Stainless Steel U Bend Tube, Eddy Current Test, Hydrostatic Test ,
Ultrasonic Test , Air Pressure Test , A213/SA213 , ASTM A249, ASTM A789, ASTM B163 , ASTM B444 ..
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
Tube Of Other Alloys And Steel Grades Can Be Produced Upon
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
-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.
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
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.
- 'U' bending is done by cold working process.
- 'U' bending is done to the required radius as per customer
- The bend portion and six inch leg is stress relieved by resistance
- 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
- The physical properties and micro-structure is checked at three
- Visual inspection for waviness and cracks is done with Dye
- Each tube is then hydro tested at the recommended pressure to check
- 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.
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 expansion,
welding & use at customers end|
|Eddy Current Testing||Done to detect homogeneities in subsurface by using Digital
Flaw-mark Testing System|
|Hydrostatic Testing||100% Hydrostatic Testing carried out according to ASTM-A 450 norms
for checking tube leakage, and biggest pressure we can support
|Air Under Pressure Test||To check any evidence of air leakage|
|Visual Inspection||After passivation, every single length of tubes & pipes is
subjected to thorough visual inspection by trained staff for
detecting surface flaws & other imperfections|
Supplementary Testing : Apart from the above mentioned tests, we also carry out on the
manufactured products supplementary testing. The tests conducted
under this include:
- Eddy Current Testing
- O.P Testing
- Radiography Testing
- Corrosion Testing
- Micro Testing
- Macro Testing
- IGC Testing
- Ultrasonic testing
- Liquid Penetrate testing