1. What is Inconel 625?

Inconel 625 is a general-purpose high-temperature corrosion-resistant alloy suitable for extreme corrosion and high-temperature combined conditions. It has an operating temperature range of -253℃ to 980℃ and features high-temperature resistance, corrosion resistance, oxidation resistance, and creep resistance.

2. Freeman Valve's Inconel 625 ball valve has the following advantages:

2.1 Freeman Valve's Inconel 625 ball valve exhibit excellent corrosion resistance to both oxidizing acids (nitric acid, chromic acid) and reducing acids (sulfuric acid, hydrochloric acid), particularly performing exceptionally well under low- and medium-temperature conditions with dilute hydrochloric acid and moderately concentrated sulfuric acid.

2.2 Freeman Valve's Inconel 625 ball valve demonstrate superior resistance to chloride pitting, crevice corrosion, and stress corrosion cracking (SCC) compared to Incoloy 825, allowing them to withstand long-term corrosion from highly chlorinated media such as seawater, brine, and brines.

2.3 Freeman Valve's Inconel 625 ball valve is resistant to sulfide and fluoride corrosion, making them suitable for complex corrosive environments such as acidic oil and gas wells and hydrometallurgical processes.

2.4 Freeman Valve's Inconel 625 ball valve exhibit stable mechanical properties over a wide temperature range. ① Inconel 625 ball valve has a tensile strength of approximately 690 MPa at room temperature in the solution-treated state, with an elongation of ≥30% and excellent toughness; ② Inconel 625 ball valve maintain sufficient strength and creep resistance even at high temperatures of 980℃, and show no risk of brittle fracture at low temperatures down to -253℃; ③ Inconel 625 ball valve do not require aging strengthening, avoiding performance fluctuations caused by aging processes, and exhibit high batch-to-batch material stability;

2.5 Inconel 625 ball valve manufactured by Freeman Valve possess excellent oxidation resistance and heat resistance. ① Inconel 625 ball valve exhibit excellent oxidation resistance in static air below 980℃, forming a dense chromium-nickel oxide film on the surface that resists oxidation corrosion from high-temperature combustion gases; ② Inconel 625 ball valve can withstand instantaneous operating temperatures up to 1090℃; ③ Inconel 625 ball valve demonstrate good resistance to thermal fatigue, able to withstand repeated temperature fluctuations;

2.6 Freeman Valve's Inconel 625 ball valve possess excellent weldability. Inconel 625 ball valve can be welded using conventional processes such as argon arc welding and electron beam welding. The strength and corrosion resistance of the welded joint is essentially the same as the base material. Furthermore, Inconel 625 ball valve require no heat treatment after welding, making them ideal for large-diameter applications;

2.7 Freeman Valve's Inconel 625 ball valve exhibit good radiation resistance. Inconel 625 ball valve demonstrate good resistance to neutron and gamma-ray radiation, with minimal performance degradation after irradiation, making them suitable for the radiation environment of the nuclear industry.

3. The following issues should be noted when using Inconel 625 ball valve:

3.1 Risk to structural stability during long-term high-temperature use: When the temperature exceeds 870℃ for extended periods, niobium may precipitate brittle phases (such as Laves phase) at grain boundaries, leading to a decrease in material toughness and corrosion resistance. Strict control of the upper operating temperature limit is necessary.

3.2 Limited resistance to hot corrosion: In high-temperature gas environments containing sulfur and vanadium (such as exhaust gas from marine diesel engines and flue gas from coal-fired boilers), the resistance to hot corrosion is weak. A protective coating (such as an aluminum-chromium coating) is required for long-term use.