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XM-19 stainless steel, also known as Nitronic 50 (UNS S20910), is a high-strength, nitrogen-alloyed austenitic stainless steel commonly specified for applications requiring a combination of mechanical strength, corrosion resistance, and dimensional stability. It is frequently used in shafting, fasteners, and machined components operating in corrosive or high-load environments.
Unlike precipitation-hardened stainless steels, XM-19 achieves its strength through alloy composition and cold working rather than heat treatment, resulting in consistent mechanical properties and structural stability.
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Material Overview: XM-19 Stainless Steel
XM-19 is engineered to deliver significantly higher strength than conventional austenitic stainless steels while maintaining excellent corrosion resistance. Its nitrogen content enhances yield strength and improves resistance to pitting and crevice corrosion.
Key characteristics include:
High yield and tensile strength
Stable austenitic microstructure
Good corrosion resistance in chloride environments
Non-magnetic in the annealed condition
These properties make XM-19 suitable for demanding mechanical applications where both strength and corrosion resistance are required.
Shafting Applications for XM-19 Bar Stock
XM-19 bar stock is commonly specified for shafting and load-bearing components where standard austenitic grades may lack sufficient strength. Typical applications include:
Precision shafting
Marine and offshore components
Valve stems and fasteners
Pump and compressor shafts
Structural and load-bearing machined parts
Its higher yield strength allows designers to reduce cross-sectional area while maintaining mechanical performance.
Machining and Grinding Considerations
XM-19 machines differently than free-machining stainless grades due to its higher strength and work-hardening characteristics. Proper tooling, feed rates, and coolant application are essential to maintain surface quality and dimensional accuracy.
Grinding considerations:
Suitable for centerless grinding operations
Maintains dimensional stability during precision finishing
Capable of achieving controlled surface finishes for shafting
Performs well in long-bar grinding applications
Centerless grinding is commonly used to produce straight, round XM-19 bar stock for shafting and precision components.
Common Product Forms
XM-19 is typically supplied in:
Round bar
Precision shafting
Centerless ground bar stock
Precision-ground forms are preferred for applications requiring tight diameter tolerances, straightness, and consistent surface quality.
Performance Compared to Other Stainless Grades
Relative to other stainless steels:
Provides significantly higher strength than 304 and 316
Offers improved corrosion resistance over many martensitic grades
Maintains greater toughness than precipitation-hardened stainless steels in certain environments
These attributes make XM-19 a reliable material choice for mechanically demanding and corrosion-sensitive applications.
Mozaic Precision | XM-19 (Nitronic 50)
XM-19 (Nitronic 50) bar stock is specified for applications requiring high strength, corrosion resistance, and dimensional stability without reliance on heat treatment. When supplied as precision shafting or centerless ground bar, it delivers consistent performance in demanding mechanical environments.
Its balanced mechanical and corrosion properties make XM-19 a preferred choice for shafting and machined components in industrial, marine, and high-load applications.