X5MnCrNiN18-13 Cr-Mn-N Steel Round Rods

Product Description

X5MnCrNiN18-13 (often associated with Werkstoffnummer 1.3813 or related non-magnetic armor/specialty grades) is a high-alloy, fully austenitic Chromium-Manganese-Nickel-Nitrogen stainless steel.

It is highly specialized, engineered primarily for applications requiring a combination of high mechanical strength, excellent toughness, and extremely low magnetic permeability (non-magnetic), even after severe cold working.

Here is a technical breakdown of its specifications, properties, and equivalent standards.

Chemical Composition (Typical Weight %)

The defining characteristic of this steel is the high manganese and nitrogen content, which stabilizes the austenite phase and significantly boosts yield strength without sacrificing toughness.

• Manganese (Mn) & Nitrogen (N): Work synergistically to increase proof strength and maintain a stable austenitic structure.

• Chromium (Cr): Ensures strong corrosion and oxidation resistance.

• Nickel (Ni): Stabilizes the matrix and ensures excellent low-temperature impact toughness.

Mechanical & Physical Properties (Solution Annealed)

Thanks to interstitial strengthening from Nitrogen, this grade offers significantly higher yield strength than standard 300-series austenitic steels (like 304 or 316).

Mechanical Properties

• Yield Strength ($R_{p0.2}$): $\ge 350\text{ MPa}$ (Significantly higher than standard 304's $\sim 210\text{ MPa}$)

• Tensile Strength ($R_m$): $650 - 850\text{ MPa}$

• Elongation ($A_5$): $\ge 35\%$

• Impact Energy (KV): $\ge 80\text{ J}$ (Maintained at sub-zero temperatures)

Key Physical Characteristics

• Magnetic Permeability ($\mu_r$): $\le 1.01\text{ H/m}$ (Stable even after heavy cold deformation or machining, making it virtually non-magnetic).

• Density: $7.9\text{ g/cm}^3$

International Cross-References & Equivalents

While X5MnCrNiN18-13 is an EN designation, it closely aligns with or belongs to a family of specialized non-magnetic and cryogenic steels across different global standards:

• DIN / EN Werkstoffnummer: 1.3813

• AFNOR (France): X5MnCrNiN18-13

• ASTM / AISI (USA): Often cross-referenced with XM-19 (Nitronic 50) or A286 depending on the specific application requirements, though its high Mn-content makes it most structurally similar to specialized Nitronic or military-grade non-magnetic specifications (e.g., MIL-S-23195 equivalents).

• GOST (Russia): Evaluated against high-Mn cryogenic grades like 03Kh13AG19 or 10Kh14G14N4T for similar mechanical profiles.

Core Applications

Because of its specific chemistry, this grade is typically sourced as round rods for precision machining in environments where magnetic interference must be completely avoided or where high structural integrity is required:

• Marine & Submarine Engineering: Non-magnetic components, propulsion shafts, and high-strength fasteners exposed to seawater.

• Defense Technology: Armor components, non-magnetic mine-sweeping equipment, and structural parts for military electronics.

• Cryogenic Equipment: Structural components in liquid gas installations where materials must resist brittle fractures at temperatures down to $-196^\circ\text{C}$.

• Scientific Instruments: Components for MRI machines, particle accelerators (like CERN hardware), and electron microscopes where stray magnetic fields distort results.

Processing & Machining Notes

• Machinability: Due to high manganese and nitrogen, this steel work-hardens rapidly. It requires rigid setups, sharp carbide tooling, low cutting speeds, and high feed rates to stay ahead of the work-hardened zone.

• Welding: Generally weldable using matching composition fillers or standard fully austenitic consumables (like 310 or specialized Ni-Cr-Mo alloys). Post-weld heat treatment (solution annealing at $1050^\circ\text{C} - 1100^\circ\text{C}$ followed by rapid cooling) is recommended to restore optimum corrosion resistance and non-magnetic properties.