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ASTM A403 A403M Standard Specification

What is ASTM A403 A403M Standard?

ASTM A403 A403M is a standard covering the specification of forged austenitic stainless steel pipe fittings for pressure piping applications. This standard includes various grades of stainless steel such as 304, 316 and 317 and covers fittings such as elbowsteesreducerscaps and crosses.
A major advantage of using fittings that conform to ASTM A403 A403M is their high corrosion resistance. Stainless steel is a highly durable material that can withstand harsh environments, making it a popular choice for a wide range of industries, including petrochemical, power generation and water treatment.
The fittings covered by this standard are also known for their excellent mechanical properties, such as high strength and toughness. This makes them suitable for high-pressure applications, such as pipelines and other types of pressure vessels.
Another important aspect of this standard is that it includes specific requirements for the manufacture and testing of fittings. For example, fittings must be manufactured using a specific type of welding process and must undergo rigorous testing and inspection to ensure that they meet the necessary quality standards.
In summary, ASTM A403 A403M is an important standard that sets guidelines for the manufacture of high-quality, corrosion-resistant stainless steel fittings for pressure piping applications. It ensures that these fittings have the mechanical properties required to withstand high pressures and are manufactured and tested to the highest quality standards.
If you are looking for fittings that meet ASTM A403 A403M, work with a reputable supplier who has the experience and expertise to provide you with the quality products you need.

ASTM A403 A403M Standard Specification


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

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.

2.Referenced Documents

2.1 ASTM Standards:3

A351/A351M Specification for Castings, Austenitic, for Pressure-Containing Parts

A743/A743M Specification for Castings, Iron-Chromium, Iron-Chromium-Nickel, Corrosion Resistant, for General Application

A744/A744M Specification for Castings, Iron-Chromium-Nickel, Corrosion Resistant, for Severe Service

A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products

A960/A960M Specification for Common Requirements for Wrought Steel Piping Fittings

E112 Test Methods for Determining Average Grain Size

E165 Practice for Liquid Penetrant Examination for General Industry

2.2 ASME Standards: 4

ASME B16.9 Factory-Made Wrought Steel Butt-Welding Fittings

ASME B16.11 Forged Steel Fittings, Socket-Welding and Threaded

2.3 MSS Standards: 5

MSS SP-25 Standard Marking System for Valves, Fittings, Flanges, and Unions

MSS SP-43 Standard Practice for Light Weight Stainless Steel Butt-Welding Fittings

MSS SP-79 Socket-Welding Reducer Inserts

MSS SP-83 Steel Pipe Unions, Socket-Welding and Threaded

MSS SP-95 Swage(d) Nipples and Bull Plugs

MSS SP-97 Integrally Reinforced Forged Branch Outlet Fittings—Socket Welding, Threaded and Butt-welding Ends

2.4 ASME Boiler and Pressure Vessel Code: 4

Section VIII Division I

Section IX

2.5 AWS Standards: 6

A 5.4 Specification for Corrosion-Resisting Chromium and Chromium-Nickel Steel Covered Welding Electrodes

A 5.9 Specification for Corrosion-Resisting Chromium and Chromium-Nickel Steel Welding Rods and Bare Electrodes

A 5.11 Specification for Nickel and Nickel-Alloy Welding Electrodes for Shielded Metal Arc Welding

A5.14 Specification for Nickel and Nickel-Alloy Bare Welding Rods and Electrodes

2.6 ASNT: 7

SNT-TC-1A (1984) Recommended Practice for Nondestructive Testing Personnel Qualification and Certification.

Research use only,Commercial use is prohibited.

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