What Is Haynes and how does it differ from Inconel? Haynes is a company name – in full it is Haynes International Inc and they employ just over a thousand people worldwide; their headquarters are in Kokomo, Indiana but they operate 8 plants around the world. Haynes has an annual reported turnover of around 462.15 million dollars and their business is the production of special metal alloys; mainly steels alloyed with nickel and chromium but also other elements such as cobalt, molybdenum, or tungsten. They mainly specialize in that group of high-tech metals, known as superalloys; which are widely used in the aerospace and oil and gas sectors; on account of their corrosion resistance and high temperature properties.
Haynes International Inc. grew out of the Haynes Stellite Works which Elwood Haynes opened in Kokomo in 1912. Although the Stellite trademark now belongs to another company; Haynes own some registered trade names such as Ultimet and Hasteloy; but, for many of their alloys, they use their company name as a prefix to a recognizable identification number for the alloy.
Rockwell Haynes inconel alloy 718 for example is their product name for an austenitic nickel-chromium-based superalloy that has an identical chemical composition to a competitor’s alloy containing:-
- Ni – nickel
- Cr – chromium
- Fe – iron
- Mo – molybdenum
- Nb – nio bium
- Co – cobalt
- Mn – manganese
- Cu – copper
- Al – aluminum
- Ti – tita nium
- Si – silicon
- C – carbon
- S – sulfur
- P – phosphorus
- B – boron
- all in their specified percentages.
This superalloy composition is identical to one developed by Inco Alloys and given the name Inconel 718 (Inco Alloys and the Inconel trademark now belong to Special Metals Corporation of New Hartford, New York). Other trade names for the 718 inconel alloy include Altemp, Chronin, Nicrofer and Nickelvac 718 and they would all have the above composition and be in accordance with specification ASTM-B-637|ASTM-B-670.
Any One Can be Substituted For Any Other One
Haynes 718 possesses good low temperature properties which make it particularly popular within the Liquefied Natural Gas (LNG) industry for the fabrication of cryogenic storage tanks. The oil drilling sector also uses Haynes 718 for downhole tools and wellhead, “Christmas Tree” components.
Haynes 718 can be supplied in pipe and tube form as well as bar, wire, sheet form and shaped forgings. The majority of superalloys of this kind are purchased through stockists rather than direct from their point of production.
