... control 3).Process and the surface work fine stainless steel handrail Namestainless steel handrailStandardASTM A554,A312,A249,A269 and A270Material Grade304, ... / Handrails, Deck railings / Handrails, Porch RailingsTestSquash test, extended test, water pressure test, crystal rot test, heat treatment, NDT Chemical Composition ... %≥30%≥35%≥35%Hardness(HV)<253<253<200<200 stainless steel glass door handle