A903/A903M Specification for Steel Castings, Surface Acceptance Standards, Magnetic Particle and Liquid Penetrant Inspection
A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys
A967/A967M Specification for Chemical Passivation Treatments for Stainless Steel Parts
A990/A990M Specification for Castings, Iron-Nickel-Chromium and Nickel Alloys, Specially Controlled for Pressure-Retaining Parts for Corrosive Service
A991/A991M Test Method for Conducting Temperature Uniformity Surveys of Furnaces Used to Heat Treat Steel Products
A995/A995M Specification for Castings, Austenitic-Ferritic (Duplex) Stainless Steel, for Pressure-Containing Parts
A1058 Test Methods for Mechanical Testing of Steel ProductsMetric
A1067/A1067M Specification for Test Coupons for Steel Castings
A1080/A1080M Practice for Hot Isostatic Pressing of Steel, Stainless Steel, and Related Alloy Castings
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E94/E94M Guide for Radiographic Examination Using Industrial Radiographic Film
E125 Reference Photographs for Magnetic Particle Indications on Ferrous Castings
E165/E165M Practice for Liquid Penetrant Testing for General Industry
E186 Reference Radiographs for Heavy-Walled (2 to 412 in. (50.8 to 114 mm)) Steel Castings
E192 Reference Radiographs of Investment Steel Castings for Aerospace Applications
E208 Test Method for Conducting Drop-Weight Test to Determine Nil-Ductility Transition Temperature of Ferritic Steels
E280 Reference Radiographs for Heavy-Walled (412 to 12 in. (114 to 305 mm)) Steel Castings
E340 Practice for Macroetching Metals and Alloys
E353 Test Methods for Chemical Analysis of Stainless, Heat-Resisting, Maraging, and Other Similar Chromium-Nickel-Iron Alloys
E354 Test Methods for Chemical Analysis of High-Temperature, Electrical, Magnetic, and Other Similar Iron, Nickel, and Cobalt Alloys
E446 Reference Radiographs for Steel Castings Up to 2 in. (50.8 mm) in Thickness
E709 Guide for Magnetic Particle Testing
E2660 Digital Reference Images for Investment Steel Castings for Aerospace Applications
ANSI Standard
B16.5 Pipe Flanges and Flanged FittingsICS Code
ICS Number Code 49.025.10 (Steels)
UNSPSC Code
UNSPSC Code 31101903(Steel investment casting)
Referencing This Standard
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DOI: 10.1520/A0985_A0985M-21
Citation Format
ASTM A985 / A985M-21, Standard Specification for Steel Investment Castings General Requirements, for Pressure-Containing Parts, ASTM International, West Conshohocken, PA, 2021, www.astm.org
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