Precision-Engineered Inconel Alloy 625® Studbolts

Inconel Alloy 625®: Information, Composition & Properties for Studbolts

Inconel Alloy 625® (UNS N06625) is a high-performance nickel-chromium-molybdenum superalloy engineered for exceptional strength and superior corrosion resistance across a broad temperature spectrum, from cryogenic levels up to 1000°C (1832°F). Unlike many other alloys, Inconel 625® derives its high tensile and yield strength from the solid-solution strengthening effect of molybdenum and niobium within its nickel-chromium matrix, eliminating the need for complex precipitation-hardening heat treatments. This unique metallurgical structure makes it an ideal material for studbolts used in critical assemblies that must maintain structural integrity under extreme pressure and temperature cycles.

Composition:

The chemical composition of Inconel 625® is primarily defined by a high nickel content (minimum 58%), which provides excellent resistance to chloride-ion stress corrosion cracking. Significant additions of chromium (20-23%) ensure protection against oxidizing environments, while molybdenum (8-10%) and niobium/tantalum (3.15-4.15%) work together to stiffen the alloy’s matrix, providing high mechanical strength and exceptional resistance to pitting and crevice corrosion. Minor elements such as iron (maximum 5%), manganese, and silicon are also precisely controlled to maintain the alloy’s renowned weldability and fabricability.

Properties:

• Outstanding Corrosion Resistance: Inconel 625® provides superior defense against a wide range of corrosive media, including seawater, brackish water, and aggressive mineral acids like hydrochloric and nitric acid.
• High-Temperature Stability: It maintains high fatigue and creep-rupture strength at elevated temperatures, resisting oxidation and carburization where standard stainless steels would fail.
• Excellent Mechanical Performance: With a typical tensile strength of approximately 930 MPa and yield strength of 517 MPa, these studbolts offer a high strength-to-weight ratio for safety-critical applications.
• Versatility in Extreme Conditions: The alloy is non-magnetic and exhibits excellent toughness and ductility even in cryogenic environments, making it a versatile choice for aerospace, marine, and nuclear engineering.

Why Inconel Alloy 625® is ideal for Studbolts:

The combination of exceptional mechanical strength and nearly universal corrosion resistance makes Inconel 625® an essential choice for studbolts in high-integrity fastening applications. These components are particularly vital in offshore oil and gas drilling, chemical processing plants, and marine propulsion systems where exposure to highly acidic or chloride-rich environments is common. By using Inconel 625® studbolts, industries can ensure long-term reliability and minimize the risk of fastener failure in environments characterized by massive stress, high pressure, and severe corrosive attack.

At West Special Fasteners, we take pride in every Inconel Alloy 625® Studbolt we produce, no matter the application.

99% on-time delivery

At West Special Fasteners, we deliver precision-engineered fasteners with a proven 99% on-time delivery record, ensuring your projects stay on schedule. With lead times as short as 4 weeks for full-service orders, we provide unmatched reliability for industries where timing is critical.

• Minimise delays – Receive your special fasteners exactly when needed, helping you avoid costly project interruptions.
• Support critical operations – Our dependable delivery is essential for sectors like defence, offshore, and renewables, where timing is non-negotiable.
• Boost project efficiency – Reliable deliveries streamline your workflow, allowing you to focus on execution without supply chain concerns.
• Maintain your reputation – Trust in our punctuality to ensure your commitments to your clients are met, every time.
• Transparent communication – Realistic timelines and proactive updates at every stage.
• Efficient production – Our advanced facilities and streamlined processes enable us to deliver on time, even for complex and bespoke projects.

Our ability to always deliver on time sets us apart in the fastener industry. While with many competitors you can face frequent delays, we ensure your orders are delivered with precision and professionalism – backed by our fully traceable production process and industry-leading expertise.