Plate of a plate heat exchanger, a plate heat exchanger made of these plates and use of this plate heat exchanger

Abstract

The present invention relates to a plate of a plate heat exchanger, said plate comprising a material which constitutes a part of said plate with a surface made of this material positioned to be in direct contact with a chloride-containing cooling liquid, such as sea water, in which the material is a duplex stainless steel alloy containing in weight-%: C max 0.06%, Si max 1.5%, Mn 0-3.0%, Cr 23.0-32.0%, Ni 4.9-10.0%, Mo 3.0-8.0%, N 0.15- 0.5%, B 0.-0.010%, S max 0.030%, Co 0-3.5%, W 0-3.0%, Cu 0- 2.0%, Ru 0-0.3%, Al 0-0.2%, Ca 0-0.010% balance Fe and normal occurring impurities, wherein the ferrite content is 35-70 volume-%.

Description

technical field [0001] The present invention relates to plates of plate heat exchangers comprising a material forming part of said plates and having a surface made of this material positioned in direct contact with a cooling liquid containing chlorides, such as sea water, and to a Chloride liquids such as seawater are used as cooling medium for plate heat exchangers. Background technique [0002] In different plants, such as different types of machines, power conversion stations, etc. located by the sea or on offshore platforms, it is necessary to use chloride-containing liquids in the form of sea water as cooling medium in heat exchangers for cooling purposes in these plants. Due to the extremely corrosive environment created by seawater, the use of seawater in these heat exchangers places high demands on the materials used. [0003] The phenomenon of crevice corrosion constitutes a major problem in plate heat exchangers using seawater as cooling fluid, since it may not be...

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Problems solved by technology

However, titanium is a very expensive material and it is not readily available, making it unavoidable that buyers sometimes have to wait for delivery on the order of more than a year, regardless of the source of funds.

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