Hastelloy C22 Round Bar
➡️ Alloy C22 | UNS N06022 | EN 2.4602
➡️ 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:
N06022
Wr. No.:
2.4602
MTC Available:
EN 10204 3.1
Product Description for Hastelloy C22 Round Bar
Hastelloy C22 is a nickel-chromium-molybdenum alloy with tungsten, UNS N06022 and Werkstoff 2.4602. Bar is supplied to ASTM B574 with ASME SB-574 for pressure equipment.
It is the oxidising-side counterpart to C276. Chromium runs higher at 20.0-22.5% and molybdenum lower at 12.5-14.5%, with 2.5-3.5% tungsten. That shift in balance gives markedly better performance in oxidising conditions such as nitric acid, ferric chloride, cupric chloride and wet chlorine, while retaining strong resistance in reducing conditions, though less than C276 manages.
The pitting resistance equivalent lands around 65, and the alloy resists chloride pitting, crevice corrosion and stress corrosion cracking in severe mixed-acid service.
Like C276, carbon is held very low at 0.015% maximum and silicon at 0.08% maximum, so the material can be welded and used as welded without post-weld solution treatment. C22 is often described as having better weld-region corrosion resistance than C276 in oxidising media, and it is frequently chosen where a process stream changes character.
Bar is supplied solution annealed and rapidly quenched. The alloy is solid-solution strengthened only.
For wet corrosion service, prolonged exposure above roughly 650 C should be avoided because of intermetallic precipitation.
Choosing between C22 and C276 comes down to where the service sits. Neither is generally superior, and where a stream shifts between oxidising and reducing character, C22 covers more ground.
Sizes run 6 mm to 250 mm, in random or cut lengths. The alloy is non-magnetic and machining is difficult, with very high work hardening rates.
Typical work is mixed-acid chemical plant, flue-gas desulphurisation, pickling equipment, pharmaceutical reactors and waste treatment hardware.
Common Applications of Hastelloy C22 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 C22 Round Bar
Standard
Country / Region
Grade
ASTM B574
USA
UNS N06022 (rod)
ASME SB-574
USA
UNS N06022
ASTM B564
USA
UNS N06022 (forgings)
DIN 17744
Europe / EU
2.4602 (NiCr21Mo14W)
Technical Specification for Hastelloy C22 Round Bar
Specification
Value
Unit
Material
Nickel alloy
-
Grade
Hastelloy C22 / UNS N06022 / 2.4602
-
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
8.69 (typical)
g/cm3
Melting Range
1357 - 1399 (typical)
C
Thermal Conductivity at 20 C
10.1 (typical)
W/m.K
Coefficient of Thermal Expansion (20-100 C)
12.4 (typical)
um/m.C
Specific Heat (0-100 C)
414 (typical)
J/kg.K
Electrical Resistivity at 20 C
1.14 (typical)
uOhm.m
Modulus of Elasticity at 20 C
206 (typical)
GPa
Magnetic Properties
Non-magnetic
-
Pitting Resistance Equivalent (PREN)
Approximately 65 (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 C22 Round Bar
Order to ASTM B574 under UNS N06022, 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, and the quench rate matters for the same reason it does in C276: high molybdenum and tungsten make intermetallic precipitation easy if cooling through the intermediate range is slow.
Choosing between C22 and C276 comes down to where the service sits on the corrosion map. C22 has more chromium and less molybdenum, which favours oxidising conditions such as nitric acid, ferric and cupric chloride and wet chlorine. C276 has more molybdenum and less chromium, which favours reducing conditions such as hydrochloric acid. Neither is generally superior. Where a process stream shifts between oxidising and reducing character, or where the exact condition is uncertain, C22 is often the safer choice because it covers more ground overall.
Carbon at 0.015% maximum and silicon at 0.08% maximum allow use in the as-welded condition without post-weld solution treatment.
For wet corrosion service, avoid prolonged exposure above roughly 650 C. Machining is difficult, with very high work hardening rates requiring rigid setups and positive feeds.
Chemical Composition for Hastelloy C22 Round Bar
Element
Symbol
Min
Max
Unit
Nickel
Ni
Balance
-
%
Chromium
Cr
20.00
22.50
%
Molybdenum
Mo
12.50
14.50
%
Iron
Fe
2.00
6.00
%
Tungsten
W
2.50
3.50
%
Cobalt
Co
-
2.50
%
Vanadium
V
-
0.35
%
Manganese
Mn
-
0.50
%
Carbon
C
-
0.015
%
Silicon
Si
-
0.08
%
Phosphorus
P
-
0.02
%
Sulfur
S
-
0.02
%
Chemical Composition
View the chemical composition and applicable material limits for Alloy C22 Round Bar
Chromium at 20.00-22.50% is the element that sets C22 apart from C276, where it runs 14.50-16.50%. That extra chromium strengthens the passive film in oxidising conditions, giving markedly better resistance in nitric acid, ferric and cupric chloride and wet chlorine, all environments where a high-molybdenum, lower-chromium alloy struggles.
Molybdenum at 12.50-14.50% is correspondingly lower than in C276 but still very high by any general standard. It provides resistance in reducing conditions such as hydrochloric acid and contributes heavily to the pitting resistance equivalent of roughly 65.
Tungsten at 2.50-3.50% behaves like molybdenum, reinforcing resistance to localised attack in both regimes.
The trade between chromium and molybdenum is the whole story of choosing between C22 and C276, and neither composition is better in the abstract. Each covers one side of the corrosion map more strongly.
Carbon at 0.015% maximum and silicon at 0.08% maximum prevent grain boundary precipitation during welding, which is what allows use in the as-welded condition.
Iron at 2.00-6.00% and cobalt up to 2.50% are controlled constituents, with nickel forming the balance and providing the matrix and chloride stress corrosion cracking resistance.
Mechanical Properties for Hastelloy C22 Round Bar
Mechanical Property
Value
Unit
Tensile Strength, solution annealed
690
MPa (minimum)
Yield Strength 0.2% Proof, solution annealed
310
MPa (minimum)
Elongation in 50 mm, solution annealed
45
% (minimum)
Modulus of Elasticity
206
GPa (typical)
Mechanical Properties
Check the key mechanical properties and performance requirements of Alloy C22 Round Bar
ASTM B574 sets these for solution-annealed UNS N06022 bar, all minima. Testing follows ASTM E8 or ASTM A370.
At 690 MPa minimum tensile and 310 MPa minimum proof strength, the alloy is slightly stronger in proof strength than C276 while requiring higher elongation at 45% minimum. Neither difference is a reason to select one over the other, since both are bought for corrosion resistance rather than mechanical performance, and the mechanical requirements largely serve to confirm the material was properly solution annealed.
Ductility is very high and toughness holds down to cryogenic temperatures, with no ductile-to-brittle transition in the fully austenitic solid-solution structure.
The alloy is solid-solution strengthened with no precipitation-hardening response, so heat treatment cannot raise strength and cold work is the only route.
For acceptance, ASTM G28 Method A intergranular corrosion testing is far more informative than the tensile results. It confirms that the solution anneal dissolved intermetallic phases and that the quench was fast enough. Material can pass tensile testing comfortably while carrying intermetallic precipitation that would show up immediately in a G28 test and would cost corrosion performance in service.
Dimension / Sizes for Hastelloy C22 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 C22 Round Bar
Pricing for Hastelloy C22 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 C22 Round Bar?
What is the difference between C22 and C276?
Which should I choose, C22 or C276?
What standard does Hastelloy C22 Round Bar comply with?
What are the key mechanical properties of Hastelloy C22 Round Bar?
Can Hastelloy C22 be welded?
What temperature limit applies to Hastelloy C22?
What sizes and lengths are available?
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