ASTM B574 / ASME SB574 certified Hastelloy C276, C22, B2, B3, and C2000 stud bolts engineered for extreme chemical processing, flue gas scrubbers, and offshore sour gas service.
Zero-Defect Hastelloy Fastener Solutions
Precision thread-rolled nickel alloy studs matching ASME B16.5 high-pressure piping flanges and pressure vessel reactors.
In high-consequence processing environments where standard stainless steels, 2205 duplex, and super duplex alloys fail due to severe pitting, stress corrosion cracking (SCC), or localized attack, Hastelloy stud bolts serve as the ultimate bolting solution.
Engineered primarily from solid solution nickel-chromium-molybdenum-tungsten matrices, Hastelloy fasteners maintain structural integrity under hot mineral acids, active organic compounds, and hostile gas streams. As an ISO 9001:2015 certified manufacturer based in Mumbai, Stud Bolt India specializes in converting prime mill certified ASTM B574 / ASME SB574 bar stock into fully threaded stud bolts, double-end studs, and custom flange hardware engineered specifically for ASME B16.5 and ASME B16.47 pressure boundary connections.
Our advanced manufacturing facility utilizes precision CNC thread rolling techniques, eliminating stress concentration points inherent in cut threads. This drastically increases fatigue life under continuous thermal cycling and high-pressure pulsing conditions frequently encountered in chemical synthesis plants and sour gas processing units.
Selecting the optimal Hastelloy stud bolt grade requires matching environmental oxidants, reducing agents, operating temperatures, and clamp-load requirements. Explore our primary alloy grades below.
The global benchmark for severe chemical environments. Contains 57% Ni, 16% Mo, 15.5% Cr, and 3.7% W. Exceptional resistance to wet chlorine gas, hypochlorites, chlorine dioxide, ferric and cupric chlorides, and hot contaminated organic/inorganic media. Resists grain-boundary precipitation during welding or hot working.
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Enhanced nickel-chromium-molybdenum-tungsten alloy providing superior overall corrosion resistance in oxidizing acid streams compared to C276. Outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking in aggressive chloride-bearing aqueous environments and mixed-acid processes.
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Specifically formulated for pure reducing conditions, particularly hydrochloric acid at all concentrations and temperatures up to the boiling point. Contains ~28% Mo with negligible chromium. Hastelloy B3 offers improved thermal stability and enhanced fabrication ductility over legacy B2 alloy.
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Formulated with deliberate copper additions (~1.6%) to a Ni-Cr-Mo matrix. Provides unparalleled versatility by resisting both oxidizing media (via high Cr) and reducing acids (specifically hydrofluoric and sulfuric acids) across a broad concentration spectrum.
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High-temperature nickel-chromium-iron-molybdenum alloy engineered for exceptional oxidation resistance, thermal stress tolerance, and creep strength in gas turbine engine combustors, industrial furnaces, and high-temperature petrochemical reformer units up to 2200°F (1200°C).
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High-chromium nickel alloys designed specifically for commercial phosphoric acid manufacturing, wet-process fertilizer production, and complex nitric/hydrofluoric acid pickling baths where standard alloys experience severe intergranular corrosion.
Get a QuotePrecise metallurgical compliance and recommended torque assembly values to prevent thread galling, guarantee joint tightness, and prevent fugitive emissions under ASME B16.5 flange protocols.
| Alloy Grade | UNS Number | Tensile Strength (min) | Yield Strength 0.2% (min) | Elongation (%) | Hardness (HRB/HRC) |
|---|---|---|---|---|---|
| Hastelloy C276 | UNS N10276 | 100 ksi (690 MPa) | 45 ksi (310 MPa) | 40% | 90 HRB max |
| Hastelloy C22 | UNS N06022 | 100 ksi (690 MPa) | 45 ksi (310 MPa) | 45% | 89 HRB max |
| Hastelloy B2 | UNS N10665 | 110 ksi (760 MPa) | 51 ksi (350 MPa) | 40% | 94 HRB max |
| Hastelloy B3 | UNS N10675 | 110 ksi (760 MPa) | 51 ksi (350 MPa) | 40% | 94 HRB max |
| Hastelloy C2000 | UNS N06200 | 100 ksi (690 MPa) | 45 ksi (310 MPa) | 45% | 90 HRB max |
| Hastelloy X | UNS N06002 | 95 ksi (655 MPa) | 35 ksi (240 MPa) | 35% | 88 HRB max |
Nickel alloys such as Hastelloy C276 exhibit high friction coefficients ($K$-factor $\approx 0.18 - 0.22$ unlubricated). Under heavy clamping loads, unlubricated threads will suffer micro-fretting and severe galling, preventing complete pre-load torque transfer and causing flange leaks.
Raw Material Spec: ASTM B574 / ASME SB574 (Rod & Bar)
Thread Dimensions: ASME B18.31.2 (Continuous Thread Studs), ASME B18.2.1 (Bolts)
Nut Dimensions: ASME B18.2.2 Heavy Hex Nuts
Flange Compatibility: ASME B16.5, ASME B16.47 Series A & B, DIN EN 1092-1
Thread Pitch: UNC / UNR Class 2A for ≤ 1" dia, 8-UN Series Class 2A for > 1" dia
NACE Compliance: NACE MR0175 / ISO 15156 for Sour Oilfield Service
How emerging global energy transitions, green hydrogen infrastructure, and environmental emission mandates are shaping the demand and manufacturing specifications for Hastelloy fasteners.
As green hydrogen production accelerates globally, high-pressure water electrolyzers (PEM and Alkaline systems) demand Hastelloy C276 and C22 stud bolts due to their immunity to hydrogen embrittlement and resistance to highly concentrated alkaline electrolytes at elevated operating temperatures.
CCUS transport systems handle dense-phase super-critical $CO_2$ streams laden with moisture, hydrogen sulfide ($H_2S$), and trace acid impurities. Hastelloy fasteners are becoming the mandatory procurement standard for critical isolation valve flanges and compressor station manifolds.
High-efficiency Sea Water Reverse Osmosis (SWRO) facilities utilizing energy recovery devices (ERD) encounter extremely concentrated brine pressures up to 120 bar. Procurement trends indicate a shift towards Hastelloy C2000 and C22 studs to eliminate crevice corrosion under elastomeric seals.
Environmental EPA LDAR (Leak Detection and Repair) standards require zero-leak flange integrity. High-elasticity rolled thread Hastelloy stud bolts prevent stress relaxation and torque degradation, ensuring continuous gasket seating strain across multi-year operating campaigns.
Single-source complete bolting packages to ensure identical heat lot chemistry, uniform thermal expansion coefficients, and single-origin certification across all joint components.
Full-thread and partial-thread hex bolts manufactured to ASME B18.2.1 and DIN 931/933 standards in C276, C22, and B2.
Precision tapped ASME B18.2.2 heavy hex nuts designed to match high-load Hastelloy flange stud assemblies without galling.
High-torque Allen socket head cap screws and set screws to DIN 912 / ISO 4762 for compact chemical pumps and agitation machinery.
Heavy plain flat washers and spring lock washers engineered to ASTM B575 to ensure even load distribution across flange faces.
Continuous DIN 975/976 threaded bars supplied in 1-meter, 2-meter, or 3-meter stock lengths or custom cut-to-length sizes.
All-thread continuous stud bolts and tap-end studs sized specifically for ASME B16.5 and B16.47 pressure vessel connections.
Supplying fasteners for critical chemical reactors, high-pressure heat exchangers, and sour gas handling facilities requires absolute material verification and uncompromising manufacturing control.
At Stud Bolt India, every production order of Hastelloy stud bolts undergoes rigorous quality verification routines in our ISO 9001:2015 certified laboratory:
Optical emission spectrometry and PMI verification on incoming ASTM B574 Hastelloy bar stock.
Precision sawing and chamfering to exact ASME B18.31.2 overall length specifications.
Precision thread rolling forming uninterrupted grain flow and superior fatigue strength.
Tensile, proof load, hardness, micro-grain size, and ASTM G28 corrosion testing.
Unique heat number and alloy grade marking followed by seaworthy VCI export packaging.
Engineered for mission-critical joints where equipment failure or leakage poses environmental hazards or costly operational shutdown risks.
Hastelloy C276 studs for acetic acid reactors, vinyl chloride monomer (VCM) lines, and styrene plants.
NACE MR0175 compliant Hastelloy C22 fasteners for high H2S / CO2 deepwater wellhead equipment.
Flue Gas Desulfurization (FGD) scrubbers on marine vessels and coal power plants resisting sulfuric slurry.
Hastelloy C276 continuous thread studs resisting chlorine dioxide gas in pulp bleaching digestors.
Casing bolts and mechanical seal studs for high-concentrate acid recirculation pumps.
High-purity Hastelloy C22 studs for active pharmaceutical ingredient (API) reaction vessels.
Hastelloy X fasteners resisting extreme heat oxidation in turbine combustors and heat treating hardware.
Flange studs for toxic waste incinerator gas scrubbers dealing with hot mixed halogen acids.
Hear from lead corrosion engineers and procurement directors who rely on our certified Hastelloy fasteners.
We required custom ASTM B574 Hastelloy C276 stud bolts for a major refinery acid plant shutdown in Qatar. Stud Bolt India delivered full EN 10204 3.1 certified lots with complete PMI reports two days ahead of deadline. Flawless quality!
Finding authentic Hastelloy C22 studs with verified low-carbon chemistries for our fertilizer reactor rebuild was challenging until we engaged Stud Bolt India. Their technical documentation and rolled thread precision are second to none.
Our marine scrubber retrofit required Hastelloy C276 studs with custom Xylan coatings to maintain stable torque values. Stud Bolt India provided technical support on $K$-factor selection and supplied flawless fasteners.
Stud Bolt India is our primary vendor for exotic alloy fasteners. Their Hastelloy B3 continuous threaded studs solved our recurring HCl line flange leaks completely. Excellent customer service and fast export logistics.
In-depth technical answers to the most common questions asked by corrosion specialists, flange designers, and procurement managers searching for Hastelloy fasteners.
Share your required alloy grade (C276, C22, B2, B3, C2000), dimensional standard, diameter, length, and thread pitch. Our metallurgical engineering team will confirm pricing, delivery schedule, and MTC compliance within 24 hours.
