Grade dossier
Nitronic 50 Stainless Steel for High Strength and Corrosion Resistance
A nitrogen-strengthened austenitic stainless grade combining high annealed strength, useful corrosion resistance and low-temperature toughness.
Identity before substitution
Define the grade, product and condition together
A familiar grade name is not a complete purchase specification. Product form, controlling standard, dimensions, condition, finish, certification and service environment determine whether the delivered material is suitable.
Composition control
ASTM A240/A240M flat-product chemistry
Limits are not heat analysis targets
The table summarizes grade limits commonly used for plate, sheet and strip. Pipe, tube, bar, forgings and cast products can be governed by different specifications. Always place the product standard and edition on the purchase order.
| C | 0.06 max |
|---|---|
| Mn | 4.00-6.00 |
| Si | 1.00 max |
| P | 0.040 max |
| S | 0.030 max |
| Cr | 20.50-23.50 |
| Ni | 11.50-13.50 |
| Mo | 1.50-3.00 |
| N | 0.20-0.40 |
| Nb | 0.10-0.30 |
| V | 0.10-0.30 |
Properties with context
Minimums, typical indicators and delivered condition
Specified annealed flat-product values
| Annealed tensile strength | 690 MPa min reference |
|---|---|
| Annealed 0.2% yield | 380 MPa min reference |
| Elongation | 35% min reference |
| Condition note | High-strength conditions have separate requirements |
Selection indicators
| Density | about 7.9 g/cm3 |
|---|---|
| Strength mechanism | Nitrogen solid-solution strengthening |
| Magnetic response | Generally low annealed; may change with processing |
| Toughness | Useful subzero toughness in appropriate conditions |
Values depend on product form, thickness, test orientation, condition and governing edition. Use the mill test certificate and the purchase specification for acceptance, not a web table alone.
Selection boundary
Where Nitronic 50 belongs and where to escalate
Grade selection is an environmental decision, not a popularity contest. Review the complete medium, temperature, geometry, fabrication, cleaning and inspection requirements.
Good reasons to evaluate it
Marine shafts and pump components after corrosion review
Fasteners and valve components
High-strength cryogenic structures under approved rules
Parts requiring S20910 chemistry and condition
Reasons to stop and review
Ordering by trade name without condition
Using high-strength bar values for annealed sheet
Assuming equivalence to duplex stainless
Selecting for warm chloride crevices without data
Fabrication route
Protect properties through cutting, forming and welding
Specify UNS S20910, condition and product standard.
Account for high work hardening in machining and forming.
Qualify welding for strength and corrosion retention.
State magnetic, toughness and NDE requirements when critical.
Supply definition
Product form changes the applicable requirements
Do not send an RFQ that names only the grade. State form, governing standard, dimensions, tolerances, finish, edge or end condition, quantity, certification and inspection.
Bar and shapes under ASTM A276/A479
Plate, sheet and strip under applicable specifications
Forgings and fasteners
Shafts, valve trim and pump components
Certificate checkpoint
Request heat identity, chemical analysis, mechanical results and compliance to the exact product specification. Add PMI, corrosion testing or supplementary examination only when the application requires it.
Interactive selection check
Test Nitronic 50 against the controlling question
Procurement FAQ
Questions to close before placing the order
Is Nitronic 50 stainless steel magnetic?
Magnetic response depends on microstructure and delivered condition.
Can Nitronic 50 replace another grade?
Only after checking the governing standard, composition, mechanical properties, corrosion exposure, fabrication route and certification. A commercial name is not a substitution approval.
Does the table apply to every product form?
No. Annealed, hot-rolled and high-strength S20910 conditions have different minimum properties. The RFQ must state condition.
What should a Nitronic 50 RFQ include?
Product form, standard and edition, UNS or EN designation, dimensions, tolerances, finish, quantity, service, fabrication, certificate and inspection requirements.
Sources, scope and RFQ
Use traceable grade data, then specify the actual product
ASTM A276/A479 and product-form requirements for UNS S20910
Rolled Alloys N-50 product identification
UNS/ASTM composition framework for S20910
Project-specific corrosion and strength qualification data