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Hastelloy B2 Nuts Manufacturer & Exporter in India

Explore Hastelloy B2 Nuts 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 Nuts?

Hastelloy B2 nuts 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 reducing acids, particularly hydrochloric acid at all concentrations and temperatures up to the boiling point – a performance level unmatched by any stainless steel or standard nickel alloy.

Hastelloy B2 nuts are specified under NACE MR0175 for sour-service applications and are widely used in chemical processing, pharmaceutical manufacturing, and hydrometallurgical plants where concentrated HCl, sulfuric acid, and acetic acid environments demand absolute corrosion immunity. The alloy’s low carbon and silicon content minimises grain boundary carbide precipitation, ensuring consistent corrosion resistance in the as-welded condition.

Quick Specifications

MaterialHastelloy B2
UNS NumberN10665
DIN Number2.4617
Material StandardASTM B335
Nut Standard (Metric)DIN 934 / ISO 4032 / ISO 4033
Nut Standard (Inch)ASME B18.2.2
Thread FormISO Metric / UNC / UNF
Size 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 Screws, Hastelloy B2 Washers, Hastelloy B2 Studs, 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 Screws
Hastelloy B2 Washers
Hastelloy B2 Studs
Hastelloy B2 Threaded Rods

Technical Data

Hastelloy B2 Nuts Dimensions, Sizes & Thread Standards

Hastelloy B2 Nuts are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 934 (hex nut) / ISO 4032 / ISO 4033. Custom sizes available. Inch dimensions per ASME B18.2.2. All Hastelloy B2 nuts dimensions are verified against applicable DIN, ISO, and ASME B18 standards before dispatch from

Hex Nut Dimensions - Metric (DIN 934 / ISO 4032)

Size (M)Pitch (mm)A/F (mm)Nut Height (mm)A/C (mm)
M61.0105.011.05
M81.25136.514.38
M101.5178.018.90
M121.751910.020.03
M162.02413.026.75
M202.53016.032.95
M243.03619.039.55
M303.54624.050.85
M364.05529.060.79
M424.56534.071.30
M485.07538.082.60
M565.58545.093.56
M646.09551.0104.86
M726.010558.0115.60
M806.011564.0127.00
M1006.014580.0160.00

Dimensional & Material Standards

StandardCoversThread
DIN 934Hex nuts, standard heightMetric
ISO 4032Hex nuts, style 1Metric
ISO 4033Hex nuts, style 2 (high)Metric
ISO 7042All-metal prevailing torque nutsMetric
ASME B18.2.2Hex & heavy hex nutsUNC/UNF
ASME B16.5Heavy hex nuts for flangesUNC
MSS SP-75Heavy hex nuts, high-pressureUNC
Material StandardRequirement
ASTM B335Bar/rod - UNS N10665
ASTM F467Fastener 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 Nuts 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 nuts 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 Nuts

Mo (26–30%) — Reducing Acid Immunity
The exceptionally high molybdenum content gives Hastelloy B2 unmatched resistance to hydrochloric acid at all concentrations and temperatures, including boiling HCl — the most aggressive reducing acid environment encountered in chemical processing. Nut threads remain fully intact where stainless steel would dissolve within hours.
Ultra-Low C & Si — Grain Boundary Stability
Carbon is held to 0.02% max and silicon to 0.10% max, dramatically reducing the risk of grain boundary carbide and silicide precipitation during fabrication and welding. Hastelloy B2 nuts maintain full corrosion resistance in heat-affected zones without mandatory post-weld heat treatment.
Chromium-Free Design — Reducing Environment Optimisation
Unlike Hastelloy C276, alloy B2 contains virtually no chromium. This is intentional — chromium provides oxidising acid resistance but offers no benefit in purely reducing acid service. The chromium-free composition maximises molybdenum's effectiveness in HCl, H2SO4, and acetic acid environments where oxidising species are absent.

Fastener Performance

Hastelloy B2 Nuts Mechanical Properties & Torque Reference

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

Proof Load & Torque Reference - Hastelloy B2 Hex Nuts

Nut SizeProof Load (kN)Recommended Torque Dry (Nm)Recommended Torque Lubricated (Nm)
M12478568
M1688205164
M20137410328
M24198710568
M3031414201136
M3645824801984
M4262839503160
M4882458604688
?? 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 B2 Nuts Applications — Industries & End Uses

Hastelloy B2 Nuts 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 nuts application details and RealBolt stock availability.
Hastelloy B2 hex nuts and heavy hex nuts are the standard specification for flanged connections, reactor closures, and heat exchanger channel covers in hydrochloric acid production, regeneration, and handling plants. The alloy withstands HCl at all concentrations up to boiling point – no other commercially available alloy matches this performance. Widely specified by major EPC contractors for HCl synthesis furnace flanges and absorber column nozzle connections.
Hex nuts for reactor vessel closures, agitator shaft glands, and process piping flanges in pharmaceutical API synthesis where acetic acid, formic acid, and mixed reducing acid environments are present. Hastelloy B2 nuts are specified where product purity requirements prohibit the use of lower-grade alloys that may leach corrosion products into the process stream.
Flange nut sets for pressure leach autoclaves, acid wash columns, and steel pickling line equipment operating in hot dilute to concentrated sulfuric acid and hydrochloric acid. Hastelloy B2 nuts maintain full thread integrity in immersed acid service where 316L stainless steel nuts corrode within weeks of installation.
Heavy hex nuts for heat exchanger and reactor flanges in HF and H2SO4 alkylation units, crude distillation overhead systems, and amine treating unit piping where reducing acid condensates attack standard austenitic stainless fasteners. Specified per NACE MR0175 for sour service compatibility.

Hastelloy B2 Nuts Standards & International Certifications

Hastelloy B2 Nuts 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 934 ISO 4032 ASME B18.2.2 IS 1364 IS 1367
Certifications
ISO 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

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

Browse expert answers to common questions about Hastelloy B2 Nuts 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 nuts selection and pricing.
Hastelloy B2 hex nuts are available to DIN 934 (metric standard height), ISO 4032 (style 1), ISO 4033 (style 2 high), and ASME B18.2.2 (inch hex and heavy hex). Heavy hex nuts for ASME B16.5 flange stud bolt sets are supplied per ASME B18.2.2 heavy series. Coupling nuts, lock nuts, and flange nuts are available on request. Custom thread forms including BSW, BSF, and BSPP are available with 15 working day lead time.
Yes – Hastelloy B2 is the premier alloy for hydrochloric acid service. It resists HCl at all concentrations from dilute to concentrated, including at boiling point, where virtually all other alloys including Hastelloy C276 and titanium suffer accelerated corrosion. Hastelloy B2 nuts are specified for HCl synthesis furnace flanges, absorber column connections, and acid regeneration plant piping operating continuously at temperatures up to 120°C in concentrated HCl. The alloy’s 26-30% molybdenum content is the key to this exceptional reducing acid resistance.
No – this is a critical application limitation. Hastelloy B2 is specifically designed for reducing acid environments and performs poorly in oxidising conditions. Even small concentrations of oxidising agents such as ferric ions, cupric ions, dissolved oxygen, or nitric acid in an HCl stream can cause rapid corrosion of alloy B2. For mixed oxidising-reducing acid environments, Hastelloy C276 (UNS N10276) or Hastelloy C22 (UNS N06022) nuts should be specified instead. Always confirm the process chemistry with our engineering team before specifying B2 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 Special. Apply to the bolt threads and the nut bearing face before assembly. Reduce torque values by approximately 20% compared to dry assembly values. Never use copper-based or zinc-based anti-seize on Hastelloy B2 nuts – the galvanic potential difference between copper and nickel alloys accelerates corrosion, particularly in acid service environments where the anti-seize compound may be exposed to process leakage.

Industrial Cities We Serve:

  • Ahmedabad
  • Aurangabad
  • Bengaluru
  • Chennai
  • Coimbatore
  • Faridabad
  • Gandhidham
  • Greater Noida
  • Gurugram
  • Hazira
  • Hosur
  • Hyderabad
  • Jamnagar
  • Jamshedpur
  • Ludhiana
  • Mumbai
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