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Hastelloy B2 Screws Manufacturer & Exporter in India

Explore Hastelloy B2 Screws 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 Screws?

Hastelloy B2 screws are nickel-molybdenum alloy fasteners machined 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 screws are specified for chemical process equipment, reactor closures, and distillation column internals where reducing acid environments would rapidly corrode alternative fastener materials. The alloy’s low carbon and silicon content minimises grain boundary carbide precipitation, ensuring corrosion resistance is maintained in the heat-affected zone of welded assemblies.

Quick Specifications

MaterialHastelloy B2
UNS NumberN10665
DIN Number2.4617
Material StandardASTM B335
Screw Standard (Metric)DIN 912 / DIN 933 / ISO 4762
Screw Standard (Inch)ASME B18.3 / ASME B18.6.3
Thread FormISO Metric / UNC / UNF
Diameter RangeM4-M64 / #10-2½"
Tensile Strength760 MPa (110 ksi) min
Yield Strength350 MPa (51 ksi) min
HardnessMax 241 HB / 99 HRB
? 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 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 Nuts
Hastelloy B2 Washers
Hastelloy B2 Studs
Hastelloy B2 Threaded Rods

Technical Data

Hastelloy B2 Screws Dimensions, Sizes & Thread Standards

Hastelloy B2 Screws are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 912 (socket head cap screws) / DIN 933 (hex full thread) / ISO 4762. Custom lengths in 5mm increments. Inch dimensions available per ASME B18.3 and ASME B18.6.3.

Socket Head Cap Screw Dimensions - Metric (DIN 912 / ISO 4762)

Size (M)Pitch (mm)Head Dia (mm)Head Ht (mm)Socket (mm)Max L (mm)
M40.77.04.03100
M50.88.55.04120
M61.010.06.05150
M81.2513.08.06200
M101.516.010.08250
M121.7518.012.010300
M162.024.016.014400
M202.530.020.017500
M243.036.024.019600
M303.545.030.022800
M364.054.036.0271000
M424.563.042.0321000
M485.072.048.0361200
M565.584.056.0411500
M646.096.064.0462000

Dimensional & Material Standards

StandardCoversThread
DIN 912Socket head cap screwsMetric
DIN 933Hex screws, full threadMetric
ISO 4762Socket head cap screwsMetric
ISO 4017Hex head screws, full threadMetric
ASME B18.3Socket cap & set screwsUNC/UNF
ASME B18.6.3Machine screwsUNC/UNF
DIN 7984Low-head socket cap screwsMetric
Material StandardRequirement
ASTM B335Bar/rod - UNS N10665
ASTM B333Plate/sheet - UNS N10665
ASTM F468Fastener mechanical properties
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Hastelloy B2 Chemical Composition

Hastelloy B2 Screws 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 screws order from RealBolt.

Chemical Composition per ASTM B335

ElementComposition (%)
Nickel (Ni)Balance (min 65%)
Molybdenum (Mo)26.0-30.0%
Chromium (Cr)1.0% max
Iron (Fe)2.0% 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
Sulphur (S)0.03% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Hastelloy B2 Alloy Composition Matters for Screws

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 up to boiling point, as well as sulphuric, phosphoric, and acetic acids in reducing conditions — environments that destroy standard stainless steel screws within hours.
Ultra-Low C & Si — Grain Boundary Stability
Carbon is held to 0.02% max and silicon to 0.10% max. This dramatically reduces the risk of grain boundary carbide and silicide precipitation during fabrication and welding, preserving the alloy's corrosion resistance in the heat-affected zone without mandatory post-weld heat treatment.
Nickel-Rich Matrix — Structural Integrity in Reducing Environments
The nickel-dominant base (65%+) ensures Hastelloy B2 screws maintain mechanical integrity in strongly reducing chemical environments where oxidising agents are absent. This makes them the preferred fastener choice for HCl synthesis, acid pickling, and pharmaceutical reactor closures.

Fastener Performance

Hastelloy B2 Screws Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Hastelloy B2 Screws per ASTM. Hastelloy B2 screws 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 Screws

Screw SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M6976
M8221812
M10443522
M12766136
M1618514872
M20365292115
M24630504165
M3012601008262
?? 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 Screws Applications — Industries & End Uses

Hastelloy B2 Screws 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 screws application details and RealBolt stock availability.
Hastelloy B2 screws are the industry-standard fastener for HCl synthesis furnace closures, absorption column internals, and acid storage tank cover plates. The alloy withstands hydrochloric acid at all concentrations up to and including boiling point – conditions that cause rapid corrosion failure in stainless steel and even Hastelloy C276 screws.
Socket head cap screws and hex screws in Hastelloy B2 are specified for reactor closure flanges, agitator shaft seals, and internal baffle attachment in pharmaceutical API synthesis and fine chemical production where reducing acid media, including acetic, formic, and dilute sulphuric acid, are present at elevated temperatures.
Hastelloy B2 screws secure immersion basket frames, tank liner attachment rails, and heat exchanger cover plates in steel and titanium pickling lines operating in hot HCl and mixed acid baths. Their resistance to reducing acid attack eliminates the frequent fastener replacement cycles associated with stainless steel hardware.
In sulphuric acid service below 60% concentration and at moderate temperatures, Hastelloy B2 screws outperform Hastelloy C276 due to the higher molybdenum content. They are used in dilute H2SO4 reactor closures, acid cooler channel covers, and pump casing assembly in fertiliser and mining chemical plants.

Hastelloy B2 Screws Standards & International Certifications

Hastelloy B2 Screws 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 912 DIN 913 DIN 914 DIN 915 DIN 916 DIN 6912 ISO 4762 ISO 10642 ASME B18.3 EN ISO 4762 IS 1367
Certifications
ISO 9001:2015NABL LabPED 2014/68/EUMTC 3.1 / 3.2EN 10204

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

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

Browse expert answers to common questions about Hastelloy B2 Screws 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 screws selection and pricing.
Hastelloy B2 screws are available in socket head cap screws (DIN 912 / ISO 4762), hex head screws (DIN 933 / ISO 4017), pan head machine screws (DIN 7985), countersunk screws (DIN 965), set screws (DIN 913-916), and low-head socket cap screws (DIN 7984). Inch equivalents are manufactured per ASME B18.3 and ASME B18.6.3. Custom drive types including Torx and hex flange are available on request with 15 working day lead time.
No – Hastelloy B2 is specifically designed for reducing acid environments. In the presence of oxidising agents such as ferric chloride, cupric chloride, nitric acid, or wet chlorine, the alloy’s corrosion resistance drops sharply. For mixed or oxidising acid service, Hastelloy C276 (UNS N10276) or Hastelloy C22 (UNS N06022) screws are the correct specification. Always confirm the process chemistry before selecting B2 fasteners.
Hastelloy B2 screws are rated to 425°C in reducing service environments. Above this temperature, the alloy becomes susceptible to precipitation of Ni4Mo intermetallic phases, which can cause embrittlement and reduced corrosion resistance. For high-temperature reducing acid service above 425°C, consult our engineering team for alternative alloy recommendations. The alloy should not be used in the 260-430°C range for prolonged periods without specific metallurgical review.
Use nickel-based anti-seize compound (Molykote P-37, Jet-Lube KOPR-KOTE Pure Nickel, or equivalent) on threads and bearing faces. Reduce torque values by approximately 20% compared to dry assembly. Never use copper-based or zinc-based anti-seize on Hastelloy B2 screws – the galvanic potential difference in acid environments accelerates localised corrosion at the thread contact zone and can cause premature fastener failure.

Industrial Cities We Serve:

  • Ahmedabad
  • Aurangabad
  • Bengaluru
  • Chennai
  • Coimbatore
  • Faridabad
  • Gandhidham
  • Greater Noida
  • Gurugram
  • Hazira
  • Hosur
  • Hyderabad
  • Jamnagar
  • Jamshedpur
  • Ludhiana
  • Mumbai
  • Mundra
  • Mysuru
  • Nagpur
  • Nashik
  • Navi Mumbai
  • Noida
  • Pune
  • Rajkot
  • Sanand
  • Surat
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  • Tiruppur
  • Vadodara
  • Visakhapatnam

Countries We Export To:

  • US
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  • UAE
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  • Oman
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