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Hastelloy C22 Screws Manufacturer & Exporter in India

Explore Hastelloy C22 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 C22 Screws?

Hastelloy C22 screws are nickel-chromium-molybdenum-tungsten alloy fasteners machined 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 oxidising and reducing media in a single alloy.

With a PREN exceeding 65, Hastelloy C22 screws outperform C276 in oxidising acid environments and resist pitting, crevice corrosion, and stress corrosion cracking across a broader pH range. These screws are specified under NACE MR0175/ISO 15156 for chemical process equipment, pharmaceutical reactors, flue gas scrubbers, and aggressive mixed-acid service where no other commercially available alloy provides adequate service life.

Quick Specifications

MaterialHastelloy C22
UNS NumberN06022
DIN Number2.4602
Material StandardASTM B574
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 Strength690 MPa (100 ksi) min
Yield Strength310 MPa (45 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 Washers, Hastelloy C22 Studs, 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 Washers
Hastelloy C22 Studs
Hastelloy C22 Threaded Rods

Technical Data

Hastelloy C22 Screws Dimensions, Sizes & Thread Standards

Hastelloy C22 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)Min L (mm)Max L (mm)
M40.77.04.03650
M50.88.55.04880
M61.010.06.0510100
M81.2513.08.0612150
M101.516.010.0816200
M121.7518.012.01020250
M162.024.016.01425300
M202.530.020.01730400
M243.036.024.01940500
M303.545.030.02250600
M364.054.036.02760800
M424.563.042.032801000
M485.072.048.0361001200
M565.584.056.0411201500
M646.096.064.0461402000

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 head cap screwsUNC/UNF
ASME B18.6.3Machine screwsUNC/UNF
DIN 7984Low head socket cap screwsMetric
Material StandardRequirement
ASTM B574Bar/rod - UNS N06022
ASTM B575Plate/sheet - UNS N06022
ASTM F468Fastener mechanical properties
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 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 C22 screws 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
Sulphur (S)0.02% max
? All heats verified by NABL-accredited spectrometry. PMI available on request.

Why Hastelloy C22 Alloy Composition Matters for Screws

Mo (12.5–14.5%) + W (2.5–3.5%) — Dual Resistance Mechanism
The combination of high molybdenum and tungsten gives Hastelloy C22 screws a PREN exceeding 65, providing resistance to both reducing acids (HCl, H2SO4) and oxidising media (HNO3, Cl2) simultaneously — a capability unique among commercially available nickel alloys.
Cr (20–22.5%) — Oxidising Acid Resistance
The elevated chromium content, higher than C276, gives C22 screws superior resistance to oxidising acids including nitric acid, chromic acid, and wet chlorine. This makes C22 the preferred choice for mixed-acid chemical reactors where C276 screws suffer accelerated attack.
Ultra-Low Carbon (0.010% max) — Sensitisation Prevention
The extremely low carbon ceiling prevents carbide precipitation at grain boundaries during welding or elevated-temperature service. Hastelloy C22 screws retain full intergranular corrosion resistance in the as-welded condition without post-weld heat treatment.

Fastener Performance

Hastelloy C22 Screws Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Hastelloy C22 Screws per ASTM. Hastelloy C22 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 C22 Screws (Metric)

Screw SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M6976
M8221812
M10443522
M12766132
M1618514862
M2036529298
M24630504142
M3012601008226
M3621901752328
?? 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 incompatibility accelerates corrosion at the thread interface.

Industry Applications

Hastelloy C22 Screws Applications — Industries & End Uses

Hastelloy C22 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 C22 screws application details and RealBolt stock availability.
Hastelloy C22 screws are the fastener of choice for chemical reactor vessel closures, agitator shaft seals, and heat exchanger cover plates handling mixed oxidising and reducing acid streams. The alloy’s dual resistance to HNO3 and HCl in the same service environment eliminates the need for alloy substitution when process chemistry varies. Specified per ASTM B574 and NACE MR0175.
Socket head cap screws in Hastelloy C22 are widely used in pharmaceutical reactor internals, filter housings, and high-purity process connections where FDA-compliant materials, crevice corrosion resistance, and cleanability are mandatory. The ultra-low carbon content prevents contamination from carbide precipitation in CIP/SIP cleaning cycles.
C22 screws secure absorber tower internals, spray header assemblies, and mist eliminator frames in FGD scrubbers where saturated HCl, H2SO4, and HF vapours combine with chloride-laden slurry to destroy standard stainless steel and even C276 fasteners. Hastelloy C22 provides measurably longer service life in this environment.
Hastelloy C22 machine screws and hex screws are specified for bleach plant equipment including chlorine dioxide bleaching towers, washer drum covers, and filtrate tank connections. The alloy resists hypochlorite, chlorine dioxide, and acidic bleach filtrates that cause rapid stress corrosion cracking in 316L and duplex stainless steel fasteners.

Hastelloy C22 Screws Standards & International Certifications

Hastelloy C22 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 9001:2015NACE MR0175NABL LabPED 2014/68/EUMTC 3.1 / 3.2

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

Partner with RealBolt — India’s leading manufacturer of certified Hastelloy C22 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 C22 Screws — Frequently Asked Questions

Browse expert answers to common questions about Hastelloy C22 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 C22 screws selection and pricing.
Hastelloy C22 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 / ISO 10642), button head screws (ISO 7380), and low head socket cap screws (DIN 7984). Inch equivalents are available per ASME B18.3 and ASME B18.6.3. Custom drive types including Torx, Phillips, and slotted are available on request with 15 working day lead time.
Hastelloy C22 screws outperform C276 in oxidising acid environments – particularly nitric acid, chromic acid, and wet chlorine – due to higher chromium content (20-22.5% vs 14.5-16.5%). Both alloys offer similar resistance to reducing acids such as HCl and H2SO4. For mixed-acid service or processes where chemistry varies between oxidising and reducing conditions, C22 is the preferred specification. C276 remains the choice for pure reducing acid service where cost is a factor.
Yes – Hastelloy C22 screws are widely used in pharmaceutical reactor internals, high-purity process connections, and food-grade equipment where FDA-compliant materials are required. The ultra-low carbon content (0.010% max) prevents carbide precipitation and contamination. The alloy’s smooth passive surface resists bacterial adhesion and withstands aggressive CIP (clean-in-place) and SIP (sterilise-in-place) cycles using caustic soda, nitric acid, and steam without surface degradation.
Hastelloy C22 screws maintain structural integrity and corrosion resistance up to 1038°C in oxidising atmospheres. In reducing or sulphur-bearing high-temperature environments, the practical limit is approximately 760°C. For continuous elevated-temperature service above 500°C, specify solution-annealed material and verify hardness compliance with NACE MR0175 (=35 HRC) if sour service is involved. Thermal cycling resistance is excellent due to the alloy’s low thermal expansion coefficient of 12.4 µm/m·°C.

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
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  • Mexico
  • Germany
  • UK
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  • Norway
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  • Turkey
  • UAE
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  • Qatar
  • Oman
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