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X15TN Stainless Steel Round Bar | UNS S42025

X15TN stainless steel is a nitrogen-alloyed martensitic stainless grade developed by Aubert & Duval for high hardness, wear resistance and corrosion resistance in the specified treated condition. Its verified designations include UNS S42025, X40CrMoVN16-2 and EN 1.4123. This is a specialty alloy and not interchangeable with ordinary Type 420 or 440C without qualification.

Download Mozaic X15TN Technical Reference (PDF)

X15TN Stainless Steel — Manufacturer Composition Reference

Reference chemistry from Aubert & Duval’s X15TN brochure; actual order specification and mill test report govern
Grade attribute Manufacturer reference
Grade / UNS / European grade X15TN / S42025 / 1.4123 / X40CrMoVN16-2
Carbon (C) 0.37–0.45 wt%
Chromium (Cr) 15.00–16.50 wt%
Molybdenum (Mo) 1.50–1.90 wt%
Vanadium (V) 0.20–0.40 wt%
Nitrogen (N) 0.16–0.25 wt%
Silicon and manganese 0.60 wt% maximum each
Typical applications Surgical instrument components, cutting blades, friction components and specialty tooling
Purchasing condition Specify actual annealed, hardened and tempered condition and qualified product standard

These are manufacturer-published grade reference ranges, not a guarantee for a specific heat. For regulated medical devices, confirm material qualification, testing and applicable regulatory requirements before use.

Applications and Heat Treatment

X15TN is a specialty high-hardness grade with nitrogen and molybdenum additions. Its wear, pitting resistance and hardness depend on heat treatment and finish. Aubert & Duval describes cutting, surgical and friction applications. Do not assume another martensitic stainless grade has the same microstructure or performance.

Precision Ground X15TN Bar Stock

Mozaic Precision Metals can evaluate X15TN bar sourcing and precision centerless grinding, polishing and cut-to-length services subject to availability, condition, and dimensional specifications. Please state the exact alloy designation, product form, finished OD, tolerance, bar length, surface finish, required certificates and quantity.

Related Material Comparisons

See Type 420 stainless steel and 440C stainless steel for different martensitic grades; engineering substitution requires qualification.

Request an X15TN Quote

Request pricing and availability, email sales@mozaicprecision.com or call 847-637-8379.

Source: Aubert & Duval X15TN manufacturer grade listing and X15TN technical brochure.

X15TN contains chromium, molybdenum, vanadium, and nitrogen. Its performance depends on heat treatment and the finished surface condition, so hardness and mechanical properties should not be treated as fixed values for every supplied bar.

Specify whether you require material for machining before hardening or stock in a defined heat-treated condition. Include the required hardness range and any restrictions on subsequent processing.

Where your drawing names X15TN, UNS S42025, or X40CrMoVN16-2, provide the complete specification and revision. Any proposed material substitution requires your approval.

 

Grinding & Finishing X15TN Bar Stock

For components requiring controlled outside diameters, Mozaic offers centerless grinding and polishing, subject to review of material condition and part requirements.

Provide the starting diameter, finished diameter and tolerance, surface roughness, and available stock allowance. If heat treatment will follow, identify any allowance needed for subsequent finishing.

For instrument or tooling applications, include restrictions on surface marks and any downstream passivation or other finishing requirements so the processing sequence can be reviewed.

Material Certification & Identification

Include the material certificates, heat identification, and inspection documentation required for your order. Mozaic Precision Metals is ISO 9001:2015 certified, with order requirements reviewed before processing.

Request an X15TN Round Bar Quote

Send your drawing or material specification, required condition and hardness, diameter, length, quantity, and delivery date. Let us know whether you need material supply or processing of stock you already own.

Contact Mozaic Precision Metals to review availability, processing options, and pricing.