The birth of Hastaloy C4 alloy can be traced back to the 70s of the 20th century, and it represents a revolutionary breakthrough in the field of corrosive materials. This article will delve into the characteristics, chemical composition, microstructure characteristics and wide application of Hastelloy C4 alloy in different industrial fields.
Superior chemical composition
The Hastaloy C4 alloy is a further improvement on Hastaloy C276 by reducing the carbon and iron content, removing tungsten, and adding the stabilizer titanium to improve the alloy's resistance to intergranular corrosion. These improvements make the C4 alloy better than the previous C-276 alloy in terms of microstructure and thermal stability.
Details of Hastelloy C4 Hastelloy Corrosion Alloy.
Organizational characteristics
The microstructure of C4 alloy is basically similar to that of alloys such as 0Cr16Ni60Mo16W4 and 00Cr16N60Mo16W4, but the number of chromium carbides and intermetallic phases (e.g. phase: Ni, Fe, Co)3(W, Mo, Cr) in C4 alloy is less than that of the aforementioned alloys. This feature makes the C4 alloy even better in the face of harsh environments.
Excellent welding performance
Due to the good weldability and high corrosion resistance of 00Cr16Ni66Mo16Ti alloy, it is very suitable for use in the chemical industry and other fields in the welded state. C4 alloy can be welded using a variety of commonly used welding methods, including TIG, MIG, manual arc welding, etc., without much difficulty. However, care needs to be taken to prevent overheating when using submerged arc welding, and solvents containing carbon or silicon should not be used. For corrosion-resistant uses, acetylene welding is not recommended.
Hot and cold processing and molding properties
Since alloy C4 does not contain tungsten, it has a low resistance to high-temperature deformation, which makes it easier to perform hot work, and at the same time has excellent cold working performance. Its cold forming properties are not much different between the aging state and the solid solution state, and are far better than other Ni-Cr-Mo alloys. This makes C4 alloy ideal for manufacturing a wide range of corrosion-resistant equipment.
Wide range of applications
Hasteloy C4 alloy is mainly used to resist inorganic acids such as hydrochloric acid and sulfuric acid, as well as organic acids such as formic acid, and to resist chlorine and chlorine-containing media, dry chlorine gas and seawater. Due to its excellent resistance to intergranular corrosion, pitting corrosion, and crevice corrosion, C4 alloy is often used to solve localized corrosion problems that other stainless steels and high-nickel corrosion-resistant alloys struggle to deal with. It can be used to manufacture various corrosion-resistant equipment such as pipes, vessels, towers, tanks, reactors, heat exchangers, pumps, valves, etc., providing reliable material solutions for various industrial fields.
In summary, Hastaloy C4 alloy has become one of the indispensable materials in today's engineering field due to its excellent performance and wide range of applications. Its excellent resistance to intergranular corrosion and versatility make it an excellent choice for engineers and manufacturers to drive progress and innovation in a variety of industries.