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Hastelloy B3 Studs Manufacturer & Exporter in India

Explore Hastelloy B3 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 B3 Studs?

Hastelloy B3 studs are nickel-molybdenum alloy fasteners machined from UNS N10675 bar stock conforming to ASTM B335. The alloy’s exceptionally high molybdenum content (28.5-31.5%) 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 B3 represents the third generation of the B-series alloys, engineered to eliminate the thermal instability issues of B and B2 by incorporating precise additions of chromium, iron, and tungsten. These refinements suppress knife-line and heat-affected zone corrosion, making B3 studs suitable for welded assemblies without post-weld heat treatment. They are specified for chemical reactor closures, acid distillation column flanges, and hydrochloric acid handling systems where joint integrity under aggressive reducing acid attack is non-negotiable.

Quick Specifications

MaterialHastelloy B3
UNS NumberN10675
DIN Number2.4600
Material StandardASTM B335
Stud Standard (Metric)DIN 976-1 / ISO 4032
Stud Standard (Inch)ASME B16.5 / ASME B18.31.2
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 B3 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Hastelloy B3 fastener range from certified nickel-molybdenum-chromium superalloy bar stock, including Hastelloy B3 Bolts, Hastelloy B3 Nuts, Hastelloy B3 Screws, Hastelloy B3 Washers, and Hastelloy B3 Threaded Rods. All Hastelloy B3 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Hastelloy B3 Bolts
Hastelloy B3 Nuts
Hastelloy B3 Screws
Hastelloy B3 Washers
Hastelloy B3 Threaded Rods

Technical Data

Hastelloy B3 Studs Dimensions, Sizes & Thread Standards

Hastelloy B3 Studs are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 976-1 (metric stud bolts) and ASME B16.5 (inch stud bolts for flanges). Custom lengths available in 5 mm increments. Inch dimensions per ASME B18.31.2. All Hastelloy B3 studs dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Stud Bolt Dimensions - Metric (DIN 976-1)

Size (M)Pitch (mm)Shank Dia (mm)Min L (mm)Max L (mm)Thread Length (mm)
M61.06.02020018
M81.258.02525022
M101.510.03030026
M121.7512.03540030
M162.016.04550038
M202.520.05560046
M243.024.06570054
M303.530.08080066
M364.036.0100100078
M424.542.0120100090
M485.048.01401200102
M565.556.01601500118
M646.064.01802000134
M726.072.02002000150
M806.080.02202500166
M1006.0100.02603000200

Dimensional & Material Standards

StandardCoversThread
DIN 976-1Stud bolts, metricMetric
ISO 4032Hex nuts, metricMetric
ASME B16.5Stud bolts for flangesUNC
ASME B18.31.2Continuous thread studsUNC/UNF
MSS SP-75High-pressure stud boltsUNC
ASME B1.1Unified inch screw threadsUNC/UNF
ISO 261Metric screw threadsMetric
Material StandardRequirement
ASTM B335Bar/rod - UNS N10675
ASTM B462Forgings - UNS N10675
ASTM F467Fastener nuts, nickel alloy
NACE MR0175Sour service =35 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Hastelloy B3 Chemical Composition

Hastelloy B3 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 B3 studs order from RealBolt.

Chemical Composition per ASTM B335

ElementComposition (%)
Nickel (Ni)Balance (min 65%)
Molybdenum (Mo)28.5-31.5%
Chromium (Cr)1.0-3.0%
Iron (Fe)3.0% max
Tungsten (W)3.0% max
Cobalt (Co)3.0% max
Carbon (C)0.01% max
Manganese (Mn)3.0% max
Silicon (Si)0.10% max
Aluminium + Titanium (Al+Ti)0.50% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Hastelloy B3 Alloy Composition Matters for Studs

Mo (28.5–31.5%) — Reducing Acid Immunity
The ultra-high molybdenum content is the defining characteristic of Hastelloy B3. It provides exceptional resistance to hydrochloric acid at all concentrations up to boiling point, as well as sulfuric, acetic, and phosphoric acids in reducing conditions — environments that rapidly attack stainless steel and lower-Mo nickel alloys.
Cr + W Additions — Thermal Stability Over B and B2
The controlled additions of chromium (1–3%) and tungsten (up to 3%) in B3 suppress the formation of Ni4Mo ordered phases that caused stress corrosion cracking in Hastelloy B and B2 during slow cooling or welding. B3 studs can be used in the as-welded condition without sensitisation risk.
Ultra-Low Carbon (0.01% max) — HAZ Protection
The extremely low carbon ceiling prevents carbide precipitation at grain boundaries during welding or elevated-temperature service. This eliminates knife-line attack in the heat-affected zone of welded flange assemblies — a critical advantage for stud bolt applications in reactor nozzle connections.

Fastener Performance

Hastelloy B3 Studs Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Hastelloy B3 Studs per ASTM. Hastelloy B3 studs achieve 800 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Indicative Tightening Torques - Hastelloy B3 Studs

Stud SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12826629
M1619515670
M20390312112
M24680544162
M3013601088258
M3623601888374
M4237603008516
M4855804464678
?? 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 B3 Studs Applications — Industries & End Uses

Hastelloy B3 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 B3 studs application details and RealBolt stock availability.
Hastelloy B3 stud bolt sets are the primary specification for flanged connections on HCl synthesis columns, acid storage tank nozzles, and pickling line piping systems. The alloy withstands HCl at all concentrations up to boiling point – conditions that destroy stainless steel and Hastelloy C276 within weeks. Supplied per ASME B16.5 Class 150-2500.
Reactor closure studs and agitator nozzle stud bolt sets in pharmaceutical API synthesis where reducing acid environments (acetic acid, formic acid, HCl) are present. B3’s ultra-low carbon content and thermal stability make it suitable for CIP (clean-in-place) and SIP (steam-in-place) cycling without sensitisation risk.
Stud bolts for heat exchanger channel covers, acid cooler flanges, and absorption tower nozzle connections in sulfuric acid concentration plants and wet-process phosphoric acid facilities. Hastelloy B3 outperforms B2 in these environments due to its improved resistance to oxidising acid impurities.
Stud bolt sets for chlorine dioxide generator flanges, bleach washer nozzle connections, and digester pressure vessel closures where reducing acid conditions and elevated temperatures combine. B3 studs replace Hastelloy B2 in new installations due to superior weldability and thermal stability.

Hastelloy B3 Studs Standards & International Certifications

Hastelloy B3 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 B3 Studs from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Hastelloy B3 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 B3 Studs — Frequently Asked Questions

Browse expert answers to common questions about Hastelloy B3 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 B3 studs selection and pricing.
Hastelloy B3 studs are available to DIN 976-1 (metric fully threaded and double-end studs), ASME B16.5 (stud bolts for flanged connections Class 150-2500), ASME B18.31.2 (continuous thread studs, inch), and MSS SP-75 for high-pressure applications. Thread forms include ISO metric, UNC, and UNF. Custom configurations including tap-end studs, stud bolts with reduced shanks, and non-standard thread pitches are available with 15 working day lead time.
Yes – Hastelloy B3 (UNS N10675) is the preferred choice over B2 (UNS N10665) for stud bolt applications for three key reasons. First, B3 has significantly improved thermal stability: the controlled Cr and W additions suppress the Ni4Mo ordering reaction that caused stress corrosion cracking in B2 during slow cooling after annealing or welding. Second, B3 studs can be used in the as-welded condition without post-weld heat treatment. Third, B3 offers broader resistance to mixed acid environments containing trace oxidising species that would accelerate attack on B2.
Yes – Hastelloy B3 is specifically engineered for hydrochloric acid service. It resists HCl at all concentrations from dilute to concentrated (37%), including boiling HCl, with corrosion rates typically below 0.13 mm/year. This performance is unmatched by any stainless steel grade. For stud bolt applications on HCl reactor flanges and acid storage nozzles, B3 is the industry-standard specification. Confirm operating temperature and acid concentration with our engineering team for a corrosion rate estimate.
Use a nickel-based anti-seize compound such as Molykote P-37, Jet-Lube KOPR-KOTE Pure Nickel, or Bostik Never-Seez Pure Nickel. Apply to both threaded ends and the nut bearing face. Reduce target torque values by approximately 20% compared to dry assembly values. Never use copper-based or zinc-based anti-seize on Hastelloy B3 – the galvanic potential difference in acid service environments can initiate localised corrosion at the thread contact interface.

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