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PH Stainless Steel butterfly valve

PH Stainless Steel                    
Is a martensitic precipitation/age hardening stainless steel offering high strength and hardness. 17.4 PH withstands corrosive attack better than any of the 400 series stainless steels and in most conditions its corrosion resistance closely approaches that of 300 series stainless steel. 17.4 PH is primarily used as a stem material for butterfly and ball valves.
A705 17-4PH /A564 630: This material is usually used as All Stem, it is suitable for Water,Steam,Air,Oil,etc.