C276 flange Hastelloy N10276 plate bar 276 forging steel plate for desulfurization and deacidification.

N10276 was the first wrought, nickel-chromiummolybdenum material to alleviate concerns over welding (by virtue of extremely low carbon and silicon contents). As such, it was widely accepted in the chemical process and associated industries, and now has a 50-year-old track record of proven performance in a vast
number of corrosive chemicals.
Like other nickel alloys, it 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 exhibits outstanding resistance to pitting and crevice attack in the presence of chlorides and other halides. Furthermore, it is very resistant to sulfide stress cracking and stress corrosion cracking in sour, oilfield environments.

Chemical Composistion

Physical properties

‌The performance of Hastelloy C276 plate at different temperatures is as follows‌:

‌High Temperature Stability‌: Hastelloy C276 shows excellent solid solution stability in high temperature environments, and its phase transition temperature mainly involves the stability of the γ phase. The alloy exhibits good solid solution stability below 1000°C (1832°F), allowing it to maintain its significant mechanical properties and corrosion resistance in high temperature environments‌

‌Pre-change Temperature‌: Hastelloy C276 typically has a pre-change temperature of 700°C (1292°F) under prolonged high temperature exposure. Above this temperature, the material may undergo phase changes that affect its properties. Therefore, special attention needs to be paid to the operating temperature range of the material when designing applications‌

‌Intergranular corrosion and thermal sensitization zone‌: Hastelloy C276 is very sensitive to intergranular corrosion under certain external conditions. Especially after long-term aging in the range of 650 to 1090°C, carbides or carbides will precipitate at the grain boundaries. The accompanying production of intermetallic compounds leads to the depletion of chromium and molybdenum, resulting in intergranular corrosion in some media‌

‌Mechanical Properties‌: Hastelloy C276 has an elastic modulus of 210 GPa (30,000 ksi) and a yield strength of 690 MPa (100,000 psi) at room temperature. These performance parameters allow it to maintain good shape stability in high pressure and high temperature environments. ‌

Advantages of Hastelloy C276

• Excellent corrosion resistance in reducing environments
• Exceptional resistance to strong solutions of oxidizing salts, such as ferric and cupric chlorides
• High nickel and molybdenum contents providing good corrosion resistance in reducing environments
• Low carbon content which minimizes grain-boundary carbide precipitation during welding to maintain resistance to corrosion in heat-affected zones of welded joints
• Resistance to localized corrosion such as pitting and stress-corrosion cracking
• One of few materials to withstand the corrosive effects of wet chlorine gas, hypochlorite and chlorine dioxide

Applications of Hastelloy C276

• Pollution control stack liners, ducts, dampers, scrubbers, stack-gas reheaters, fans and fan housings
• Flue gas desulfurization systems
• Chemical processing components like heat exchangers, reaction vessels, evaporators, and transfer piping
• Sour gas wells
• Pulp and paper production
• Waste treatment
• Pharmaceutical and food processing equipment