Selection principles, steel standards, therma1 treatment states and permissible stress values of the materials of the pressure parts should be subject to requirements of the GB 150. Thpressure parts used in inflammable, fatal or toxic operating environments should be made of cast iron.
The common parent tube materials include carbon steel Q235B, 20#, 304, 316, copper tube, etc.
The common fin materials include carbon steel, 304, 316, aluminum, etc
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