Duplex Stainless Steel Fastener Manufacturer & Supplier
Industrial Engineering Works manufactures and supplies duplex stainless steel fasteners for demanding industrial applications requiring a combination of high mechanical strength and corrosion resistance. Duplex stainless steels feature a dual-phase ferritic-austenitic microstructure that provides a balance of strength, toughness and resistance to challenging corrosive environments.
Compared with conventional stainless steel grades, duplex and super duplex materials can provide higher strength and enhanced resistance to chloride-related corrosion mechanisms when properly selected for the application.
Our Duplex Stainless Steel Fastener Range
Duplex Stud Bolts
Duplex stainless steel stud bolts are designed for demanding bolted connections where high strength and corrosion resistance are required. They can be supplied in standard and custom dimensions based on application requirements.
Duplex Hex Bolts
Duplex hex bolts provide a durable fastening solution for industrial equipment, piping, structural assemblies and other applications exposed to demanding environmental conditions.
Duplex Heavy Hex Bolts
Heavy hex duplex bolts provide increased bearing surface and robust fastening performance for heavy-duty industrial connections.
Duplex Heavy Hex Nuts
Matching duplex heavy hex nuts can be supplied to create compatible bolting assemblies with the required material and dimensional specifications.
Duplex Threaded Rods
Duplex threaded rods are available in different diameters, lengths and thread configurations for equipment, structural and industrial applications.
Duplex Anchor Bolts
Duplex anchor bolts provide corrosion-resistant anchoring solutions for equipment, structural supports and installations exposed to demanding environments.
Available Duplex Grades
Features & Benefits
Superior Corrosion Resistance
Duplex and super duplex stainless steels offer strong resistance to corrosion in demanding industrial environments.
High Mechanical Strength
Duplex grades provide high mechanical strength, allowing them to be considered for applications where strength and corrosion resistance are both important.
Excellent Resistance to Stress Corrosion Cracking
Properly selected duplex materials can provide strong resistance to stress corrosion cracking in suitable service environments.
Outstanding Pitting & Crevice Corrosion Resistance
Super duplex grades are commonly selected for environments where resistance to localized corrosion is a critical consideration.
Excellent Fatigue Strength
The combination of strength and material properties makes duplex stainless steel suitable for selected applications involving cyclic mechanical loads.
Long Service Life
Appropriate material selection, manufacturing and installation can contribute to long-term fastener performance and reduced replacement requirements.
Specifications
Surface Finishes
Natural Finish
Duplex stainless steel fasteners can be supplied with a natural stainless steel finish where additional coating is not required.
Passivated
Passivation can be provided where specified to support surface condition and corrosion performance requirements.
PTFE Coated
PTFE coatings can be supplied for applications requiring specific friction, release or environmental characteristics.
Xylan Coated
Xylan coatings can be provided when specified for particular operating and performance requirements.
Electropolished
Electropolishing can be provided on request for applications requiring an enhanced surface finish.
Applications
Quality Assurance & Testing
ISO Certified Manufacturing
Manufacturing processes are supported by established quality management procedures.
Material Traceability
Material identification and traceability can be maintained throughout manufacturing and inspection.
Mechanical Testing
Mechanical testing can be performed to verify specified material and performance requirements.
PMI Testing
Positive Material Identification can be performed where required to verify material composition.
Corrosion Testing
Applicable corrosion testing can be arranged based on material grade and project requirements.
Ferrite Content Testing
Ferrite content testing can be performed where required by the applicable specification or customer requirement.
MTC 3.1 / 3.2
Material Test Certificates and inspection documentation can be supplied according to project requirements.
Third-Party Inspection
Third-party inspection can be coordinated when required by the customer, EPC contractor or project specification.
Dimensional Inspection
Critical dimensions, threads and configurations can be inspected against drawings and applicable specifications.
Why Choose Industrial Engineering Works?
Frequently Asked Questions
What are Duplex Stainless Steel Fasteners?
Duplex stainless steel fasteners are bolts, studs, nuts, threaded rods and other fastening components manufactured from duplex stainless steel grades featuring a ferritic-austenitic microstructure. They are selected for applications requiring a combination of high strength and corrosion resistance.
What is the difference between Duplex 2205 and Super Duplex 2507?
Duplex 2205, commonly associated with UNS S31803/S32205, provides high strength and good corrosion resistance for many industrial applications. Super Duplex 2507, UNS S32750, generally provides higher alloy content and enhanced resistance to localized corrosion for more demanding environments.
What are UNS S31803 and UNS S32205?
UNS S31803 and UNS S32205 are designations associated with Duplex 2205 stainless steel. The exact material condition and applicable specification should be confirmed against the project requirements.
When should Duplex Fasteners be used instead of 316 Stainless Steel?
Duplex fasteners may be considered when an application requires higher mechanical strength and enhanced resistance to specific corrosive environments. The final material selection should be based on operating conditions, corrosion exposure, temperature and applicable specifications.
Which industries use Duplex Stainless Steel Fasteners?
Duplex fasteners are used in offshore oil and gas, marine engineering, chemical processing, petrochemical, desalination, power generation and other industrial applications.
What ASTM standards apply to Duplex Fasteners?
Applicable standards can include ASTM A1082 and, where applicable, ASTM A193, ASTM F593 and ASTM F594. The correct standard depends on the product, grade and application requirements.
Are custom sizes and thread forms available?
Yes. Custom duplex fasteners can be manufactured according to customer drawings, specified dimensions, thread forms and project requirements.
Can matching Duplex nuts and washers be supplied?
Yes. Matching duplex nuts and compatible washers can be supplied as part of a complete fastening solution, subject to the specified material and application requirements.
Do you provide EN 10204 3.1 / 3.2 certificates?
Yes, EN 10204 3.1 / 3.2 material and inspection documentation can be provided when required by the customer or project specification.
What coatings are available?
Depending on the application, available options can include natural finish, passivation, PTFE coating, Xylan coating and electropolishing. Coating selection should be based on the required application and project specifications.