ASTM A249 Welded Austenitic 1/4 Stainless Steel Tube for Boilers / Heat Exchanger

ASTM A249  Standard Specification for Welded Austenitc Steel Boiler, Superheater, Heat Exhchanger, Condensor Tubes

Size:  

OD:  1/8 in (3.2mm) to 5 in (127mm)

WT:   0.015 to 0.320 in  (0.4 to 8.1mm)

Grade:

TP304H, TP309H, TP310H, TP316H, TP312H, TP347H and TP348H.

TP304, TP309S, TP310S, TP310Cb, TP316, TP321, TP347, TP348

For high-temperature service such as for superheaters and reheters

Application:

Boiler, Superheater, Heat Exhchanger, Condensor Tubes

Austenitic stainless steel, temperature service applications, high temperature applications

Manufacture:

The tubes are made from flat-rolled steel by an automatic welding process with no addition of filler metel.

Subsequent to welding and prior to final heat treatment, the tubes are cold worked on weld and base metal or in weld metal

Test and inspection:

Tension test

Flattening test

Flange test

Reverse-Bend test

Hardness test

Hydrostatic or Nondestructive Electric Test

Grain size

304 Stainless Features:

Good genneral corrosion resistance.

Ease of cleaning

Excellent strength and toughness at cryogenic temperatures

Good formability 

Good weldabilit

SUPPLEMENTARY REQUIREMENTS

S1 - Stress-Relieved Annealed Tubes

S2 - Minimum Wall Tubes

S3- Air Underwater Pressure Test

S4 - Stabilizing Heat Treatment

S5 - Unstraightened Tubes

S6 - Intergrandular Corrosion Test

S7 - Weld Decay Test

S8 - Special Applications

S9 - Additional Tesing of Welding Tubeing per ASME Request

Referenced Documents:

ASTM Standards:

ASTM A262     Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels

ASTM A480/ A480M   Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip

ASTM A1016/ A1016M  Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes

E 112    Test Methods for Determining Average Grain Size

E213     Practice for Ulstrasonic Examincation of Metal Pipe and Tubing

E273     Practice for Ultrasonic Examination of Weld Zone of Welded Pipe and Tubing

E527     Practice for Numbering Metals and Alloys (UNS)