| 摘要 |
#CMT# #/CMT# Production of a heat exchanger comprises hot dip refining a steel sheet (1) forming a corrosion protection layer (3) containing zinc and 05.-60 % aluminum, removing the protection layer from one side of the sheet, producing a heat exchanger tube from the sheet, preparing ribs (6) made form aluminum or aluminum alloy, preparing a flux, preparing a solder material containing aluminum and silicon in the joining region between the ribs and the outer side of the exchanger tube (2) and joining the tube with the ribs in a hard soldering step using soldering material and the flux. #CMT#USE : #/CMT# For cooling steam in a power station. #CMT#ADVANTAGE : #/CMT# A solid connection between the ribs and heat exchanger tube is produced even at high temperatures. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawings show cross-sections through the wall of the heat exchanger tube. 1 : Steel sheet 2 : Heat exchanger tube 3 : Corrosion protection layer 4 : Outer surface 6 : Ribs #CMT#METALLURGY : #/CMT# Preferred Features: The ribs are partially cladded with the solder material. Non-cladded ribs are soldered in the solder gap between the ribs and heat exchanger tube by introducing the solder material. |
