Nitronic 60 Round Bar
➡️ UNS S21800 | Alloy 218 | Fermonic 60® | N60 Round Bar
➡️ 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:
S21800
Wr. No.:
-
MTC Available:
EN 10204 3.1
Product Description for Nitronic 60 Round Bar
Nitronic 60 round bar is a nitrogen-and-manganese-strengthened austenitic stainless steel bar product supplied under UNS S21800, also referenced as Alloy 218. “Nitronic 60” is a registered trademark of Cleveland-Cliffs (formerly AK Steel/Armco); the same UNS S21800 chemistry is also sold under alternative producer trade names such as Fermonic 60.
The defining characteristic of this alloy is its high silicon (3.5–4.5%) and manganese (7.0–9.0%) content, combined with controlled nitrogen (0.08–0.18%). This combination gives Nitronic 60 outstanding, well-documented resistance to galling, wear, and fretting properties not typical of conventional austenitic stainless steels while producing a room-temperature yield strength nearly double that of Types 304 and 316.
General corrosion resistance falls between Type 304 and Type 316: better than Type 304 in most media (per producer laboratory corrosion data), though not quite as good as Type 316 overall; however, chloride pitting resistance, stress-corrosion-cracking resistance, and crevice-corrosion resistance are reported as superior to Type 316 under laboratory test conditions.
The alloy is fully austenitic and non-magnetic (permeability ~1.003 annealed), and it provides oxidation resistance far superior to Types 304/316 and approximately equal to Type 309, along with good low-temperature impact toughness down to -196°C, making it suitable for cryogenic unlubricated metal-on-metal wear applications.
Round bar is supplied in the hot-worked and annealed condition (1066°C/1950°F, water quenched) as standard; the alloy is not hardenable by heat treatment, so higher strength levels are obtained only through cold working or by specifying a separately available High-Strength (HS), hot-worked, non-annealed condition. Cold working increases strength substantially but does not meaningfully improve the galling/wear resistance already inherent to the annealed material’s chemistry.
Typical applications exploit the alloy’s galling resistance: valve stems, seats and trim, fastening systems (nuts and bolts), chain-drive systems, pins, bushings, roller bearings, wear rings, and pump components.
Industries served include oil field and petrochemical processing, food and drug processing, aerospace (including NASA spacesuit life-support hardware), and general chemical processing. Buyers should confirm the delivery condition (annealed vs. cold-worked/HS) and applicable product standard (A276 for bar, A479 for bar for pressure equipment) when specifying, since mechanical and corrosion properties differ meaningfully between conditions.
Common Applications of Nitronic 60 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 N60 Round Bar
Standard
Country / Region
Grade
ASTM / AISI / SAE / UNS
USA
UNS S21800, per ASTM A276, A314, A479; also referenced in ASTM A193/A194 (Grade B8S/8S bolting/nuts), A351/A743 (Grade CF10SMnN castings), AMS 5848
JIS
Japan
-
EN
Europe
-
BS
United Kingdom
No direct BS designation; UK suppliers specify by UNS S21800 / ASTM A276
Technical Specification for Nitronic 60 Round Bar
Specification
Value
Unit
Material
Nitrogen/silicon/manganese-alloyed austenitic stainless steel
-
Grade
UNS S21800 (Alloy 218)
-
Standard
ASTM A276 (bar/shapes), A314 (billets/bars for forging), A479 (bar for pressure vessels), A580 (wire); related forms: A193 Gr. B8S (bolting), A194 Gr. 8S (nuts), A351/A743 Gr. CF10SMnN (castings), AMS 5848 (bars/forgings/extrusions/tubing/rings)
-
Product Form
Round bar
-
Diameter
Depends on mill/stockist range
mm
Length
Standard mill lengths or cut-to-size
mm / m
Manufacturing Process
Hot rolled or hot forged, then solution annealed; High-Strength (HS), hot-worked non-annealed condition available on request (rotary-forge special practice)
-
Surface Finish
Black hot-rolled, turned, ground, or polished (per order)
-
Heat Treatment
Solution annealed at 1066°C (1950°F), water quenched; not hardenable by heat treatment
-
Delivery Condition
Annealed (standard); cold-worked or High-Strength (hot-worked, non-annealed) condition available 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
7.622 (24°C)
g/cm³
Magnetic Properties
Non-magnetic; permeability ~1.003 annealed, rising to ~1.010 after 75% cold reduction (per producer test data)
-
Corrosion Resistance
Between Type 304 and Type 316 in general media; better chloride pitting, crevice, and stress-corrosion-cracking resistance than Type 316 in laboratory testing
-
Thermal Conductivity
Not stated in the producer's product data bulletin. Secondary distributor data (Double Eagle Alloys) cite ~9.0 Btu/(ft·hr·°F) (~15.6 W/(m·K)) — not independently confirmed by the primary source
W/(m·K)
Electrical Resistivity / Conductivity
98.2
microhm-cm
Coefficient of Thermal Expansion
15.8 (24–93°C), rising to 19.8 (24–982°C)
µm/(m·K)
Melting Range
Liquidus 1391 / Solidus 1352
°C
Modulus of Elasticity
180 (room temperature)
GPa
Poisson's Ratio
0.298
-
Technical Specifications
Get the key technical specifications for Nitronic 60 Round Bar
Nitronic 60 round bar is identified by UNS S21800 and is referenced in ASTM A276 (bar and shapes), ASTM A314 (billets and bars for forging), and ASTM A479 (bar for boilers and pressure vessels), with fastener stock covered under ASTM A193 Grade B8S and A194 Grade 8S, and aerospace-quality material under AMS 5848. Standard delivery is hot-worked and solution-annealed at 1066°C (1950°F) followed by water quenching; because the alloy is not hardenable by heat treatment, any increase in strength above the annealed minimums requires either cold working or the separately available High-Strength (HS) hot-worked, non-annealed condition (produced by special rotary-forging practice, generally available 63.5–152 mm diameter).
Cold working and the HS condition do not further improve the galling/wear resistance already present in the annealed state, and HS material’s aqueous corrosion resistance may be somewhat reduced. General dimensional tolerances, straightness, and surface finish follow standard stainless round-bar practice under ASTM A484 unless the buyer specifies tighter requirements.
Carbon Equivalent (CEV) does not apply to this fully austenitic grade. Note that Nitronic 60 is a patented alloy: non-licensed foundries must obtain Cleveland-Cliffs-produced remelt stock to produce castings. Buyers should confirm melt practice, delivery condition, and hardness with the supplying mill, as these affect both mechanical properties and price.
Chemical Composition for Nitronic 60 Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
-
0.10
-
Chromium
Cr
16.00
18.00
-
Nickel
Ni
8.00
9.00
-
Manganese
Mn
7.00
9.00
-
Silicon
Si
3.50
4.50
-
Phosphorus
P
-
0.040
-
Sulfur
S
-
0.030
-
Nitrogen
N
0.08
0.18
-
Iron
Fe
Balance
Balance
-
Chemical Composition
View the chemical composition and applicable material limits for N60 Round Bar
Nitronic 60’s composition is distinguished by unusually high silicon (3.5–4.5%) and manganese (7.0–9.0%) content compared to conventional austenitic stainless steels, which typically contain silicon below 1% and manganese below 2%.
This elevated silicon content is the primary driver of the alloy’s galling and wear resistance: producer testing shows Nitronic 60 relies on a thin, adherent oxide film supported by a high strain-hardening capacity to resist metal-to-metal wear, and it substantially outperforms Types 304, 316, and even several martensitic and cobalt-base alloys in crossed-cylinder wear and galling tests.
Manganese, alongside nitrogen (0.08–0.18%), stabilizes the austenitic structure, increases nitrogen solubility during melting, and contributes solid-solution strengthening, producing a room-temperature yield strength nearly double that of Types 304/316.
Chromium (16.0–18.0%) is at the lower end of the typical austenitic range, and the alloy contains no intentional molybdenum addition, which is consistent with its general pitting corrosion resistance sitting between Type 304 and Type 316 rather than exceeding 316 outright in bulk media although chloride pitting resistance, crevice corrosion resistance, and stress-corrosion-cracking resistance have each been documented as superior to Type 316 under specific laboratory test conditions (per producer ferric chloride and boiling MgCl₂ test data).
Low carbon (0.10% max) helps limit sensitization risk during welding or elevated-temperature service. The composition also supports oxidation resistance far superior to Types 304/316 and approximately equal to Type 309, making the alloy suitable for elevated-temperature sliding-contact components in addition to its primary galling-resistance role.
Mechanical Properties for Nitronic 60 Round Bar
Mechanical Property
Value
Unit
Tensile Strength (min)
655 (95) - 724 (105)
MPa (ksi)
Yield Strength, 0.2% Offset (min)
345 (50) - 379 (55)
MPa (ksi)
Elongation (min)
35
%
Reduction of Area (min)
55
%
Hardness (min)
85
HRB
Mechanical Properties
Check the key mechanical properties and performance requirements of N60 Round Bar
In the annealed condition, minimum yield strength of 345–379 MPa (depending on diameter) is nearly double the annealed minimum yield strength of Types 304/316, allowing components such as pins, bushings, and valve trim to carry higher loads at reduced cross-section while retaining the alloy’s characteristic galling resistance.
The 35% minimum elongation and 55% minimum reduction of area indicate good ductility for an alloy of this strength level, and producer low-temperature test data confirm this ductility and toughness are well retained down to -196°C, with Charpy V-notch impact values remaining well above 150 J even at cryogenic temperatures in the annealed condition supporting use in unlubricated cryogenic wear applications.
Because Nitronic 60 is not hardenable by heat treatment, cold working or the separately specified High-Strength condition are the only routes to strength levels above the annealed minimums; cold working can raise yield strength substantially (producer data show 0.2% YS exceeding 1200 MPa at 60% cold reduction) but reduces elongation and does not meaningfully improve the galling/wear resistance already inherent to the annealed material’s chemistry.
The alloy’s oxidation resistance, approximately equal to Type 309 and far superior to Types 304/316, extends its usefulness into elevated-temperature sliding-contact applications, such as valve trim operating up to roughly 750°C in documented field service.
Dimension / Sizes for Nitronic 60 Round Bar
Dimension / Size
Value
Unit
Diameter
Depends on mill/stockist manufacturing range; HS condition (rotary-forge special practice) generally available 63.5–152 mm — 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 N60 Round Bar
Pricing for Nitronic 60 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
Get current Nitronic 60 Round Bar pricing based on size, quantity, grade, finish, and delivery requirements.
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
What is Nitronic 60 round bar?
What standard does it comply with?
What sizes are available?
What is its heat-treatment/delivery condition?
Is Nitronic 60 suitable for welding?
What is its corrosion resistance compared to 304 and 316?
Can custom sizes or lengths be supplied?
What is the difference between Nitronic 60 and Nitronic 50?
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