1.3819 Cr-Mn-N Steel Round Bar

Product Description

1.3819 (commonly designated under the EN standard as X40MnCrN19-14 or X40MnCrN19) is a specialized high-carbon, high-manganese Chromium-Manganese-Nitrogen (Cr-Mn-N) fully austenitic stainless steel.

Supplied primarily as hot-rolled or forged round bars, this grade is engineered for applications demanding a combination of high mechanical yield strength, superior wear and abrasion resistance, and permanent non-magnetic stability under extreme cyclic or physical deformation.

Chemical Composition (Typical Weight %)

Similar to the 1.3817 (X50MnCrV20-14) grade, 1.3819 utilizes an elevated carbon content alongside massive manganese additions to fix a stable austenite phase while forming microscopic carbide networks that mitigate wear.

• Manganese (Mn): At roughly 20%, it acts as the primary austenite stabilizer, ensuring the steel remains entirely non-magnetic across all processing ranges.

• Carbon (C) & Nitrogen (N): Provide intense interstitial strengthening. The carbon bonds into carbide phases to enhance base hardness and abrasion resistance.

• Chromium (Cr): Increases nitrogen solubility in the melt and delivers localized corrosion protection.

Mechanical & Physical Properties

The 1.3819 alloy features a rapid work-hardening rate, making its finished properties highly dependent on the degree of cold drawing or mechanical strain applied during production.

Mechanical Properties (Varies by Strain-Hardened State)

• Yield Strength ($R_{p0.2}$): $\ge 430 - 460\text{ MPa}$ (Solution Annealed) | Can exceed $900 - 1100\text{ MPa}$ when strategically cold-worked.

• Tensile Strength ($R_m$): $740 - 950\text{ MPa}$

• Elongation ($A_5$): $\ge 25 - 30\%$

• Impact Energy (KV): $\ge 50 - 65\text{ J}$

Key Physical Properties

• Magnetic Permeability ($\mu_r$): $\le 1.005\text{ H/m}$ (Exhibits excellent magnetic insulation; the microstructure will not form magnetic martensite even under severe frictional stress or twisting).

• Density: $7.85\text{ g/cm}^3$

International Cross-References & Common Standards

• Standard Material Number: WNr 1.3819

• DIN / EN Short Name: X40MnCrN19-14 (sometimes shortened to X40MnCrN19)

• Classification: Non-magnetic specialty structural steel / Generator end-ring steel modification.

• Proprietary / Industrial Relatives: Part of the high-strength non-magnetic families like P900 variants or specialty Staballoy types specialized for high wear resistance.

Core Applications for 1.3819 Round Bars

Because 1.3819 round bars maintain absolute non-magnetic integrity while offering excellent resistance against surface gouging and mechanical fatigue, they are commonly routed into heavy industrial, energy, and defense systems:

• Electrical Generator Engineering: Rotor retaining rings and supporting components for large turbogenerators that require high containment strength without creating magnetic stray-current heating loops.

• Directional Oil & Gas Drilling Tools: Thick-walled non-magnetic parts, housing components, and shafts for MWD (Measurement While Drilling) systems operating near electronic tracking instrumentation.

• High-Wear Non-Magnetic Guide Rollers: Structural shafts, wear-pins, and tracking rods located inside high-voltage electrical stations or industrial induction furnaces.

• Naval Countermeasure Hardware: Non-magnetic heavy fasteners, structural tie-rods, and drive shaft components placed near sensitive magnetic acoustic sensor matrices.

Machining & Processing Notes

• Machinability: Due to its combined high carbon composition and an extreme strain-hardening exponent, 1.3819 is considered difficult to machine. Tooling will glaze rapidly if allowed to dwell. It requires low surface cutting speeds, constant positive feed rates, rigid clamping, and premium coated carbide or ceramic inserts to cut below the hard crust formed by previous tool passes.

• Heat Treatment: This grade cannot be hardened or tempered via standard thermal cycles. To relieve stresses or dissolve coarse precipitates, it is solution-annealed between $1020^\circ\text{C} - 1080^\circ\text{C}$ followed by a rapid water quench. Higher strength values are achieved solely through physical strain hardening.

• Welding: Welding is generally restricted or requires careful planning. High local heat inputs can cause localized carbon/carbide segregation along the heat-affected zone (HAZ), reducing impact toughness and potentially altering the local magnetic permeability profile.