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Hastelloy C22 Studs Manufacturer & Exporter in India

Explore Hastelloy C22 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 C22 Studs?

Hastelloy C22 studs are nickel-chromium-molybdenum-tungsten alloy fasteners manufactured from UNS N06022 bar stock conforming to ASTM B574. The alloy’s exceptional corrosion resistance stems from its precisely balanced chemistry – 20-22.5% chromium, 12.5-14.5% molybdenum, and 2.5-3.5% tungsten – delivering outstanding resistance to both oxidizing and reducing corrosive media that no single-phase stainless steel can replicate.

With a PREN exceeding 65, Hastelloy C22 studs resist pitting, crevice corrosion, and stress corrosion cracking in aggressive chloride, sulfuric acid, hydrochloric acid, and mixed acid environments. These studs are specified under NACE MR0175/ISO 15156 for sour-service pressure vessel closures, chemical reactor flanges, and pharmaceutical process equipment worldwide.

Quick Specifications

MaterialHastelloy C22
UNS NumberN06022
DIN Number2.4602
Material StandardASTM B574
Stud Standard (Metric)DIN 938 / DIN 939 / ISO 4032
Stud Standard (Inch)ASME B18.31.2 / ASME B16.5
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M100 / ¼"-4"
Tensile Strength690 MPa (100 ksi) min
Yield Strength283 MPa (41 ksi) min
HardnessMax 35 HRC / 241 HB
? All material certified by NABL-accredited laboratory. PMI available on request.

Complete the Fastener Set

Other Hastelloy C22 Fastener Products Available from RealBolt

RealBolt also manufactures the complete Hastelloy C22 fastener range from certified nickel-molybdenum-chromium superalloy bar stock, including Hastelloy C22 Bolts, Hastelloy C22 Nuts, Hastelloy C22 Screws, Hastelloy C22 Washers, and Hastelloy C22 Threaded Rods. All Hastelloy C22 fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Hastelloy C22 Bolts
Hastelloy C22 Nuts
Hastelloy C22 Screws
Hastelloy C22 Washers
Hastelloy C22 Threaded Rods

Technical Data

Hastelloy C22 Studs Dimensions, Sizes & Thread Standards

Hastelloy C22 Studs are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 938 (metal-end stud) / DIN 939 (stud bolt) / ASME B16.5 (flange stud bolt). Custom lengths in 5mm increments. Inch dimensions available per ASME B18.31.2. All Hastelloy C22 studs dimensions conform to applicable DIN, ISO, and ASME B18 standards.

Stud Bolt Dimensions - Metric (DIN 938 / DIN 939)

Size (M)Pitch (mm)Thread Length (mm)Body Dia (mm)Min L (mm)Max L (mm)
M61.096.020200
M81.25128.025250
M101.51510.030300
M121.751812.035400
M162.02416.045500
M202.53020.055600
M243.03624.065700
M303.54530.080900
M364.05436.01001000
M424.56342.01201200
M485.07248.01401500
M565.58456.01601800
M646.09664.01802000
M726.010872.02002200
M806.012080.02202500
M1006.0150100.02503000

Dimensional & Material Standards

StandardCoversThread
DIN 938Studs, metal-end engagement 1dMetric
DIN 939Studs, metal-end engagement 1.25dMetric
ISO 4032Hex nuts, style 1Metric
ASME B18.31.2Continuous-thread studsUNC/UNF
ASME B16.5Stud bolts for flangesUNC
MSS SP-75Stud bolts, high-pressure fittingsUNC
ASME B16.47Large diameter flange stud boltsUNC
Material StandardRequirement
ASTM B574Bar/rod - UNS N06022
ASTM B575Plate/sheet - UNS N06022
ASTM F467Fastener nut mechanical
NACE MR0175Sour service =35 HRC
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Hastelloy C22 Chemical Composition

Hastelloy C22 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 C22 studs order from RealBolt.

Chemical Composition per ASTM B574

ElementComposition (%)
Nickel (Ni)Balance (min ~56%)
Chromium (Cr)20.0-22.5%
Molybdenum (Mo)12.5-14.5%
Tungsten (W)2.5-3.5%
Iron (Fe)2.0-6.0%
Cobalt (Co)2.5% max
Carbon (C)0.010% max
Manganese (Mn)0.50% max
Silicon (Si)0.08% max
Vanadium (V)0.35% max
Phosphorus (P)0.02% max
Sulfur (S)0.02% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Hastelloy C22 Alloy Composition Matters for Studs

Mo (12.5–14.5%) + W (2.5–3.5%) — Dual Resistance to Oxidizing and Reducing Media
The combined molybdenum and tungsten content gives Hastelloy C22 a PREN exceeding 65, providing resistance to both oxidizing acids (nitric, chromic) and reducing acids (hydrochloric, sulfuric) simultaneously — a capability no single-element alloy can match. This makes C22 studs the preferred choice for mixed-acid process flanges.
Cr (20–22.5%) — Oxidizing Acid and High-Temperature Resistance
The elevated chromium content forms a tenacious passive oxide film that resists attack in nitric acid, wet chlorine, and hypochlorite environments. For stud applications in bleach plant equipment and FGD systems, this chromium level is critical to long-term thread integrity.
Ultra-Low Carbon (0.010% max) — Sensitization-Free Welding
The extremely low carbon ceiling prevents carbide precipitation at grain boundaries during welding or elevated-temperature service. Hastelloy C22 studs welded into assemblies or used in heat-affected zones retain full corrosion resistance without post-weld annealing — a significant advantage over standard C-276 in fabricated equipment.

Fastener Performance

Hastelloy C22 Studs Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Hastelloy C22 Studs per ASTM. Hastelloy C22 studs 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 C22 Studs

Stud SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12725826
M1617514063
M20345276101
M24600480146
M301200960233
M3620801664338
M4233202656465
M4849203936611
?? Anti-galling: Use nickel-based anti-seize (Molykote P-37 or Bostik Never-Seez Pure Nickel). Lubricated values assume K=0.15. Never use copper-based or zinc-based anti-seize on nickel alloys - galvanic incompatibility accelerates thread corrosion.

Industry Applications

Hastelloy C22 Studs Applications — Industries & End Uses

Hastelloy C22 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 C22 studs application details and RealBolt stock availability.
Hastelloy C22 stud bolt sets are the benchmark specification for pressure vessel closures, agitator nozzle flanges, and heat exchanger channel covers in mixed acid environments including HCl/H2SO4, HNO3/HF, and phosphoric acid service. PREN 65+ ensures thread integrity where SS 316L and even C-276 suffer accelerated attack.
Stud bolts for FGD absorber tower flanges, spray header connections, and ductwork expansion joint flanges where saturated HCl-bearing flue gas at 50-80°C creates severe crevice corrosion conditions. Hastelloy C22 outperforms C-276 in oxidizing FGD environments due to its higher chromium content.
Stud bolt sets for sanitary flange connections, reactor closure heads, and autoclave pressure closures in pharmaceutical API synthesis where both oxidizing and reducing process streams alternate within the same vessel. FDA-compatible, ultra-low carbon chemistry prevents contamination risk.
Studs for chlorine dioxide bleaching tower flanges, washer drum connections, and hypochlorite storage vessel nozzles. Hastelloy C22 resists wet chlorine, chlorine dioxide, and sodium hypochlorite at elevated temperatures where titanium and C-276 show measurable corrosion rates.

Hastelloy C22 Studs Standards & International Certifications

Hastelloy C22 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 C22 Studs from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Hastelloy C22 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.
022-6743-7972
+91 90226 36025
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Answers for Buyers

Hastelloy C22 Studs — Frequently Asked Questions

Browse expert answers to common questions about Hastelloy C22 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 C22 studs selection and pricing.
Hastelloy C22 studs are manufactured to DIN 938 (metal-end engagement 1d), DIN 939 (metal-end engagement 1.25d), and ASME B18.31.2 for continuous-thread studs. Flange stud bolt sets are produced per ASME B16.5 (Class 150-2500) and ASME B16.47 (large diameter flanges). Custom configurations including tap-end studs, double-end studs, and fully threaded studs are available in both metric and inch thread forms with 15 working day lead time.
Hastelloy C22 (UNS N06022) outperforms C-276 (UNS N10276) in oxidizing acid environments due to its higher chromium content (20-22.5% vs 14.5-16.5%). C22 also has a lower carbon ceiling (0.010% max vs 0.010% max) and superior resistance to pitting in ferric chloride and wet chlorine. For mixed-acid service or FGD applications where both oxidizing and reducing conditions exist, C22 studs are the preferred specification. C-276 remains competitive in pure reducing acid service at lower cost.
Yes – Hastelloy C22 studs supplied in the annealed condition with hardness not exceeding 35 HRC fully comply with NACE MR0175/ISO 15156 for sour-service (H2S-bearing) applications. Each batch is supplied with a hardness survey report. For Class 900-2500 flange stud bolt sets in sour service, we provide individual hardness certification per stud on request, along with EN 10204 3.1 or 3.2 mill test certificates covering chemical composition, mechanical properties, and hardness.
Standard sizes from M12 to M36 and ½” to 1½” are held ex-stock in Mumbai with no formal MOQ – single-piece supply is available for emergency maintenance and shutdown requirements. Custom sizes and non-standard lengths carry a minimum of 10 kg per size. ASME B16.5 flange stud bolt sets are supplied by the complete set with no minimum quantity. Volume price breaks apply at 25 sets, 100 sets, and 250 sets for flange stud bolt assemblies.

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
  • Thane
  • Tiruppur
  • Vadodara
  • Visakhapatnam

Countries We Export To:

  • US
  • Canada
  • Mexico
  • Germany
  • UK
  • France
  • Italy
  • Spain
  • Netherlands
  • Belgium
  • Poland
  • Sweden
  • Norway
  • Denmark
  • Turkey
  • UAE
  • Saudi Arabia
  • Qatar
  • Oman
  • Kuwait
  • Bahrain
  • South Africa
  • Egypt
  • Nigeria
  • Australia
  • New Zealand
  • Singapore
  • Malaysia
  • Indonesia
  • Thailand
  • Vietnam
  • South Korea
  • Japan
  • Brazil