Inconel690 has significant antioxidant properties and excellent stress corrosion resistance. Excellent corrosion resistance to various water media and high-temperature atmospheres. It also has high strength, good metallurgical stability, and excellent processing characteristics.
Carbon C: ≤ 0.050
Chromium Cr: 27-37
Nickel Ni: base
Iron Fe: 7-11
Manganese Mn: ≤ 0.50
Silicon Si: ≤ 0.50
Phosphorus P: ≤ 0.02
Sulfur S: ≤ 0.015
Copper Cu: ≤ 0.5
Inconel690 Physical Performance:
Inconel690 Density: 8.19g/cm3 Melting point: 1344-1377 ℃
Inconel690 Elastic modulus: 211 GPa Thermal conductivity: 12.1 λ/ (W (m ℃)
Inconel690 hardness: HRB85 thermal expansion coefficient (20-100 ° C): 14.0 x10-6K-
Main features of Inconel 690: The nickel based superalloy Inconel 690 has excellent corrosion resistance and thermal stability.
Inconel 690 alloy has excellent corrosion resistance in various aqueous solutions and gas environments. Due to its high Cr content, it exhibits excellent corrosion resistance in many acidic media such as nitric acid and hydrofluoric acid. In hydrochloric acid, it can withstand corrosion at low concentrations (below about 15%), and has high corrosion resistance to phosphoric acid at room and medium temperatures. However, it can only withstand low concentrations of acid in boiling solutions.
The microstructure of Inconel690 alloy tube after solid solution treatment is austenite+a small amount of carbides+a small amount of Ti (CN). When the solid solution temperature is between 950~1100 ℃, the grain size does not change much. When the solid solution temperature exceeds 1150 ℃, the grain size rapidly increases. Therefore, the recommended temperature for solid solution treatment is below 1100 ℃.
After TT treatment, Cr23C6 precipitates along grain boundaries, and its quantity and size increase with the increase of TT treatment temperature and holding time. The distribution morphology changes from single to semi continuous. Over 800 × After 48 hours of treatment, the size significantly increased.
