Patent ID: 9470462
Filing Date: 2016-10-18
CPC Classification: B21B,C22C,C23G,F28D,F28F,Y10T

Claim Text:
1. A heat exchanger for heating a hydrochloric acid pickling solution, the heat exchanger comprising: a first tubesheet disposed at a first end of a plurality of the tubes; a second tubesheet disposed at a second end of the plurality of tubes; and a shell surrounding the plurality of tubes, the shell comprising: a tubeside inlet for flowing hydrochloric acid through the first tubesheet and the plurality of tubes; a tubeside outlet for flowing the heated hydrochloric acid from the plurality of tubes and the second tubesheet; a shellside inlet for flowing a heating fluid into the shell to heat the plurality of tubes; and a shellside outlet for flowing the heating fluid out of the shell, wherein at least one tube or at least one tubesheet includes an alloy that comprises niobium and tantalum and wherein the alloy comprises at least 30 weight percent tantalum and at least 25 weight percent niobium.