AISI 317L ss is an alloy of iron, chromium, nickel, and molybdenum. It is an austenitic stainless steel with a higher corrosion resistance than the 304 grade and has a lower carbon content. This makes it ideal for applications in highly corrosive environments. Let’s take a look at its composition, physical properties, mechanical properties, and uses.
317L Stainless Steel Composition
The composition of this Stainless Steel Grade 317L consists of 18-20% chromium and 11-15% nickel. The rest of the composition comprises iron, molybdenum, sulfur, silicon, and nitrogen. This low-carbon alloy also contains traces of phosphorus and manganese.
| Element | Content (%) |
|---|---|
| Iron, Fe | Balance |
| Chromium, Cr | 18-20 |
| Nickel, Ni | 11-15 |
| Molybdenum, Mo | 3-4 |
| Manganese, Mn | 2 |
| Silicon, Si | 1 |
| Phosphorous, P | 0.045 |
| Carbon, C | 0.03 |
| Sulfur, S | 0.03 |
317L Stainless Steel Physical Properties
This ss 317L has a ductile yield strength between 40ksi (275MPa) and 90ksi (620MPa). Its melting point ranges from 2550°F to 2635°F (1399°C to 1454°C). It has a density of 0.29 lb/in³ (8 g/cm³). Additionally, it has an electrical resistivity of 72 μΩ·m at 20°C (68°F).
| Denstiy lbm/in^3 |
Coefficient of Thermal Expansion (min/in)-°F |
Electrical Resistivity mW-in | Thermal Conductivity BTU/hr-ft-°F | Specific Heat BTU/lbm -°F | ||
|---|---|---|---|---|---|---|
| at 68 °F | at 77 – 212°F | at 77 – 932°F | at 77 – 1832°F | at 68 – 1832°F | at 32 – 212°F | |
| 0.29 | 9.2 | 10.1 | 10.8 | 31.1 | 14.6 | 0.11 |
317L Stainless Steel Mechanical Properties
The tensile strength for this grade ranges from 65 ksi to 85 ksi (450 MPa to 590 MPa). Its modulus of elasticity is 28 x 10³ ksi (193 GPa), while its thermal expansion coefficient range is 10-6 – 10-5/K at 32–212 °F (0–100 °C). Its thermal conductivity is 9 W/(m·K) at 212 °F(100 °C).
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 595 MPa | 86300 psi |
| Yield strength | 260 MPa | 37700 psi |
| Modulus of elasticity | 200 GPa | 29000 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break (in 50 mm) | 55% | 55% |
| Hardness, Rockwell B | 85 | 85 |
AISI 316L Equivalent
| AISI 317L | ASTM A167 | ASTM A182 | ASTM A213 | ASTM A240 |
| ASTM A249 | ASTM A312 | ASTM A774 | ASTM A778 | ASTM A813 |
| ASTM A814 | DIN 1.4438 | QQ S763 | ASME SA240 | SAE 30317L |
317L Stainless Steel Thermal Properties
| Temperature Range | |||
|---|---|---|---|
| °F | °C | in/in °F | cm/cm °C |
| 68-212 | 20-100 | 8.9 x 10-6 | 16.2 x 10-6 |
317L Stainless Steel Uses
grade 317l is an austenitic chromium-nickel-molybdenum grade of stainless steel with excellent corrosion resistance and formability. It is well suited for various industrial applications such as chemical, petrochemical, fertilizer, power generation, food processing, water supply systems, and medical instruments. This grade of stainless steel has exceptional resistance to sulfuric acid, making it an ideal choice for harsh environment applications such as the lining of tanks and vessels exposed to this corrosive substance. 317L stainless steel also has very good weldability and is used extensively in large structures and small components where toughness and weldability are important criteria. Due to its exceptional qualities, 317L is frequently specified in aerospace applications requiring metallurgical strength and maximum fatigue life.
Conclusion
In conclusion, 317L stainless steel is one of the more versatile alloys available today due to its unique composition that provides superior corrosion resistance and excellent physical properties such as high ductile yield strength and good tensile strength. It can be used in many different industries such as petrochemical processing, power generation plants and desalination plants due to its ability to withstand harsh environments. Ultimately, this makes it an ideal choice when selecting materials for various projects where you need reliable performance that won’t fail over time. Knowing these facts about 317L stainless steel will help you decide which material is best for your application needs!
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