Duplex Steel U Bend Tube ASME SA789 S31500

Duplex Stainless Steel U Bend Tube ASME SA789 UNS S31500 is 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 GROUP deal with  Austenitic Stainless Steel, Nickel Alloy Steel(Hastelloy , Monel, Inconel, Incoloy ) seamless  and welded  pipe and tube already more than 25 years, every year sell more than 80000 tons of steel  pipe and tube. Our client already cover more than 45 countries, Like Italy, UK, Gernmany, USA, Canada, Chile, Colombia, Saudi Arabia, Russia, Korea, Singapore, Austrial, Poland, France , ....And our group branch company and factory have been already approved by :ABS, DNV, GL, BV, PED 97/23/EC, AD2000-WO, GOST9941-81, CCS, TS, CNNC, ISO9001-2008, ISO 14001-2004. 

YUHONG GROUP 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.

USA AMS SA-789/SA-789M SA-789 S31500 Specification for Seamless and Welded Ferritic /Austenitic Stainless Steel Tubing for General Service and Mechanical Properties, 

Chemical Element, Cross Reference, Datasheet.

 

UNS S31500 description: 

UNS S31500 is a kind of seamless duplex stainless steel pipe/tube. S31500 is in the American standard .UNS S31500 seamless alloy steel pipe Process is Cold finished or hot finished.

UNS S31500 Chemical composition as below sheet.

grade	C	Mn	Si	S	P	Cr	Ni	Mo
S31500	0.03	1.30~2.00	0.8	0.030	0.035	18.00~ 19.50	4.50~5.50	2.50~3.0

 
  
UNS S31500 Mechanical properties:

Tensile strength  ≥590 MPa
Yield strength  ≥390 MPa
Elongation A(%)≥20

UNS S31500 application:

UNS S31500 duplex stainless steel has the ferrite to austenite size bipolar organization, good resistance to stress corrosion cracking, pitting corrosion resistance and 00 cr17ni13mo2 quite, has the high strength suitable for the environment of chlorine ion, used in fertilizer, paper making, petroleum, chemical industry and other industrial heat exchanger, condenser, etc.

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 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 20Mpa/7s .
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