Nitronic 50 Round Bar
➡️ UNS S20910 | XM-19 | 22-13-5 stainless steel | N-50
➡️ ASTM, EN, JIS & International Standards
➡️ Supply Conditions
➡️ Multiple Diameters & Supply Lengths
➡️ Global Export & International Delivery
Country of Origin:
Europe, Japan, USA
Material Type:
Stainless Steel
UNS Number:
UNS S20910
Wr. No.:
1.3964
MTC Available:
EN 10204 3.1
Product Description for Nitronic 50 Round Bar
Nitronic 50 round bar is a high-strength, nitrogen-strengthened austenitic stainless steel bar product supplied under UNS S20910, generically designated XM-19 in ASTM A276 and ASTM A479. “Nitronic 50” is a registered trademark of Cleveland-Cliffs (formerly AK Steel/Armco); the same underlying alloy is also traded generically as XM-19 or 22-13-5 stainless.
The alloy is alloyed with elevated chromium (20.5–23.5%), nickel (11.5–13.5%), molybdenum (1.50–3.00%), manganese (4.00–6.00%), and controlled nitrogen, with small additions of niobium (columbium) and vanadium. This combination produces mechanical strength roughly double the room-temperature yield strength of Types 304 and 316 in the standard annealed condition, while retaining a fully austenitic structure. Corrosion resistance is superior to Types 316, 316L, 317, and 317L in many media, including improved resistance to pitting, crevice attack, and intergranular corrosion, along with excellent resistance to sulfide stress cracking. Unlike many austenitic grades, Nitronic 50 does not become significantly magnetic after severe cold working or exposure to sub-zero temperatures, and it retains good mechanical properties from cryogenic temperatures (-196°C) to moderately elevated service temperatures (up to roughly 650°C under ASME Section VIII rules for the high-strength condition).
Round bar is supplied in the standard annealed condition (solution annealed at 1066–1121°C) as the default, with High-Strength (HS) and Super High-Strength (Super HS) conditions available from the producer via special hot-working practices for applications requiring a higher guaranteed yield strength; these strengthened conditions cannot be re-forged, welded, or brazed without loss of the enhanced properties. The material is readily fabricated by machining and welding using conventional austenitic techniques, though machining requires more rigid tooling than for Types 304/316 due to higher strength and work-hardening tendency.
Typical industries include oil and gas (including sour-service applications qualified under NACE MR0175/ISO 15156-3 and NACE MR0103, at hardness levels up to HRC 35 maximum), offshore and subsea equipment, marine and naval engineering, chemical, petrochemical, and fertilizer processing, nuclear fuel recycling, pulp and paper, textile, and food processing. Buyers should confirm the required condition (annealed vs. HS vs. Super HS), the applicable product standard (A276 for bar and shapes, A479 for bar for boilers/pressure vessels, A314 for bar and billet), and any sour-service hardness qualification before specifying, since strength, corrosion resistance, and NACE compliance vary by condition.
Common Applications of Nitronic 50 Round Bar
➡️ Machined shafts, spindles, valve stems, pump sleeves and pins for food, beverage, dairy and pharmaceutical equipment, where the passive chromium oxide film resists both product acids and caustic clean-in-place chemicals.
➡️ Fasteners, studs, bolts, threaded rod and anchor components produced from bar stock, chosen for corrosion resistance combined with the ductility needed for cold heading and thread rolling.
➡️ Chemical, water treatment and general process plant parts such as agitator shafts, flange blanks, nozzles and support components handling water, steam and mildly corrosive media free of significant chlorides.
➡️ Architectural and structural hardware including handrail stanchions, balustrade fittings, tension rods and bollards, where a bright ground or polished bar finish provides both appearance and low maintenance.
International Equivalent Grade for N50 Round Bar
Standard
Country / Region
Grade
ASTM / AISI / SAE / UNS
USA
UNS S20910 (XM-19), per ASTM A276, A479, A314
JIS
Japan
-
EN
Europe
EN 1.3964
BS
United Kingdom
UNS S20910 / XM-19 / ASTM A276
GB / GB/T
China
-
KS
South Korea
-
South Korea
International
-
MS / SIRIM
Malaysia
-
Technical Specification for Nitronic 50 Round Bar
Specification
Value
Unit
Material
Stainless Steel
-
Grade
UNS S20910 (XM-19)
-
Product Form
Round bar
-
Diameter
Depends on mill/stockist range; HS/Super HS availability varies by diameter
mm
Length
Standard mill lengths or cut-to-size
mm / m
Manufacturing Process
Hot rolled or hot forged; standard condition solution annealed. HS/Super HS conditions produced by special hot-working practice (not annealed)
-
Surface Finish
Black hot-rolled, turned, ground, or polished (per order)
-
Heat Treatment
Solution annealed at 1066°C (1950°F) for optimum strength + good corrosion resistance, or 1121°C (2050°F) for maximum corrosion resistance in as-welded/strongly corrosive service
-
Delivery Condition
Annealed (standard); High-Strength (HS) and Super High-Strength (Super HS) available, size-dependent, on request
-
Tolerance Standard
Per ASTM A484 (general stainless bar tolerances) unless otherwise agreed
-
Dimensional Tolerance
Depends on tolerance class specified (h9, h11, etc.)
mm
Straightness
Per ASTM A484 / mill standard practice
mm/m
Carbon Equivalent (CEV)
Not applicable
-
Density
7.88 (24°C)
g/cm³
Magnetic Properties
Non-magnetic; magnetic permeability ~1.004 annealed, remains ~1.003–1.004 even after 75% cold reduction (per producer test data)
-
Corrosion Resistance
Superior to Types 316, 316L, 317, 317L in many media (per producer laboratory corrosion data); good resistance to pitting, crevice corrosion, intergranular attack, and sulfide stress cracking
-
Thermal Conductivity
15.6 (at 149°C) rising to 25.2 (at 816°C)
W/(m·K)
Electrical Resistivity / Conductivity
82 (at 21°C)
microhm-cm
Specific Heat
Not stated in the producer's product data bulletin; not independently confirmed
-
Coefficient of Thermal Expansion
16.2 (21–93°C), rising to 20.0 (21–871°C)
µm/(m·K)
Melting Range
1415–1452
°C
Modulus of Elasticity (tension)
199 (room temperature)
GPa
Poisson's Ratio
0.312
-
Technical Specifications
Get the key technical specifications for Nitronic 50 Round Bar
Nitronic 50 round bar is identified by UNS S20910 and the ASTM generic designation XM-19, primarily referenced in ASTM A276 (bar and shapes), ASTM A479 (bar for boilers and pressure vessels), and ASTM A314 (bar and billet).
It is not hardenable by heat treatment; the standard delivery condition is solution annealed at either 1066°C (1950°F) recommended for most applications as it provides higher mechanical properties with good corrosion resistance or 1121°C (2050°F), which should be specified when the material will be used in the as-welded condition in strongly corrosive media, since it minimizes intergranular attack risk.
High-Strength (HS) and Super High-Strength (Super HS) conditions are available from the producer through special hot-rolling or rotary-forging practices; because the added strength comes from mill processing, these conditions cannot subsequently be hot-forged, welded, or brazed without losing the enhanced properties, and HS/Super HS bars produced by rotary forging may show somewhat reduced corrosion and sulfide-stress-cracking resistance compared to bar-mill HS product.
Both the annealed and HS conditions have been qualified under NACE MR0175/ISO 15156-3 and NACE MR0103 for sour-service use, subject to a hardness ceiling of HRC 35 maximum not every condition or heat automatically meets this, so sour-service qualification should be confirmed per heat/lot.
Carbon Equivalent (CEV) does not apply, as this parameter is used for weldability assessment of carbon and low-alloy steels, not fully austenitic stainless steels. Buyers should always confirm diameter range, delivery condition, and applicable standard with the supplying mill before order placement, since minimum guaranteed properties can vary by condition and, in some cases, by producer
Chemical Composition for Nitronic 50 Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
-
0.06
%
Chromium
Cr
20.50
23.50
%
Nickel
Ni
11.50
13.50
%
Molybdenum
Mo
1.50
3.00
%
Manganese
Mn
4.00
6.00
%
Silicon
Si
-
1.00
%
Phosphorus
P
-
0.040
%
Sulfur
S
-
0.030
%
Nitrogen
N
0.20
0.40
%
Iron
Fe
Balance
Balance
%
Niobium (Columbium)
Nb (Cb)
0.10
0.30
%
Vanadium
V
0.10
0.30
%
Chemical Composition
View the chemical composition and applicable material limits for N50 Round Bar
The composition of Nitronic 50 is engineered around nitrogen as the primary strengthening element: nitrogen occupies interstitial sites in the austenite lattice, producing substantial solid-solution strengthening without the need for heat-treatable hardening.
Elevated chromium (20.5–23.5%) and molybdenum (1.5–3.0%) work together with nitrogen to raise pitting and crevice corrosion resistance well above Types 304 and 316, particularly in chloride-bearing environments producer laboratory data show Nitronic 50 resisting ferric chloride pitting and crevicing conditions that visibly pit and crevice-corrode Type 316 bar.
Nickel (11.5–13.5%) stabilizes the austenitic structure and supports toughness, including at sub-zero temperatures down to -196°C. Manganese (4.0–6.0%) increases nitrogen solubility during melting, allowing the higher nitrogen content to be achieved, and also contributes modestly to strength.
Niobium and vanadium additions form fine carbonitrides that help control grain structure and add incremental strength. Low carbon (0.06% max) minimizes chromium carbide precipitation at grain boundaries, supporting resistance to intergranular corrosion, including in simulated heat-affected-zone conditions.
The combined effect is a fully austenitic, non-magnetic stainless steel significantly stronger than conventional 300-series grades while remaining weldable and machinable, though machining requires more rigid tooling and positive cutting action due to a pronounced work-hardening tendency (machinability is roughly 21% of AISI B1112 free-machining steel, versus ~45% for Type 304, per producer machinability testing).
Mechanical Properties for Nitronic 50 Round Bar
Mechanical Property
Value
Unit
Tensile Strength
690 (100) min
MPa (ksi)
Yield Strength (0.2% Offset)
379 (55) min
MPa (ksi)
Elongation
35 min
%
Reduction of Area
55 min
%
Hardness
HRC 35 max
HRC
Impact / Charpy Properties
Per producer bulletin: 27 J (20 ft-lb) min at -196°C with 0.381 mm min lateral expansion; 20 J (15 ft-lb) min at -60°C with 0.381 mm min lateral expansion — confirm whether this applies under your governing standard (e.g., AMS 5764) as it is not a universal ASTM A276 base requirement
J
Proof Stress / 0.2% Proof Strength
379 (55) min
MPa (ksi)
Ultimate Tensile Strength
690 (100) min
MPa (ksi)
Mechanical Properties
Check the key mechanical properties and performance requirements of N50 Round Bar
In the annealed condition, minimum yield strength of 379–415 MPa (depending on whether the base ASTM A276 floor or the producer’s own guarantee applies) is roughly double the annealed minimum yield strength of Types 304/316, allowing Nitronic 50 to be used in load-bearing components at reduced section size compared to conventional austenitic grades.
The 35% minimum elongation and 55% minimum reduction of area indicate good ductility despite the elevated strength, supporting cold forming and resistance to sudden overload without brittle failure.
These properties are retained from cryogenic temperatures (-196°C) to moderately elevated service, which is a distinguishing characteristic versus conventional 300-series stainless steels.
The alloy is not hardenable by heat treatment, higher strength beyond the annealed minimums is obtained only by specifying the High-Strength or Super High-Strength condition, both of which trade some ductility and, in HS bars produced by rotary forging, some corrosion resistance, for increased yield strength; the strength increase is also size-dependent, being most pronounced in smaller diameters.
Machinability and formability are broadly comparable to other high-nickel austenitic stainless steels but require rigid tooling, positive cutting action, and adequate cooling due to a pronounced work-hardening tendency producer testing shows Nitronic 50 machining at roughly half the cutting rate used for Types 304/316 with high-speed tool steel, improving with coated carbide tooling.
Dimension / Sizes for Nitronic 50 Round Bar
Dimension / Size
Value
Unit
Diameter
Depends on mill/stockist manufacturing range; HS condition approaches annealed-level properties above 76.2 mm and is offered up to 254 mm via ESR/rotary forging on request - confirm with supplier
mm
Standard Length
Typically random mill lengths (e.g., 3–6 m) or supplier standard lengths
mm / m
Custom Length
Cut-to-length available from most stockists
mm / m
Diameter Tolerance
Per ASTM A484 tolerance class specified at order (e.g., h9, h11)
mm
Length Tolerance
Per supplier standard practice
mm
Straightness Tolerance
Per ASTM A484
mm/m
End Condition
As-sawn or as-cut, per order
-
Surface Finish
Hot-rolled/black, turned, ground, or polished
-
Out-of-Roundness
Per ASTM A484 tolerance class
mm
Ovality
Per ASTM A484 tolerance class
mm
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for N50 Round Bar
Pricing for Nitronic 50 Round Bar
Round Bar Prices are generally quoted per kilograms or meters tonnes and can fluctuate with the global raw material and market prices. The final price will depend on a variety of factors, including the grade size, diameter, length, surface finish, the quantity and whether the bars are cut to length or in standard lengths.
For smaller quantities, we can also quote per metre or per piece basis once the required dimensions have been confirmed. Container-loads or orders that are larger in size are typically priced per tonne, based upon the specifications required and the supply conditions.
Please provide your desired dimensions, grades, length number, and end for a current quote including the lead time applicable and details for certification.
Pricing
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Why Choose Us
Euro Steel Bars is an international distributor, stockist and exporter of stainless round steel bars that cover carbon, stainless alloy, special grades. We stock a variety of sizes and grades. We guarantee every order with mill test certificates as well as full quality-assurance documentation. Our name speaks to our roots: European-sourced materials that is backed by the certificates and rigor that buyers from Asia as well as the Gulf and Africa are looking for.
Each bar we deliver is accompanied by EN 10204 3.1 mill test certificates as well as complete documentation of quality, so what you receive corresponds to what’s written in the documents. We carry a selection of sizes and grades ready for transport, and cut length upon the request of customers, which results in quicker lead times, whether you’re ordering just a one-off spec or a complete project tonnage.
We operate an actual wholesale business that is that is supported with an internationally-operated supply chain therefore we are able to serve fabricators sourcing one grade the same way in the same way as an EPC contractor who is placing a large order. Our clients include manufacturers, fabricators EPC construction companies, engineers oil and gas projects as well as construction companies. we design our inventory as well as documentation to show what buyers need to bring projects forward.
Our customers trust us across Qatar, Oman, Bahrain, Kuwait, Jordan, Malaysia, Singapore, Thailand, Taiwan, Turkey, Italy and South Africa. If you’re looking to source an Gulf energy project, or a construction project within Southeast Asia, you get the same quality of certified material, the exact documentation, and the exact delivery procedure.
Frequently Asked Questions
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