electronic grade high purity gas pipeline
optoelectronics, and biopharmaceutical industries generally use bright
annealing (BA), pickling or passivation (AP), electrolytic polishing (EP),
and vacuum secondary dissolved (VIM + VAR) product, for
high-purity and clean pipeline systems with transmitting sensitive or corrosive
Electro-Polished for short EP. By electrochemical polishing, the surface morphology
and structure can be greatly improved, and the actual area of the surface layer
can be minimized. The surface is a closed, thick chromium oxide film, the
energy is close to the normal level of the alloy, and the number of media will
be reduced to minimum. So it is usually suitable for electronic grade
high purity gases.
Annealing for short BA. High-temperature heat treatment in hydrogenation or
vacuum state, on the one hand, eliminates internal stress, and on the other
hand, forms a passivation film on the surface of the pipeline to improve the
morphological structure and reduce the energy level, but does not increase the
surface roughness. So it is used for GN2 , CDA, and non-process inert gases.
C. Pickled &
Passivated / Chemically Polished for short AP or CP. Pipes that have been
pickled or passivated will not improve surface roughness, but will remove
particles on the surface and reduce energy levels, but will not reduce
the number of interposers. It is usually used as industrial grade pipes.
Induction Melting + Vacuum ArcRemelting is abbreviated as V V. It is a patented
product of Sumitomo Metal. It is processed again under arc and vacuum
conditions, which effectively improves corrosion resistance and surface
roughness . It is usually suitable for highly corrosive and high-purity
electronic grade gases, such as: BCL3, WF6, CL2, HBr, etc.
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