ASTM A403/A403M-19 - 1.3.2019
 
1. Scope

1.1 This specification covers wrought stainless steel fittings for pressure piping applications.2

1.2 Several grades of austenitic stainless steel alloys are included in this specification Grades are designated with a prefix, WP or CR, based on the applicable ASME or MSS dimensional and rating standards, respectively.

1.3 For each of the WP stainless grades, several classes of fittings are covered, to indicate whether seamless or welded construction was utilized. Class designations are also utilized to indicate the nondestructive test method and extent of nondestructive examination (NDE). Table 1 is a general summary of the fitting classes applicable to all WP grades of stainless steel covered by this specification. There are no classes for the CR grades. Specific requirements are covered elsewhere.

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

1.5 The values stated in either SI units or inch-pound 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.

1.6 This specification does not apply to cast steel fittings. Austenitic stainless steel castings are covered in Specifications A351/A351M, A743/A743M, and A744/A744M.

1.7 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

E165-09

Standard Practice for Liquid Penetrant Examination for General Industry

ASME B16.9

Factory-Made Wrought Steel Butt-Welding Fittings

A960/A960M-23

Standard Specification for Common Requirements for Wrought Steel Piping Fittings

A751-21

Standard Test Methods and Practices for Chemical Analysis of Steel Products

A351/A351M-18e1

Standard Specification for Castings, Austenitic, for Pressure-Containing Parts (Includes all amendments and changes 8/27/2019).

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).

E112-13(2021)

Standard Test Methods for Determining Average Grain Size