ThePipingMart Blog Grades 317L Stainless Steel (UNS S31703) – Composition, Properties, and Uses

317L Stainless Steel (UNS S31703) – Composition, Properties, and Uses

317L Stainless Steel

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).

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

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.


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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