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Hastelloy B2 Threaded Rods Manufacturer & Exporter in India

Explore Hastelloy B2 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 B2 Threaded Rods?

Hastelloy B2 threaded rods 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.

Hastelloy B2 threaded rods are specified for chemical process equipment, reactor closures, and pressure vessel assemblies where reducing acid environments demand maximum corrosion resistance. The alloy maintains a minimum tensile strength of 760 MPa in the annealed condition and is free from the thermal instability issues associated with the original Hastelloy B grade, making it the preferred choice for fabricated assemblies requiring welding or elevated-temperature service.

Quick Specifications

MaterialHastelloy B2
UNS NumberN10665
DIN Number2.4617
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 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 Studs. 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 Studs

Technical Data

Hastelloy B2 Threaded Rods Dimensions, Sizes & Thread Standards

Hastelloy B2 Threaded Rods are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 975 (full thread rod) / DIN 976 (stud bolt rod) / ISO 888. Custom lengths available. Inch dimensions per ASME B18.31.3. All Hastelloy B2 threaded rods dimensions are verified against applicable DIN, ISO, and

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

Size (M)Pitch (mm)Nom. Dia (mm)Stress Area (mm²)Min L (mm)Max L (mm)
M61.06.020.11001000
M81.258.036.61001000
M101.510.058.01002000
M121.7512.084.31002000
M162.016.0157.01003000
M202.520.0245.01003000
M243.024.0353.01003000
M303.530.0561.02004000
M364.036.0817.02004000
M424.542.01120.02004000
M485.048.01470.02006000
M565.556.02030.02006000
M646.064.02680.02006000
M726.072.03460.03006000
M806.080.04340.03006000
M1006.0100.06990.03006000

Dimensional & Material Standards

StandardCoversThread
DIN 975Fully threaded rod, standard lengthsMetric
DIN 976Stud bolt rod, end-to-end threadMetric
ISO 888Threaded fasteners, nominal lengthsMetric
ASME B18.31.3Continuous threaded rodUNC/UNF
ASME B16.5Stud bolts for flangesUNC
MSS SP-75Stud bolts, high-pressure fittingsUNC
Material StandardRequirement
ASTM B335Bar/rod - UNS N10665
ASTM B462Forgings - 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 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 B2 threaded rods 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
Silicon (Si)0.10% max
Manganese (Mn)1.0% 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 Threaded Rods

Mo (26–30%) — Unmatched Reducing Acid Resistance
The exceptionally high molybdenum content gives Hastelloy B2 complete resistance to hydrochloric acid at all concentrations up to boiling point. This makes it the definitive choice for threaded rod assemblies in HCl reactor closures, acid storage vessels, and chemical process flanges where no other alloy performs reliably.
Ultra-Low Carbon (0.02% max) — Thermal Stability
The B2 grade was developed specifically to eliminate the grain boundary carbide precipitation and Ni4Mo phase formation that caused stress corrosion cracking in the original Hastelloy B. The 0.02% carbon ceiling ensures threaded rods retain full corrosion resistance after welding or moderate thermal exposure without post-weld heat treatment.
Low Iron and Chromium — Reducing Environment Optimised
Iron and chromium are deliberately minimised in B2 to prevent oxidising-condition sensitivity. Threaded rods assembled in pure reducing acid environments benefit from this lean chemistry, which avoids the corrosion acceleration that occurs when oxidising ions are present in alloys with higher Fe or Cr content.

Fastener Performance

Hastelloy B2 Threaded Rods Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Hastelloy B2 Threaded Rods per ASTM. Hastelloy B2 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 B2 Threaded Rods

Rod SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12725828
M1617514068
M20345276108
M24600480157
M301200960250
M3621001680363
M4233502680500
M4849503960658
?? 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-molybdenum alloys - galvanic incompatibility accelerates thread corrosion in acid environments.

Industry Applications

Hastelloy B2 Threaded Rods Applications — Industries & End Uses

Hastelloy B2 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 B2 threaded rods are the standard specification for closure bolting on hydrochloric acid reactors, acid storage tank nozzle flanges, and HCl synthesis unit pressure vessels. The alloy withstands boiling HCl at all concentrations where no stainless steel or standard nickel alloy survives. Fully compliant with ASME VIII Div. 1 pressure vessel bolting requirements.
Threaded rod assemblies for pharmaceutical reactor closures, crystalliser vessel covers, and solvent recovery column flanges where ultra-low carbon content prevents contamination and the alloy’s resistance to organic and inorganic acids ensures long service life without corrosion product ingress into process streams.
Hastelloy B2 threaded rods are used in chlorine dioxide bleaching tower flanges, digester closure hardware, and bleach plant pipe support assemblies. The alloy resists the combined attack of reducing acids and chlorine-bearing bleaching chemicals that rapidly degrade standard austenitic stainless steel fasteners.
Threaded rod sets for HF alkylation unit reactor flanges, acid settler vessel closures, and regenerator column connections. Hastelloy B2 provides reliable performance in hydrofluoric acid service at elevated temperatures where alloy 20 and duplex stainless steels are inadequate for long-term bolted joint integrity.

Hastelloy B2 Threaded Rods Standards & International Certifications

Hastelloy B2 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 B2 Threaded Rods from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Hastelloy B2 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 B2 Threaded Rods — Frequently Asked Questions

Browse expert answers to common questions about Hastelloy B2 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 B2 threaded rods selection and pricing.
Hastelloy B2 threaded rods are manufactured to DIN 975 (fully threaded rod in standard 1 m and 2 m lengths), DIN 976 (stud bolt rod with defined end thread lengths), ISO 888, and ASME B18.31.3 for inch continuous threaded rod. Metric sizes from M6 to M100 and inch sizes from ¼” to 4″ are available. Custom lengths up to 6000 mm are produced to order. Thread forms include ISO metric coarse, UNC, UNF, BSW, and BSPP on request with a 15 working day lead time.
Yes, with important caveats. Hastelloy B2 performs well in anhydrous HF and dilute aqueous HF at moderate temperatures. However, in concentrated aqueous HF above 70°C, corrosion rates increase and alloy C-276 or alloy C-22 may be more appropriate depending on exact process conditions. For HF alkylation unit service, always confirm the specific acid concentration, temperature, and presence of oxidising contaminants before specifying B2 threaded rods. Our engineering team can review your process data and recommend the correct alloy.
Hastelloy B2 threaded rods are rated for continuous service up to 425°C in reducing acid environments. Above this temperature, the Ni4Mo phase can precipitate at grain boundaries, reducing ductility and corrosion resistance. For applications above 425°C, Hastelloy B3 (UNS N10675) or Hastelloy C-276 should be evaluated. In non-acid elevated-temperature service, the limit is lower – always confirm the operating environment before specifying B2 for high-temperature bolting.
Store Hastelloy B2 threaded rods separately from carbon steel and low-alloy steel fasteners to prevent iron contamination and contact corrosion. Use dedicated stainless steel or plastic-lined storage racks. Never use carbon steel wire brushes or grinding wheels on B2 surfaces. For assembly in acid service, clean threads with acetone or isopropanol before applying nickel-based anti-seize. Avoid contact with copper, brass, or bronze tooling that could deposit galvanically incompatible metal particles on thread surfaces.

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  • Ahmedabad
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