Inconel 625 alloy introduction

Inconel 625 is a nickel-based superalloy developed in the early 1960s. It is known for its strength, light weight and versatility. It has excellent chemical and mechanical properties and is suitable for a variety of applications.

Excellent characteristics of Inconel 625

Inconel 625 fasteners are nickel-chromium-molybdenum alloy fasteners with small amounts of iron and niobium. Its high nickel content provides it with strength, toughness and corrosion resistance. The chromium content is between 20-23%, which has high corrosion resistance, especially to oxidizing media. The molybdenum content is between 8-10%, which increases strength and resistance to pitting and crevice corrosion. The iron content of 5% further strengthens the alloy, while a small amount of niobium helps prevent intergranular cracking after welding.

Strength and corrosion resistance

Inconel 625 fasteners do not require heat treatment to increase strength and can be used in the annealed state. It has excellent tensile strength and corrosion fatigue strength, and is particularly resistant to chloride ion stress corrosion cracking. It has almost zero corrosion to seawater and freshwater, and also shows similar resistance to alkaline media and neutral salts.

Automotive Industry Applications

The automotive industry requires lightweight, high-strength and corrosion-resistant materials. The specific properties of Inconel 625 make it well suited for specific elements in automotive design, including exhaust tailpipes, airbag rupture discs, decoupling elements and oxygen sensors.

Exhaust Tailpipes

Exhaust tailpipes need to withstand corrosive substances such as rain and salt while maintaining a perfect appearance. Inconel 625 fasteners are valuable for their resistance to salt and freshwater corrosion, light weight, strength and corrosion resistance.

Decoupling Elements

Decoupling elements are an important part of the automotive exhaust system, used to reduce vibration, compensate for thermal expansion and reduce potential wear. The stability and wet corrosion resistance of Inconel 625 fasteners make them the preferred accessories for the manufacture of decoupling elements.

Oxygen Sensor (Lambda Sensor)

Also known as an oxygen sensor, an oxygen sensor is a part of the exhaust system that measures the residual oxygen content in the exhaust gas. Inconel 625 screws and nuts are often used to make contact springs for oxygen sensors.

Airbag rupture discs

Airbag rupture discs are designed to rupture at a specific pressure to ensure that the airbag is accurately deployed when needed. Inconel 625 bolts are the preferred accessory for making these discs because of their high temperature resistance.