COMMON VALVE CASTING MATERIALS METALLURGY

Hastelloy C276 (ASTM A 494, Grade CW12MW)

The high-performance Instrumentation Hastelloy C276 Valves have superior resistance to various acids. For instance, the Hastelloy C276 Ball Valves have the ability to resist acids like sulfuric, hydrochloric, hydrofluoric, nitric, and chromic acid. The Hastelloy Ball Valve even has good localized corrosion resistance.

CW12MW is the old original cast Hastelloy C alloy. Its higher carbon limit of 0.12% maximum along with its higher iron and tungsten levels makes this alloy inferior to any of the other grades in corrosion resistance and ductility. CW12MW is not the cast equivalent for UNS N10276.

CW6M

CW6M is the next cast Ni-Cr-Mo alloy developed. It was introduced in 1949 so there is a long, successful history for this alloy. While it does have higher allowable carbon and silicon limit than the newer C types listed below, it is typically made with much lower carbon and silicon levels, thus giving it good corrosion resistance to both oxidizing and reducing acids.

CW2M

CW2M is the cast equivalent of UNS N06455 developed in 1976 to provide better metallurgical stability than UNS N10276 at high temperatures. An added benefit was that it is a better cast grade than CW12MW. Its improved performance over CW12MW was a result of reduced amounts of intermetallic phases in its microstructure. This was accomplished by lowering its carbon, silicon, iron, chromium, and molybdenum levels and eliminating the tungsten addition.

CX2MW

CX2MW is the cast equivalent of UNS N06022. This alloy has a higher chromium content, but a lower molybdenum content than the other Hastelloy C-type alloys. The higher chromium content does give this alloy better corrosion resistance to hot oxidizing environments such as bleach and chlorinated brines. However, the lower molybdenum content sacrifices some resistance to reducing services where these alloys are also commonly used, e.g., sulfuric and hydrochloric acids.

CX2M

CX2M is the cast equivalent to UNS N06059. It has slightly higher chromium and molybdenum than CX2MW. The higher chromium can provide good resistance to strong oxidizing services and its higher molybdenum content can provide good resistance to sulfuric and hydrochloric acids.

UNS N06200

UNS N06200 (Hastelloy C-2000) is the newest C-type alloy, but it is only available as a wrought component because its extremely low carbon and silicon content means it’s not beneficial for making a cast alloy. UNS N06200 contains a chromium content similar to UNS N06022, but it has more molybdenum along with a small amount of copper. The higher molybdenum content along with the copper gives the alloy better resistance to reducing acids like sulfuric and hydrochloric.

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