Stainless steel is a kind of steel that contains a minimum of 10% chromium, which gives it enhanced resistance to corrosion, rust and stains. There are many types and grades of stainless steel, depending on their chemical composition and microstructure. One of the common types of stainless steel is austenitic stainless steel, which has a face-centered cubic (FCC) crystal structure and contains nickel and manganese as additional alloying elements. Austenitic stainless steel has good formability, weldability and corrosion resistance in various environments.

SUS304N1 is a kind of austenitic stainless steel according to the Japanese standard JIS G4303:2012. It is a variation of SUS304, which is the most widely used stainless steel grade in the world. SUS304N1 has a lower carbon content than SUS304, which reduces the risk of carbide precipitation during welding and improves the weldability. It also has a higher nitrogen content than SUS304, which increases the strength and hardness of the steel without reducing the ductility. SUS304N1 has good corrosion resistance in oxidizing media, such as nitric acid, acetic acid and sulfuric acid. It also has good resistance to pitting corrosion, crevice corrosion and stress corrosion cracking in chloride environments.

SUS304N1 is equivalent to some other international standards, such as:

American standard ASTM A959-2004: 304N

Chinese standard GB/T 1220-2007: 06Cr19Ni10N

German standard DIN: X5CrNiN18-9

European standard EN: X5CrNiN18-9

British standard BS: 304S65

SUS304N1 is suitable for various applications that require high strength, good corrosion resistance and good weldability, such as:

Food processing equipment

Chemical equipment

Pressure vessels

Heat exchangers

Piping systems

Structural components

What is the Chemical Composition of SUS304N1?

The chemical composition of SUS304N1 is shown in the following table1:

ElementWeight %
Carbon ©≤0.08
Silicon (Si)≤1.00
Manganese (Mn)≤2.50
Phosphorus (P)≤0.045
Sulfur (S)≤0.030
Chromium (Cr)18.00-20.00
Nickel (Ni)7.00-10.50
Nitrogen (N)0.10-0.25

The main difference between SUS304N1 and SUS304 is the lower carbon content and higher nitrogen content of SUS304N1, which affect the mechanical properties and corrosion resistance of the steel.

What are the Mechanical Properties of SUS304N1?

The mechanical properties of SUS304N1 are shown in the following table2:

PropertyValue
Specific heat capacity (J/kg·K)500
Thermal conductivity (W/m·K)16.3
Electrical resistivity (μΩ·m)0.73
Modulus of elasticity (GPa)193
Coefficient of thermal expansion (10^-6/K)17.2

The mechanical properties of SUS304N1 are influenced by the heat treatment and cold working conditions. Generally speaking, SUS304N1 has higher strength and hardness than SUS304 due to the addition of nitrogen, but lower elongation and toughness.

What is the Application of SUS304N1?

SUS304N1 is a kind of austenitic stainless steel that has high strength, good corrosion resistance and good weldability. It can be used for various applications that require these properties, such as:

Food processing equipment: SUS304N1 can resist the corrosion of food acids, salts and other substances, and can be easily cleaned and sterilized. It can be used to make tanks, containers, pipes, valves, pumps and other equipment for food processing and storage.

Chemical equipment: SUS304N1 can resist the corrosion of various chemicals, such as nitric acid, acetic acid and sulfuric acid. It can be used to make reactors, heat exchangers, distillation columns, separators and other equipment for chemical production and processing.

Pressure vessels: SUS304N1 has high strength and good toughness, which can withstand high pressure and temperature. It can be used to make pressure vessels for boilers, steam generators, nuclear reactors and other applications.

Heat exchangers: SUS304N1 has good heat resistance and thermal conductivity, which can transfer heat efficiently and prevent scaling. It can be used to make heat exchangers for power plants, refineries, petrochemical plants and other applications.

Piping systems: SUS304N1 has good weldability and corrosion resistance, which can ensure the integrity and safety of the piping systems. It can be used to make pipes for water supply, gas supply, oil transportation and other applications.

Structural components: SUS304N1 has high strength and good formability, which can be shaped into various structural components. It can be used to make bridges, buildings, vehicles, ships and other applications.

Conclusion

In this blog, we have introduced what is stainless steel SUS304N1, its chemical composition, mechanical properties, physical properties and application. We have learned that SUS304N1 is a variation of SUS304 with lower carbon content and higher nitrogen content, which improves its strength, hardness and corrosion resistance. SUS304N1 is suitable for various applications that require high strength, good corrosion resistance and good weldability, such as food processing equipment, chemical equipment, pressure vessels, heat exchangers, piping systems and structural components. We hope this blog can help you understand what is stainless steel SUS304N1 and how to use it properly.