Datalloy 2 Cr-Mn-N Steel Round Bar

Product Description

Datalloy 2 is a high-strength, non-magnetic austenitic chromium-manganese-nitrogen steel. It is a proprietary grade (developed by Deutsche Edelstahlwerke / DEW) that corresponds to the Material Number 1.3819 (X40MnCrN18-18).

Within the hierarchy of Cr-Mn-N steels you’ve been exploring, Datalloy 2 is considered a premium, high-alloyed version, sitting just below the P900 (1.3816) in terms of overall alloy content but offering superior corrosion resistance and strength compared to the 1.3813 or 1.3815 series.

Technical Profile: Datalloy 2 (1.3819)

The defining characteristic of Datalloy 2 is its "18-18" balance—roughly 18% Manganese and 18% Chromium. This high chromium content makes it significantly more resistant to corrosion than the lower-chromium variants like 1.3813.

Key Performance Attributes

• Non-Magnetic Stability: It possesses extremely low magnetic permeability ($\mu_r \leq 1.005$), which remains stable even after heavy cold working.

• Corrosion Resistance: Unlike the 1.3815/1.3817 grades (which have ~4% Cr), Datalloy 2 is effectively a stainless non-magnetic steel. It provides excellent resistance to organic acids and salts.

• Mechanical Strength: Due to the high Nitrogen content, it achieves very high yield strengths. Like its siblings, it is typically strengthened via cold expansion or cold drawing rather than traditional heat treatment.

• Resistance to Stress Corrosion Cracking (SCC): It was specifically engineered to avoid the SCC issues common in earlier generator ring materials when exposed to moisture.

Primary Applications

Datalloy 2 round bars are predominantly used in high-tech energy and exploration sectors:

• Oil & Gas (MWD/LWD): Used for "Measurement While Drilling" tool housings and drill collars where the tools must be non-magnetic to allow compass-based navigation but strong enough to withstand deep-well pressures.

• Power Generation: Generator retaining rings and high-load non-magnetic components.

• Marine Engineering: Components for mine-sweeping vessels or other naval applications where a zero-magnetic signature is mandatory.

• Electronic Shielding: Structural parts in high-field magnets (e.g., MRI machines).

Comparison: Datalloy 2 vs. P900

While both are "18-18" steels, the primary difference often lies in the Carbon content:

• P900 (1.3816): Features lower carbon ($\leq 0.12\%$), relying almost entirely on nitrogen for strength. This makes it slightly more resistant to intergranular corrosion.

• Datalloy 2 (1.3819): Features higher carbon ($0.40\%$), which provides a different work-hardening profile and can be more cost-effective for certain manufacturing processes.

Fabrication Note

• Machinability: Very difficult. The 18% Manganese causes the material to work-harden the instant a tool touches it. It requires high-torque machines, low RPMs, and constant, heavy chip loads to stay "under" the work-hardened layer.

• Heat Treatment: Supplied in a solution-annealed state. Heating it above $1050^\circ\text{C}$ followed by a water quench ensures the most stable non-magnetic and corrosion-resistant state.