Incoloy Threaded Rods
RAYCHIN SPECIALTY METALS FASTENERS: BOLTS, NUTS, SCREWS, WASHERS, STUDS, THREADED RODS, U-BOLT, J-BOLTS
STANDARD AND CUSTOMIZED, SMALL BATCH AND LARGE BATCH, IMPERIAL AND METRIC
Incoloy Fasteners is widely used for its resistance to seawater, brine, sour gas and high chloride environments at elevated temperatures, which make it a popular choice in the oil and gas and power industries.
A Ni-Cr alloy with very good high temperature stability
Oxidization and carburization resistant up to 1400°F / 760°C
Good corrosion resistance, which increases with the various grades
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RAYCHIN LIMITED
Specialist in Incoloy Threaded Rods · Fully Threaded · Continuous Thread · CustomIncoloy Threaded Rods: Nickel-Iron-Chromium Superalloy Studding for Extreme Environments
RAYCHIN LIMITED is a recognized expert in Incoloy threaded rods — from Incoloy fully threaded rods, Incoloy continuous thread studs, Incoloy studding to custom non-standard configurations across all major Incoloy grades. Incoloy alloys are nickel-iron-chromium superalloys designed for high-temperature and corrosive service. The family includes Incoloy 800 series (800, 800H, 800HT) optimized for high-temperature strength and oxidation resistance up to 1150°C, and Incoloy 825/925 grades with molybdenum and copper additions for exceptional resistance to reducing acids and sour gas environments. The high nickel content ensures resistance to chloride stress corrosion cracking, while chromium provides oxidation resistance. Threaded rods, also known as fully threaded rods, continuous thread studs, or all-thread rods, feature continuous threads along their entire length, allowing them to be cut to any length and used with standard nuts and washers. They are essential components in pipe supports, flange connections, tension applications, and structural assemblies. Our portfolio includes threaded rods manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS standards. Engineered for the most demanding environments where high-temperature strength and corrosion resistance are critical. Incoloy threaded rods are supplied in solution annealed condition (or aged for 925) with full traceability and third-party certifications.
Complete Range of Incoloy Threaded Rods – Configurations
Fully Threaded Rods (DIN 975 / ASME B18.31.1M)
Incoloy fully threaded rods manufactured to DIN 975, ISO 4014, and ASME B18.31.1M standards. Features continuous threads along the entire length for maximum versatility in applications requiring engagement along the full rod length. Ideal for high-temperature corrosive applications up to 1150°C for grade 800 series, and up to 540°C for acid service with grade 825. Precision rolled threads for superior strength and corrosion resistance. Available in diameters from M6 to M100 (metric) and 1/4" to 4" (inch) in standard lengths of 1m, 2m, 3m, and custom lengths up to 6m. Supplied in solution annealed condition per ASTM standards. Suitable for pipe supports, flange connections, and tension applications in aggressive chemical and high-temperature environments.
Continuous Thread Studs (DIN 976 / ASME B18.31.2)
Incoloy continuous thread studs manufactured to DIN 976, ISO 4014, and ASME B18.31.2 standards. Features continuous threads along the entire length, typically supplied in precision-cut lengths for specific applications. Ideal for heat exchangers, valve assemblies, and structural connections requiring high-temperature capability and corrosion resistance. Precision rolled UNC, UNF, and metric threads for superior fatigue resistance. Available in diameters from M6 to M100 (metric) and 1/4" to 4" (inch) in custom lengths. Supplied with passivated finish per ASTM A967. NACE MR0175 compliant for sour service applications with grades 825 and 925.
Custom & Specialty Threaded Rods
Incoloy custom threaded rods manufactured to customer specifications. Need a special thread configuration, unusual length, or custom end preparation for your extreme environment application? RAYCHIN engineers work with you to produce custom Incoloy threaded rods to your drawing. Options include extra-long lengths up to 6m, special thread classes, and custom end chamfers. Expert heat treatment (solution annealed for 800/825, aged for 925) ensures optimum properties. Manufactured to NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS standards.
Incoloy Grade Selection Guide for Threaded Rods
Incoloy 800 (UNS N08800 / 1.4876)
High-Temperature General Purpose: Nickel-iron-chromium alloy with excellent oxidation and carburization resistance up to 815°C. Good creep strength and resistance to sigma phase embrittlement. Ideal for heat exchangers, furnace components, and petrochemical applications. Minimum tensile strength: 585 MPa, yield strength: 240 MPa.
Incoloy 800H (UNS N08810 / 1.4958)
Enhanced High-Temperature Strength: Higher carbon content (0.05-0.10%) provides improved creep and rupture strength. Excellent performance up to 1150°C. Preferred for applications requiring long-term high-temperature stability such as ethylene furnace tubes and steam generators. Maintains structural integrity at extreme temperatures.
Incoloy 800HT (UNS N08811 / 1.4959)
Optimized High-Temperature Performance: Controlled chemistry with aluminum and titanium additions for enhanced creep resistance. Maximum service temperature up to 1150°C. Superior performance in cyclic temperature applications. Ideal for industrial furnace components, radiant tubes, and high-temperature structural fasteners.
Incoloy 825 (UNS N08825 / 2.4858)
Acid & Chloride Resistance: Nickel-iron-chromium alloy with molybdenum (2.5-3.5%) and copper (1.5-3%) additions. Exceptional resistance to sulfuric and phosphoric acids. Resists 40% H₂SO₄ at 100°C with <0.05mm/year corrosion rate. Ideal for chemical processing, acid storage, and marine applications. Maximum service temperature: 540°C in acid service.
Incoloy 925 (UNS N09925)
Sour Service Specialist: Precipitation-hardenable alloy with titanium additions (1.9-2.4%) providing significantly higher strength through aging. Excellent resistance to sulfide stress cracking in H₂S environments. Yield strength 760-965 MPa in aged condition. Ideal for oil & gas downhole tools, sour gas well equipment, and high-strength corrosion-resistant fasteners. Qualified per NACE MR0175.
Incoloy Threaded Rod Design & Standards
Dimensional Standards
Our Incoloy threaded rods meet or exceed the following specifications:
Standard lengths: 1m, 2m, 3m (metric), 3ft, 6ft, 10ft (inch). Custom lengths available up to 6m (20ft).
Material Specifications by Grade
- Incoloy 800: ASTM B408 / ASME SB408, ASTM B163, ASTM B407
- Incoloy 800H: ASTM B408 / ASME SB408, ASTM B163, ASTM B407
- Incoloy 800HT: ASTM B408 / ASME SB408, ASTM B163, ASTM B407
- Incoloy 825: ASTM B424 / ASME SB424, ASTM B423, NACE MR0175
- Incoloy 925: ASTM B805, API 6A, NACE MR0175
Surface Finish Options
- Passivated: Per ASTM A967 for maximum corrosion resistance
- Electropolished: For clean room and pharmaceutical applications
- PTFE Coated: For anti-galling and lubricity
- As-rolled: Mill finish
Key Benefits of Incoloy Threaded Rods
Exceptional High-Temperature Strength (800 Series)
Incoloy 800H and 800HT maintain useful strength up to 1150°C. At 900°C, tensile strength remains 130-180 MPa, significantly higher than 316H. Excellent creep rupture strength at 1000°C with 20-25 MPa for 1000 hours.
Superior Acid Resistance (825)
Incoloy 825 threaded rods resist 40% H₂SO₄ at 100°C with <0.05mm/year corrosion rate. Excellent performance in phosphoric acid service, including wet process phosphoric acid containing fluoride impurities.
Sour Service Excellence (925)
Incoloy 925 threaded rods offer yield strength up to 760 MPa in aged condition with exceptional resistance to sulfide stress cracking. Qualified per NACE MR0175 for H₂S environments up to 425°C. Ideal for wellhead equipment, valve assemblies, and downhole tools.
Continuous Thread Design
Fully threaded along the entire length, allowing cutting to any required length for custom applications. Provides maximum versatility for field modifications and custom installations in high-temperature and corrosive environments.
Chloride SCC Immunity
With high nickel content (30-46%), Incoloy threaded rods have excellent resistance to chloride stress corrosion cracking, making them ideal for marine environments and brackish water applications.
Long Length Capability
Available in lengths up to 6 meters (20 feet), allowing for continuous runs without joints or couplings. Ideal for long-span applications and custom installations in chemical plants, refineries, and power generation facilities.
Manufacturing Standards for Incoloy Threaded Rods
RAYCHIN LIMITED manufactures Incoloy threaded rods to the following national and international standards, ensuring full compliance for projects worldwide. Both standard and non-standard custom configurations are available.
International Standards & Global Designations for Incoloy Threaded Rods
To serve clients worldwide, RAYCHIN LIMITED manufactures Incoloy threaded rods from material conforming to the following national and international specifications.
UNS N08800 1.4876 UNS N08825 2.4858 UNS N09925 NACE MR0175 API 6A
Chemical Composition (Weight %) – Incoloy Alloys
Our Incoloy threaded rods are produced from melts that strictly conform to the limits below per ASTM standards. The nickel-iron-chromium matrix provides the exceptional high-temperature strength and corrosion resistance characteristic of these alloys.
Incoloy 800 / 800H / 800HT (UNS N08800 / N08810 / N08811)
Incoloy 825 (UNS N08825 / 2.4858)
Incoloy 925 (UNS N09925)
Expert note: The high nickel content provides resistance to chloride stress corrosion cracking. Chromium offers oxidation resistance at elevated temperatures. In 825/925 grades, molybdenum and copper additions provide exceptional resistance to reducing acids like sulfuric and phosphoric acids. Titanium in 925 enables precipitation hardening, achieving yield strengths over 760 MPa. The aluminum and titanium in 800 series contribute to creep resistance at high temperatures.
Complete Mechanical Properties of Incoloy Threaded Rods
Incoloy threaded rods are supplied in the solution annealed condition (800 series, 825) or precipitation hardened condition (925). The data below represent minimum requirements per ASTM standards unless otherwise noted.
Mechanical Properties by Grade
Physical Properties by Grade
Elevated Temperature Properties – Incoloy 800H
Elevated Temperature Mechanical Properties by Grade
Exceptional Corrosion Resistance of Incoloy Threaded Rods
Incoloy alloys offer outstanding resistance to a wide range of corrosive environments, tailored by grade composition.
High-Temperature Oxidation & Carburization Resistance (800 Series)
Incoloy 800 series threaded rods form a stable, adherent Cr₂O₃ oxide layer that provides excellent protection up to 1150°C. Chromium content (19-23%) ensures scaling resistance, while the nickel-rich matrix resists carburization and sigma phase embrittlement. Performance is significantly better than 316L stainless steel at elevated temperatures.
Sulfuric & Phosphoric Acid Resistance (825)
Incoloy 825 threaded rods resist 40% H₂SO₄ at 100°C with corrosion rates <0.05mm/year. The molybdenum and copper additions provide exceptional resistance to reducing acids. Excellent performance in phosphoric acid service, including wet process phosphoric acid containing fluoride impurities.
Sour Service & Chloride SCC Resistance (825, 925)
With high nickel content (>38%), Incoloy threaded rods have excellent resistance to chloride stress corrosion cracking. Incoloy 825 and 925 are qualified per NACE MR0175/ISO 15156 for H₂S environments. Incoloy 925 offers premium resistance to sulfide stress cracking at strength levels up to 760 MPa yield.
Resistance to Specific Environments
Heat Treatment & Microstructural Stability
Incoloy threaded rods are supplied in appropriate heat treated conditions for optimum properties:
- Incoloy 800/825: Solution annealed at 980-1035°C followed by rapid cooling.
- Incoloy 800H/HT: Higher temperature solution anneal (1050-1100°C) for enhanced creep properties.
- Incoloy 925: Supplied in solution annealed or aged condition. Aging at 620-760°C after solution treatment produces precipitation hardening, achieving 760-965 MPa yield strength.
Proper heat treatment ensures the balanced microstructure that provides the exceptional corrosion resistance and mechanical properties characteristic of Incoloy alloys. All threaded rods are fully heat treated and tested to ensure optimal performance.
Special focus: Incoloy Threaded Rods for Critical Applications
For the most demanding applications requiring exceptional high-temperature strength or acid resistance, RAYCHIN offers Incoloy threaded rods manufactured to ASTM, ASME, NACE, and customer-specific specifications. Our capabilities include:
- Chemical Processing: Heat exchanger tie rods, reactor internals, column supports, piping hangers, vessel internals handling acids.
- Oil & Gas / Sour Service: NACE MR0175 compliant Incoloy 825 and 925 threaded rods for wellhead equipment, valve assembly tie rods, subsea structural supports.
- Heat Exchangers & Boilers: Incoloy 800 series threaded rods for high-temperature heat exchanger tie rods, boiler supports.
- Petrochemical Processing: Incoloy 800H and 800HT threaded rods for ethylene furnace supports, reformer tube hangers.
- Power Generation: Incoloy 800 series threaded rods for superheater supports, boiler component hardware, turbine casing tie rods.
- Nuclear Industry: Incoloy 800 threaded rods for steam generator components, reactor system hardware.
- Marine Engineering: Incoloy 825 threaded rods for seawater piping supports, offshore platform structural bracing.
- Aerospace & Gas Turbines: Incoloy 800 series threaded rods for combustion chamber supports, turbine casing tie rods.
- Standards: DIN 975, DIN 976, ISO 4014, ASME B18.31.1M, ASME B18.31.2.
- Thread Classes: 2A, 3A, UNJF-3A, 6g, 6H.
- Sizes: M6 through M100, 1/4" through 4".
- Lengths: Standard 1m, 2m, 3m (metric), 3ft, 6ft, 10ft (inch). Custom lengths up to 6m (20ft).
- Certifications: EN 10204 3.1/3.2 material certifications, NACE MR0175, API 20F, PED 2014/68/EU.
All Incoloy threaded rods are supplied with full traceability and third-party NDT upon request. Custom cutting and packaging available. Supplied with matching Incoloy nuts for complete bolting sets. Material certifications included.
Why RAYCHIN LIMITED – The Incoloy Threaded Rod Authority
Metallurgical competence
Engineers on staff with deep expertise in nickel-iron-chromium superalloys. We ensure proper heat treatment for each grade—solution annealing for 800/825, optimized annealing for 800H/HT, and precise aging for 925—to achieve optimal properties. Every heat is verified by in-house PMI testing to confirm chemistry. Our threaded rods provide the exact balance of high-temperature strength and corrosion resistance required for your application.
Global approvals & traceability
Our quality system is ISO 9001:2015 and AS9100D certified; we also comply with NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN and KS. Full material traceability from melt to final packaging (EN 10204 3.1/3.2). Third-party inspections (ABS, DNV, Lloyds) available. All Incoloy threaded rods meet applicable ASTM, ASME, NACE MR0175, and API standards.
Precision thread rolling & long length capability
In-house CNC thread rolling and cutting capabilities ensure precise thread geometry and consistent mechanical properties. Capable of producing lengths up to 6 meters with consistent thread quality. Precision rolled threads provide superior fatigue life and dimensional accuracy. Available thread classes up to 3A/6g. 100% thread inspection available.
Custom solutions
Need a special thread configuration, unusual length, or custom end preparation for your extreme environment application? Our engineering team works with you to produce custom Incoloy threaded rods to your drawing. We provide specialized surface treatments, passivation, and NACE MR0175 compliant processing per customer requirements.
Contact the Incoloy threaded rod experts today
Request a quote for Incoloy threaded rods, fully threaded rods, continuous thread studs & custom configurations – any global standard (NAS, AN, MS, ANSI, ASTM, ASME, SAE, API, NACE, ISO, DIN, KS), any quantity. Inquire about Incoloy 800, 800H, 800HT, 825, or 925 grades for high-temperature or acid-resistant applications.
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