... present,foreign countries areusing lnconel 690 alloy tube as a heat pipe, its research and development,prepatation and engineering application of technology ... generator,the use of each inconel 690 “U”-type heat pipe is about 55 tons,more than 4,000 the number ... an excellent,stable performace,the same batch small differences in heat pipe performance.4,from Germany to introduce an eight-headband-type ...