Hastelloy Hex Bars: Ultimate Defense Against Extreme Corrosion in Industrial Environments

In a major sulfuric acid plant, standard Inconel components rapidly pitted and failed under hot contaminated conditions, causing millions in unplanned shutdowns and exposing the limits of lesser alloys. Hastelloy hex bars, with their superior resistance to mixed acids and chlorides, prevented recurrence and restored operational reliability.

Specifications and Standards

Hastelloy hex bars, especially C276, meet ASTM B574/ASME SB574, UNS N10276, DIN/WNr 2.4819, EN NiMo16Cr15W. C22 is UNS N06022/DIN 2.4602, B2 UNS N10665/DIN 2.4617. Sizes span 6mm to 100mm across flats, lengths to 6m, in hot-rolled, annealed, or machined finishes.

ISO 9001-certified with MTRs, ultrasonic testing, and PMI ensure export compliance for global procurement.

Specifications by Grade – Rod and bar

A specification is written for a product form. The standards below are the ones that cover rod and bar; the plate, bar and tube specifications for these grades are different documents and are listed on their own pages.

Grade	UNS	Rod and bar specification
B-2	N10665	ASTM B335
C-4	N06455	ASTM B574
C-22	N06022	ASTM B574
C-276	N10276	ASTM B574
C-2000	N06200	ASTM B574
G-30	N06030	ASTM B581
N	N10003	ASTM B573 / AMS 5771
X	N06002	ASTM B572 / AMS 5754

Equivalent Grades

Key equivalents: Hastelloy C276 (UNS N10276, DIN 2.4819, EN NiMo16Cr15W), C22 (UNS N06022, 2.4602, NiCr21Mo14W), B2 (UNS N10665, 2.4617). Others include JIS NW 0276, BS NA 45.

Product Forms and Availability

Hex bars available from 1/4" to 4" A/F, weights 0.018 lb/ft up, in straight lengths or custom cuts. Complements include rounds, squares, flats for fabrication.

For marine needs, Monel hex bars provide a cost-effective alternative in seawater.

Chemical Composition

Hastelloy C276: Ni balance (57%), Cr 14.5-16.5%, Mo 15-17%, Fe 4-7%, W 3-4.5%, C 0.01% max, Mn 1% max. High Mo/W boost resistance to reducing acids.

Mechanical and Physical Properties

C276 properties: tensile 690-790 MPa, yield 283-355 MPa, elongation 40% min, hardness ~100 HB, density 8.89 g/cm³, melting 1370°C. Excellent pitting/crevice resistance up to 1040°C.

C22 offers similar strength with enhanced weldability; B2 excels in HCl resistance.

Applications by Industry

Chemical Processing

Hastelloy hex bars build reactors, pumps for H2SO4, HCl, outperforming SS/Inconel in wet chlorides. Used in 70% of flue-gas desulfurization systems.

Oil & Gas

Sour gas components like fasteners resist H2S/acids, extending life 4x over carbon steel.

Marine

Scrubbers, desalination resist chlorides/seawater better than Cu-Ni alloys.

Pharma

Sterile vessels for aggressive cleaners, FDA-compliant purity.

Power Generation

Heat exchangers in FGD plants handle SOx emissions.

OEM, Fabricators, Supply Stores

Machinable for custom parts, weldable without post-weld heat treat.

Hastelloy vs. Common Alternatives

Property	Hastelloy C276	Inconel 625	Monel 400	316 SS
Tensile (MPa)	690-790	827	480-620	515-690
Reducing Acid Resistance	Excellent	Good	Poor	Poor
Oxidizing Acid	Good	Excellent	Fair	Moderate
Max Temp (°C)	1040	982	480	870

Hastelloy dominates wet chlorides/mixed acids; Inconel for high-heat oxidation.

FAQ

Hastelloy C276 hex bars follow ASTM B574/ASME SB574, UNS N10276, DIN 2.4819, EN NiMo16Cr15W. C22: UNS N06022/DIN 2.4602; B2: N10665/2.4617. Full MTRs and NDT ensure compliance for chemical, pharma, power exports. (52 words)

Hastelloy C276 hex bars: tensile 690-790 MPa, yield 283 MPa min, 40% elongation, density 8.89 g/cm³, melting 1370°C. Superior pitting/crevice resistance in chlorides, acids, up to 1040°C oxidizing atmospheres. Ideal for severe corrosion. (54 words)

Hastelloy hex bars resist H2SO4, HCl, wet chlorides in reactors/pumps, outperforming Inconel/SS. Used in 70% FGD scrubbers, digesters; prevents pitting in contaminated acids, extending life in harsh chemical flows.

Hastelloy C276 excels in reducing acids/chlorides via high Mo/W; Inconel 625 better for oxidizing/high-temp via Cr. Hastelloy resists wet Cl2, hypochlorite; both weldable, but Hastelloy for chemical process extremes. (47 words)

Yes, with ASTM/DIN/EN compliance, MTRs, ultrasonic/PMI testing, ISO certs. Mumbai suppliers ship globally for oil/gas, pharma, power; fully traceable for OEM/fabricator needs.

Global Export Destinations

We ship worldwide from Mumbai. See every destination we export to on our export markets page.

Domestic Supply Network

We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.

Conclusion

Backed by rigorous standards, advanced testing, and unmatched versatility in corrosive extremes, Hastelloy hex bars instill confidence for procurement heads and fabricators seeking durable solutions. Ready to specify Hastelloy for your critical application?