309 Stainless Steel Pipe Alloy 309 austenitic stainless steel is typically used for elevated temperature applications. Its high chromium and nickel content provides comparable corrosion resistance, superior resistance to oxidation, and the retention of a larger fraction of room temperature strength than the common austenitic Alloy 304.
Because of its high chromium and low nickel content, Alloy 309 can be utilized in sulfur containing atmospheres up to 1832°F (1000°C). The alloy is not recommended for use in highly carburizing atmospheres since it exhibits only moderate resistance to carbon absorption. Alloy 309 can be utilized in slightly oxidizing, nitriding, cementing and thermal cycling applications, albeit, the maximum service temperature must be reduced.
309 Stainless Steel Seamless Pipes covers Seamless and Welded, Black and Hot-Dipped Galvanized nominal (average) wall pipe for coiling, bending, flanging and other special purposes and is suitable for welding. Continuous-Welded pipe is not intended for flanging. Purpose for which pipe is intended should be stated on order.
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Specification:
Sizes (Seamless): 1/8" NB - 24" NB
Sizes (ERW): 1/2" NB - 24" NB
Sizes (SAW/EFW): 6" NB - 100" NB
Wall Thickness: Schedule 5S - Schedule XXS
Length: Single Random, Double Random, Cut Length
Chemical Composition of 309 Stainless Steel pipe
| Element | Iron, Fe | Chromium, Cr | Nickel, Ni | Manganese, Mn | Silicon, Si | Carbon, C | Phosphorous, P | Sulfur, S |
| Content (%) | 60 | 23 | 14 | 2 | 1 | 0.20 | 0.045 | 0.030 |
Mechanical Properties of 309 Stainless Steel pipe
| Properties | Tensile strength | Yield strength (@ strain 0.200%) | Izod impact | Shear modulus (typical for steel) | Elastic modulus | Poisson's ratio | Elongation at break (in 50 mm) | Hardness, Brinell | Hardness, Rockwell B | Hardness, Vickers (converted from Rockwell B hardness) |
| Metric | 620 MPa | 310 MPa | 120 - 165 J | 77 GPa | 200 GPa | 0.27-0.30 | 45% | 147 | 85 | 169 |
| Imperial | 89900 psi | 45000 psi | 88.5 - 122 ft-lb | 11200 ksi | 29008 ksi | 0.27-0.30 | 45% | 147 | 85 | 169 |
Advantages of 309 Stainless Steel Pipes:
- Good general corrosion resistance and high strength
- Good sulfide stress corrosion resistance
- Resistance to chloride pitting and crevice corrosion
- Higher resistance to chloride stress corrosion cracking
- Easy to weld and conform
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Applications Industry
| Pharmaceutical Equipment | Chemical Equipment |
| Sea Water Equipment | Heat Exchangers |
| Heat Exchangers | Gas Processing |
| Condensers | Specialty Chemicals |
| Pulp and Paper Industry | Pharmaceuticals |
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