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Seamelss steel pipe

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U Tube

Pipe Type:U Shape Steel Bending Tube Stainless Steel Tube/Pipe Bending U Tube

Dimensions(mm)O.D.:12.7-76.2mm(1/2"-3")

Wall Thickness:0.5-5.16mm(0.02"-0.203")

Leng Length:15.24m(50')

Total length:32.00m(105')32.00m(105')

Standards:

Stainless Steel U Bend Pipes :
ASME / ASTM A213, ASTM A688 / A688M - 08, ASTM A803 / A803M, ASTM A556 / A556M, ASME SA556, ASME SA688 201, 202, 304, 304H, 304L, 309, 310, 316, 316L, 321, etc.
Carbon Steel U Bend Pipes :
ASTM A671 CC60, CC70, ASTM A671 CB60, CB65, CB70, CC60, CC65, CC70
Alloy Steel U Bend Pipes :
DIN 17175, ASTM A369, ASME SA369, Gr. FP91, Gr. FP92

Materials:T5,T11,T12,T22,T9,T91,TP304/304L,TP304H,TP316/316L,TP347/347H,
TP316Ti,TP321/321H,TP310S;TP304,TP304L,TP316,TP316L;UNS S31803/32205, 
UNS S32750;Monel400,UNS N06600,625,Incoloy800/800H,825...

Introduction

Pipe Type:U Shape Steel Bending Tube Stainless Steel Tube/Pipe Bending U Tube

Products Details

Available U-bent Tubes
Products Dimensions
(mm)
O.D.
W.T. Length Standards Materials Remarks
U-bent Tubes for
 Heat Exchanger
12.7-76.2mm
(1/2"-3")
0.5-5.16mm
(0.02"-0.203")
Leg Length:
15.24m(50')
Total length:
32.00m(105')
ASTM/ASME 
A/SA213
T5,T11,T12,T22,
T9,T91,
TP304/304L,
TP304H,
TP316/316L,
TP347/347H,
TP316Ti,
TP321/321H,
TP310S
Seamless ferritic 
and Austenitic 
Stainless Steel 
U-bent Tubes
ASTM/ASME
 A/SA249
TP304,TP304L,
TP316,TP316L...
Welded Stainless
 Steel U-bent 
Tubes
ASTM/ASME
 A/SA789
UNS S31803/32205, 
UNS S32750...
Duplex Stainless 
Steel U-bent 
Tubes
ASTM/ASME
 A/SA163
Monel400,
UNS N06600,625,
Incoloy800/800H,
825...
Ferritic and 
Martensitic 
Stainless Steel 
Seamless U-bent 
Tubes
Seamless and
 (Welded) Re-drawn Stainless Steel 
Feed Water Heater 
U-bent Tubes
12.7-25.4mm
(1/2"-1")
0.7-3.05mm
(0.028"-0.12")
Leg Length:
15.24m(50')
Total length:
32.00m(105')
ASTM/ASME
A/SA688/213
ASTM/ASME
A/SA803
TP304,TP304L,
TP304LN,
TP316,TP316L.
TP316LN,TP439...
Feed Water 
Heater Tubes for 
Thermal 
Power Station

Specification

Chemical Composition

Elem-Ent Grade TP304 TP304L TP304LN TP316 TP316L TP316LN TP XM-29 TP 304N TP 316N
% UNS S30400 S30403 S30453 S31600 S31603 S31653 S24000 S30451 S31651
C, Max   0.08 0.035 0.035 0.08 0.035 0.035 0.060 0.08 0.08
Mn, Max   2.00 2.00 2.00 2.00 2.00 2.00 11.50-14.50 2.00 2.00
Ph, Max   0.040 0.040 0.040 0.040 0.040 0.040 0.060 0.040 0.040
S, Max   0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030 0.030
Si,,Max   0.75 0.75 0.75 0.75 0.75 0.75 1.00 0.75 0.75
Ni   8.00-11.00 8.00-13.00 8.00-13.00 10.00-14.00 10.00-15.00 10.00-15.00 2.25-3.75 8.00-1.00 10.00-14.00
Cr   18.00-20.00 18.00-20.00 18.00-20.00 16.00-18.00 16.00-18.00 16.00-18.00 17.00-19.00 18.00-20.00 16.00-18.00
Mo   - - - 2.00-3.00 2.00-3.00 2.00-3.00 - - 2.00-3.00
N   - - 0.10-0.16 - - 0.10-0.16 0.20-0.40 0.10-0.16 0.10-0.16

Dimensional Tolerance

ASTM A688 U bend tube tolerance of outside should be accordance with specification A1016/M, bent portion of U tubes for R =2 X D or greater, tolerance shall deviate from the nominal diameter prior to bending by more than 10 %, if less than 2 X D is specified, tolerances could be greater, minimum wall thickness shall not exceed +20 % − 0, average wall thickness are 10 % of the nominal wall thickness, bent area wall tolerance shall not be less than value determined by the equation: 4RT/(4R+D).

Tube Leg Length Tolerance

Leg Length, Ft (M) Plus Tolerance, In (Mm)
<= 20 (6) 1/8  (3.2)
>20(6), <=30(9) 5/32  (4.0)
>30 (9), <=40 (12.2) 3/16  (4.8)

Squareness Of Ends Tolerance

Tube OD, In, (Mm) Tolerance, In, (Mm)
<=5.8 (15.9) 0.010 (0.25)
>5.8 (15.9), <=1 (25.4) 0.016 (0.4)

Compared to ASTM A249/A268 specification, ASTM A688 requires more and specific tests to ensure high quality tube, and more tighter tolerances.

Testing & Inspection

  • Tensile Strength
  • Reverse bending test
  • Flattening test
  • Flare test
  • Flange test
  • Dimensional
  • Hydrostatic Test
  • Pneumatic Test
  • Hardness
  • Eddy Current test
  • Intergranular Corrosion (option)

Production process

Our Factory

Packaging

If you have any inquiries and questions, please contact CONTINENTAL STEEL CO.,LTD. at any time. Thanks in advance. Welcome!

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