A249/A249M Stainless Welded Tubes | For Boilers & Condensers

A249 A249M Steel Tube

This standard covers welded austenitic stainless steel tubes for high-temperature service in boilers, superheaters, heat exchangers, and condensers. It includes both seamless and welded tubes, with dimensions specified in ASME B36.19M.

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ASTM A249/A249M - Standard Specification for Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes

1. Scope

2. Ordering Information

Buyers must specify:

- Quantity (length/number of tubes)

- Material grade (Table 1)

- Size (outside diameter, nominal wall thickness)

- Length (cut, random, or specific)

- Optional requirements (e.g., hydrostatic testing, non-destructive testing, certification)

- Special packaging (if required)

3. Steel Grades & Chemical Composition

Common grades include:

- TP304/304L, TP316/316L, TP321, TP347, etc.

- Chemical composition limits for carbon, manganese, phosphorus, sulfur, silicon, chromium, nickel, and other alloying elements are specified in Table 1.

4. Mechanical Properties

- Tensile strength, yield strength, elongation requirements are listed in Table 2.

- Hardness tests may be required for certain applications.

5. Manufacture & Process Requirements

- Tubes are made by automatic welding with no filler metal.

- Cold-worked or heat-treated (solution-annealed) conditions are specified.

6. Inspection & Testing Requirements

- Hydrostatic or non-destructive electric testing (NDE) is mandatory.

- Flattening, reverse flattening, flange, or bend tests may be required.

- Intergranular corrosion tests (e.g., ASTM A262) for certain grades.

- Certification of compliance with the standard is required.

7. Certification & Marking

- Tubes must be marked with manufacturer’s name, grade, heat number, size, and standard designation (A249 or A249M for metric).

- Test reports must include chemical and mechanical test results.

8. Keywords

- Austenitic stainless steel

- Welded tubes

- Boiler tubes

- Heat exchanger tubes

- High-temperature service

Latest Version

The most recent version is ASTM A249/A249M-23 (2023).

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