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Views: 9 Author: Wang Publish Time: 2024-07-09 Origin: Site
Hastelloy C4 2.4610 is nickel-chromium-molybdenum alloy with outstanding high-temperature stability as evidenced by high ductility and corrosion resistance even after aging in the 1200 to 1900ºF. Hastelloy C4 alloy can be forged, hot-upset and impact extruded. Although the alloy tends to work-harden, it can be succesfully deep-drawn, spun, press formed or punched. And, C4 alloy is solution heat-treated at 1950ºF (1066ºC) and rapid quenched.
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. With its high chromium and molybdenum contents, it can withstand both oxidizing and non-oxidizing acids, and is resistant to pitting and crevice attack in the presence of chlorides and other halides. This Nickel-Chromium-Molybdenum alloy tolerates high temperatures and gives a design freedom in areas where weld geometry makes excessive heat build-up unavoidable. Resistance to general and localised corrosion and stress corrosion cracking is generally similar to Hastelloy C-276.
Hastelloy C4 alloy is a member of the Hastelloy family, known for its excellent corrosion resistance and high temperature stability. JN is Hastelloy B2, B3, C22, C4, C276, C2000, X, G30 alloy supplier and manufacturer, our hastelloy alloys meet ASTM, ASME, DIN, BS, GOST, JIS, GB standards. Products include plates, bars, forgings, pipe fittings, flanges, prefabricated pipes, etc.
2.4610 Hastelloy C4 main chemical composition include nickel, molybdenum, chromium, and a small amount of carbon, silicon, iron and tungsten.
Among them, nickel as a basic composition, gives the C4 alloy good toughness and high temperature strength;
Molybdenum and chromium improve the corrosion resistance of the alloy, especially in reducing and oxidizing media;
Low carbon, silicon, iron and tungsten are the differences between C4 and other Hastelloy alloys, which make the alloy show excellent stability in the high temperature range of 650-1040℃.
In terms of microstructure, Hastelloy C4 alloy is a stable austenite structure, which can maintain excellent mechanical properties and corrosion resistance at high temperatures. In addition, the trace elements and heat treatment process in the alloy refine the grain structure and reduce the defects at the grain boundaries, thereby improving the overall performance of the alloy.
The Hastelloy C-4 chemical composition is in the following table:
Composition | Value (%) |
Chromium, Cr | 14-18 |
Molybdenum, Mo | 14-17 |
Iron, Fe | 3 max |
Cobalt, Co | 2 max |
Manganese, Mn | 1 max |
Titanium, Ti | 0.7 max |
Silicon, Si | 0.08 max |
Phosphorus, P | 0.04 max |
Sulfur, S | 0.03 max |
Carbon, C | 0.015 max |
Nickel, Ni | Remainder |
Hastelloy C4 has an outstanding high-temperature stability, excellent resistance to aggresive aqueous environments and good weldability. It can be seen as a more stable and better weldable variant of Alloy C276. Thermal stability and weldability - Hastelloy C4 displays good ductility and corrosion resistance after long-time aging at 650 to 1040°C.
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.
Forging: Hastelloy C4 can be processed by hot forging and cold forging. The temperature range of hot forging is 1150-950℃, and the temperature range of cold forging is 760-870℃.
Heat treatment: Hastelloy C4 can be heat treated by solution treatment and aging treatment. The solid solution treatment temperature is 1150-900℃ and the aging treatment temperature is 760℃. 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.
Cold working: Hastelloy C4 in the work-hardened state of tensile strength and yield strength are high, so it is suitable for cold working, such as cold rolling, cold drawing and so on.
Corrosion resistance: Hastelloy C4 has excellent corrosion resistance in acids, alkalis, salts and other media, especially in chlorine-containing media corrosion resistance is more prominent. 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.
Mechanical properties: Hastelloy C4 has a high yield strength and tensile strength, other mechanical property indicators including elongation, impact toughness. 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.
Performance: Hastelloy C4's main advantage is its excellent corrosion resistance and resistance to thermal oxidation, but also has good mechanical properties and processability.
Welding: Hastelloy Welding material grades for Hastelloy C4 include ERNiCrMo-7 and ENiMo-7. 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 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.
Hastelloy C4 is used in various industries, including chemical processing, aerospace, power generation, petrochemical, pharmaceuticals, and marine applications. This alloy suits sulfuric acid, hydrochloric acid, and acetic acid applications. It is commonly used in chemical reactors, heat exchangers, furnace components, and catalyst support grids.
Hastelloy C4 (UNS N06455) "equivalents" requires matching its specific composition, properties, and certifications.
| Standard | Equivalent Grades | Designation |
| UNS | N06455 | UNS N06455 |
| EN | NiCr16Mo16Ti | 2.4610 / NiMo16Cr16Ti |
| ISO | NiCr16Mo16 | ISO 6207: NiCr16Mo16 |
| GOST | ХН65М16ВТБ (KhN65M16VTB) | GOST 5632-2019 |
| JIS | NW 6415 | NW 6415 |
Hastelloy C4 (UNS N06455) has no universal identical substitute, but NiCr16Mo16Ti (2.4610) is its direct EN counterpart. For functional replacement:
Use C-22 for severe oxidizing acids.
Choose C-276 for broader acid mixes if post-weld heat treatment is feasible.
Chemical Composition:
C4 has a higher nickel content and lower iron content than C276. Its main feature is ultra-low contents of carbon and silicon.
C276 has lower nickel but contains tungsten, which C-4 lacks. It also has slightly higher iron and silicon. Chromium and molybdenum compositions are very similar in both alloys.
Resistance to Different Corrosion Types:
C4 excels in reducing acid environments, particularly hot hydrochloric acid. Its very low carbon/silicon makes it highly resistant to chloride stress corrosion cracking and gives it superior stability in welded sections.
C276 offers broader overall corrosion resistance. It performs better than C-4 in oxidizing acids and is significantly more resistant to pitting and crevice corrosion in chloride-rich environments due to its tungsten content and higher PREN.
Welding and Thermal Stability:
C-4 is specifically designed for as-welded stability. Its low carbon/silicon minimizes harmful carbide precipitation in the heat-affected zone. This is crucial for parts undergoing repeated heating and cooling cycles without needing post-weld heat treatment.
C-276 generally requires solution annealing after welding. Without this, the heat-affected zone can become more prone to attack, especially in highly corrosive conditions, due to potential carbide formation during welding.
Performance at High Temperatures:
C4 is best suited for service temperatures up to about 400°C. Its strength drops faster above this point.
C276 retains its strength at significantly higher temperatures, largely due to its tungsten content. Hastelloy c276 is preferable for high-heat applications.
Typical Applications:
Use C4: The application involves welded equipment exposed to hot reducing acids, particularly below 400°C, like chemical reactors, heater tubes, pipes for HCl service.
Use C276: The application involves mixed acids, oxidizing conditions, high chloride levels, or higher temperatures. It's a versatile "workhorse" for flue gas desulfurization systems, waste treatment, pulp & bleach plants, and seawater heat exchangers, especially if post-weld heat treatment is feasible.
JN is a Chinese Hastelloy C4 Round Bar, Plate, Tube, Pipe Fittings, Forgings, Flange Manufacturer and Distributor, we provide one-stop service, high quality products, preferential prices. Export to 40+ countries, internationally certified Hastelloy supplier. Welcome to learn more about nickel alloys.
