Introduction
X18CrN28 is a martensitic stainless steel grade containing chromium and nickel additions. The grade offers a high degree of corrosion resistance and mechanical strength, with a minimum yield strength of 540MPa and a minimum ultimate tensile strength of 780MPa. It also boasts a minimum hardness of 85HRC, as certified by Rockwell C. These characteristics makes X18CrN28 a highly versatile grade of stainless steel, with a wide range of applications.
Chemical Composition
X18CrN28 is a martensitic stainless steel and contains the following chemical composition according to the UNS A95136 standard:
• Carbon (C): 0.08-0.12%
• Manganese (Mn): <=1.00%
• Phosphorus (P): <=0.040%
• Sulphur (S): <=0.030%
• Chromium (Cr): 17.00-19.00%
• Nickel (Ni): 2.00-4.00%
• Molybdenum (Mo): <=0.80%
• Silicon (Si): <=0.75%
• Nitrogen (N): 0.10-0.20%
• Copper (Cu): <=0.50%
• Iron (Fe): Balance
Applications
This grade of stainless steel is used in a variety of industries and applications, depending on the strength and corrosion resistance requirements of the project.
Structural Components
X18CrN28 is often used in the fabrication of load-bearing components and structures, such as cranes, bridges, and frames. It has the strength to withstand high loads, while also providing corrosion and oxidation resistance.
Cutlery
X18CrN28 has the hardness and corrosion resistance needed to be used in the fabrication of cutlery, both in commercial and domestic applications. The grade is known for its resistance to tarnish and discolouration, making it a popular choice for cutlery products.
Medical Instruments
The combination of corrosion resistance and hardenability makes X18CrN28 an ideal stainless steel for use in medical instruments and devices. Its high degree of strength allows for delicate instruments to handle heavy use, while its inert nature reduces the risk of infection and other potentially harmful side effects.
Food Processing
This grade of stainless steel is often used in the manufacture of food processing machinery and equipment. The grades corrosion resistance ensures that the machinery remains hygienically clean and food-safe, while its strength and ease of fabrication makes it suitable for a variety of industrial processes.
Heat Exchangers
X18CrN28s strength, thermal stability, and high heat transfer rate makes it an excellent choice of material for use in shell and tube heat exchangers. The grades corrosion resistance also helps to prevent the metallic materials inside the exchanger from corroding and malfunctioning.
Conclusion
X18CrN28 is a martensitic stainless steel which is renowned for its high strength and corrosion resistance. This combination of characteristics makes the grade suitable for a broad range of applications, from structural components to medical instruments and heat exchangers. The grade is widely used across a variety of industries and its versatile nature ensures that it will remain a popular choice of material in the future.
