Product Detail
Hastelloy C4
Brand: A-one Alloy
Original: 0.00

Hastelloy* C4 (UNS N06455)


Hastelloy C4 is a nickel-chromium-molybdenum  alloy which has improved thermal stability. In this alloy, the tungsten was  totally omitted and the iron content was reduced to approximately 1%. The  alloy also contains approximately 0.3% Ti.



Outstanding high-temperature stability;  exhibits good ductility and corrosion resistance after long-time aging at 650  to 1040 °C (1200–1900 °F). Resists formation of grain-boundary precipitates  in weld heat-affected zones, and is suitable for most chemical process  applications in the as-welded condition. Has excellent resistance to  stress-corrosion cracking and to oxidizing atmospheres up to 1040 °C (1900  °F).

Hastelloy C4 has exceptional resistance to a variety of chemical process  environments, including hot contaminated mineral acids, solvents, chlorine,  and chlorine-contaminated media (organic and inorganic, dry chlorine, formic  and acetic acids, acetic anhydride, seawater, and brine). The general  corrosion resistance of Alloy C276 and Alloy C4 was essentially the same in  many corrosive environments, except that in strongly reducing media like  hydrochloric acid, Alloy C276 was better; but in highly oxidizing media, the  opposite was true, that is, Alloy C4 was better. Alloy C4 offers good  corrosion resistance to a wide variety of media including organic acids and  acid chloride solutions. This alloy has found greater acceptance in European  countries in contrast to Alloy C276, which is more widely used and accepted  in the United States.


It has been widely used in the field  of chemical engineering and high temperature environment. Typical application  areas:

l    Flue gas desulfurization system

l    Acid pickling and acid recycling plant

l    Acetic acid and agricultural chemicals production

l    Titanium dioxide production (chlorine method)

l  Electrolytic plating

Equal grades

Hastelloy C-4, NS335, NS3305, 2.4610

Chemical composition  (%)





Forms available  at A-one Alloy

Plate, sheet, strip, bar, wire, rod,  tube, pipe, forging, ring, casting


Plenty of bar and billet in stock. For  orders the delivery of bar and forging is 20 days. Delivery of other products  please confirm with A-one Alloy.

*Hastelloy is the registered trademark name of HaynesInternational, Inc.