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Views: 2 Author: Wang Publish Time: 2024-09-27 Origin: Site
Hastelloy C4 is a nickel-chromium-molybdenum alloy with outstanding high temperature stability. It has high ductility and corrosion resistance. It's high temperature resistance up to 1900 °F (1038 °C) makes it suitable for most chemical process application in the "as" welded condition. With its high contents of Chromium and Molybdenum, Hastelloy C4 is able to withstand both oxidizing and non-oxidizing acids, and is resistant to pitting and crevice attacks in the presence of chlorides and other halides. Like other nickel alloys, Hastelloy C4 is ductile, easy to form and weld.
Hastelloy C4 alloy (UNS N06455) is the 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).
Like other nickel alloys, Hastelloy C4 is ductile, easy to form and weld, and possesses exceptional resistance to stress corrosion cracking in chloride-bearing solutions (a form of degradation to which the austenitic stainless steels are prone). With its high chromium and molybdenum contents, it is able to withstand both oxidizing and non-oxidizing acids, and is resistant to pitting and crevice attack in the presence of chlorides and other halides.
Hastelloy C4 corresponds to UNS N06455 in ASME and its chemical composition and mechanical properties are listed in Table 1.2. Hastelloy C4 is a corrosion-resistant nickel-based Ni-Cr-Mo alloy with a single-phase austenitic structure. Due to the high content of Cr and Mo, it is resistant to corrosion in reducing and oxidizing media, and also resists corrosion in mixed oxidation-reduction media. By reducing the content of C, Si and Fe and adding the stabilizing element Ti, resistance to intergranular corrosion is increased. It also has good resistance to pitting corrosion, crevice corrosion and stress corrosion cracking.
Chemical composition | W | Mn | Faith | P | s | Yes | No | co | You | Cr | Mo |
standard value | ≤ 0.015 | ≤ 0.08 | ≤ 3.0 | ≤ 0.04 | ≤ 0.03 | ≤ 1.0 | grant | ≤ 2.0 | ≤ 0.7 | 14.0-18.0 | 14.0 – 17.0 |
Retest value | 0.003 | <0.01 | 1 | <0.002 | 0.002 | <0.01 | 67.28 | 0.03 | <0.01 | 15.7 | 15.58 |
Hastelloy C4 is a highly corrosion-resistant material, standing up well to several corrosive environments, including oxidizing and reducing acid environments. It has superior resistance to pitting, crevice corrosion, and stress cracking. In addition to its resistance to acid and highly corrosive environments, Hastelloy C4 also resists intergranular cracking in welding.
Hastelloy C4 requires careful heat treatment to achieve optimal mechanical properties. The alloy is annealed at 1025°C-1125°C followed by rapid cooling through water or air quenching. The material is then age-hardened by heating to 870°C- 980°C for one hour, followed by water or air quenching.
Hastelloy C4 is classified as a difficult-to-machine alloy due to its high elasticity modulus and work hardening. Therefore, special care must be taken when machining Hastelloy C4. Carbide-cutting tools are recommended to minimize tool wear and prolong tool life. High-speed steel tools are not recommended since they wear quickly.
Careful attention needs to be given when welding Hastelloy C4. The alloy can be readily welded, but the filler material selection is crucial to obtain optimal mechanical properties. TIG welding is the most common method of fusing Hastelloy C4 due to its low-heat input, allowing for successful welding without cracking. Moreover, post-welding heat treatment is required for Hastelloy C4 to reduce residual welding stress and restore mechanical properties.
Hastelloy C4 is a nickel-based superalloy known for its excellent resistance to corrosion, particularly in harsh environments. Here are some common applications:
Chemical Processing: Used in reactors, heat exchangers, and piping systems that handle aggressive chemicals, especially in the petrochemical industry.
Pharmaceuticals: Ideal for equipment in the production of pharmaceuticals due to its resistance to various corrosive substances.
Aerospace: Employed in components that need to withstand high temperatures and corrosive environments.
Pollution Control: Used in flue gas desulfurization systems and other pollution control equipment.
Marine Applications: Suitable for components exposed to seawater and other marine environments.
Its ability to maintain strength and corrosion resistance at high temperatures makes it a reliable choice for these demanding applications.
Hastelloy C4 has become a top choice among industries requiring high-performance alloys due to its unique mechanical and physical properties, exceptional corrosion resistance, and versatility. We have learned how Hastelloy C4 stands out in various applications, from its composition to its mechanical and physical properties. Whether operating in the chemical processing, aerospace, or pharmaceutical industry, Hastelloy C4 offers excellent corrosion resistance to help your equipment last longer and perform better.
