Stainless steel material for ship propeller

Abstract

A stainless steel material for a ship propeller includes 14.0-14.8 wt. % chromium (Cr), 5.4-6.0 wt. % nickel (Ni), 1.52-1.98 wt. % silicon (Si), 0.001-0.05 wt. % carbon (C), 0.3-0.7 wt. % manganese (Mn), 2.5-3.5 wt. % copper (Cu), 0.01-1.0 wt. % cobalt (Co) and 0.2-0.3 wt. % niobium (Nb), and the remaining part includes iron (Fe) and unavoidable impurities. This stainless steel material provides relatively better fluidity during casting, conducive to the forming of the ship propeller and raising impact resistance thereof.

What is claimed is: 
     
         1 . A stainless steel material for a ship propeller, which is adapted for manufacturing the ship propeller, the stainless steel material comprising 14.0-14.8 wt. % chromium (Cr), 5.4-6.0 wt. % nickel (Ni), 1.52-1.98 wt. % silicon (Si), 0.001-0.05 wt. % carbon (C), 0.3-0.7 wt. % manganese (Mn), 2.5-3.5 wt. % copper (Cu), 0.01-1.1 wt. % cobalt (Co), 0.2-0.3 wt. % niobium (Nb), and a remaining part comprising iron (Fe) and unavoidable impurities. 
     
     
         2 . The stainless steel material as claimed in  claim 1 , wherein the stainless steel material is obtained by heating alloy comprising chromium (Cr), nickel (Ni), silicon (Si), carbon (C), manganese (Mn), copper (Cu), cobalt (Co), niobium (Nb) and iron (Fe) to a temperature of 1600° C.-1700° C. into a molten iron mixture, then putting the molten iron mixture into a ceramic mold with a temperature of 1100° C.-1150° C., opening the mold after cooling, then performing solution treatment under a temperature of 1050° C.-1100° C. for 1.5 hours, and then performing H1100 precipitation hardening. 
     
     
         3 . The stainless steel material as claimed in  claim 1 , wherein the stainless steel material further comprises up to 0.3 wt. % molybdenum (Mo). 
     
     
         4 . The stainless steel material as claimed in  claim 1 , wherein the stainless steel material further comprises up to 0.05 wt. % vanadium (V). 
     
     
         5 . The stainless steel material as claimed in  claim 1 , wherein the stainless steel material further comprises up to 0.06 wt. % nitrogen (N). 
     
     
         6 . The stainless steel material as claimed in  claim 1 , wherein the stainless steel material further comprises up to 0.04 wt. % phosphorus (P). 
     
     
         7 . The stainless steel material as claimed in  claim 1 , wherein the stainless steel material further comprises up to 0.03 wt. % sulfur(S).