technical requirement

　　●Coaxiality and cylindricity (jump measurement) ≤ 0.05mm

　　●Dynamic balance g2.5

　　●Straightness ≤ 0.05mm

　　●Tightness test: air pressure test 6kg, pressure holding for 3 hours, no leakage

　　●Thickness of chromium plating layer ≥ 120um

　　●Shaft head conditioning hrc27-30

　　●Hardness of chromium plating layer HRC ≥ 62

　　●Surface roughness ras0.02um

　　●The internal flow passage adopts cross convection structure

　　●Provide thermal imaging report when the surface temperature difference is within ± 0.5