1.4462 Duplex Stainless Steel Pipe , UNS S31803 20FT Double Tube Heat Exchanger
Features:
Higher strength than standard stainless steels
Higher corrosion resistance than 316 stainless steel in a wide variety of corrosive chemicals including sulphuric, phosphoric and nitric acids
Good resistance to pitting and crevice corrosion in seawater
High stress corrosion resistance
Lower thermal expansion than austenitic stainless steels
Higher thermal conductivity than austenitic stainless steels
Corrosion Resistance:
UNS S31803 is resistant to intergranular corrosion. It has better corrosion resistance than that of other austenitic stainless grades such as 316, with higher resistance to stress corrosion cracking to that of either 304 or 316 stainless grades. Pitting corrosion and crevice corrosion is higher than that of 316. Due to its higher corrosion resistance UNS S31803 has better fatigue strength in corrosive environments than that of other austenitic stainless steel specifications.
Spezilla can manufacture heat exchanger tubes to the industry specifications outlined in this chart:
| Specification |
Alloy |
Testing |
| ASTM B622 |
C276 (UNS N10276) |
Seamless Eddy Current tested |
| ASTM B626 |
C276 (UNS N10276) and
C22 (UNS N06022) |
IA Welded and Annealed - 100% Eddy Current tested
IB Welded, Sized and Annealed - 100% Eddy Current tested
IIA Welded and Cold Worked - 100% Eddy Current tested
IIB Welded and Cold Worked - 100% Eddy Current and Hydrostatically tested |
| ASTM A789 |
Duplex (UNS S31803)
Super Duplex (UNS S32760 and UNS 32750) |
Seamless, Welded, Welded redrawn - 100% Eddy Current tested |
| ASTM B516 |
Alloy 600 (UNS N06600) |
Welded and Welded redrawn
Class 1 - 100% Eddy Current tested
Class 2 - 100% Eddy Current and Pressure tested |
ASTM A213
ASTM A269 |
Stainless Steels |
Seamless - 100% Eddy Current tested |
| Applications of UNS S31803 |
| Chemical Process Industry: |
| Sulphuric Acid Production, Nitric Acid Processes, Phosphoric Acid Processes, Ethylene oxide, Polypropylene Production, PVC, Equipment Handling Organic and Fatty Acids, Chemical Storage and Tankers, Heat Exchangers |
| |
| Marine Industry and Shipbuilding: |
| Propellers and Shafts, Rudders, Shaft Seals, Pumps, Bolts and Fasteners, Valves, Instrumentation, Oil and Chemical Tankers |
| |
| Oil and Gas Industry: |
| Pumps, Valves, Pipe, Vessels, Wellhead Equipment, Subsea Equipment, Separators, Heat Exchangers |
| |
| Pollution Control: |
| Waste water treatment, Sour water purification |
| |
| Pulp and Paper Industry: |
| Pulp liquor heaters, Bleach Tower Linings, Digesters, Brownstock Washers |
| |
| Food Industry: |
| Brewery Piping, Evaporators, Hot liquor tanks, Presses |
