... :bright 4 Application :SS wire of spring S.S. 305 Hydrogen Annealed Wire : 1 Grades:Comm diano materials ,201,202,301 ... strands springs,etc 4 Surface:Bright , Acid white,ma. etc 5 Explanation: Using large-scale hydrogen retreat equipment, scientific process, lean for ... gas temperature control, we return the grain size of the hydrogen silk organization more even, the surface quality is more exquisite ...