What is Hastelloy C-276 alloy?

 　　Hastelloy C-276 alloy, also known as 00Cr16Ni60Mo16W4 (C-276) alloy domestically, was introduced in 1965 and produced using an out of furnace refining process after 1970 to obtain ultra-low carbon (C ≤ 0.02%) and high purity alloy internal quality. In order to reduce the sensitivity and brittleness of intergranular corrosion after welding and hot forming of Hastelloy C alloy, and overcome the serious disadvantage of requiring solid solution treatment after welding or hot forming, in addition to reducing carbon content, the silicon content in the alloy was also reduced to ≤ 0.08%.

　　Hastelloy C-276 alloy is abbreviated as Hastelloy C-276 alloy in our country, right. What are its organizational characteristics?

　　Let's refer to Hastelloy C-276 alloy as Hastelloy C-276 alloy later. Its characteristics are low carbon and low silicon, and its structural characteristics are the same as Hastelloy C alloy, except for a decrease in the amount of carbides and intermetallic phases in the alloy.

　　How is the corrosion resistance of Hastelloy C-276 alloy?

　　Overall corrosion, generally the corrosion data of Hastelloy C alloy is also applicable to Hastelloy C-276 alloy. And experiments have shown that the corrosion resistance characteristics of Hastelloy C-276 alloy in solid solution state are completely consistent with Hastelloy C alloy.

　　Local corrosion, experiments have shown that the intergranular corrosion sensitivity of Hastelloy C-276 alloy is much lower than Hastelloy C alloy. However, when sensitized at 600-1150 ℃ or cooled after welding, there are still secondary carbides and some intermetallic phases precipitated in this alloy, which still affects the use of Hastelloy C-276 alloy for welding purposes under certain medium conditions.

　　In a 5% FeCl Å+10% NaCl solution, tested at room temperature for 72 hours, Hastelloy C-276 alloy showed no pitting corrosion in either the welded, solid solution, or post weld heat treated states. The crevice corrosion test conducted in 10% FeCl Å showed that Hastelloy C-276 alloy also had good crevice corrosion resistance.

　　How is the welding performance of Hastelloy C-276 alloy?

　　Hastelloy C-276 alloy has good welding performance and can be welded using universal welding methods without special difficulties.

　　How about the cold and hot processing and forming properties of Hastelloy C-276 alloy?

　　Hastelloy C-276 alloy and Hastelloy C alloy have the same cold and hot processing and forming properties.

　　How is the heat treatment performance of Hastelloy C-276 alloy?

　　In the absence of special regulations and requirements, Hastelloy C-276 alloy undergoes solid solution treatment, that is, heating at 1121 ℃ and then quenching. In this state, Hastelloy C-276 alloy has the best comprehensive properties such as corrosion resistance and mechanics.

　　What are the main applications of Hastelloy C-276 alloy?

　　Hastelloy C-276 alloy was introduced in the 1970s, which further reduced carbon, iron, tungsten, and added stabilizing element titanium on the basis of Hastelloy C-276. This further improved the intergranular corrosion resistance of the alloy, making its microstructure and thermal stability better than the aforementioned Hastelloy C-276 alloy, providing conditions for welding and hot forming equipment required for alloy manufacturing.



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