Incoloy 800/800H/800HT are solid solution nickel chromium iron alloys with small additions of aluminium and titanium to improve corrosion and oxidation resistance.
They are used for high temperature service, where resistance to oxidation and carburisation are required. For optimum stress rupture properties, or for pressure vessel service above 815¡ãC, Incoloy 800H or Incoloy 800HT should be used.
The alloy is capable of remaining stable and maintaining its austenitic structure. Incoloy 800 is primarily used in applications with temperatures up to 1100¡ã F, where alloys 800H and 800HT are normally used in temperatures above 1100¡ã F where resistance to creep and rupture is required.
This superalloy is used in a variety of industries such as aerospace, chemical processing, marine engineering, pollution-control equipment, and nuclear reactors.
The alloy is made up of 50-55% nickel+cobalt (with cobalt limited to 1% max) and 17-21% chromium.
HASTELLOY C276 is a Nickel-chromium-molybdenum wrought alloy that is considered the most versatile corrosion resistant alloy available.
This alloy is resistant to the formation of grain boundary precipitates in the weld heat-affected zone, thus making it suitable for most chemical process applications in an as welded condition.
Alloy C-276 also has excellent resistance to pitting, stress-corrosion cracking and oxidizing atmospheres up to 1900¡ãF. Alloy C-276 has exceptional resistance to a wide variety of chemical environments.
The outstanding and versatile corrosion resistance of INCONEL 625 alloy under a wide range of temperatures and pressures is a primary reason for its wide acceptance in the chemical processing field.
HASTELLOY C276 is one of the few alloys resistant to wet chloride gas, hypochlorite and chlorine dioxide solutions.
625 has outstanding resistance to pitting, crevice corrosion and intercrystalline corrosion.
HASTELLOY C276 has exceptional resistance to strong solutions of oxidizing salts, such as ferric and cupric chlorides.
625 has almost complete freedom from chloride induced stress corrosion cracking.
HASTELLOY C276 is not prone to grain boundary precipitation in the as welded condition and therefore suitable for many chemical process applications.
It has high resistance to oxidation at elevated temperatures up to 1050C.
Incoloy Alloy 800 is widely used in equipment that must have high strength and resistance to oxidation, carburisation and other harmful effects of high temperature exposure.
It is used for components that require exposure to sea water and high mechanical stress.
The sluggish age-hardening response of alloy 718 permits annealing and welding without spontaneous hardening during heating and cooling.
Inconel 718 has become useful in a wide range of applications ranging from manufacturing operations to military equipment and the aerospace industry.
This nickel alloy is used from cryogenic temperatures up to long term service at 1200¡ã F.
One of the distinguishing features of Inconel 718¡¯s composition is the addition of niobium to permit age hardening which allows annealing and welding without spontaneous hardening during heating and cooling.
Other popular nickel-chromium alloys are age hardened through the addition of aluminum and titanium.
This nickel steel alloy is readily fabricated and may be welded in either the annealed or precipitation (age) hardened condition.
These have the advantage of nickel and molybdenum providing resistance against the most reducing environments. The oxidation resistance is also high in these materials due to the addition of the chromium content.
Monel 400 is a nickel-copper alloy (about 67% Ni ¨C 23% Cu) that is resistant to sea water and steam at high temperatures as well as to salt and caustic solutions.
Alloy 625 / Inconel 625 is used for its high strength, excellent fabricability (including joining), and outstanding corrosion resistance.
Alloy 400 is a solid solution alloy that can only be hardened by cold working.
Alloy 625 is generally supplied in the annealed condition, to provide utmost stability during fabrication and subsequent service.
This nickel alloy exhibits characteristics like good corrosion resistance, good weldability and high strength.
Pipelines for gathering sour gas have been built with solid (or clad) INCONEL? 625 alloy and used in seawater heat exchangers in refineries, power plants, and offshore topside services that often need this material.