X55MnCrN18-4 Cr-Mn-N Steel Round Bar

Product Description

X55MnCrN18-4 (Material Number 1.3817) is a high-nitrogen, austenitic stainless steel primarily known for its high strength, non-magnetic properties, and excellent resistance to stress corrosion cracking.

It is frequently utilized in specialized industrial applications, particularly in the power generation sector for generator retaining rings.

Material Specifications & Composition

This grade is characterized by its high manganese (Mn) and chromium (Cr) content, with nitrogen (N) acting as a powerful austenite stabilizer and strengthening agent.

Key Properties

• Non-Magnetic: Even after heavy cold working, the material remains fully austenitic and non-magnetic, which is critical for electrical and magnetic shielding components.

• High Mechanical Strength: The addition of nitrogen significantly increases the yield strength compared to standard austenitic grades like 304 or 316.

• Corrosion Resistance: While not as corrosion-resistant as high-nickel stainless steels in aggressive chemical environments, it provides excellent resistance to atmospheric corrosion and stress-induced cracking.

• Wear Resistance: The high manganese content contributes to good work-hardening characteristics.

Common Applications

Given its unique profile, X55MnCrN18-4 round bars are typically found in:

• Generator Retaining Rings: The primary application due to the need for high centrifugal strength and non-magnetic behavior.

• Electrical Engineering: Components requiring high strength without magnetic interference.

• Cryogenic Engineering: Maintaining toughness at extremely low temperatures.

• Specialized Fasteners: Heavy-duty bolts or pins in non-magnetic assemblies.

International Equivalents

If you are sourcing this material or looking for alternatives, it is often cross-referenced with:

• DIN/EN: 1.3817 / X55MnCrN18-4

• ASTM/AISI: Often compared to the ASTM A289 (Class B or C) standards for nitrogen-strengthened austenitic forgings.

• AFNOR: Z55MnCrN18-04

Processing Note

Shutterstock

Explore

Because this material is designed to provide high strength, it is often supplied in a cold-expanded or forged condition. Machining can be challenging due to its high work-hardening rate; therefore, using rigid setups and high-quality carbide tooling is recommended.