Characteristics of inconel vs stainless steel

INCONEL alloy 625,  UNS N06625is a nickel-chromium-molybdenum alloy that is used due to its high strength, excellent fabricability and weldability, and exceptional corrosion resistance property. The outstanding and versatile corrosion resistance of Inconel alloy 625 under a wide range of temperatures and corrosive environments is the primary reason for its wide acceptance in chemical processing, petrochemical and other industries. Here’s a recount of each and every one of these characteristics of inconel.

Strength of inconel alloy 625 is resultant from the hardening effect of molybdenum and niobium on its nickel-chromium matrix.

Cost between Inconel & stainless steel

Inconel is almost 8 times costly than stainless steel. For example, exhaust valves for fast cars cost $150 more than stainless. Availability of Inconel alloy is in the forms of flat sheets, pipes, tubes, flat bars, wire and other shapes. They  show production of 25 qualities of Inconel. Each product has different characteristics and a different price.

The important difference is the weight; iconel is lighter, and corrosion resistance. Though the corrosion resistance is only an issue if you plan to store your jewelry in an acid bath.

inconel vs stainless steel hardness

Inconel alloys are used in enviroments where there are chances of stainless steels getting corroded or dissolved. Probably one of thier widest applications is in the exhaust systems of high performance machinces such as aircraft. it’s worthwhile to consider that Inconels also do not lose thier hardness when exposed to higher temperatures compared to stainless steel which is why it makes them ideal.

On top of these things Stainless steel line or wire retains the round shape created on the reel whereas Inconel remains straight even after unwound.

Inconel vs. stainless steel temperature

When we are talking about the teperature, Inconel products provide strength and corrosion resistance in high temperatures. sea-water applications, aerospace and automotive engineering industries use Inconel alloys for electrical resistance heating, thermal processing, heat treatment and electronics. mooring cables, propeller blades for motor patrol gunboats, submarine auxiliary propulsion motors, submarine quickdisconnect fittings, exhaust ducts for Navy utility boats, sheathing for undersea communication cables, submarine transducer controls, and steam-line bellows. Not only that, the chemical and petrochemical industries also use Inconel. INCONEL alloy 625 may be used for reactor-core and control-rod components in nuclear water reactors.

inconel vs stainless steel exhaust

The purpose of designing of an exhaust system is a trade off between engine performance, casing, accessible materials and the fabrication techniques. 

While exhaust is used in almost all engines to maintain the temperature inside the vehicle’s system and every type of exhaust has its own challenges to sustain in the higher temperatures. In most of the formula racing car series such as motorsport as Formula-1, Le Mans series, Touring cars, Moto GP, etc.

 the packaging area around the engine is very stiff where specialist tooling is needed to create the hard-to-achieve transition shapes.

To make sure the strength in the exhaust system is sufficient, the  materials of the highest strength and corrosion resistance are in demand to make the thicker wall around engine assembly, ultimately making it heavier.

Eventually, because of the power in these nickel alloys it is found that a light weight but stronger exhaust system is the end result.

inconel vs stainless steel corrosion

There are 2 types of corrosions namely (1) aqueous and (2) high temperature corrosion.

Uniform corrosion, sometimes also called general corrosion, is a type of corrosion attack that is uniformly distributed and proceeds at approximately the same rate over the entire metal surface. Tests are designed to evaluate the resistance of alloys to uniform corrosion mainly to aid in the selection of materials.

Aqueous Corrosion The high alloy content of inconel alloy 625 enables it to withstand a wide variety of severe corrosive environments.

Environments like fresh and sea water, neutral salts, and alkaline media there is almost no attack. In the combination of nickel and chromium provides resistance to oxidizing chemicals, whereas the high nickel and molybdenum contents supply resistance to nonoxidizing environments.

The high molybdenum content also makes this alloy very resistant to pitting and crevice corrosion, and niobium acts to stabilize the alloy against sensitization during welding, thereby preventing subsequent intergranular cracking. The high nickel content provides freedom from chloride ion stress corrosion cracking. This blend of characteristics makes inconel alloy 625 useful over a broad spectrum of corrosive conditions.

For example, for a storage tank to handle chemical wastes, including hydrochloric and nitric acids – chemicals which represent directly opposite types of corrosion problems. Materials which resist either one of these acids are normally severely attacked by the other.

Inconel 718 vs stainless steel 316

Inconel 718 is mostly used in the applications for making dies, die holders. For instance, circular, rectangular die  shapes required for rectangle, circle extrusion, Inconel 718 is often the best choice of engineers, since it shows very good hot strength compared to commonly used hot work stainless steels 316.

Jet engine components to plastic injection mold tools, this is where Inconel 718 fits in. It is a precipitation hardenable nickel-chromium alloy with 50% Nickel, 18% Cr, Mo, Co, and Fe balance.

The room temperature properties for these are significantly improved over 304 and 316 SS grades toughness and durability and high temperature properties are needed.