TP304L / S30403 Stainless Steel U Bend Heat Exchanger Tube With
Annealed & Pickled Surface
Our 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 .
ASTM A269 Chemical Composition :
| Elements | 304L(wt%) S30403 | 304(wt%) S30400 | 316L (wt%) S31603 | 316 (wt%) S31600 |
| (C) Carbon, max | 0.035 | 0.08 | 0.035 | 0.08 |
| (Mn) Manganese, max | 2 | 2 | 2 | 2 |
| (P) Phosphorus, max | 0.045 | 0.045 | 0.045 | 0.045 |
| (S) Sulfur, max | 0.03 | 0.03 | 0.03 | 0.03 |
| (Si) Silicon, max | 1 | 1 | 1 | 1 |
| (Ni) Nickel | 8.0 - 12.0 | 8.0 - 11.0 | 10.0 - 14.0 | 10.0 - 14.0 |
| (Cr) Chromium | 18.0 - 20.0 | 18.0 - 20.0 | 16.0 - 18.0 | 16.0 - 18.0 |
| (Mo) Molybdenum | N/A | N/A | 2.0 - 3.0 | 2.0 - 3.0 |
| (Fe) Iron | Bal. | Bal. | Bal. | Bal. |
| (Cu) Copper | N/A | N/A | N/A | N/A |
| (N) Nitrogen | N/A | N/A | N/A | N/A |
Application
a) For fluid & gas transport
b) Structure & machining etc
Advantages
a) Advanced technology of cold draw machine
b) Advanced annealing machine
c) Better mechanical property
d) More precise dimension
e) Perfect inspection method and inspection equipment etc
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
