... -4V),Gr7,Gr9,Gr12, etc.StandardGB,ASTM, BS,BSW ,ISOAWS A5.16, ASTM B863, ASTM B348, ASTM F67, ASTM F136SpecificationDiameter:0.03-6.0mmSurface TreatmentPolishing ... , Northwest institute of no-ferrous metal research test.-----Chemical composition, Mechanical properties are strictly controlled, making sure that no defects inside the ...