SS309S Hex bolt SS309 Stainless Steel Bolts ASTM F2281 UNS S30909
China manufacturer of SS309S Hex bolt SS309 Stainless Steel Bolts ASTM F2281 UNS S30909
SS309 Stainless Steel Bolts are premium-grade fasteners engineered to deliver exceptional performance in demanding environments
SS 309S Hex bolt is is a Bolt with Hex head made of SS309S stainless steel.
SS309 is a high temperature chromium nickel austenitic stainless steel that resists oxidation at temperatures up to 1900˚F in dry air at constant temperature.
309/309s Stainless Steels (UNS designation S30900/S30908) are austenitic, chromium-nickel stainless steels that provide excellent corrosion resistance and heat resistance plus good strength at room and elevated temperatures. Type 309s is the low carbon version of 309 which minimizes carbide precipitation and improves weldability. These alloys are non-magnetic as annealed and become slightly magnetic when cold worked.
AISI 309 Equivalent Material
| Grade | North America | France | Germany | Europe | Japan | Russia | European | Italy | China | Poland | UK | USA | Czechia |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SS 309 | UNS S30900 | AFNOR Z17CNS20-12 | WNR/Din X15CrNiSi20-12 | EN 1.4828 | JIS SUH309 | GOST 20KH20N14S2 | EURONORM X15CrNiSi20-12 | UNI X16CrNi23-14 | GB 1Cr20Ni14Si2 |
SS 309 hex bolt composition (% by Weight):
| Element | SS309 | SS309S |
|---|---|---|
| Carbon (C) | ≤ 0.20 | ≤ 0.08 |
| Chromium (Cr) | 22.0 – 24.0 | 22.0 – 24.0 |
| Nickel (Ni) | 12.0 – 15.0 | 12.0 – 15.0 |
| Manganese (Mn) | ≤ 2.00 | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 | ≤ 0.030 |
| Iron (Fe) | Balance | Balance |
Benefits of SS309 Hex Bolts:
- High-Temperature Strength: Retains mechanical integrity under extreme heat.
- Corrosion Resistance: Performs well in marine, acidic, and alkaline conditions.
- Ease of Use: Hex head design allows for quick and secure installation.
- Low Maintenance: Resists rust and wear, reducing the need for frequent replacements.
Differences Between SS309 and SS309S:
- Carbon Content:
- SS309 has a higher carbon content (up to 0.20%), providing better strength at elevated temperatures.
- SS309S has a lower carbon content (≤ 0.08%), which reduces carbide precipitation during welding, enhancing weldability and corrosion resistance.
- Applications:
- SS309: Suitable for applications requiring higher strength at elevated temperatures.
- SS309S: Preferred for applications involving welding or where resistance to intergranular corrosion is critical.
SS309 and 309S provide excellent general corrosion resistance. They are more resistant to marine atmospheres than Type 304. They exhibit high resistance to sulfite liquors and are useful for handling nitric acid, nitric-sulfuric acid mixtures, and acetic, citric, and lactic acids. These materials are generally considered heat-resisting alloys. Their destructive scaling temperature is about 2000 °F (1093 °C). They exhibit good scaling resistance in both continuous and intermittent service, but the alloys should not be used above 1800 °F (982 °C) for intermittent service.
