Differences in 5 Types of Stainless Steel Often Used in Industry

5 types of stainless steel - austenitic

Austenitic is one of the most widely used types of stainless steel, with outstanding corrosion resistance and non-magnetic properties. This type of stainless steel has a unique crystal structure that makes it easy to form and weld, making it an ideal choice for a variety of applications.

The main content of austenitic is 16% chromium, 7% nickel, and nitrogen. This combination of elements results in a steel that is resistant to corrosion, strong, and durable. In addition, austenitic also has good resistance to extreme temperatures, making it a great choice for applications in various environments.

Austenitic is divided into two main categories, the 300 and 200 series. The 300 series, such as 304 and 316, are the most commonly used and offer superior corrosion resistance. The 200 series, such as 201 and 202, have a lower nickel content, making them less expensive, but lower in corrosion resistance.

1. Advantages of Austenitic

• Easy to mold and weld
• Strong and durable
• Resistant to corrosion
• Resistant to extreme temperatures
• Non-magnetic

2. Disadvantages of Austenitic

• Low thermal conductivity
• More expensive than other types of stainless steel

3. Austenitic Applications

• Kitchenware
• Medical equipment
• Food and beverage industry
• Automotive
• Construction
• Chemical industry
• Petrochemicals
• Sea water treatment

Ferritic

5 types of stainless steel - ferritic

Ferritic is an economical and popular type of stainless steel with high chromium content (10.5%-30%) and low carbon (less than 0.1%). This type of stainless steel has a body-centered cubic (BCC) crystal structure and is magnetic. Unlike austenitic, ferritic cannot be hardened by heat treatment, but rather by cold rolling.

1. Advantages of Ferritic

• Good corrosion resistance
• Economical price
• Easy to mold
• Environmentally friendly

2. Disadvantages of Ferritic

• Lower strength
• Resistance to lower temperatures
• Non-hardenable by heat treatment

3. Ferritic Applications

• Household appliances (e.g., sink, refrigerator)
• Building panels
• Sistem pembuangan
• Exhaust systems
• Automotive (e.g., exhaust)
• Medical equipment
• Food and beverage industry

Martensitic

5 types of stainless steel - martensitic

Martensitic is a type of stainless steel that has a tetragonal crystal structure and is magnetic. This type of stainless steel has chromium (11.5%-18%) and carbon (0.1-1.2%) content which makes it strong and impact resistant.

Martensitic stainless steel is divided into two categories based on its carbon content, namely low and high carbon. Low carbon martensitic (0.05-0.25% carbon) is less strong, but more resistant to corrosion. High carbon martensitic (0.61-1.50% carbon) has higher strength, but is more brittle and cannot be welded or formed.

1. Advantages of Martensitic

• High strength and hardness
• High thermal conductivity
• Low coefficient of thermal expansion

2. Disadvantages of Martensitic

• Lower corrosion resistance compared to other stainless steel types
• Difficult to weld and form

3. Martensitic Applications

• Knives and cutting tools
• Machine components
• Surgical tools
• Sports equipment
• Military equipment

Duplex

5 types of stainless steel - duplex

Duplex is a type of stainless steel that combines the best properties of austenitic and ferritic. This type of stainless steel has chromium (22-25%), nickel (4-5%), and nitrogen (0.15-0.3%) contents that provide a balance of strength, corrosion resistance, and ductility.

1. Advantages of Duplex

• High strength
• Excellent corrosion resistance
• Good flexibility

2. Disadvantages of Duplex

• Higher price
• Lower availability

3. Duplex Applications

• Petrochemical industry
• Sea water treatment
• Paper industry
• Food and beverage industry
• Energy industry

Nitronic

5 types of stainless steel - nitronic

Nitronic termasuk dalam jenis stainless steel austenitic, namun menawarkan ketahanan panas tinggi dan alternatif performa yang lebih baik. Nitronic tersedia dalam berbagai jenis, termasuk Nitronic 309s dan Nitronic 310s. Masing-masing jenis memiliki komposisi dan sifat yang sedikit berbeda, sehingga cocok untuk aplikasi yang spesifik.

1. Advantages of Nitronic

• Twice the strength of 300 series stainless steels
• High heat resistance
• Impact resistance at low temperatures
• Easy to weld and fabricate
• Non-magnetic

2. Disadvantages of Nitronic

• More expensive price
• Not as widely available as other types of stainless steel
• Susceptibility to pitting corrosion

3. Nitronic Applications

• Machine components and structures that operate at high temperatures
• Chemical processing equipment
• Power generation equipment
• Petrochemical industry
• Food and beverage processing equipment

Stainless steel is a versatile material with various types and characteristics. By understanding the differences and characteristics of the 5 types of stainless steel that are often used in the industry, you can choose the right type for your needs, and ensure maximum performance and durability.

For those of you who are looking for high-quality austenitic stainless steel for various industrial purposes, SPINDO is the right choice. SPINDO, a steel pipe manufacturer with the largest production capacity and experience in Indonesia, offers a wide range of high-quality pipe and stainless steel, ranging from  ornamental tubes ideal for decoration and aesthetic applications to resilient industrial pipes for heavy industrial use.

SPINDO uses the best raw materials and implements strict quality control to ensure the products you receive are always of high quality. The SPINDO team is also ready to help you choose the right product and provide the best service. Contact SPINDO by clicking the WhatsApp button in the bottom right corner to get more information about its products and services.