| Customization: | Available |
|---|---|
| Type: | Alloy Steel Bar |
| Standard: | AISI, ASTM, DIN, JIS, GB |
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Alloy 309 (UNS S30900) is an austenitic stainless steel developed for use in high temperature corrosion resistance applications. The alloy resists oxidation up to 1900°F (1038°C) under non-cyclic conditions. Frequent thermal cycling reduces oxidation resistance to approximately 1850°F (1010°C).
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.
When heated between 1202 - 1742°F (650 - 950°C) the alloy is subject to sigma phase precipitation. A solution annealing treatment at 2012 - 2102°F (1100 - 1150°C) will restore a degree of toughness.
309S (UNS S30908) is the low carbon version of the alloy. It is utilized for ease of fabrication. 309H (UNS S30909) is a high carbon modification developed for enhanced creep resistance. It most instances the grain size and carbon content of the plate can meet both the 309S and 309H requirements.
Alloy 309 can be easily welded and processed by standard shop fabrication practices.
The following table shows the chemical composition of grade 309S stainless steel.
| Element | Content (%) |
| Iron, Fe | 60 |
| Chromium, Cr | 23 |
| Nickel, Ni | 14 |
| Manganese, Mn | 2 |
| Silicon, Si | 1 |
| Carbon, C | 0.080 |
| Phosphorous, P | 0.045 |
| Sulfur, S | 0.030 |
| Grade | UNS | DIN | EN | AMS | ASTM | JIS | |
| 309S |
S30908 |
1.4833 |
AMS 5523
AMS 5574
AMS 5650
|
ASTM A276
ASTM A312
ASTM A314
ASTM A473
ASTM A479
ASTM A511
|
- | ||
The physical properties of grade 309S stainless steel are given in the following table.
| Properties | Metric | Imperial |
| Density | 8 g/cm3 | 0.289 lb/in³ |
| Melting point | 1454°C | 2650°F |
The mechanical properties of annealed grade 309S stainless steel are displayed in the following table.
| Properties | Metric | Imperial |
| Tensile strength, ultimate | 620 MPa | 89900 psi |
| Tensile strength, yield (0.2%) | 310 MPa | 45000 psi |
| Izod impact | 120 - 165 J | 88.5 - 122 ft-lb |
| Modulus of elasticity | 200 GPa | 29000 ksi |
| Shear modulus | 77 GPa | 11200 ksi |
| Poissons ratio | 0.3 | 0.3 |
| Elongation at break (in 50 mm) | 45% | 45% |
| Hardness, Brinell (converted from Rockwell B hardness) | 147 | 147 |
| Hardness, Knoop (converted from Rockwell B hardness) | 164 | 164 |
| Hardness, Rockwell B | 85 | 85 |
| Hardness, Vickers (converted from Rockwell B hardness) | 169 | 169 |
The following table outlines the thermal properties of grade 309S stainless steel.
| Properties | Metric | Imperial |
| Thermal expansion co-efficient (@ 0-100°C/32-212°F) | 14.9 µm/m°C | 8.28 µin/in°F |
| Thermal conductivity (@0-100°C/32-212°F) | 15.6 W/mK | 108 BTU in/hr.ft².°F |
The following are the major applications of grade 309S stainless steel:
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