Hastelloy C276 Round Bar
➡️ Alloy C276 | UNS N10276 | EN 2.4819
➡️ ASTM, EN, JIS & International Standards
➡️ Supply Conditions
➡️ Multiple Diameters & Supply Lengths
➡️ Global Export & International Delivery
Country of Origin:
Europe, Japan, USA
Material Type:
Nickel Alloy
UNS Number:
N10276
Wr. No.:
2.4819
MTC Available:
EN 10204 3.1
Product Description for Hastelloy C276 Round Bar
Hastelloy C276 is a nickel-molybdenum-chromium alloy with tungsten, UNS N10276 and Werkstoff 2.4819. Stock is supplied to ASTM B574 with ASME SB-574 for pressure equipment.
It is among the most universally corrosion-resistant materials available. Molybdenum at 15-17% handles reducing conditions including hydrochloric and sulphuric acid, chromium at 14.5-16.5% covers oxidising conditions, and tungsten at 3-4.5% reinforces both. The pitting resistance equivalent lands near 68, far above any stainless or duplex grade, and the alloy resists chloride pitting, crevice corrosion and stress corrosion cracking in severe service.
What made C276 the industry standard rather than earlier Hastelloy C is the residual control. Carbon is capped at 0.010% and silicon at 0.08%, both extraordinarily low, and that is what allows the alloy to be welded and used in the as-welded condition without a post-weld solution treatment. Earlier versions required solution annealing after welding, which is impractical on site.
Bar is supplied solution annealed. The alloy is solid-solution strengthened with no hardening heat treatment.
For wet corrosion service, exposure above roughly 650 C should be avoided, since intermetallic precipitation reduces corrosion resistance even though oxidation resistance extends far higher.
ASTM G28 Method A testing is the usual supplementary requirement, and machining is difficult because the alloy work hardens very rapidly, so rigid setups and positive feeds are needed.
Diameters run 6 mm to 250 mm, random length or cut to order. The alloy is non-magnetic.
Typical work is flue-gas desulphurisation, chemical process reactors, pulp bleaching, acid plant hardware, sour gas service and pollution control equipment.
Common Applications of Hastelloy C276 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 Alloy C276 Round Bar
Standard
Country / Region
Grade
ASTM B574
USA
UNS N10276 (rod)
ASME SB-574
USA
UNS N10276
ASTM B564
USA
UNS N10276 (forgings)
DIN 17744
Europe / EU
2.4819 (NiMo16Cr15W)
Technical Specification for Hastelloy C276 Round Bar
Specification
Value
Unit
Material
Nickel alloy
-
Grade
Hastelloy C276 / UNS N10276 / 2.4819
-
Product Form
Round bar / rod
-
Standard
ASTM B574, ASME SB-574
-
Diameter
6 - 250 (typical supply range)
mm
Length
3 - 6 (random), or cut to length
m
Manufacturing Process
Hot rolled or forged, solution annealed
-
Production Route
EAF + AOD with VIM or ESR remelt where specified
-
Surface Finish
Hot-rolled and pickled, peeled, turned, centreless ground, polished
-
Heat Treatment / Delivery Condition
Solution annealed and rapidly quenched
-
Tolerance Standard
ASTM B574 permissible variations
-
Density
8.89 (typical)
g/cm3
Melting Range
1325 - 1370 (typical)
C
Thermal Conductivity at 20 C
10.2 (typical)
W/m.K
Coefficient of Thermal Expansion (20-100 C)
11.2 (typical)
um/m.C
Specific Heat (0-100 C)
427 (typical)
J/kg.K
Electrical Resistivity at 20 C
1.30 (typical)
uOhm.m
Modulus of Elasticity at 20 C
205 (typical)
GPa
Magnetic Properties
Non-magnetic
-
Pitting Resistance Equivalent (PREN)
Approximately 68 (typical, calculated)
-
Maximum Service Temperature
650 for wet corrosion service, higher for oxidation only
C
Testing / Inspection Standard
ASTM E8 or ASTM A370 for mechanical testing, ASTM G28 Method A for intergranular corrosion
-
Certification / Inspection Documents
EN 10204 3.1 or 3.2 mill test certificate, NACE MR0175 compliance on request
-
Technical Specifications
Get the key technical specifications for Hastelloy C276 Round Bar
Supply runs to ASTM B574 under UNS N10276, with ASME SB-574 for pressure-retaining components and ASTM B564 for forgings. Dimensional tolerances come from the permissible variations within B574.
Delivery is solution annealed with rapid quenching. The quench matters because the very high molybdenum and tungsten content makes intermetallic precipitation easy if cooling through the intermediate range is slow, and any such precipitation reduces both toughness and corrosion resistance.
The extremely low carbon and silicon limits are the alloy’s defining process feature. At 0.010% carbon maximum and 0.08% silicon maximum, both far below normal alloy practice, the material can be welded and placed in service as welded without a post-weld solution treatment. Earlier Hastelloy C required solution annealing after welding, which is simply not practical for site fabrication, and removing that requirement is what made C276 the industry workhorse.
For wet corrosion service, avoid prolonged exposure above roughly 650 C. Intermetallic phases precipitate and reduce corrosion resistance, and this is not visible in mechanical testing. Oxidation resistance extends considerably higher, but that is irrelevant if the component then returns to wet service.
ASTM G28 Method A testing is the usual supplementary requirement. Machining is difficult, with very high work hardening rates.
Chemical Composition for Hastelloy C276 Round Bar
Element
Symbol
Min
Max
Unit
Nickel
Ni
Balance
-
%
Molybdenum
Mo
15.00
17.00
%
Chromium
Cr
14.50
16.50
%
Iron
Fe
4.00
7.00
%
Tungsten
W
3.00
4.50
%
Cobalt
Co
-
2.50
%
Vanadium
V
-
0.35
%
Manganese
Mn
-
1.00
%
Carbon
C
-
0.010
%
Silicon
Si
-
0.08
%
Phosphorus
P
-
0.04
%
Sulfur
S
-
0.03
%
Chemical Composition
View the chemical composition and applicable material limits for Alloy C276 Round Bar
Molybdenum at 15.00-17.00% is the highest of any alloy in common commercial use and it is what gives C276 its resistance in reducing conditions, including hydrochloric and sulphuric acid where chromium-bearing alloys fail. It is also weighted 3.3 times in the pitting resistance equivalent, driving that figure to roughly 68.
Chromium at 14.50-16.50% covers the opposite half of the corrosion map, handling oxidising conditions. The combination of very high molybdenum with useful chromium is why the alloy performs across both oxidising and reducing environments, which very few materials manage.
Tungsten at 3.00-4.50% behaves much like molybdenum, reinforcing resistance to localised attack in both regimes.
Carbon at 0.010% maximum and silicon at 0.08% maximum are the limits that define the modern alloy. Both are extraordinarily low, and both exist to prevent carbide and intermetallic precipitation at grain boundaries during welding. That is what allows the material to be used as welded, without the post-weld solution treatment that earlier Hastelloy C required.
Iron at 4.00-7.00% and cobalt up to 2.50% are controlled constituents. Nickel forms the balance, typically around 57%, providing the matrix and resistance to chloride stress corrosion cracking.
Mechanical Properties for Hastelloy C276 Round Bar
Mechanical Property
Value
Unit
Tensile Strength, solution annealed
690
MPa (minimum)
Yield Strength 0.2% Proof, solution annealed
283
MPa (minimum)
Elongation in 50 mm, solution annealed
40
% (minimum)
Modulus of Elasticity
205
GPa (typical)
Mechanical Properties
Check the key mechanical properties and performance requirements of Alloy C276 Round Bar
These are ASTM B574 requirements for solution-annealed UNS N10276 bar, all minima. Testing follows ASTM E8 or ASTM A370.
At 690 MPa minimum tensile plus 283 MPa minimum proof strength the alloy is moderately strong, comparable to a nitrogen-strengthened austenitic stainless. Nobody buys C276 for its mechanical properties. It is a corrosion alloy, and the mechanical requirements exist mainly to confirm the material was properly solution annealed.
Elongation of 40% minimum is high and reflects the fully austenitic solid-solution structure. Toughness holds down to cryogenic temperatures with no ductile-to-brittle transition.
The alloy is solid-solution strengthened with no precipitation-hardening response, so heat treatment cannot increase strength and cold work is the only route.
For acceptance purposes, corrosion testing carries far more information than tensile results. ASTM G28 Method A intergranular corrosion testing confirms that the solution anneal dissolved any intermetallic phases and that the quench was fast enough, and it is worth making mandatory on the order for severe service. A heat that passes tensile testing comfortably can still have intermetallic precipitation that a G28 test would catch.
Dimension / Sizes for Hastelloy C276 Round Bar
Dimension / Size
Value
Unit
Diameter
6 - 250
mm
Standard Length
3 - 6 (random / mill lengths)
m
Custom Length
Cut to length available on request
-
Diameter Tolerance
Per ASTM B574 permissible variations, varies with size and finish
-
Length Tolerance
Per ASTM B574 or as agreed at order
-
Straightness Tolerance
Per ASTM B574 or as agreed at order
-
End Condition
Square cut, chamfered, or as ordered
-
Surface Finish
Hot-rolled and pickled, peeled, turned, centreless ground, polished
-
Available Size Range
6 - 250, larger diameters by forging on enquiry
mm
Cut-to-Length Availability
Available
-
Dimensional Standard
ASTM B574
-
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for Alloy C276 Round Bar
Pricing for Hastelloy C276 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
What is Hastelloy C276 Round Bar?
Why is C276 different from the original Hastelloy C?
What standard does Hastelloy C276 Round Bar comply with?
What are the key mechanical properties of Hastelloy C276 Round Bar?
What temperature limit applies to Hastelloy C276?
How does C276 compare with C22?
Can Hastelloy C276 be welded?
What sizes and lengths are available?
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