304 / 304L, 316 316L, 321,duplex S31803, 2205,nickel alloy U-bend or U-shape bending boiler exhcanger tubes

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.
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