UNS S44735 Stainless Steel Tube
Standard: ASTM A213, ASTM A268, ASTM A249
Grade: UNS S44735
OD: 8 - 127mm. WT: 0.5 - 20mm L: 5 - 13m
Manufacturing Process: Seamless or Welded
UNS S44735 alloy is a super ferritic stainless steel designed by Allegheny Ludlum for extreme resistance to chloride ion pitting, crevice corrosion, and stress corrosion cracking, as well as general corrosion in oxidizing and moderately reducing environments. The alloy was developed in the early 1980s for welded condenser tubing to be used in seawater and brackish water by the power generation industry. It is this extreme resistance to pitting and crevice corrosion that has led to the installation of over 2000 miles of UNS S44735 tubing in power plant condensers and heat exchangers.
| Physical Properties | Metric |
| Density | 7.67 g/cc |
| Mechanical Properties | Metric |
| Hardness, Rockwell B | 90 |
| Tensile Strength, Ultimate | 655 MPa |
| Tensile Strength, Yield | 520 MPa |
| @Strain 0.200 % |
| Elongation at Break | 22% |
| Component Elements Properties | Metric |
| Carbon, C | 0.02% |
| Chromium, Cr | 29% |
| Iron, Fe | 65% |
| Manganese, Mn | 0.50% |
| Molybdenum, Mo | 4.00% |
| Nickel, Ni | 0.30% |
| Niobium, Nb (Columbium, Cb) | 0.60% |
| Nitrogen, N | 0.02% |
| Phosphorous, P | 0.03% |
| Silicon, Si | 0.35% |
| Sulfur, S | <= 0.010 % |
The super ferritic stainless steel UNS S44735 alloy shows excellent resistance to chloride ion pitting, crevice corrosion and stress corrosion cracking. This resistance makes it an ideal choice for battling the corrosive condensate of partially and fully condensing natural gas and propane burning appliances. Its low alloy content, compared to other high-performance alloys, makes it an economical choice as well.
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