Tricon Steel & Alloys is the leading Hastelloy Fasteners Supplier and Hastelloy Fasteners Manufacturer, catering to a wide range of industries. From chemical processing and petrochemicals to pharmaceuticals and beyond, these fasteners stand out as the pinnacle choice, exemplifying unparalleled reliability and resilience in critical applications.
Hastelloy Fasteners including Hastelloy Bolts and Nuts and Hastelloy Screws, are specialized fastening components made from Hastelloy a family of corrosion-resistant alloys known for their exceptional strength and resistance to high temperatures, corrosion, and oxidation. These fasteners are widely used in industries where harsh environmental conditions pose significant challenges to conventional materials.
The remarkable corrosion resistance of Hastelloy Fasteners allows them to withstand harsh environments that include acids, alkalis, and chlorides. This makes them highly sought after in the chemical processing, petrochemical, and marine industries. Additionally, these fasteners exhibit outstanding mechanical properties, such as increased toughness and tensile strength. These qualities ensure reliable and consistent performance even under extreme conditions.
At Tricon Steel & Alloys, we offer a broad range of Hastelloy Fasteners, including Hastelloy C276 Fasteners and Hastelloy B3 Fasteners, both of which are known for their excellent resistance to corrosion and oxidation. These fasteners are essential in various critical applications, such as the construction of chemical reactors, heat exchangers, and pipelines, where they provide secure and long-lasting connections. Their ability to maintain structural integrity in aggressive environments makes them indispensable for ensuring safety and reliability in industrial operations.
Testing of Hastelloy Fasteners is crucial to guarantee their quality and performance. Various tests, such as dimensional inspections, mechanical property evaluations (including tensile and hardness tests), and corrosion resistance assessments using methods like salt spray testing, are conducted during manufacturing and before installation. This ensures compliance with industry standards, allowing Hastelloy C276 suppliers in India and Hastelloy C276 manufacturers to deliver top-quality products.
As a trusted Hastelloy Fasteners Exporter, Tricon Steel & Alloys is committed to delivering products that meet the demanding requirements of our clients. Whether you need Hastelloy C276 Fasteners or Hastelloy B3 Fasteners, our products are engineered to perform exceptionally in challenging environments, ensuring long-lasting reliability and durability.
Duplex Steel Fasteners Chemical Composition
Duplex steel fasteners, known for their exceptional corrosion resistance and high mechanical strength, are typically composed of a dual-phase microstructure, combining austenitic and ferritic stainless steels. The common chemical composition of duplex steel fasteners, with the widely used grade Duplex 2205 (UNS S32205), includes:
Chromium (Cr): A crucial element contributing to corrosion resistance, chromium forms a passive oxide layer on the surface of the duplex steel, protecting it from corrosive environments.
Nickel (Ni): Enhances the toughness and ductility of the material, providing high-strength properties.
Molybdenum (Mo): Improves the alloy's resistance to pitting and crevice corrosion, particularly in chloride-rich environments.
Nitrogen (N): Promotes the formation of the austenitic phase, contributing to the overall strength and corrosion resistance of the duplex steel.
Iron (Fe): The base element that forms the matrix of both austenitic and ferritic phases, providing structural integrity.
The specific chemical composition may vary depending on the duplex steel fastener used. Super Duplex 2507 (UNS S32750) is another common grade with an extended chemical composition, typically containing higher amounts of chromium, nickel, molybdenum, and additional elements like tungsten and copper for enhanced corrosion resistance.
These alloying elements collectively result in a duplex steel fastener with a balance of strength, corrosion resistance, and durability, making them ideal for demanding applications in industries such as oil and gas, chemical processing, and marine engineering. Manufacturers need to adhere to international standards such as ASTM or EN to ensure the desired chemical composition and performance of duplex steel fasteners.
Duplex Steel Fastener Mechanical Properties
Duplex steel fasteners exhibit excellent mechanical properties, making them well-suited for a variety of demanding applications. The mechanical properties are influenced by the dual-phase microstructure, combining characteristics of both austenitic and ferritic stainless steels. Commonly, Duplex 2205 (UNS S32205) and Super Duplex 2507 (UNS S32750) are used, and their mechanical properties include:
Tensile Strength: Duplex steel fasteners typically possess high tensile strength, providing the ability to withstand substantial loads without deformation or failure. Tensile strength values for duplex steel fasteners often exceed those of conventional austenitic stainless steels.
Yield Strength: The yield strength of duplex steel fasteners is notable, ensuring resistance to permanent deformation under applied stress. This property contributes to the durability and reliability of fastened components.
Elongation: Duplex steel exhibits good elongation, allowing for some degree of plastic deformation before fracture. This property is crucial in applications where the material may experience bending or forming.
Hardness: Duplex steel fasteners typically have a balanced hardness, offering a combination of toughness and wear resistance. The dual-phase structure contributes to maintaining hardness levels across a range of temperatures.
These mechanical properties make duplex steel fasteners suitable for use in aggressive environments, such as those found in the oil and gas industry, chemical processing plants, and marine applications. Manufacturers adhere to international standards like ASTM or EN to ensure consistent mechanical properties and the overall quality of duplex steel fasteners.
Equivalent Grades of Duplex Fasteners
Duplex fasteners are available in various grades, each with its unique chemical composition and properties. Equivalent grades refer to different international standards or designations that are considered comparable in terms of performance and characteristics. Two widely used grades for duplex fasteners are Duplex 2205 (UNS S32205) and Super Duplex 2507 (UNS S32750). Equivalent grades for these duplex stainless steel alloys can be found in various standards:
ASTM / ASME Standards:
EN Standards:
UNS Designations:
Other Standards:
These equivalent grades provide a reference for users and manufacturers to ensure consistency in material selection and performance across different regions and industries. It's essential to consider the specific requirements of the application and adhere to the appropriate standards when selecting and using duplex fasteners to guarantee compatibility and reliability.
Specification of Duplex Fasteners
Duplex fasteners refer to a category of fastening components specifically engineered from duplex stainless steel, a corrosion-resistant and high-strength alloy. Duplex stainless steel is characterized by its dual-phase microstructure, combining austenitic and ferritic phases. This unique composition imparts excellent mechanical properties, making duplex fasteners suitable for applications demanding both strength and corrosion resistance.
The specifications of duplex fasteners typically adhere to international standards such as ASTM (American Society for Testing and Materials) or EN (European Norm). These standards define the chemical composition, mechanical properties, and other crucial aspects of the fasteners. Common duplex steel fasteners grade include Duplex 2205 (UNS S32205) and Super Duplex 2507 (UNS S32750).
Duplex fasteners find application in industries like oil and gas, chemical processing, maritime, and more, where harsh environmental conditions or aggressive media are prevalent. They are employed in critical areas where conventional materials may succumb to corrosion or mechanical stress.
The specifications of duplex fasteners may cover a range of products, including bolts, nuts, screws, washers, and studs. These fasteners are available in various sizes, threading configurations, and coatings to suit different requirements. The specifications also detail the heat treatment processes, testing methods, and marking requirements to ensure the quality and reliability of duplex fasteners.
Standard | ASTM B574 / ASME SB574 |
Bolt / Screw Size | M3 – M56 | 3/6″ to 2″ | Custom Sizes |
Nuts Size | M3 – M56 | 3/6″ to 2″ | Custom Sizes |
Washers Size | M3 – M56 | 3/6″ to 2″ | Custom Sizes |
Machine Screws Size | M1.6 – M12 |
Self Tapping Screw Size | No.2 – No. 14 |
Length | 3 mm to 200 mm |
Threads | UNF, BSW, BSF, METRIC, UNC, or as required |
Fasteners |
|
Form | Hex, Threading, Square, Round as per Gauge Etc. |
Raw materials Source | JSPL, Mukund Steel, Tata Steel, Dhamm Steel, Usha Martin,etc. |
Threads Configuration | ASME B1.1 2A/3A – 2B/3B Inch Unified Threads and B1.13M 6h-6G Metric Coarse Threads |
Certification | Dual Certified As per ASTM & ASME Codes |
Dimensions | DIN 931, 933, 934, 7991, 976, 125, ASME B18.2.1, B18.3 |
Threads | Unless otherwise specified, the threads shall be rolled or cut and tapped horizontally or vertically |
Test Certificate | as per EN 10204 / 3.1 Manufacturer Test Certificate |
Additional Certifications | PED 97/23/EC Certified, Merkblatt AD 2000 W2 Certified |
Production Process | M24-M100: hot forging , M2-M24: Cold Froging, for custom-made connecting element machining and CNC |
Types | Bolts, Nuts, Stud Bolts, Washers, Threaded Rod, Anchor Fasteners, Eye Bolt, Stud, Cotter Pin, Socket Screw, Fine Fasteners & Spares, Foundation Fasteners, Hexagon Castle Nuts, Hexagon Domed Cap Bolts, Hexagon Thin Nuts etc. |
Cold Forging
This initial process is a cold forging process used to produce a near net shape work billet. An important consideration in cold forging is the tendency for the bar tobolts Manufacturing Process buckle if its unsupported length to diameter ratio is too high. This ratio usually is limited to less than 4:1 but with suitable dies, therefore, cold forging is the most likely production method because bolts have a large head-to-shank ratio, they are longer than 1½ times their diameter, bolts have multiple diameters and finally require a geometrical shap
Thread rolling
The next process applied to the bottom of the work billet is a bulk deformation process known as "thread rolling". This type of cold-forging process is used bolts Manufacturing Processbecause cylindrical can easily have thread applied by rolling the work billet through two dies. The thread rolling process is usually chosen over machining because thread rolling provides higher production rates, more effective material usage, stronger thread due to work hardening and finally better fatigue resistance because the work billet undergoes compressive stresses during the rolling process.
Blackening and Galvanization
The final process induced on the now almost complete bolt is the application of an anti-corrosive layer, to stop oxidation. The usual process is called "blackening"; Either process chemically or physically coats the surface of ferrous metals, creating a strong barrier against humidity and corrosion. Hot Blackening is most popular & common blackening processes:
Hot Blackening
Hot blackening involves dipping the bolt into six different tanks. The bolt is usually "dipped" by automated part carriers for transportation between tanks. These tanks contain, in order, alkaline cleaner, water, caustic soda at 450°C to 500°C and finally the sealant, which is usually crude oil. The caustic soda bonds chemically to the surface of the metal, creating a porous base layer on the bolt.
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Types of Duplex Fasteners
Duplex fasteners come in various types, each designed to serve specific purposes in different applications. The most common types of duplex fasteners include:
Duplex Bolts: These are threaded fasteners with a head and a shank, designed to be used with nuts for fastening two or more components together. Duplex bolts are available in different lengths, diameters, and grades to suit specific requirements.
Duplex Nuts: Nuts are used in conjunction with bolts to create a threaded fastening system. Duplex nuts are designed to provide secure and corrosion-resistant connections in challenging environments.
Duplex Screws: Similar to bolts but typically shorter, screws are threaded fasteners that can be used for a variety of applications. Duplex screws are corrosion-resistant and can be employed in situations where high strength and durability are essential.
Duplex Washers: Washers are flat, thin plates with a hole in the center. They are placed between a nut and a bolt or a screw and the surface it is fastened to. Duplex washers help distribute the load evenly and provide additional protection against corrosion.
Duplex Studs: Studs are fasteners without heads that have threads on both ends. They are often used in situations where a bolt and nut combination may be impractical. Duplex studs provide a robust and corrosion-resistant solution.
Duplex Anchor Bolts: These specialized bolts are designed for anchoring structures to concrete. Duplex anchor bolts provide both high strength and corrosion resistance, making them suitable for applications where stability is crucial.
Duplex Threaded Rods: Threaded rods are long, straight rods with threads along their entire length. They are often used to create custom fastening solutions and are available in various lengths and diameters.
The choice of the specific type of duplex fastener depends on the application requirements, environmental conditions, and the level of corrosion resistance and strength needed. Manufacturers produce duplex fasteners following international standards to ensure their quality and performance in demanding industries such as oil and gas, chemical processing, and maritime applications.
We also supply Hastelloy Fasteners at the best price. You can check our latest Hastelloy Alloy Fasteners price list. Contact Tricon Steel & Alloys today for a best offer & competitive quotation Of Hastelloy Alloy Fasteners.
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