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Hastelloy B2 Studs Manufacturer & Exporter in India

Explore Hastelloy B2 Studs Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
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-200

Min Temp

1100

Max Temp

🌡

1100

Suitable for continuous service up to approximately 1100°C under typical operating conditions.

⚡

800

Typical tensile strength around 800 MPa depending on product form and heat treatment.

🛡

Excellent

Excellent corrosion resistance in a wide range of industrial environments.

⚖

8.9

Typical density is approximately 8.9 g/cm³.

Product Overview

What are Hastelloy B2 Studs?

Hastelloy B2 studs are nickel-molybdenum alloy fasteners manufactured from UNS N10665 bar stock conforming to ASTM B335. The alloy’s exceptionally high molybdenum content (26-30%) delivers outstanding resistance to hydrochloric acid at all concentrations and temperatures, including boiling HCl – a performance level unmatched by any stainless steel or standard nickel alloy fastener.

Hastelloy B2 studs are specified in chemical process industries where reducing acid environments, hydrogen chloride gas, and sulfuric acid at moderate concentrations demand a fastener material that will not corrode under flange bolt loads. The alloy conforms to NACE MR0175 hardness limits and is widely used in reactor closures, distillation column flanges, and acid storage vessel nozzle connections worldwide.

Quick Specifications

MaterialHastelloy B2
UNS NumberN10665
DIN Number2.4617
Material StandardASTM B335
Stud Standard (Metric)DIN 938 / DIN 939 / ISO 4032
Stud Standard (Inch)ASME B18.31.2 / ASME B16.5
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength760 MPa (110 ksi) min
Yield Strength350 MPa (51 ksi) min
HardnessMax 35 HRC / 241 HB
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Hastelloy B2 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Hastelloy B2 fastener range from certified nickel-molybdenum-chromium superalloy bar stock, including Hastelloy B2 Bolts, Hastelloy B2 Nuts, Hastelloy B2 Screws, Hastelloy B2 Washers, and Hastelloy B2 Threaded Rods. All Hastelloy B2 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Hastelloy B2 Bolts
Hastelloy B2 Nuts
Hastelloy B2 Screws
Hastelloy B2 Washers
Hastelloy B2 Threaded Rods

Technical Data

Hastelloy B2 Studs Dimensions, Sizes & Thread Standards

Hastelloy B2 Studs are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 938 (one-end stud) / DIN 939 (stud bolt) / ASME B16.5 (flange stud bolts). Custom lengths in 5mm increments. Inch dimensions available per ASME B18.31.2. All Hastelloy B2 studs dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Stud Bolt Dimensions - Metric (DIN 938 / DIN 939)

Size (M)Pitch (mm)Shank Dia (mm)Thread Length (mm)Min L (mm)Max L (mm)
M61.06.01820200
M81.258.02225250
M101.510.02630300
M121.7512.03035400
M162.016.03845500
M202.520.04655600
M243.024.05465700
M303.530.06680800
M364.036.0781001000
M424.542.0901201200
M485.048.01021401500
M565.556.01181601800
M646.064.01341802000
M726.072.01502002000
M806.080.01662202500
M1006.0100.02002503000

Dimensional & Material Standards

StandardCoversThread
DIN 938Studs, one-end engagementMetric
DIN 939Studs, both-end engagementMetric
ISO 4032Hex nuts for studsMetric
ASME B18.31.2Continuous thread studsUNC/UNF
ASME B16.5Stud bolts for flangesUNC
MSS SP-75Stud bolts, high-pressureUNC
ASME B16.47Large diameter flange studsUNC
Material StandardRequirement
ASTM B335Bar/rod - UNS N10665
ASTM F468Fastener mechanical properties
NACE MR0175Sour service =35 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Hastelloy B2 Chemical Composition

Hastelloy B2 Studs derive their exceptional acid corrosion resistance from a precisely controlled nickel-molybdenum-chromium composition per ASTM. High molybdenum and tungsten content suppresses pitting and reducing-acid attack; ultra-low carbon (0.01% max) eliminates sensitization risk in welded assemblies. Full elemental composition is certified in the EN 10204 MTC supplied with every Hastelloy B2 studs order from RealBolt.

Chemical Composition per ASTM B335

ElementComposition (%)
Nickel (Ni)Balance (min 65%)
Molybdenum (Mo)26.0-30.0%
Iron (Fe)2.0% max
Chromium (Cr)1.0% max
Carbon (C)0.02% max
Manganese (Mn)1.0% max
Silicon (Si)0.10% max
Cobalt (Co)1.0% max
Phosphorus (P)0.04% max
Sulfur (S)0.03% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Hastelloy B2 Alloy Composition Matters for Studs

Mo (26–30%) — Reducing Acid Resistance
The exceptionally high molybdenum content is the defining characteristic of Hastelloy B2. It provides outstanding resistance to hydrochloric acid at all concentrations and temperatures, including boiling HCl — the most aggressive reducing acid environment encountered in chemical processing. Stud threads remain intact where stainless steel would dissolve within hours.
Ultra-Low Carbon (0.02% max) — Grain Boundary Stability
The very low carbon ceiling in B2 compared to its predecessor Hastelloy B virtually eliminates carbide precipitation at grain boundaries during fabrication and welding. This means stud assemblies welded into reactor nozzles retain full corrosion resistance in the heat-affected zone without mandatory post-weld heat treatment.
Low Iron and Chromium — Reducing Environment Optimisation
Unlike oxidising-environment alloys, Hastelloy B2 deliberately minimises iron and chromium to avoid sensitisation in reducing acid service. The near-pure Ni-Mo matrix resists hydrogen embrittlement and stress corrosion cracking under sustained bolt preload in HCl and H2SO4 process streams.

Fastener Performance

Hastelloy B2 Studs Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Hastelloy B2 Studs per ASTM. Hastelloy B2 studs achieve 800 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Tightening Torque Reference - Hastelloy B2 Studs

Stud SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12826630
M1619815872
M20395316115
M24685548167
M3013701096265
M3623801904385
M4238003040530
M4856404512698
?? Anti-galling: Use nickel-based anti-seize (Molykote P-37 or equivalent). Lubricated values assume K=0.15. Never use copper-based anti-seize on nickel alloys - galvanic corrosion risk in acid service.

Industry Applications

Hastelloy B2 Studs Applications — Industries & End Uses

Hastelloy B2 Studs from RealBolt are specified across chemical processing, pharmaceutical, oil and gas, and FGD where excellent corrosion resistance and 800 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples. Select an industry below to see specific Hastelloy B2 studs application details and RealBolt stock availability.
Hastelloy B2 stud bolt sets are the standard specification for reactor closure flanges, column nozzle connections, and heat exchanger channel covers in hydrochloric acid production and handling facilities. The alloy withstands boiling HCl at all concentrations where no other commercially available fastener material survives without rapid corrosion.
Flange stud sets for sulfuric acid alkylation units, acetic acid reactors, phosphoric acid digesters, and mixed reducing acid process vessels. Hastelloy B2 studs are specified where process streams contain HCl, H2SO4 at moderate concentrations, or hydrogen chloride gas at elevated temperatures that would rapidly attack stainless steel or Hastelloy C276 fasteners.
Stud bolt assemblies for pharmaceutical reactor vessels, solvent recovery columns, and API synthesis equipment operating in reducing acid environments. The ultra-low carbon content of B2 ensures no contamination risk from carbide precipitation and supports CIP/SIP cleaning cycles with acidic wash solutions without fastener degradation.
Hastelloy B2 studs are used in chlorine dioxide bleaching equipment, HCl wash stage vessels, and acidic filtrate handling systems in kraft pulp mills. The alloy’s resistance to reducing chloride environments makes it the preferred fastener material for bleach plant flange connections where chlorine-bearing reducing conditions prevail.

Hastelloy B2 Studs Standards & International Certifications

Hastelloy B2 Studs from RealBolt Engineering Industries are manufactured to internationally recognised fastener dimensional standards covering thread form, tolerances, strength grades, and quality requirements. Every batch ships with EN 10204 MTC 3.1/3.2, PMI (XRF), NACE MR0175/ISO 15156, and NABL-accredited lab reports — available on request for all orders.
Standards
DIN 938 DIN 939 DIN 976-1 ASME B18.31.2 IS 1364 IS 1367
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy Hastelloy B2 Studs from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Hastelloy B2 Studs — for competitive pricing, EN 10204 MTC 3.1/3.2 documentation, and fast Mumbai dispatch. Standard sizes are ex-stock; custom dimensions accepted with 2–3 week lead time. Request your quote today.
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Answers for Buyers

Hastelloy B2 Studs — Frequently Asked Questions

Browse expert answers to common questions about Hastelloy B2 Studs from RealBolt — covering acid corrosion resistance, NACE MR0175 compliance, ASTM standards, available sizes, and MTC documentation. Contact our technical team directly for project-specific guidance on Hastelloy B2 studs selection and pricing.
Hastelloy B2 studs are manufactured to DIN 938 (one-end engagement metric studs), DIN 939 (both-end engagement metric studs), and ASME B18.31.2 for continuous thread studs in inch dimensions. Flange stud bolt sets for ASME B16.5 Class 150 to Class 2500 flanges are supplied per ASME B16.5 with matching heavy hex nuts. Custom thread forms including BSW, BSF, and Whitworth are available on request with a 15 working day lead time.
Yes – Hastelloy B2 (UNS N10665) is specifically engineered for hydrochloric acid service and provides outstanding resistance to HCl at all concentrations from ambient temperature up to and including boiling point. The 26-30% molybdenum content gives the alloy a corrosion rate below 0.1 mm/year in boiling concentrated HCl – a condition that destroys stainless steel and most other nickel alloys within hours. Stud assemblies in HCl reactor flanges routinely achieve 10+ year service life without replacement.
Hastelloy B3 (UNS N10675) is the successor alloy to B2 and offers improved thermal stability and resistance to stress corrosion cracking in oxidising acid contamination scenarios. B2 studs are preferred where the process stream is strictly reducing and free from oxidising contaminants such as ferric ions or dissolved oxygen. Where occasional oxidising upsets are possible, B3 studs are the safer specification. Both alloys share similar mechanical properties and dimensional standards, so B3 studs can be substituted for B2 without design changes.
Use a nickel-based anti-seize compound such as Molykote P-37, Jet-Lube KOPR-KOTE Pure Nickel, or Bostik Never-Seez Pure Nickel on all Hastelloy B2 stud threads and nut bearing faces. Apply a thin, even coat and reduce target torque by approximately 20% compared to dry assembly values. Never use copper-based or zinc-based anti-seize on nickel alloys – the galvanic potential difference accelerates corrosion at the thread interface, particularly in acid service environments.

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