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Incoloy 800HT Studs Manufacturer & Exporter in India

Explore Incoloy 800HT Studs Manufacturer & Exporter in India manufactured for demanding industrial applications with reliable strength, corrosion resistance and compliance with international standards.
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-196

Min Temp

870

Max Temp

🌡

870

Suitable for continuous service up to approximately 870°C under typical operating conditions.

⚡

620

Typical tensile strength around 620 MPa depending on product form and heat treatment.

🛡

Very Good

Very Good corrosion resistance in a wide range of industrial environments.

⚖

8

Typical density is approximately 8.0 g/cm³.

Product Overview

What are Incoloy 800HT Studs?

Incoloy 800HT studs are high-temperature nickel-iron-chromium alloy fasteners manufactured from UNS N08811 bar stock conforming to ASTM B408. The alloy’s enhanced carbon (0.06-0.10%) and aluminum/titanium content provide superior creep and rupture strength compared to standard Incoloy 800, making these studs ideal for bolted joints exposed to prolonged service above 600°C.

Incoloy 800HT studs are specified for critical flange, vessel, and heat exchanger connections in petrochemical, power generation, and furnace applications where resistance to oxidation, carburization, and thermal cycling is essential. All fasteners are supplied with full traceability and EN 10204 3.1 certification.

Quick Specifications

MaterialIncoloy 800HT
UNS NumberN08811
DIN Number1.4959 / 1.4876
Material StandardASTM B408
Stud Standard (Metric)DIN 976 / DIN 975
Stud Standard (Inch)ASME B16.5 / B18.31.2
Thread FormISO Metric / UNC / UNF
Diameter RangeM6-M72 / ¼"-3"
Tensile Strength600 MPa (87 ksi) min
Yield Strength275 MPa (40 ksi) min
HardnessMax 90 HRB / 200 HB
? All material certified by NABL-accredited laboratory. PMI and grain size verification available on request.

Complete the Fastener Set

Other Incoloy 800HT Fastener Products Available from RealBolt

RealBolt also manufactures the complete Incoloy 800HT fastener range from certified iron-nickel-chromium alloy bar stock, including Incoloy 800HT Bolts, Incoloy 800HT Nuts, Incoloy 800HT Screws, Incoloy 800HT Washers, and Incoloy 800HT Threaded Rods. All Incoloy 800HT fastener types are produced to ASTM with full EN 10204 MTC 3.1/3.2 documentation.
Incoloy 800HT Bolts
Incoloy 800HT Nuts
Incoloy 800HT Screws
Incoloy 800HT Washers
Incoloy 800HT Threaded Rods

Technical Data

Incoloy 800HT Studs Dimensions, Sizes & Thread Standards

Incoloy 800HT Studs are available in metric M6–M100 and inch ¼″–4″ as standard. Per DIN 976 (metric threaded rods) / DIN 975 (full thread) / ASME B16.5 (stud bolts for flanges). Custom cut lengths available in 5mm increments. Inch dimensions per ASME B18.31.2.

Stud Bolt Dimensions - Metric (DIN 976)

Size (M)Pitch (mm)Thread Length (mm)Min L (mm)Max L (mm)
M61.018202000
M81.2524252000
M101.530302000
M121.7536352000
M162.048402000
M202.560502000
M243.072602000
M303.590702000
M364.0108802000
M424.5126902000
M485.01441002000
M565.51681202000
M646.01921402000
M726.02161602000

Dimensional & Material Standards

StandardCoversThread
DIN 976Stud bolts, full threadMetric
DIN 975Threaded rods, full threadMetric
ASME B16.5Stud bolts for flangesUNC
ASME B18.31.2Continuous thread studsUNC/UNF
ISO 898-1Mechanical propertiesMetric
Material StandardRequirement
ASTM B408Bar/rod - UNS N08811
ASTM B564Forged nuts - N08811
EN 10204 3.1Mill test certificate
EN 10204 3.2TPI-witnessed MTC

Material Chemistry

Incoloy 800HT Chemical Composition

Incoloy 800HT Studs are produced from an iron-nickel-chromium alloy with controlled nickel (30–46%), chromium (19–23%), and molybdenum content per ASTM. Nickel and chromium together resist high-temperature oxidation to 1093°C in 800H grades, while molybdenum and copper additions in Incoloy 825 provide sulfuric and phosphoric acid resistance.

Chemical Composition per ASTM B408

ElementComposition (%)
Nickel (Ni)30.0-35.0
Chromium (Cr)19.0-23.0
Iron (Fe)39.5 min
Carbon (C)0.06-0.10
Aluminum (Al)0.25-0.60
Titanium (Ti)0.25-0.60
Manganese (Mn)1.5 max
Silicon (Si)1.0 max
Sulfur (S)0.015 max
Copper (Cu)0.75 max
? All heats verified by NABL-accredited spectrometry. PMI and grain size verification available on request.

Why Incoloy 800HT Alloy Composition Matters for Studs

Al + Ti (0.25–0.60% each) — Creep Strength
Aluminum and titanium combine to form a stable gamma prime phase, dramatically improving creep and rupture strength at temperatures above 600°C. This is critical for stud bolts in reformer and furnace flanges.
High Nickel & Chromium — Oxidation Resistance
The high nickel and chromium content ensures excellent resistance to oxidation, carburization, and nitridation, even in cyclic high-temperature environments. This prevents stud bolt scaling and loss of preload.
Controlled Carbon (0.06–0.10%)
The higher carbon content in 800HT (vs 800H) further enhances creep rupture properties, making these studs reliable for long-term service in petrochemical and power plant bolted joints.

Fastener Performance

Incoloy 800HT Studs Mechanical Properties & Torque Reference

The table below lists mechanical properties and torque reference for Incoloy 800HT Studs per ASTM. Incoloy 800HT studs achieve 620 MPa tensile strength, with hardness, yield, and elongation values verified by NABL-accredited testing and reported in the EN 10204 MTC.

Stud SizeDry (Nm)Lubricated (Nm)Clamp Load (kN)
M12625025
M1615012050
M2029523680
M24510408115
M301020816185
M3617801424265
M4228402272355
M4842003360470
?? Anti-galling: Use nickel-based anti-seize (Molykote P-37 or equivalent). Lubricated values assume K=0.15. Avoid copper-based anti-seize on Incoloy alloys.

Industry Applications

Incoloy 800HT Studs Applications — Industries & End Uses

Incoloy 800HT Studs from RealBolt are specified across petrochemical furnaces, chemical processing, nuclear, and power generation where very good corrosion resistance and 620 MPa tensile strength are required for reliable fastener performance. Click each industry below for detailed application examples.
Incoloy 800HT stud bolts are the industry standard for bolted joints in steam methane reformers, ammonia converters, and hydrogen plant radiant coils. Their high creep strength and oxidation resistance ensure reliable flange sealing at 800-1100°C in H2-rich atmospheres.
Used for securing furnace doors, muffles, and radiant tube assemblies in continuous annealing, carburizing, and heat treatment lines. Incoloy 800HT studs maintain preload and resist scaling in cyclic thermal environments.
Stud bolts for superheater header flanges, HRSG ducting, and high-temperature steam piping in combined cycle and fossil power plants. 800HT’s stability prevents bolt relaxation and joint leakage during thermal cycling.
Flange stud sets for nitric acid, urea, and organic acid process equipment where resistance to mixed oxidizing and carburizing environments is required. 800HT is preferred over stainless steel for long-term reliability.

Incoloy 800HT Studs Standards & International Certifications

Incoloy 800HT 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 9001:2015EN 10204 3.1/3.2PED 2014/68/EUNABL Lab

Buy Incoloy 800HT Studs from India's Leading Manufacturer — Get a Competitive Quote Today

Partner with RealBolt — India’s leading manufacturer of certified Incoloy 800HT 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

Incoloy 800HT Studs — Frequently Asked Questions

Browse expert answers to common questions about Incoloy 800HT Studs from RealBolt — covering grade differences, ASTM B408/B425 standards, oxidation limits, acid resistance, sizes, and MTC documentation. Contact our technical team directly for project-specific guidance on Incoloy 800HT studs selection and pricing.
Incoloy 800HT stud bolts are available to DIN 976 (metric full thread), DIN 975 (threaded rods), ASME B16.5 (flange studs), and ASME B18.31.2 (inch continuous thread). Custom thread forms (BSW, BSF, Whitworth) and cut lengths are available on request with a typical lead time of 2-3 weeks.
Use nickel-based anti-seize compound (such as Molykote P-37 or Jet-Lube Pure Nickel) on threads and nut faces to prevent galling and facilitate disassembly after high-temperature service. Avoid copper-based anti-seize, as it can cause embrittlement at elevated temperatures. Lubricated torque values should be reduced by 20% compared to dry assembly.
Yes – Incoloy 800HT is engineered for superior creep and rupture strength at temperatures up to 1100°C. It is the preferred stud material for reformer, furnace, and superheater flange connections where standard stainless steels would fail due to creep or scaling.
No formal MOQ for standard sizes (M12-M36) held in stock – we supply from single pieces for urgent maintenance. Custom sizes and cut lengths have an MOQ of 10 kg. Flange stud sets are supplied as matched sets with no minimum. Quantity price breaks at 50 pcs, 200 pcs, and 500 pcs.

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