1. Element content of 439 stainless steel
439 stainless steel is a ferritic stainless steel whose chemical composition mainly includes carbon (C), silicon (Si), manganese (Mn), nickel (Ni), chromium (Cr), molybdenum (Mo), nitrogen (N), etc. element. The content of these elements has an important impact on the performance of 439 stainless steel.
Carbon (C): The carbon content in 439 stainless steel is usually less than 0.03%. Carbon can increase the strength of steel, but too much carbon can make the steel brittle and affect its weldability.
Silicon (Si): The silicon content is usually less than 1.0%. Silicon can increase the strength and hardness of steel, but too much silicon can make the steel brittle and affect its weldability.
Manganese (Mn): The manganese content is usually less than 1.0%. Manganese can increase the strength and hardness of steel, while also improving the welding properties of steel.
Nickel (Ni): The nickel content in 439 stainless steel is small, usually below 0.50%. Its main function is to stabilize the austenite structure and improve the corrosion resistance of the steel.
Chromium (Cr): Chromium is an important element in 439 stainless steel, and its content is usually between 17.0-19.0%. Chromium can form a stable oxide film, giving steel good corrosion resistance.
Molybdenum (Mo): The molybdenum content in 439 stainless steel is small, usually below 0.20%. Its main function is to improve the corrosion resistance of steel.
Nitrogen (N): Nitrogen content is usually below 0.03%. Nitrogen is a strengthening element that increases the strength and hardness of steel.
2. Mechanical properties of 439 stainless steel
439 stainless steel is a high-chromium, low-carbon stainless steel alloy with good corrosion resistance and mechanical properties. The following are the general mechanical properties of 439 stainless steel:
1. Strength: 439 stainless steel has high yield strength and tensile strength. Generally speaking, its yield strength is about 310 MPa and its tensile strength is about 450 MPa.
2. Elongation: 439 stainless steel has good elongation, also known as elongation. Generally speaking, its elongation rate is over 20%, which means that it is able to stretch to a certain extent without breaking when force is applied.
3. Hardness: The hardness of 439 stainless steel can usually be evaluated by measuring its Rockwell Hardness. The hardness of 439 stainless steel is generally between 70 and 90 HRB.
4. Impact toughness: 439 stainless steel has good impact toughness at low temperatures, which makes it advantageous in some special applications, such as manufacturing corrosion-resistant pipes and heat exchangers.
3. Application fields of 439 stainless steel
1. Automobile exhaust system: The excellent heat resistance and corrosion resistance of 439 stainless steel make it an ideal material for automobile exhaust systems. It can effectively prevent exhaust system damage caused by high temperature and corrosion.
2. Heat exchanger: The good thermal conductivity and high temperature resistance of 439 stainless steel make it widely used in heat exchangers.
3. Home appliances: For example, the shells and internal structures of household appliances such as refrigerators, washing machines, ovens, etc. can be made of 439 stainless steel.
4. Architectural decoration field: The beauty and corrosion resistance of 439 stainless steel make it widely used in the field of architectural decoration, such as window frames, door frames, handrails, etc.
4. Advantages of 439 stainless steel
1. Excellent corrosion resistance: 439 stainless steel has a high chromium content, which can form a stable oxide film, giving the steel good corrosion resistance. It can maintain its original performance in a variety of environments, such as having good corrosion resistance in acid, alkali, salt and other corrosive environments.
2. Good heat resistance: 439 stainless steel has excellent heat resistance and can maintain stable performance in high temperature environments. This makes it widely used in high-temperature environments such as automobile exhaust systems and heat exchangers.
3. Excellent mechanical properties: 439 stainless steel has good hardness and strength, as well as good toughness, making it widely used in various industrial production and processing.
4. Good welding performance: Due to the high manganese content of 439 stainless steel, it has good welding performance. This makes it more convenient and faster during manufacturing and installation.
5. Environmental protection and economy: 439 stainless steel is an environmentally friendly material, which can well meet the needs of modern society for environmental protection. At the same time, due to its corrosion resistance and heat resistance, it has a long service life, thus saving the cost of materials and maintenance.
