Differences between Inconel 600 625 and 718 hex bolts and screws fasteners

Differences between Inconel 600 625 and 718 hex bolts and screws fasteners
The main differences between Inconel 600, 625, and 718 hex bolts and screws lie in their strength, corrosion resistance, and ideal applications. Inconel 600 offers moderate corrosion resistance and high-temperature performance, and is commonly used in furnace components. Inconel 625 boasts excellent corrosion resistance, making it particularly suitable for marine environments, and also offers exceptional strength. Inconel 718 is renowned for its superior high strength and high-temperature performance, making it the material of choice for aerospace and other applications requiring extremely high load-bearing capacity.
What is the strength of Inconel 718 bolts?
185-220 ksi
Inconel 718 is twice as strong as its counterpart, Inconel 625, and is renowned for its exceptionally high strength (tensile strength of 185-220 ksi) after age hardening. Inconel 718 bolts maintain their strength even under pressures and temperatures up to 1300°F (700°C).

Inconel 600 Hex Bolts
Hex bolts manufactured using Inconel 600 exhibit excellent mechanical properties, including high strength and good machinability. The high nickel content of Inconel 600 provides excellent corrosion resistance, effectively preventing chloride stress corrosion cracking. Inconel 600 hex bolts also demonstrate excellent resistance to high-temperature oxidation. Furthermore, these ultra-strong hex bolts undergo cold work hardening and strengthening treatments, resulting in extremely high reliability.
Applications of Inconel 600 Hex Bolts
Hex bolts made from Inconel 600 are commonly used in applications requiring extremely high strength and corrosion resistance. These applications include:Sets of six Inconel hex bolts
Heats
Dieselrs
Condensers
Tube sheets
Bubble towers
Plate trays

Inconel 625 Hex Bolts
Inconel 625 superalloy, composed of molybdenum, niobium, nickel, and chromium, combines excellent strength, corrosion resistance, and machinability. The unique elemental composition of Inconel 625 hex bolts enables them to withstand some of the world's most corrosive environments. Furthermore, Inconel 625 hex bolts can withstand extremely strong oxidation and carburizing processes.
Applications of Inconel 625 Hex Bolts
Due to its numerous unique high-end properties, Inconel 625 hex bolts are often used in applications where they withstand high stress in unpredictable environments. Inconel 625 hex bolts are most commonly used in the following industries:
Chemical Processing
Aerospace
Marine Engineering
Nuclear Power

Inconel 718 Hex Bolts
Inconel 718 superalloy is a precipitation-hardening nickel-based alloy designed to exhibit extremely high yield strength, tensile strength, and creep rupture strength at temperatures up to 1300°F. Due to alterations to its atomic structure through heating and quenching processes, Inconel 718 hex screws are stronger than Inconel 625 bolts, and their strength can be further enhanced through cold working processes.
Inconel 718 Hex Bolt Applications
Inconel 718 hex bolts are widely used in high-end industries due to their excellent high-temperature strength properties, maintaining strength and ductility even at extremely high and low temperatures. Inconel 718 alloy hex fasteners, bolts, and screws are commonly used in the following applications:
Chemical processing
Nuclear reactors
Turbine engines
Hydraulic shafts
Natural gas processing
Cryogenic storage tanks
Why Choose Gnee Nickel Alloy (Supplier Example)?
✅ Large stock of Incoloy alloy tubes/bars/plates/fittings/coils, fast shipping.
✅ Factory direct sales, highly competitive prices, excellent value for money.
✅ Comprehensive quality assurance: Material Testing Certificate (MTC), chemical composition certificate, and mechanical property certificate.
✅ Value-added services: slitting, cutting, polishing, surface treatment.
✅ Worldwide shipping, secure and reliable packaging, and provision of export-required documents.
Email: ss@gneemetal.com
Gnee Steel is a supplier of Inconel alloy, offering a wide range of products including: seamless pipe (sizes: 4-219 mm; thickness: 0.5-20 mm); welded pipe (sizes: 5.0-1219.2 mm; thickness: 0.5-20 mm); plates (thickness: 0.1 to 100 mm; width: 10-2500 mm); strips; alloy round bars (diameter: 3-800 mm); flat bars (thickness: 2-100 mm; width: 10-500 mm); hexagonal bars (size: 2-100 mm); wire rods; and extruded profiles. We collaborate with steel mills to provide our customers with Inconel alloy products that meet or exceed numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS standards.
Gnee Steel stocks and sells Inconel, pipes, plates, strips, round bars, flat bars, forged billets, hexagonal steel, wire rods, and extruded profiles. Please feel free to contact us at ss@gneesteel.com for a quote.






