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UNS S44735 Stainless Steel Tube represents the pinnacle of corrosion resistance for demanding industrial environments. This super ferritic stainless steel tube, often referred to by its common name AL 29-4C®, is specifically engineered to handle aggressive chloride-containing media. With a high chromium and molybdenum content, UNS S44735 tubes offer exceptional resistance to stress corrosion cracking, pitting, and crevice corrosion, outperforming standard austenitic grades like 316L. These seamless stainless steel tubes are the preferred choice for heat exchanger tubes in coastal power plants, seawater cooling systems, and chemical processing equipment where reliability and longevity are critical.
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UNS S44735 Super ferritic Stainless Steel Tube
UNS S44735 Stainless Steel Tube represents the pinnacle of corrosion resistance within the ferritic stainless steel family. Also known by its common name 29-4-2 Stainless Steel, this super ferritic grade is specifically engineered to withstand the most aggressive chloride-rich environments, offering performance comparable to titanium in many applications. Our Seamless and Welded UNS S44735 Tubes are manufactured to the highest quality standards, including ASTM A268/A268M, ensuring reliability for critical, high-performance systems.
Specifications & Standards
| Category | Specification |
|---|---|
| UNS | S44735 |
| Common Name | 29-4-2 Stainless Steel |
| Standard Grades | UNS S44735 Tube, 29-4-2 Tube |
| Product Standard | ASTM A268/A268M (Seamless and Welded Ferritic Stainless Steel Tubing for General Service) |
| Alternative Standards | ASTM A789/A789M (for General Service) |
| 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 | 0.020 % |
| Chromium, Cr | 29 % |
| Iron, Fe | 65 % |
| Manganese, Mn | 0.50 % |
| Molybdenum, Mo | 4.0 % |
| Nickel, Ni | 0.30 % |
| Niobium, Nb (Columbium, Cb) | 0.60 % |
| Nitrogen, N | 0.020 % |
| Phosphorous, P | 0.030 % |
| Silicon, Si | 0.35 % |
| Sulfur, S | <= 0.010 % |
Available Sizes & Dimensions
| Type | Outer Diameter (OD) | Wall Thickness (WT) | Length |
|---|---|---|---|
| Seamless Tubes | 1/8" (3.17 mm) to 6" (152.4 mm) | 0.015" (0.38 mm) to 0.300" (7.62 mm) | Custom Cut, up to 30 ft (9.1 m) |
| Welded Tubes | 1/4" (6.35 mm) to 8" (203.2 mm) | 0.020" (0.51 mm) to 0.250" (6.35 mm) | Custom Cut, up to 30 ft (9.1 m) |
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