Optical Table Raw Materials: Stainless Steel Types and Selection Guide

Optical Table Raw Materials: Stainless Steel Classification and Proper Selection

Selecting the right raw material is critical for achieving stability, durability, and precision in an optical table. Stainless steel is one of the most commonly used materials for optical table panels due to its excellent mechanical properties and corrosion resistance.

Stainless steel is typically classified based on its microstructure into three main types:

• Martensitic stainless steel
• Ferritic stainless steel
• Austenitic stainless steel

Each type offers different performance characteristics. Choosing the appropriate material depends on the specific requirements of the optical table.

Common Stainless Steel Choices for Optical Table Panels

Based on comprehensive evaluation, different stainless steel grades are selected for different optical table structures:

• Martensitic stainless steel 1Cr13 (410) — used for welded table panels
• Ferritic stainless steel 1Cr17 (430) — used for honeycomb table panels
• Austenitic stainless steel 0Cr18Ni9 (304) — used for non-magnetic table panels

These selections ensure optimal performance for each application.

1. Martensitic Stainless Steel 1Cr13 (410)

Martensitic stainless steel has a martensitic microstructure and is magnetic. Its mechanical properties can be adjusted through heat treatment, making it a hardenable stainless steel.

Key characteristics include:

• High strength
• High rigidity
• Heat treatable
• Magnetic properties

The martensitic structure often appears needle-like under metallographic observation. High strength and stiffness are the most important features of this material.

Welded optical tables require excellent rigidity and load-bearing capability. Therefore, martensitic stainless steel 1Cr13 (410) is an ideal choice for welded table panels.

Figure：Martensite

2. Ferritic Stainless Steel 1Cr17 (430)

Ferritic stainless steel has a body-centered cubic crystal structure and is also magnetic. It offers several advantages:

• High thermal conductivity
• Low thermal expansion coefficient
• Good oxidation resistance
• Excellent stress corrosion resistance

However, ferritic stainless steel has lower plasticity and reduced corrosion resistance after welding, which limits its use in welded structures.

Honeycomb optical tables rely on their internal honeycomb core for strength and stiffness and do not require extensive welding. Therefore, ferritic stainless steel 1Cr17 (430) is suitable for honeycomb table panels.

Figure：Ferrite structure with body-centered cubic crystal structure

Figure: Ferrite structure

3. Austenitic Stainless Steel 0Cr18Ni9 (304)

Austenitic stainless steel features a face-centered cubic structure and is non-magnetic. Due to its higher chromium and nickel content, it provides:

• Excellent corrosion resistance
• Strong oxidation resistance
• High toughness
• Good plasticity
• Excellent machinability
• Good weldability

Because of its comprehensive performance, austenitic stainless steel is widely used across industries.

Non-magnetic optical tables require materials that do not interfere with magnetic-sensitive experiments. Therefore, austenitic stainless steel 0Cr18Ni9 (304) is the preferred choice for non-magnetic table panels.

Figure：Austenitic microstructure with face-centered cubic crystal structure

Figure：Austenitic structure

Why Material Selection Matters for Optical Tables

Choosing the correct stainless steel type ensures:

• Better vibration stability
• Higher structural rigidity
• Reduced magnetic interference
• Improved corrosion resistance
• Longer service life

Each stainless steel type serves a specific purpose, and selecting the appropriate material directly impacts optical experiment precision.

Conclusion

Different optical table designs require different material properties. Martensitic 410 stainless steel provides high strength for welded structures, ferritic 430 stainless steel suits honeycomb tables, and austenitic 304 stainless steel is ideal for non-magnetic applications.

Proper stainless steel selection ensures optimal performance, reliability, and long-term stability in optical table construction.