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ASME SA688,ASME SA213,ASME SA269,ASME SA789,DIN 28179 Stainless Steel U Tube
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| Model No.︰ | - |
| Brand Name︰ | ASME SA213,ASME SA249,ASME SA269,ASME SA312 |
| Country of Origin︰ | - |
| Unit Price︰ | US $ 9.9 / kg |
| Minimum Order︰ | 200 kg |
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| Specification |
Materials |
| ASTM A213/ASME SA213 Seamless Ferritic and Austenitic Stainless Steel U-bent Tubes |
TP304/304L, TP304H, TP316/316L, TP347/347H, TP316Ti, TP321/321H, TP310S |
| ASTM A249/ASME SA249 Welded Stainless Steel U-bent Tubes |
TP304, TP304L, TP316, TP316L… |
| ASTM A789/ASME SA789 Duplex Stainless Steel U-bent Tubes |
SAF2205/UNS S31803/32205, SAF2507/UNS S32750… |
| ASTM B163/ASME SA163 Seamless Nickel Alloy U-bent Tubes |
Monel400, Inconel600, 625, Incoloy800/800H, 825… |
| ASTM A268/ASME SA269 Ferritic and Martensitic Stainless Steel Seamless U-bent Tubes |
TP405, TP409, TP410, TP430 |
| EN 10217-7 Welded Stainless Steel Tube for Pressure Purpose |
321, 347, 310,UNS-S32760, S31803, S31500 |
| ASTM A688/ASME SA688 Low Pressure Feed Water Heater U Tube of Thermal Power |
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 |
ASTM A688 U Bend Stainless Steel Tube for Heater
ASTM A688 / A688M covers seamless and welded Austenitic stainless steel feedwater heater tubes including stainless steel U bending tube for application in tubular feed-water heaters, surface condition in annealing and pickling, or bright annealing finishing, used in heat exchanger, boiler, condenser, heat transfer system.the tubing sizes covered shall be 5⁄8 in to 1 in. [15.9 to 25.4 mm] inclusive outside diameter, and average or minimum wall thicknesses of 0.028 in. [0.7 mm] and heavier.
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 |
Squareness of Ends Tolerance |
| Leg Length, ft (m) |
Plus Tolerance, in (mm) |
Tube OD, in, (mm) |
Tolerance, in, (mm) |
| <= 20 (6) |
1/8 (3.2) |
<=5.8 (15.9) |
0.010 (0.25) |
| >20(6), <=30(9) |
5/32 (4.0) |
>5.8 (15.9), <=1 (25.4) |
0.016 (0.4) |
| >30 (9), <=40 (12.2) |
3/16 (4.8) |
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ASTM A688 U Bend Stainless Steel Tube specification
- Heat treatment shall be applied to the U-bend area plus approximately 6 in. [150 mm] of each leg beyond the tangent point of the U-bend after bending, if specified.
- Straight length: max 30000 mm
- Leg length: 12000 mm, points of tangency of the bend to the leg end
- Bending radius: max 1500 mm
- Manufacturing method: cold drawing, cold worked
- Straight length equal to 2 x leg length + 3.1416 x R
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 |
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0.08 |
0.035 |
0.035 |
0.08 |
0.035 |
0.035 |
0.060 |
0.08 |
0.08 |
| Mn, max |
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2.00 |
2.00 |
2.00 |
2.00 |
2.00 |
2.00 |
11.50-14.50 |
2.00 |
2.00 |
| Ph, max |
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0.040 |
0.040 |
0.040 |
0.040 |
0.040 |
0.040 |
0.060 |
0.040 |
0.040 |
| S, max |
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0.030 |
0.030 |
0.030 |
0.030 |
0.030 |
0.030 |
0.030 |
0.030 |
0.030 |
| Si,,max |
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0.75 |
0.75 |
0.75 |
0.75 |
0.75 |
0.75 |
1.00 |
0.75 |
0.75 |
| Ni |
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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 |
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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 |
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— |
— |
— |
2.00-3.00 |
2.00-3.00 |
2.00-3.00 |
— |
— |
2.00-3.00 |
| N |
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— |
— |
0.10-0.16 |
— |
— |
0.10-0.16 |
0.20-0.40 |
0.10-0.16 |
0.10-0.16 |
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| Specifications︰ | Technical conditions:
1.Heat treatment: Stress relive annealing of U-tubes after bending
2.Dimensional tolerances U-tubes acc. to TEMA R.C.B.
3.Length of straight part -0/+5 mm
4.Flattening (also called “ovality”) at the bend shall not exceed 10% of the nominal tube outside diameter.
5.Wall thickness in bending part acc. to TEMA RCB 2.31
6.Minimum tube wall thickness in the bend part (T min)
T(min) ≥ (SW × (2×R + D))/( 2× (R+D)
where: SW=smallest wall thickness, D=Nominal outside diameter,R=radius
7.Radius tolerance 1) for R 100 mm +/- 3 mm, 2) for R ≥ 100 mm +/- 5 mm
8.Straightness tolerance max. 1,5 mm per 1 m
9.U-Tube ends: plain, vertically cut to the tube axis
10.Repairs by welding: prohibited
11. Surface condition Finished U-tubes shall be free of scale, without scratches after bending,
12. Delivery Condition: Passivation and oiled, Black paint or varnish, Bright Annealed
13. 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
Main Testing Items and Procedure:
3. Chemical Composition Analysis Test With 100% PMI and One tube from each heat by Direct Reading Spectrometer
4. Visual inspection for waviness and cracks by Dye Penetrant Test. and Endoscope Test for Surface Quality Test:
5. 100% Hydrostatic Test: Minimum:10 Mpa-25Mpa and 100% Eddy Current Test before U bend Formed
6. Ultrasonic Test before U bend Formed subject to the MPS (Material Purchase Specification)
7. Mechanical Tests includes Tension Test, Flattening Test, FlaringTest, Hardness Test
8. Impact Test subject to Standard request
9. Grain Size Test and Intergranular Corrosion Test
10. Ultrasonic measuring of Wall Thickness
11. Stress Relieve Annealing on U bend Parts after bending
12.Air Under Water Test After Bending
13. Cotton Ball Passing Test for ID cleanness
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Product Image
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ASTM A213 TP304/TP304L STAINLESS STEEL U TUBE
cold finished stainless steel U bend tube
ASTM A268 TP405/ASTM A213 TP304/TP304L/TP316L/TP316Ti/TP316H,ASTM B677 904L stainless steel U bend tube
ASME SA213 TP316/TP316L STAINLESS STEEL U TUBE
EN 10216-5/EN ISO 1127 1.4541 COLD DRAWN STAINLESS STEEL U BEND TUBE FOR SUPERHEATERS
ASME SA249/ASME SA688/ASME SA213 TP304/TP304L/TP304H/TP304N stainless steel U bend tube_
ASME SA688 TP321 Seamless and Welded Stainless Steel Low Pressure Feed Water Heater(FWH) U Tubes
Inconel 690 Alloy U Tube
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