NAS NM15M Cr-Mn-N Steel Round Bar

Product Description

NAS NM15M is a specialized high-manganese, non-magnetic austenitic stainless steel primarily utilized in environments where high strength and zero magnetic permeability are required. It is often compared to or used as a replacement for standard 300-series stainless steels when magnetic interference is a critical concern.

Key Characteristics

• Non-Magnetic Properties: Even after heavy cold working, NM15M maintains extremely low magnetic permeability ($\mu \leq 1.01$). This makes it ideal for sensitive electronic or medical equipment.

• High Strength: Due to the nitrogen (N) and manganese (Mn) alloying, it offers significantly higher yield strength than standard grades like 304 or 316.

• Corrosion Resistance: While it has good general corrosion resistance, the high manganese content (replacing some nickel) means it is specifically optimized for structural stability rather than extreme chemical pitting resistance.

Chemical Composition (Typical)

The "Cr-Mn-N" designation highlights its departure from traditional Nickel-based austenitics:

Mechanical Properties

In the solution-annealed condition, NM15M typically exhibits the following:

• Tensile Strength: $\geq 700$ MPa

• Yield Strength (0.2% Offset): $\geq 350$ MPa

• Elongation: $\geq 35\%$

• Hardness: $\approx 200$ HBW

Common Applications

NAS NM15M round bars are frequently used in:

• Medical Technology: Components for MRI (Magnetic Resonance Imaging) machines where magnetic materials would interfere with the imaging.

• Electronics: Brackets and frames for high-precision sensors or measurement instruments.

• Marine & Defense: Non-magnetic mine-sweeping equipment or structural parts for naval vessels where a low magnetic signature is mandatory.

• Linear Motors: Structural supports for Maglev components or high-speed automated machinery.

Equivalent Designations

While NAS NM15M is a proprietary designation by Nippon Yakin Kogyo, it falls under the broader category of High-Mn Austenitic Steels. If you are looking for international standards to cross-reference, you might look at:

• ASTM A289: (Standard Specification for Alloy Steel Forgings for Nonmagnetic Retaining Rings).

• ISO 15510: Check for high-nitrogen austenitic grades (e.g., X12CrMnN18-8-5 types).