U Bend Tubing
Austenitic / Duplex Steel / Nickel Alloy / Cobalt AlloyOur heat exchanger tube with pickling and annealing surface is very popular in boilers and heat exchangers industry , water heater industry , air-conditioning industry etc . This kind of seamless tubes are have a very important position in our all products .
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ASTM A213 / ASTM A269 Small Diameter TP304L Stainless Steel Heat Exchanger Tube For Fluid and Gas
Heat Exchanger Production Process :
1 . We use Cold Drawn techonology to produce U bend tube
2 . U bend tubes produce will accordance to customer's drawings
3 . To avoid oxidation , inert gas (Argon) is passed through tubes ID at the required flow rate
4 . The radius is checked for its OD and wall thinning with the recommended specification
5 . We'll choose three different position or as customer's require to make sure tubes quality . We'll do physical properties and micro-structure test
6 . Visual inspection for waviness and cracks is done with Dye Penetrant Test
7 . Each tube is then hydro tested at the recommended pressure to check for leakage
Chemical Composition :
| Material | ASTM A269 Chemical Composition % Max | ||||||||||
| C | Mn | P | S | Si | Cr | Ni | Mo | N B | Nb | Ti | |
| TP304 | 0.08 | 2 | 0.045 | 0.03 | 1 | 18.0-20.0 | 8.0-11.0 | ^ | ^ | ^. | ^ |
| TP304L | 0.035 | 2 | 0.045 | 0.03 | 1 | 18.0-20.0 | 8.0-12.0 | ^ | ^ | ^ | ^ |
| TP316 | 0.08 | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-14.0 | 2.00-3.00 | ^ | ^ | ^ |
| TP316L | 0.035 D | 2 | 0.045 | 0.03 | 1 | 16.0-18.0 | 10.0-15.0 | 2.00-3.00 | ^ | ^ | ^ |
| TP321 | 0.08 | 2 | 0.045 | 0.03 | 1 | 17.0-19.0 | 9.0-12.0 | ^ | ^ | ^ | 5C -0.70 |
| TP347 | 0.08 | 2 | 0.045 | 0.03 | 1 | 17.0-19.0 | 9.0-12.0 | 10C -1.10 | ^ | ||
| ASTM A213 / A213 M | ||
| Elements | 304L(wt%) | 316L (wt%) |
| (C) Carbon, max | 0.035 | 0.035 |
| (Mn) Manganese, max | 2 | 2 |
| (P) Phosphorus, max | 0.045 | 0.045 |
| (S) Sulfur, max | 0.03 | 0.03 |
| (Si) Silicon, max | 1 | 1 |
| (Ni) Nickel | 8.0 - 12.0 | 10.0 - 14.0 |
| (Cr) Chromium | 18.0 - 20.0 | 16.0 - 18.0 |
| (Mo) Molybdenum | N/A | 2.0 - 3.0 |
| (Fe) Iron | Bal. | Bal. |
| (Cu) Copper | N/A | N/A |
| (N) Nitrogen | N/A | N/A |
Manufacturing Experience
Plant Area
Max Diameter of Welded Pipe
Annealing Furnace Length
Nickel Alloy
NI-MO: N10001,N10665,N10675...
NI-CR-MO: N10276,N06022,N06035,N06455,N06002...
NI-CR-MO-CU: N06030,N06200,N08031,N08825,N08020...
NICR-MO-W: N06230...
NICKEL: N02200,N02201...
NI-CU: N04400,N05500...
NI-CR-FE: N06600,N06601,N06690,N08800,N08810,N08811...
NI-CR-MO-NB: N06625,N07718...
Austenitic
304/L/H/N, 316/L/H/N/Ti, 321/H, 309/H, 310S, 347/H, 317/L, 904L...
Duplex Steel
31803, 32205, 32750, 32760...
Cobalt Alloy
Alloy 188/ UNS R30188, Alloy L-605/ UNS R30605, Alloy S-816, Alloy 6B, UMCo50, FSX-414, MP-159...
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