The Home of HASTELLOY® and HAYNES® alloys

Chemical Processing

CP2Haynes International’s alloys have been used to solve corrosion problems in the Chemical Process industry (CPI) for over 75 years and the principal trademark, HASTELLOY® alloy is highly recognizable over the world for quality and high-performance.  In the 1980’s and 1990’s a variety of products were invented and introduced to solve critical industrial problems involving both low temperature and high-temperature corrosion-resistant applications. 

CP1These alloys include C-22®, G-30®, C-2000®, ULTIMET®, G-35®, B-3®, HR-120®, HR-160®, and 230® alloys.  Since the turn of the century additional alloys include C-22HS®, HYBRID-BC1® and HR-235™ were invented and introduced all designed for specific solutions to customer problems.  Throughout the time period a high quality HASTELLOY C-276 and C-4 were also offered to the CPI.


These alloys are used in reactors, agitators, heat exchangers, reboilers, columns, trays, packing, pipework, couplings, valves, pumps, filters, dryers, and thermal oxidizers.  They provide improved performance over stainless steels, super stainless steels and duplex stainless steels in low temperature and high temperature service.


HASTELLOY® C-2000® alloy reactor for pharmaceutical processing

HAYNES® 230® alloy
HAYNES® 230® alloy has the best balance of strength, thermal stability, oxidation resistance, thermal cycling resistance and fabricability of any major high-temperature alloy. Used in gas turbine combustors and other key stationary components. Also used for heat treating and industrial heating applications, and in the chemical/petrochemical process industry and in fossil energy plants. For welding, use 230-W® filler wire.

HASTELLOY® B-3®alloy
HASTELLOY® B-3® exhibits extremely high resistance to pure hydrochloric, hydrobromic, and sulfuric acids. Furthermore, it has greatly improved structural stability compared with previous B-type alloys, leading to fewer concerns during welding, fabrication, and service.
HASTELLOY® C-4 alloy
HASTELLOY® C-4 alloy is he most (microstructurally) stable of the widely used nickel-chromium-molybdenum materials, which are well known for their resistance to many aggressive chemicals, in particular hydrochloric acid, sulfuric acid, and chlorides. This stability means that the alloy can be welded without fear of sensitization, i.e. the nucleation and growth of deleterious, second phase precipitates in the grain boundaries of the weld heat-affected zone (HAZ).

HASTELLOY® C-22® alloy
HASTELLOY® C-22® alloy is one of the well-known and well-proven nickel-chromium-molybdenum materials, the chief attributes of which are resistance to both oxidizing and non-oxidizing chemicals, and protection from pitting, crevice attack, and stress corrosion cracking. Its high chromium content provides much higher resistance to oxidizing media than the family standard, C-276 alloy, and imparts exceptional resistance to chloride-induced pitting, an insidious and unpredictable form of attack, to which the stainless steels are prone.

HASTELLOY® C-22HS® alloy
HASTELLOY® C-22HS® alloy is a versatile nickel-chromium-molybdenum alloy with excellent resistance to both oxidizing and reducing acids and which can be heat treated to obtain very high strength.

HASTELLOY® C-276 alloy
HASTELLOY® C-276 alloy is the first wrought, nickel-chromium-molybdenum material to alleviate concerns over welding (by virtue of extremely low carbon and silicon contents). As such, it was widely accepted in the chemical process and associated industries, and now has a 50-year-old track record of proven performance in a vast number of corrosive chemicals.

HASTELLOY® C-2000® alloy
HASTELLOY® C-2000® alloy is unique among the versatile nickel-chromium-molybdenum materials in having a deliberate copper addition. This provides greatly enhanced resistance to sulfuric acid. It also has a high chromium content, to maximize its resistance to oxidizing chemicals and process streams contaminated with ferric ions and dissolved oxygen.

HASTELLOY® G-30® alloy
HASTELLOY® G-30® alloy is a nickel-chromium-iron material highly resistant to “wet process” phosphoric acid (P2O5).  P2O5 is one of the most important industrial chemicals, being the primary source of phosphorus for agrichemical fertilizers. G-30 alloy is also moderately resistant to chloride-induced localized attack. Furthermore, G-30 alloy is less susceptible to chloride-induced stress corrosion cracking than the stainless steels.

HASTELLOY® G-35® alloy
HASTELLOY® G-35® alloy was developed to resist “wet process” phosphoric acid (P2O5), which is used in the production of fertilizers. Tests in real-world solutions indicate that G-35 alloy is far superior to other metallic materials in this acid. It was also designed to resist localized attack in the presence of chlorides, since this can be a problem beneath deposits in evaporators used to concentrate “wet process” phosphoric acid. Furthermore, G-35 alloy is much less susceptible to chloride-induced stress corrosion cracking than the stainless steels and nickel-chromium-iron alloys traditionally used in “wet process” phosphoric acid.

HAYNES® HR-120® alloy
HAYNES® HR-120® alloy is a high-strength economical alloy, with good resistance to industrial environments. Designed for use in heat treating fixture and industrial heating applications as an upgrade from 330 alloy, 800H alloy and stainless steels. Excellent carburization and sulfidation resistance.

HAYNES® HR-160® alloy
HAYNES® HR-160® alloy has outstanding resistance to sulfidation and other high-temperature aggressive environments. Used in waste incineration, boiler, high-temperature reaction vessel and rotary calciner applications.

HAYNES® HR-235 alloy

HAYNES® HR-235™ alloy has excellent resistance to metal dusting in carbonaceous high-temperature environments.

HYBRID-BC1® alloy
HYBRID-BC1® alloy possesses much higher resistance to hydrochloric, hydrobromic, and sulfuric acids than the nickel-chromium-molybdenum (C-type) alloys, and can tolerate the presence of oxidizing species. The alloy also exhibits extremely high resistance to pitting and crevice corrosion.

ULTIMET® alloy provides many of the corrosion characteristics of the nickel-based HASTELLOY G-type alloys and many of the wear characteristics of the cobalt-based STELLITE alloys, in a single, highly weldable material. It excels under conditions conducive to galling and cavitation erosion.