Austenitic stainless steel S34771 1Cr19Ni11Nb mechanical properties

S34771 Austenitic Stainless Steel

S34771 (1Cr19Ni11Nb) austenitic stainless steel has a unique combination of properties that make it suitable for a variety of applications in different industries. It has good mechanical properties, excellent corrosion resistance, good weldability and a low coefficient of thermal expansion. The addition of niobium improves its overall strength and toughness. The austenitic structure of this grade increases its ductility and formability characteristics. It also offers excellent durability, making it an ideal choice for components that need to maintain their integrity over a long service life.

Mechanical Properties:

The mechanical properties of S34771 steel are dependent on both its chemical composition and its hot working processes. This grade of steel is delivered in the hot-worked condition and has the following properties:

• Ultimate Tensile Strength (UTS): 590-900 MPa

• Yield Strength (YS): 500-790 MPa

• Elongation at Break (EAB): 25-35%

• Reduction of Area (RA): 50-70%

• Hardness: 180-210 HB (Brinell Hardness)

Chemical Composition:

The chemical composition of S34771 steel is provided in the following table.

element content (max %)

Carbon 0.10

Manganese 2.00

Phosphorus 0.045

Sulfur 0.030

Silicon 1.00

Nickel 11.00-13.00

Chromium 18.00-20.00

Nb 0.30-0.50

Furthemore, it is also important to note that this grade of steel should not be used in a temperature range that exceeds 450°C and should not be exposed to high concentrations of hydrogen chloride, sulfuric acid, or highly caustic and saline environments.

Applications:

S34771 is a versatile stainless steel that has multiple applications. Due to its excellent corrosion resistance, it is suitable for use in both indoor and outdoor environments. It is often used in the following application areas:

• Food processing equipment

• Chemical processing

• Pollution control systems

• Heat exchangers

• Desalination systems

• Heat recovery systems

• Pressure vessels

• Petrochemical plants

• Power generation plants

• Refineries

Additionally, this grade of steel is also used for components of bridges, storage tanks, and condenser tubes for HVAC systems.

Weldability:

S34771 stainless steel has good weldability characteristics and is often used for welding operations in industries such as petrochemical, food processing, and chemical processing. This grade is often welded with consumables such as 308L, 309L, 312L, and 316L. When welding, it is important to use precautionary measures such as preheat and post-weld heat treatment because it is prone to weld cracking during the welding process.

Heat Treatments:

S34771 steel can be heat treated by a variety of methods. It is commonly subjected to an annealing process to increase its strength and hardness. This grade can be also hardened by cold processing operations such as cold rolling, cold bending, and cold drawing. Annealing can also be used to improve its formability.

Conclusion:

S34771 (1Cr19Ni11Nb) austenitic stainless steel is a versatile grade of steel that is suitable for a variety of applications. It has excellent mechanical properties, good weldability, and excellent corrosion resistance. It is often used for components of pressure vessels, storage tanks, and heat exchangers. It is also commonly used for bridges, petrochemical plants, and condenser tubes for HVAC systems. This grade of steel is prone to weld cracking, so it is important to use caution when welding. It can also be subjected to a variety of heat treatments to improve its strength and hardness.

S34771 1Cr19Ni11Nb Duplex stainless steel is a high alloy stainless steel with a duplextype structure, containing both austenite and ferrite, with both having higher strength, intergranular corrosive resistance, excellent stress corrosion cracking resistance, pitting and crevice corrosion resistance, fatigue strength and good weldability.

In comparison with the traditional ferritic and austenitic steel grades, duplex stainless steels have a higher yield strength and lower work hardening rate than austenitic steel grades. The lower carbon content of S34771 1Cr19Ni11Nb reduces the martensite phase and leads to a higher mechanical strength at ambient temperature and a lower thermal expansion coefficient.

At room temperature, the strength of S34771 1Cr19Ni11Nb can reach 650Mpa, and the thermal elongation is 22%. The fracture toughness is higher than that of austenitic steels, so this steel is suitable for applications where severe local stresses exist. The corrosion resistance of S34771 1Cr19Ni11Nb is better than the traditional stainless steel grades, such as either 304 or 316. It has certain resistance to crevice corrosion and stress corrosion cracking. In all chloride media, this kind of steel also has good resistance to pitting and intergranular corrosion.

In conclusion, S34771 1Cr19Ni11Nb duplex stainless steel has excellent mechanical strength, thermal expansion coefficient and corrosion resistance, making it a suitable material for applications where thermocycling loading, high stress and corrosion resistance are needed.