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ASTM A688,ASTM A213,ASTM A249,DIN 28179 Stainless Steel U-Tube,U-bent tube

  • ASTM A688,ASTM A213,ASTM A249,DIN 28179 Stainless Steel  U-Tube,U-bent tube
  • ASTM A688,ASTM A213,ASTM A249,DIN 28179 Stainless Steel  U-Tube,U-bent tube
  • ASTM A688,ASTM A213,ASTM A249,DIN 28179 Stainless Steel  U-Tube,U-bent tube
  • ASTM A688,ASTM A213,ASTM A249,DIN 28179 Stainless Steel  U-Tube,U-bent tube
  • ASTM A688,ASTM A213,ASTM A249,DIN 28179 Stainless Steel  U-Tube,U-bent tube
  • ASTM A688,ASTM A213,ASTM A249,DIN 28179 Stainless Steel  U-Tube,U-bent tube
  • ASTM A688,ASTM A213,ASTM A249,DIN 28179 Stainless Steel  U-Tube,U-bent tube
  • ASTM A688,ASTM A213,ASTM A249,DIN 28179 Stainless Steel  U-Tube,U-bent tube
  • ASTM A688,ASTM A213,ASTM A249,DIN 28179 Stainless Steel  U-Tube,U-bent tube
Model No.︰-
Brand Name︰MIL
Country of Origin︰-
Unit Price︰US $ 9.9 / kg
Minimum Order︰200 kg
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Product Description

Products 

 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     12.5m (41')~27m(max.dev.Length 88’) ASTM A213/ASME SA213 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 SAF2205/UNS S31803/32205, SAF2507/UNS S32750… Duplex Stainless Steel U-bent Tubes
ASTM/ASME A/SA163 Monel400, Inconel600, 625, Incoloy800/800H, 825…  Seamless Nickel Alloy U-bent Tubes
ASTM/ASME A/SA268 TP405, TP409, TP410, TP430 Ferritic and Martensitic Stainless Steel Seamless U-bent Tubes
        EN: 10217-7 321, 347, 310,UNS-S32760, S31803, S31500  
 Seamless and Welded Stainless Steel Low Pressure Feed Water Heater(FWH) U-bent Tubes 12.7-25.4             (1/2”-1”) 0.7-3.05mm   (0.028”-0.12”)  Leg Length     12.5m (41’)-27m(max.dev.Length 88’) ASTM/ASME A/SA688/213 304/304L/304H(1.4301/1.4306/1.4948); 316/316L(1.4401/1.4404);316Ti(1.4571); 321(1.4541);309S(1.4833);310S(1.4845); 317L(1.4438);321H(1.4878);347H(1.4550); 2205(1.4462) ; S31803,2507  Low Pressure Feed Water Heater of Thermal Power 


'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 microstructure 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'-Bent Steel Tubes are manufactured in our plant as per the customer requirements. Bends can be Heat Treated in accordance with Clients' requirements followed by hydrostatic testing and dye penetrant testing if required.

U-bent stainless steel tubes are widely used in heat-exchanger systems. Heat-exchanger equipment on the basis of seamless stainless U-tubes is essential in strategically important and critical fields - nuclear and petrochemical machine building.
1. ASTM A688/A688M-08
2. ASTM A803/A803M
3. ASTM A556/A556M, ASME SA-556
4. ASME SA-688

Initial Length
Maximum lengths of 27000mm can be supplied on request
Bending radius: Maximum 1000 mm


The basic Testing and processing:
1. High Pressure Hydrostatic Test:Minimum:10 Mpa-25Mpa.
2. Air Under Water Test After Bending
3. U Tubes Wall Thickness Test
4. Eddy Current Test before U bend Formed
5. Ultrasonic Test before U bend Formed
6. Heat treatment to stress relieved
7. Ball passing test
 

Technical conditions:

Heat treatment:Stress relive annealing of U-tubes after bending

Surface condition Finished U-tubes shall be free of scale, without scratches after bending

Dimensional tolerances U-tubes acc. to TEMA R.C.B.

Length of straight part -0/+5 mm 

Flattening (also called “ovality”) at the bend shall not exceed 10% of the nominal tube outside diameter.

Wall thickness in bending part acc. to TEMA RCB 2.31 

Minimum tube wall thickness in the bend part (T min)

T(min) ≥ (SW × (2×R + D))/( 2× (R+D)

where:   SW  is smallest wall thickness

 D  Nominal outside diameter

 R radius

Radius tolerance 1) for R   100 mm +/- 3 mm

2) for R ≥ 100 mm +/- 5 mm

Straightness tolerance max. 1,5 mm per 1 m

U-Tube ends: plain, vertically cut to the tube axis

Repairs by welding: prohibited

Surface condition Finished U-tubes shall be free of scale, without scratches after bending,  

 

 

Coating :Passivation and oiled, Black paint or varnish

Packing:Plastic plugs in both ends, bundles of max. 3,000kg with several steel strips, Two tags on each bundle, Wrapped in waterproof paper packed in wooden case

Mill Test Certificate:EN 10204/3.1B

Addition:Clean steel grade covered with NACE MR-0175,

USAGE: Heat  Exchanger; Steam Boiler;Hot-Water Boiler; Medium temperature  Boiler serve ; oil and gas transportation,low-temperature serve; Shipbuilding ect.

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