ASTM A990/A990M-20

ASTM A990/A990M-20 - 1.11.2020

1. Scope

1.1 This specification covers iron-nickel-chromium and nickel alloy castings specially processed with restricted melt practices, weldability testing, and nondestructive examination (NDE) requirements.

1.2 A number of grades of iron-nickel-chromium and nickel alloy castings are included in this specification. Since these grades possess varying degrees of suitability for service in corrosive environments, it is the responsibility of the purchaser to determine which grade shall be furnished. Selection will depend on design and service conditions, mechanical properties, and corrosion-resistant characteristics.

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 nonconformance with the standard.

1.3.1 This specification is expressed in both inch-pound units and in SI units; however, unless the purchase order or contract specifies the applicable M-specification designation (SI units), the inch-pound units shall apply. Within the text, the SI units are shown in brackets.

1.4 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.

1.5 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

A494/A494M-22	Standard Specification for Castings, Nickel and Nickel Alloy
A703/A703M-20a	Standard Specification for Steel Castings, General Requirements, for Pressure-Containing Parts (Includes all amendments and changes 11/16/2020).
A743/A743M-21	Standard Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application
A744/A744M-21a	Standard Specification for Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service (Includes all amendments and changes 11/10/2021).
A802-A802M-95(2001)	Standard Practice for Steel Castings, Surface Acceptance Standards, Visual Examination
AWS A5.4,	Specification for Stainless Steel Electrodes for Shielded Metal Arc Welding
A985/A985M-21	Standard Specification for Steel Investment Castings General Requirements, for Pressure-Containing Parts
E94-04	Standard Guide for Radiographic Examination
E165-09	Standard Practice for Liquid Penetrant Examination for General Industry
E186-20	Standard Reference Radiographs for Heavy-Walled (2 to 412 in. (50.8 to 114 mm)) Steel Castings
E272-21	Standard Reference Radiographs for High-Strength Copper-Base and Nickel-Copper Alloy Castings
E280-21	Standard Reference Radiographs for Heavy-Walled (412 to 12 in. (114 to 305 mm)) Steel Castings
E446-20	Standard Reference Radiographs for Steel Castings Up to 2 in. (50.8 mm) in Thickness
A351/A351M-18e1	Standard Specification for Castings, Austenitic, for Pressure-Containing Parts (Includes all amendments and changes 8/27/2019).
A903/A903M-99(2024)	Standard Specification for Steel Castings, Surface Acceptance Standards, Magnetic Particle and Liquid Penetrant Inspection
AWS A5.9,	Specification for Bare Stainless Steel Welding Electrodes and Rods
AWS A5.11/A5.11M,	Specification for Nickel and Nickel Alloy Welding Electrodes for Shielded Metal Arc Welding
AWS A5.14/A5.14M,	Specification for Nickel and Nickel-Alloy Bare Welding Electrodes and Rods
ASME/ANSI B16.34,	Valves-Flanged, Threaded, and Welding End
A488/A488M-18e2	Standard Practice for Steel Castings, Welding, Qualifications of Procedures and Personnel (Includes all amendments and changes 2/12/2020).