Two popular options for fastening products like screws and bolts are 18-8 stainless steel and A2-70. Both materials are corrosion-resistant, making them ideal for outdoor and marine environments. However, they differ in their composition and strength.
This blog post’ll explore the differences between 18-8 stainless steel and A2-70, including their composition, mechanical properties, and common applications. Whether you are a professional engineer or a DIY enthusiast, this guide will help you choose the right material for your next project.
What is 18-8 Stainless Steel?
18-8 stainless steel is a versatile, strong metal alloy of 18% chromium and 8% nickel. It provides excellent corrosion resistance, making it suitable for many different applications in the food processing industry. Additionally, it is easy to clean and maintain due to its naturally non-porous surface.
What is A2-70?
A2-70 is a grade of stainless steel, denoting its mechanical properties: specifically, it has an ultimate tensile strength of 700MPa (101,500 psi). It is typically used in the aerospace and automotive industries due to its superior corrosion and wear resistance. Additionally, A2-70 provides excellent heat treatability for improved strength and fatigue life.
Difference Between 18-8 Stainless Steel and A2-70
Composition
18-8 stainless steel, or 304 stainless steel, contains 18% chromium and 8% nickel. This composition gives it excellent corrosion resistance and makes it suitable for various applications, including kitchen equipment, medical devices, and architecture.
A2-70 stainless steel, on the other hand, is a more specific grade of stainless steel. It contains 17-19% chromium, 8-10% nickel, and 2% manganese. It also has a carbon content of 0.12-0.20%, which makes it slightly stronger than 18-8 stainless steel.
Mechanical Properties
Regarding mechanical properties, A2-70 stainless steel is stronger and more durable than 18-8 stainless steel. It has a tensile strength of 700 N/mm² and a hardness of 70 on the Rockwell scale. This makes it ideal for high-strength and durability applications, such as the automotive and aerospace industries.
On the other hand, 18-8 stainless steel has a tensile strength of 620 N/mm² and a hardness of 80 on the Rockwell scale. While it’s not as strong as A2-70, it’s still a highly corrosion-resistant material suitable for many applications, especially those in the food and beverage industry.
Common Applications
18-8 stainless steel and A2-70 are widely used in various industries. Some common applications of 18-8 stainless steel include:
- Cutlery and kitchen equipment
- Medical equipment
- Architectural elements
- Outdoor furniture and fixtures
Marine Hardware
Meanwhile, A2-70 stainless steel is often used for:
Automotive parts
- Aerospace components
- High-performance machinery
- Fasteners and bolts
- Heavy-duty machinery
Conclusion
In conclusion, the main differences between 18-8 stainless steel and A2-70 are their composition and mechanical properties. While 18-8 stainless steel is a highly corrosion-resistant material suitable for many applications, A2-70 stainless steel is stronger and more durable, making it ideal for high-performance machinery and aerospace components. When choosing between these two materials, you should consider the specific requirements of your project. If you need high strength and durability, A2-70 stainless steel is the way to go. But if corrosion resistance is your top priority, 18-8 stainless steel is a great option. Both materials are excellent choices for fastening products and will serve you well for years.
A passionate metal industry expert and blogger. With over 5 years of experience in the field, Palak brings a wealth of knowledge and insight to her writing. Whether discussing the latest trends in the metal industry or sharing tips, she is dedicated to helping others succeed in the metal industry.
