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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)