ThePipingMart Blog Grades 348 Stainless Steel (UNS S34800) – Composition, Properties, and Uses

348 Stainless Steel (UNS S34800) – Composition, Properties, and Uses

348 Stainless Steel

UNS S34800 is an alloy of iron, chromium, and nickel. It has a unique combination of properties that make it ideal for many applications in the manufacturing and engineering industries. In this blog post, we’ll take a look at its composition, physical properties, mechanical properties, and uses. Let’s get started!

348 Stainless Steel Composition

UNS S34800 contains 18-20% chromium and 9-13% nickel. It also contains trace amounts of carbon, manganese, phosphorus, sulfur, and silicon. These elements come together to create an alloy that is resistant to corrosion and rust and has excellent heat resistance capabilities. This makes it an ideal material for use in extreme environmental conditions, such as in high-temperature industrial settings or areas with high humidity or moisture levels.

Element Content (%)
Iron, Fe 66
Chromium, Cr 19
Nickel, Ni 11
Manganese, Mn 2.0
Silicon, Si 1.0
Nb + Ta 0.8
Cobalt, Co 0.2
Tantalum, Ta 0.1
Carbon, C 0.080
Phosphorous, P 0.045
Sulfur, S 0.030

348 Stainless Steel Physical Properties

UNS S34800 is a ferritic grade material with a melting point range of 2750°F – 2800°F (1480°C – 1535°C). Its density is 0.288 lbs/in3 (7.8 g/cm3). The tensile strength of this material ranges from 65 ksi (450 MPa) to 95 ksi (650 MPa), depending on the heat treatment used. It has a yield strength between 30 ksi (205 MPa) to 80 ksi (550 MPa). The elongation at break is 25%.

Properties Metric Imperial
Density 8 g/cm3 0.289 lb/in³
Melting point 1427°C 2600°F

348 Stainless Steel Mechanical Properties

UNS S34800 has good formability, which allows it to be easily cold-formed into shapes like rods or sheets. It also has excellent wear resistance, which makes it ideal for components that require frequent cleaning or need to withstand harsh environments such as high temperatures or corrosive chemicals. Additionally, its weldability offers design flexibility for complex parts requiring joining operations.

Properties Metric Imperial
Tensile strength 655 MPa 95000 psi
Yield strength (@ strain 0.200%) 275 MPa 39900 psi
Izod impact 120 – 160 J 88.5 – 118 ft-lb
Charpy impact 160 J 118 ft-lb
Shear modulus (typical for steel) 77.0 GPa 11200 ksi
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
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

348 Stainless Steel Thermal Properties

Properties Metric Imperial
Thermal expansion co-efficient ( @ 0-100°C/32-212°F) 17.3 µm/m°C 9.61 µin/in°F
Thermal conductivity (@ 100°C/212°F) 16.3 W/mK 113 BTU in/hr.ft².°F

348 Stainless Steel Equivalent

ASTM A167 ASTM A312 ASTM A479 QQ S766 ASME SA376
ASTM A249 ASTM A376 ASTM A814 ASME SA249 MIL-S-23196
ASTM A269 ASTM A403 DIN 1.4550 ASME SA312 SAE 30348
ASTM A276 ASTM A409 MIL S-23195 ASME SA358 SAE J405 (30348)

348 Stainless Steel Uses

UNS S34800 can be used in many different applications due to its combination of properties, including corrosion resistance and wear resistance, as well as its formability and weldability. These qualities make it ideal for use in automotive exhaust systems, food processing equipment, medical instruments, oil refineries and chemical plants, among other industrial settings where components are exposed to extreme environmental conditions such as high temperatures or corrosive chemicals.


In conclusion, 348 ss is an alloy composed primarily of iron, chromium and nickel that offers excellent corrosion resistance, wear resistance and formability when used in extreme environmental conditions such as high-temperature industrial settings or areas with high levels of humidity or moisture. Its weldability provides design flexibility while its physical properties offer strength, making it an ideal material for many different applications, including automotive exhaust systems, food processing equipment, medical instruments and oil refineries, among others where components may be exposed to harsh environments like corrosive chemicals or extreme temperatures. When considering what type of metal should be used for your application, consider 348 stainless steel for its combination of qualities that make it perfect for many different scenarios.

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