U BEND TUBES 347

u bend b

U BEND TUBES 347 manufacturer, Suppliers And Exporter of Quality U Bend 347 Tubes.

ASME SA269, ASME SA213 A1016- TP347 / TP347H Stainless Steel U Bend Tube for Heat Exchanger

TP347H is an austenitic, niobium-settled stainless chromium-nickel steel for utilization at temperatures up to 850° C (1560° F).

Erosion Resistance

TP347H has with a few impediments (nitric corrosive) the same resistance as the un-stabilized steel TP304, i.e. the material has great resistance in:


Natural acids at moderate temperatures, Salt arrangements, Sulfates, sulfides and sulphites, Acidic situations at moderate temperatures


TP347H is by and large utilized at temperatures over 500 ° C (930 ° F), notwithstanding, where wet erosion is not pertinent.


The adjustment with niobium gives TP347H great imperviousness to inter-granular consumption.


The steel may be delicate to setting and cleft erosion even in arrangements of moderately low chloride content.


Technical Specifications

U-Bend tubes are produced by specialized details asked for by clients:

Standards ASTM, DIN, En
Cross-Section Shape: Round Connection
Type Seamless
Material Stainless Steel
ASTM A213, A312
ASME SA213, SA312
Outside diameter of the tube 6.0-406 mm (1/4'' 16'')
Maximum overall length > 26 m.
Wall Thickness 0.5-35 mm (0.0196'' 1.378'')
Bending radius (min.) 1, 5 × tube diameter.
Bending radius (max.) 1200 mm.
Length Max. 33000 mm
The U-Bend Tube Comply With The Following Standards :

1. ASTM A688/ASME SA688

2. ASTM A803/ASME SA803

3. ASTM A556/ASME SA556

U - Bend Tubes:

• TEMA RCB 2.31 Standard Of the Tubular Exchanger Exporter 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 Technical Requirements for Tubes of Nickel and Nickel Alloy For Condensers and Heat Exchangers.

Product Details :

Name Welded Stainless Steel U - Bend Tube
Standard ASTM, GB, JIS, DIN, EN, AISI
Material Grade TP304/TP304L /TP316/ TP316L /TP316Ti /TP347/ TP347H / TP321/ TP321H/TP310S/TP310H/TP904L
2132 /2507/2520/2205
S31803, S32205 S32750 S32760 S32304 S32101
Outer Diameter 1.5*OD 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)
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.
Thickness Seamless Pipe: 1mm - 8mm; SCH 5/5S/10S/40s
Tolerance According to the Standard.
Manufacturing Process Cold Drawn, Bright Annealed, Pickling
Test UT, ET, HT, RT, Etc. and others according to the standard, or as the requests of the customers
Certificate ISO 9001, etc.


Applications :

Condensers, evaporators, sea water processing, food processing and refrigeration industries, chemical and petrochemical industries, cooling tubes in ammonia converters, good resistance to hydrogen sulphide and inter-granular corrosion, furnace tubes in refineries

Chemical Composition:-

Grade C Mn Si P S Cr Mo Ni N Co + Ta
347 0.08 max 2 max 0.75 max 0.045 max 0.03 max 17 – 19 3 – 4 9 – 13 - 10xC min 
1.00 max