It has the following characteristics:
1.Excellent corrosion resistance, good stress corrosion resistance, and good processability in very high temperature aqueous media up to 500 °C.
2.It is a general-purpose engineering alloy that is resistant to acid and alkali metal corrosion in both oxidizing and reducing environments.
3.The high nickel content gives the alloy effective resistance to stress corrosion cracking.
4.It has good corrosion resistance in various media, such as sulfuric acid, phosphoric acid, nitric acid and organic acids, alkali metals such as sodium hydroxide, potassium hydroxide and hydrochloric acid solutions.
5.The high overall performance is reflected in the nuclear combustion dissolver with a variety of corrosive media, such as sulfuric acid, nitric acid and sodium hydroxide, all processed in the same plant.
Applications:It is widely used in various industrial fields with a service temperature of no more than 550 °C.
Typical applications are:
Heating pipes, containers, baskets and chains for sulfuric acid pickling plants.
Seawater cooling heat exchangers, marine product piping systems, acid gas environment piping.
Heat exchangers, evaporators, washers, impregnation tubes, etc. in phosphoric acid production.
Air heat exchangers in petroleum refining.
Food Engineering. Chemical processes.
Flame retardant alloys for high-pressure oxygen applications.
Chemical composition of NS141 alloy:
Alloy690 alloy is mainly used in high-temperature and corrosive environments, especially in nuclear power plants and petrochemical industries. It is commonly used in the manufacture of reactor pressure vessels and heat exchangers. In these applications, Alloy 690 has high strength and corrosion resistance to ensure the reliability and long life of the equipment.
Alloy690 Chemical Composition:
Carbon C: 0050, Cr: 27, 37, Ni: Base, Fe: 7, 11, Manganese: Mn: 050, silicon si: 050, phosphorus p: 002, sulfur s: 0015, copper cu: 05。
Alloy690 Physical Property (Annealing):
Density: 819g cm3 (grams cubic centimeters), specific heat: 450joules kg °C (0-100°C) (joules kg Celsius), melting point: 1377-1343°C.
Alloy690 Mechanical Properties:
Tensile strength (mpa) rmn mm2 710.
Yield Strength (MPa) RP02N mm2 310, elongation A5% 35, Brinell hardness (HB) 8.