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ASTM A522/A522M-22

Current Revision

Standard Specification for Forged or Rolled 8 and 9% Nickel Alloy Steel Flanges, Fittings, Valves, and Parts for Low-Temperature Service

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1.1 This specification2 covers 8 and 9 % nickel-alloy steel forged or rolled flanges, fittings, valves, and parts intended for use in welded pressure vessels for low-temperature service. The specification is applicable to forgings with maximum section thickness of 3 in. [75 mm] in the double normalized and tempered condition and 5 in. [125 mm] in the quenched and tempered condition. Forgings under this specification are intended for service at operating temperatures not lower than −320 °F [−196 °C] for Type I or −275 °F [−170 °C] for Type II or higher than 250 °F [121 °C].

1.2 Material under this specification is available in two types having different chemical compositions as follows:

Type

Nominal Nickel Content, %

I
II

9
8

1.3 This specification is expressed in both inch-pound units and SI units. However, unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.

1.4 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 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.

1.5 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.


This specification covers the 8 and 9% nickel-alloy steel forged or rolled flanges, fittings, valves, and parts intended for use in welded pressure vessels for low-temperature service. Two types of materials are specified according to the chemical composition: type I and type II. Materials for forgings shall consist of ingots, or either forged or rolled blooms, billets, or bars. Except for all types of flanges, elbows, return bends, tees, and header tees, other parts including NPS 4 may be machined from hot-rolled or forged bar. The steel shall conform to the specified chemical requirements for carbon, manganese, phosphorus, sulfur, silicon, and nickel. The following methods of heat treatment shall be used: quenched and tempered and double normalized and tempered. Two tests shall be done to meet the mechanical requirements of the material: tension test and Charpy impact test.


SDO ASTM: ASTM International
Document Number A522
Publication Date Sept. 1, 2022
Language en - English
Page Count 4
Revision Level 22
Supercedes
Committee A01.22
Publish Date Document Id Type View
Sept. 1, 2022 A0522_A0522M-22 Revision
Sept. 1, 2019 A0522_A0522M-14R19E01 Revision
Oct. 1, 2014 A0522_A0522M-14 Revision
Oct. 1, 2013 A0522_A0522M-13 Revision
May 1, 2011 A0522_A0522M-11 Revision
March 1, 2007 A0522_A0522M-07 Revision
Dec. 1, 2006 A0522_A0522M-06 Revision
Sept. 10, 2001 A0522_A0522M-95BR01 Revision
Sept. 10, 2001 A0522_A0522M-95B Revision
Sept. 10, 2001 A0522_A0522M-01 Revision
Sept. 1, 2019 A0522_A0522M-14R19 Reaffirmation