304 / 304L, 316 316L, 321,duplex S31803, 2205,nickel alloy U-bend or U-shape bending boiler exhcanger tubes
Key words:
Stainless steel seamless U tubes
SS seamless U tubes
Stainless steel U tubes
SS U tubes
ASTM A213 Stainless steel seamless steel U tubes
Size: OD:6.35mm- 273mm
WT:
0.7-3.68mm
Length: 16m max
ASTM A213
Surface: Annealing pickling ,Bright annealing
Application: Heat exchanger Feedwater Heater
Testing: Measuring test,100% ECT HT etc.
Relative standard:
ASTM A213 ASTM A249 ASTM A798 ASTM A268 SA 268
ASTM A688 A803
ASTM B163
Production Method: Cold drawing and Cold rolled.
Features :
- 'U' bending is done by cold working process.
- 'U' bending is done to the required radius as per customer drawings.
- The bend portion and six inch leg is stress relieved by resistance heating.
- Inert gas (Argon) is passed through it at the required flow rate to avoid oxidation in ID.
- The radius is checked for its OD and wall thinning with the recommended specification.
- The physical properties and micro-structure is checked at three different position.
- Visual inspection for waviness and cracks is done with Dye Penetrant Test.
- Each tube is then hydro tested at the recommended pressure to check for leakage.
- Cotton ball test is done to check the ID cleanliness of the tube.
- Thereafter pickled, dried, marked and packed.
