Delivery Time:10days->
Certification:ISO9001-2008

Stainless Steel U Bend Tube ASME A789, ASME SA213 TP317 / TP317L / TP321 / TP321H
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. All procedure is strictly followed as per TEMA \"C\" and ASTM A-688.

 
U-Bend Tube are widely used in Heat Exchanger Systems. Heat-Exchanger Equipment on the basis of 
Seamless Stainless U-Tubes and Welded Stainless U bend Tube is essential in strategically important and 
critical felds---Nuclear And Petrochemical Machine Building.
YUHONG SPECIAL STEEL Start to Produce U Bending Tube Since 2006, Up to now already supply more than 
30000 tons Stainless Steel U Bend Tube to 35 countries.
 
 
The U-Bend Tube Comply With The Following Standards:
1.    ASTM A688/ASME SA688
2.    ASTM A803/ASME SA803
3.    ASTM A556/ASME SA556
 
Steel Grade:
 

Ferrite	Austenite	Duplex	Super Duplex	Ni-Alloys	Titanium
TP410 TP405 S44400 S44660 TP430	TP304/304L TP316/316L TP316Ti TP317/317L TP321 TP347	S31803 S32205 S32304	S32750 S32760	N06600 N08020 N00880 N08825 N08904	Gr.2

 
 
 
 
 
 
 
 
 
 
Tube Of Other Alloys And Steel Grades Can Be Produced Upon Agreement.
 
 
Technical Requirements:
 
Straight Tubes Standard Specification For Bending:
ASME SA 213; ASME SB 163; ASME A789, ASME SA268, ASME SA269, etc.
Marking: Before Bending By Marking Machine All Over The Tube Length (Bent Section After Heat 
Treatment Without Marking)
Note: Marking is also possible After Bending On The Straight Parts Of U-Bending Tube.
 
U-Bend Tubes:
-TEMA RCB 2.31 Standard Of The Tubular Exchanger Manufacturers Association (9th Edition).
-ASTM A688/ASME SA688 Standard Specification For Welded Tubes Of Austenitic Corrosion Resistant 
Steel Grade Designed For Feed Water Boilers.
-ASTM B163/ASME SA163 Standard Techinical Requirements For Tubes Of Nickel And Nickel Alloy For 
Condensers And Heat Exchangers.
 
-Customer Specifications.

 
Bending Radius: From 1.5*OD(Outside Diameter) To 1500mm
When Ordering Tubes With Radius less or equal to 1.5*OD, It Is Necessary To Agree Precision Of Geometrics.
Straight Tubes Maximum Length:(Before Bending): 35000 mm.
Leg Length: Min 1 Meter, Max. 16500 mm (For Max R=1500mm)
Note: Other Size Are Available Upon Agreement.
Heat Treatment: Stress Relieved After U-Bending (Bending Area Plus 300MM For Each Leg).
Hydrostatic Test After U Bending: Maximum Test Pressure 600 Bar, Soaking 10 Sec. With 
Dematerialized Water. Compressed Air Cleaning After Hydro-Test.
Packaging: In Strong Transport-Worthy Pre-fumigated wooden boxes of corresponding dimensions for 
each tube Length, Radius, Diameter, According To PO requirements as well as wrapped In polyethylene 
films With soft plastic caps on both end of Tube.

Some of the quality tests carried out by us includes:

Corrosion Test	Conducted only when specially requested by the client
Chemical Analysis	Test done as per required quality standards
Destructive / Mechanical Testing	Tensile | Hardness | Flattening | Flare | Flange
Reverse-bend and Re. flat tests	Carried out in full compliance with relevant standards & ASTM A-450 and A-530 norms, which ensures trouble-free