1.3813 Cr-Mn-N Steel Round Bar

Product Description

Material designation 1.3813 (EN/DIN standard name X40MnCrN19 or X40MnCrN19K) represents a highly specialized, non-magnetic (amagnetic) austenitic alloy steel. It is distinctively structured with high manganese and targeted chromium and nitrogen additions, optimizing it for environments that require both structural integrity and a lack of magnetic permeability.

Here is a comprehensive overview of the technical specifications, chemical limits, and performance characteristics for 1.3813 round bars:

Chemical Composition (Mass Weight %)

The stabilizing element for the austenitic matrix in this grade is primarily Manganese ($\text{Mn}$), bolstered by Nitrogen ($\text{N}$), allowing it to maintain non-magnetic properties even after cold working.

Key Technical Properties

• Magnetic Permeability ($\mu$): $\le 1.01 \text{ G/Oe}$ in the solution-annealed/quenched condition. It remains exceptionally low ($\le 1.03 \text{ G/Oe}$) even after undergoing hot-cold working or light cold drawing, making it ideal for amagnetic environments.

• Corrosion Resistance: The addition of 3–5% Chromium combined with Nitrogen provides basic atmospheric rust and mild acid resistance compared to standard carbon steels, though it does not match the localized pitting resistance of high-nickel/high-chromium stainless grades like 316L.

• Electrical Resistivity: Approx. $0.75 \text{ }\mu\Omega\cdot\text{m}$ at 20°C.

Mechanical Properties (At Room Temperature)

Depending on the supply condition—whether solution annealed (quenched) or hot-cold worked (work-hardened)—the mechanical yields shift significantly:

Heat Treatment Guidelines

• Hot Forming: 1050°C to 850°C

• Solution Annealing (Quenching): 1000°C to 1050°C, followed by rapid cooling via water or forced air to ensure complete carbide and nitride dissolution into the solid matrix.

Primary Applications

Due to its unique combination of mechanical toughness, yield enhancement via cold working, and strictly stable non-magnetic baseline, 1.3813 round bars are primarily utilized in:

• Electrical Engineering: Components for generators, high-voltage transformers, and amagnetic shielding structures.

• Marine & Shipbuilding: Highly stressed components near sensitive navigational or magnetic sensing equipment.

• Heavy Machinery: Non-magnetic heavy-duty fasteners, connecting pins, shafts, and arbors.

• Specialized Hardware: Heavy-duty amagnetic clamping hardware, studs, and specialized heavy bolts.