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Hastelloy B3 Threaded Rods Manufacturer & Exporter in India

Explore Hastelloy B3 Threaded Rods 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 Threaded Rods?

Hastelloy B3 threaded rods are nickel-molybdenum alloy fasteners manufactured 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.

Hastelloy B3 threaded rods are specified for chemical process equipment, acid pickling systems, and pharmaceutical reactors where reducing acid environments demand maximum corrosion resistance combined with reliable mechanical strength. The alloy’s improved thermal stability over B2 eliminates the risk of knife-line and heat-affected zone attack, making B3 threaded rods the preferred choice for welded assemblies and high-temperature reducing acid service.

Quick Specifications

MaterialHastelloy B3
UNS NumberN10675
DIN Number2.4600
Material StandardASTM B335
Threaded Rod Standard (Metric)DIN 975 / DIN 976 / ISO 888
Threaded Rod Standard (Inch)ASME B18.31.3
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 Studs. 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 Studs

Technical Data

Hastelloy B3 Threaded Rods Dimensions, Sizes & Thread Standards

Hastelloy B3 Threaded Rods are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 975 (full thread rod) / DIN 976 (stud ends) / ISO 888. Custom lengths available. Inch dimensions per ASME B18.31.3. All Hastelloy B3 threaded rods dimensions are verified against applicable DIN, ISO, and ASME

Threaded Rod Dimensions - Metric (DIN 975 / ISO 888)

Size (M)Pitch (mm)Shank Dia (mm)Thread LengthMin L (mm)Max L (mm)
M61.06.0Full1001000
M81.258.0Full1001000
M101.510.0Full1002000
M121.7512.0Full1002000
M162.016.0Full1003000
M202.520.0Full1003000
M243.024.0Full1003000
M303.530.0Full2004000
M364.036.0Full2004000
M424.542.0Full2005000
M485.048.0Full2005000
M565.556.0Full3006000
M646.064.0Full3006000
M726.072.0Full3006000
M806.080.0Full3006000
M1006.0100.0Full5006000

Dimensional & Material Standards

StandardCoversThread
DIN 975Threaded rods, full threadMetric
DIN 976Stud ends, threaded rodMetric
ISO 888Bolts, screws, threaded rodsMetric
ASME B18.31.3Continuous threaded rodUNC/UNF
ASME B16.5Stud bolts for flangesUNC
MSS SP-75High-pressure stud boltsUNC
Material StandardRequirement
ASTM B335Bar/rod - UNS N10675
ASTM B619Welded pipe - UNS N10675
ASTM F468Fastener mechanical properties
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 Threaded Rods 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 threaded rods 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
Cobalt (Co)3.0% max
Carbon (C)0.01% max
Manganese (Mn)3.0% max
Silicon (Si)0.10% max
Aluminium (Al)0.50% max
Tungsten (W)3.0% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Hastelloy B3 Alloy Composition Matters for Threaded Rods

Mo (28.5–31.5%) — Reducing Acid Resistance
The ultra-high molybdenum content is the defining characteristic of Hastelloy B3. It provides exceptional resistance to hydrochloric acid at all concentrations and temperatures, including boiling HCl — the most aggressive reducing acid environment encountered in chemical processing. Threaded rod connections in HCl service remain corrosion-free where all stainless grades fail rapidly.
Low Carbon (0.01% max) — Thermal Stability
The ultra-low carbon ceiling in B3 eliminates carbide precipitation at grain boundaries during welding and thermal cycling. Unlike its predecessor B2, Hastelloy B3 threaded rods can be used in welded assemblies and heat-affected zones without risk of knife-line attack or sensitisation — a critical improvement for reactor and vessel construction.
Controlled Cr, W, and Fe — Improved Phase Stability
The carefully balanced additions of chromium, tungsten, and iron in B3 suppress the formation of deleterious intermetallic phases during slow cooling or intermediate temperature exposure. This gives Hastelloy B3 threaded rods superior fabrication tolerance and long-term microstructural stability compared to earlier B-series alloys.

Fastener Performance

Hastelloy B3 Threaded Rods Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Hastelloy B3 Threaded Rods per ASTM. Hastelloy B3 threaded rods 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 B3 Threaded Rods

Rod 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 environments.

Industry Applications

Hastelloy B3 Threaded Rods Applications — Industries & End Uses

Hastelloy B3 Threaded Rods 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.
Hastelloy B3 threaded rods are the primary fastener specification for hydrochloric acid reactors, HCl synthesis columns, acid storage tank internals, and pickling line equipment. The alloy withstands HCl at all concentrations up to and including boiling point – environments that destroy 316L, duplex, and even Hastelloy C276 in short service periods.
Threaded rod assemblies for pharmaceutical reactor vessel closures, agitator shaft supports, and heat exchanger tie rods in acetic acid, formic acid, and mixed reducing acid environments. Hastelloy B3 meets FDA material traceability requirements and is compatible with CIP/SIP cleaning cycles using dilute HCl-based sanitisers.
Threaded rods for heat exchanger shell-and-tube bundle tie rods, absorption tower internals, and acid cooler frame assemblies in sulphuric acid concentrations below 60% and phosphoric acid service. B3 outperforms B2 in intermediate temperature reducing acid service due to its improved phase stability.
Threaded rod connections for chlorine dioxide bleaching equipment, HCl wash stage vessels, and acid filtrate pump casings in kraft pulp mill bleach plants. Hastelloy B3 resists the combined attack of reducing acids and chloride-bearing process liquors that cause rapid corrosion of stainless steel fasteners.

Hastelloy B3 Threaded Rods Standards & International Certifications

Hastelloy B3 Threaded Rods 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 975 DIN 976-1 ASME B18.31.2 IS 1367 IS 1364
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

Buy Hastelloy B3 Threaded Rods from India's Leading Manufacturer — Get a Competitive Quote Today

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

Browse expert answers to common questions about Hastelloy B3 Threaded Rods 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 threaded rods selection and pricing.
Hastelloy B3 threaded rods are manufactured to DIN 975 (metric full-thread rod), DIN 976 (stud-end threaded rod), and ISO 888 for metric sizes. Inch sizes are produced per ASME B18.31.3 for continuous threaded rod in UNC and UNF thread forms. Custom thread forms including BSW, BSF, and BSPP are available on request with a 15 working day lead time. Standard stock lengths are 1000 mm and 3000 mm; cut-to-length and custom lengths are available in any increment.
Hastelloy B3 (UNS N10675) is the third-generation improvement over B2 (UNS N10665). The key differences relevant to threaded rod applications are: B3 has a lower carbon ceiling (0.01% max vs 0.02% in B2), which eliminates carbide precipitation and knife-line attack in welded assemblies. B3 also contains controlled additions of chromium, tungsten, and iron that suppress the formation of Ni4Mo intermetallic phases during slow cooling – a known embrittlement risk with B2. For threaded rod applications in fabricated equipment, B3 is always the preferred specification.
Yes – Hastelloy B3 is specifically engineered for hydrochloric acid resistance at all concentrations and temperatures, including boiling HCl. The 28.5-31.5% molybdenum content provides corrosion rates below 0.1 mm/year in concentrated HCl at temperatures up to 120°C. Threaded rod connections in HCl reactor vessels, acid storage tanks, and pickling equipment remain structurally sound in service conditions that cause rapid failure of 316L, 904L, duplex, and even Hastelloy C276 fasteners.
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 the full thread length and nut bearing faces before assembly. Reduce 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-wetted environments accelerates localised corrosion at the thread contact interface.

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