316LSS or Hastelloy, which material is resistant to high temperature and pressure?
Hastelloy B-3
Hastelloy B-3 Product Overview
Hastelloy B-3 is a nickel-based high-temperature alloy composed of nickel, molybdenum, cobalt and other elements, with a nickel content of approximately 65%. Hastelloy B-3 nickel-based alloy material is an improved material based on Hastelloy B-2. It improves the thermal stability of the material, thereby improving the corrosion resistance. At the same time, it improves the hot forming and cold forming properties. In recent years, it has been increasingly used in the production and manufacturing of chemical equipment.
Mechanical properties of Hastelloy B-3 alloy sheet in solid solution state:
As the heating temperature increases, its tensile strength, yield strength, and elastic modulus will decrease, while the elongation, thermal expansion coefficient, thermal conductivity, and specific heat will increase slightly; while as the cold deformation rate increases, its hardness, tensile strength, and tensile strength will decrease. Strength and yield strength increase, and elongation decrease
Hastelloy B-3 Features
1. Hastelloy B3 material has a high elongation, creating favorable conditions for cold forming.
Hastelloy B3 material is harder than austenitic stainless steel and has a greater tendency to work harden, so it requires greater pressure when cold forming or step forming.
2. When the cold forming deformation rate of Hastelloy B3 material is less than 10%, it will not affect the corrosion resistance of the workpiece, but during the welding process, the presence of residual stress may cause hot cracks in the weld. Therefore, for workpieces that need to be welded later, the influence of residual stress should be eliminated as much as possible.
3. Cold forming with severe deformation will increase the yield ratio of Hastelloy B3 material and increase the susceptibility to stress corrosion and cracking. Intermediate and final heat treatment processes are often used.
4. Hastelloy B3 material is very sensitive to oxidizing media and sulfur, phosphorus, lead and other low melting point metals at high temperatures.
Hastelloy B-3 Thermal Stability
Compared with Hastelloy B-2 alloy, the biggest advantage of B-3 alloy is that it can still maintain excellent toughness when exposed to moderate temperatures for a short time. This exposure usually occurs regularly during the heat treatment of the process. B-2 alloy is very susceptible to embrittlement when exposed to temperatures of 700°C for short periods of time, while B-3 alloy exhibits significant resistance to embrittlement and can survive such exposure for up to several hours. This provides great convenience for the alloy to be fabricated into complex components such as forming devices.
Hastelloy B-2 application areas
Hastelloy B-3 alloy can be used in all applications of B-2 alloy. Like B-2 gold, B-3 is not recommended for use in environments where ferric iron salts and divalent copper salts exist, as these salts will quickly cause corrosion damage. When hydrochloric acid comes into contact with iron and copper, it reacts chemically to form ferric iron salts and divalent copper salts.
