metal bellows
     1.1) function :sensing pressure and outputting the axial displacement or angle displacement by stretching or contracting
    
     1.2) material :
     alloy: stannum and bronze QSn6.5-0.1, brass H80,
     stainless steel: 1Cr18Ni9Ti, 1Cr18Ni9, 0Cr19Ni9.
    
     1.3)specifications:
    outside diameter from 8—90mm,
     corrugation number and stiffness are from the fable A=(a/n)*N/mm,
     A: bellows stiffness ,
     a: one corrugation stiffness,
     n: corrugation number
    
     1.4) stiffness tolerance: greater precision :+/-10%
    
     1.5)working temperature:
     Bronze alloy QSn6.5-0.1: -60--+100 °C
     Stainless steel 1Cr18Ni9Ti, 1Cr18Ni9, 0Cr19Ni9 : -194--+400 °C
    
     1.6) working media :
     Bronze alloy QSn6.5-0.1, H80 : atmosphere or fresh water
     Stainless steel 1Cr18Ni9Ti, 1Cr18Ni9, 0Cr19Ni9: atmosphere ,fresh water ,nitric acid, phosphoric acid, sodium hydroxide
    
     1.7)special requirement: designing and manufacturing metal bellows according to customer’s requirements.