Stainless steel is a material that has excellent corrosion resistance, aesthetics, non-fading and easy to clean, and also has a long life. Stainless steel castings are widely used in various industries, such as chemical processing, food processing, petroleum refining, waste heat recovery, etc. Stainless steel has many different grades, according to its chemical composition and structural characteristics, it can be divided into austenitic, ferritic, martensitic, duplex and other types. This article will introduce one of the common grades of stainless steel: SUS304N2, what is its chemical composition, mechanical properties, physical properties and application.
What is the Chemical Composition of SUS304N2?
SUS304N2 is an austenitic stainless steel, which contains higher chromium (Cr) and nickel (Ni) elements, as well as trace additions of molybdenum (Mo) and niobium (Nb). These elements improve the corrosion resistance and intergranular corrosion resistance of stainless steel, making it perform well in environments containing chloride ions. The chemical composition (mass fraction) of SUS304N2 is as follows:
C ≤ 0.08%
Si ≤ 1.0%
Mn ≤ 2.5%
P ≤ 0.045%
S ≤ 0.03%
Cr 18-20%
Ni 7.5-10.5%
Mo ≤ 0.15%
N 0.15-0.3%
The chemical composition of SUS304N2 consists of various elements, including carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), chromium (Cr), nickel (Ni), molybdenum (Mo), and nitrogen (N). The carbon content of SUS304N2 is limited to 0.08%, which ensures its high corrosion resistance and prevents intergranular corrosion. The silicon content is kept below 1.0%, and the manganese content is limited to 2.5%. This ensures that the steel has good weldability, formability, and toughness.
The phosphorus and sulfur content of SUS304N2 are also limited to 0.045% and 0.03%, respectively, to ensure its high corrosion resistance and prevent any adverse effects on its mechanical properties.
The most critical elements in the chemical composition of SUS304N2 are chromium and nickel. Chromium is present in the range of 18.0-20.0%, while nickel is present in the range of 8.0-10.5%. These two elements provide excellent corrosion resistance to SUS304N2, particularly in chloride-containing environments. Chromium forms a passive oxide layer on the surface of the steel, preventing further corrosion, while nickel increases the steel’s ductility and toughness.
In addition to chromium and nickel, SUS304N2 also contains trace amounts of molybdenum and nitrogen. Molybdenum improves the steel’s resistance to pitting and crevice corrosion, while nitrogen improves its strength and resistance to intergranular corrosion.
In conclusion, the chemical composition of SUS304N2 is carefully designed to provide excellent corrosion resistance, strength, and durability, making it a popular choice for various industrial applications. By controlling the content of various elements, it is possible to tailor its properties to specific requirements.
What are the Mechanical Properties of SUS304N2?
SUS304N2 has good mechanical properties and weldability, suitable for high temperature and high pressure applications. The mechanical properties of SUS304N2 are as follows:
Yield strength Rp0.2 (MPa): ≥ 162
Tensile strength Rm (MPa): ≥ 694
Elongation A (%): ≥ 33
Reduction in cross section on fracture Z (%): ≥ 41
Brinell hardness (HBW): ≤ 113
SUS304N2 is a type of austenitic stainless steel, which is widely used in various industrial applications due to its excellent mechanical properties, high temperature resistance, and weldability. The mechanical properties of SUS304N2 are critical in determining its suitability for different applications.
The mechanical properties of SUS304N2 include yield strength, tensile strength, elongation, reduction in cross-section on fracture, and Brinell hardness.
The yield strength (Rp0.2) of SUS304N2 is at least 162 MPa. Yield strength is the stress level at which the material begins to deform permanently. SUS304N2 has a higher yield strength than many other types of austenitic stainless steel, which makes it suitable for applications that require high strength and durability.
The tensile strength (Rm) of SUS304N2 is at least 694 MPa. Tensile strength is the maximum stress level that the material can withstand before breaking. The high tensile strength of SUS304N2 makes it suitable for applications that require high strength and resistance to mechanical stress.
The elongation (A) of SUS304N2 is at least 33%. Elongation is the percentage of deformation that a material can undergo before breaking. The high elongation of SUS304N2 makes it highly ductile and flexible, making it suitable for applications that require good formability and weldability.
The reduction in cross-section on fracture (Z) of SUS304N2 is at least 41%. Reduction in cross-section is the measure of the reduction in the cross-sectional area of a material at the point of fracture. The high reduction in cross-section of SUS304N2 indicates its high resistance to brittle fracture and good toughness.
The Brinell hardness (HBW) of SUS304N2 is not more than 113. Brinell hardness is a measure of the hardness of a material by pressing a hardened steel ball into it. The low Brinell hardness of SUS304N2 indicates its good machinability and flexibility.
In conclusion, the mechanical properties of SUS304N2 are crucial in determining its suitability for various applications. With its high yield and tensile strength, good ductility, toughness, and machinability, SUS304N2 is a highly versatile and widely used stainless steel in various industrial applications.
What are the Physical Properties of SUS304N2?
SUS304N2 has similar physical properties to other austenitic stainless steels, such as thermal expansion coefficient, thermal conductivity, specific heat capacity and electrical resistivity. The physical properties of SUS304N2 are as follows:
Modulus of elasticity (GPa): 200
Mean coefficient of thermal expansion 10^-6/ (°C) between 20 (°C) and 100 (°C): 16.9
Thermal conductivity (W/m·°C) at 100 (°C): 16.3
Specific thermal capacity (J/kg·°C) at 20 (°C): 500
Specific electrical resistivity (Ω mm²/m) at 20 (°C): 0.73
Density (kg/dm³) at 20 (°C): 7.93
Poisson’s coefficient: 0.31
SUS304N2 is an austenitic stainless steel with excellent physical properties that make it suitable for various industrial applications. The physical properties of SUS304N2 include modulus of elasticity, mean coefficient of thermal expansion, thermal conductivity, specific heat capacity, electrical resistivity, density, and Poisson’s coefficient.
The modulus of elasticity of SUS304N2 is 200 GPa, which is the measure of the stiffness or rigidity of the material. It is a crucial property to consider in designing structures and machinery that require strength and durability.
The mean coefficient of thermal expansion of SUS304N2 between 20°C and 100°C is 16.9×10^-6/ (°C). Thermal expansion coefficient is a measure of the change in size of a material with temperature variations. The thermal expansion coefficient of SUS304N2 is relatively low compared to other materials, which makes it suitable for applications that require stability under temperature changes.
The thermal conductivity of SUS304N2 at 100°C is 16.3 W/m·°C. Thermal conductivity is the measure of the material’s ability to conduct heat. SUS304N2 has good thermal conductivity, which makes it suitable for applications that require heat dissipation.
The specific heat capacity of SUS304N2 at 20°C is 500 J/kg·°C. Specific heat capacity is the amount of heat required to raise the temperature of one unit of mass of a material by one degree Celsius. SUS304N2 has a relatively high specific heat capacity, which means it can store more heat than other materials.
The specific electrical resistivity of SUS304N2 at 20°C is 0.73 Ω mm²/m. Electrical resistivity is the measure of the material’s resistance to electrical current flow. SUS304N2 has good electrical conductivity, which makes it suitable for applications that require good electrical conductivity.
The density of SUS304N2 at 20°C is 7.93 kg/dm³. Density is the measure of the mass per unit volume of a material. SUS304N2 has a high density, which makes it suitable for applications that require a high mass to volume ratio.
Finally, the Poisson’s coefficient of SUS304N2 is 0.31. Poisson’s coefficient is the measure of the material’s tendency to deform under stress. SUS304N2 has a relatively low Poisson’s coefficient, indicating that it can withstand stress without significant deformation.
In conclusion, the physical properties of SUS304N2 make it a suitable material for various industrial applications, including construction, machinery, and electrical equipment.
What is the Application of SUS304N2?
SUS304N2 is mainly used for applications that require high corrosion resistance and high strength at high temperatures and pressures, such as:
Chemical processing equipment
Food processing equipment
Petroleum refining equipment
Waste heat recovery equipment
Heat exchangers
Pressure vessels
Conclusion
SUS304N2 is an austenitic stainless steel with higher chromium and nickel content than SUS304, as well as trace additions of molybdenum and niobium. It has better corrosion resistance and intergranular corrosion resistance than SUS304, especially in chloride-containing environments. It also has good mechanical properties and weldability, suitable for high temperature and high pressure applications.
I hope this blog post has helped you understand more about stainless steel SUS304N2. If you have any questions or comments, please feel free to leave them below.
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