US2013255845A1PendingUtilityA1

Heat treatment method of unleaded brass alloy

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Assignee: PARK KWANG JINPriority: Mar 30, 2012Filed: Mar 30, 2012Published: Oct 3, 2013
Est. expiryMar 30, 2032(~5.7 yrs left)· nominal 20-yr term from priority
Inventors:Kwang-Jin ParkJae Kil ShimYoung Sy HanKyung-Hwan YoonSung Ki Ahn
C22F 1/08
40
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Claims

Abstract

A heat treatment method for unleaded brass alloy is provided to improve processability, cracking resistance, wear resistance and anti-corrosive property of unleaded brass alloy containing no lead or containing a very small amount of lead. The heat treatment method includes full annealing an unleaded brass alloy material, mechanical processing the material after full annealing and soft annealing the material after mechanical processing.

Claims

exact text as granted — not AI-modified
1 . A heat treatment method for unleaded brass alloy, comprising:
 full annealing an unleaded brass alloy material;   mechanical processing the material after full annealing; and   soft annealing the material after mechanical processing,   wherein the full annealing is carried out at a temperature of 530±30° C. and the soft annealing is carried out at a temperature of 330±30° C.; and   the unleaded brass alloy material contains lead in an amount of 0.2 wt % or less.   
     
     
         2 . The heat treatment method according to  claim 1 , wherein the unleaded brass alloy material is naval brass. 
     
     
         3 . The heat treatment method according to  claim 1 , wherein the full annealing is carried out for 3 hours. 
     
     
         4 . The heat treatment method according to  claim 1 , wherein the soft annealing is carried out for 1 hour. 
     
     
         5 . The heat treatment method according to  claim 1 , wherein the full annealing or the soft annealing is carried out in nitrogen atmosphere. 
     
     
         6 . (canceled) 
     
     
         7 . A heat treatment method for unleaded brass alloy, comprising:
 forging an unleaded brass alloy material;   full annealing the material after forging;   mechanical processing the material after full annealing; and   soft annealing the material after mechanical processing;   wherein the full annealing is carried out at a temperature of 530±30° C.; and the soft annealing is carried out at a temperature of 330±30° C., and   the unleaded brass alloy material contains lead in an amount of 0.2 wt % or less.   
     
     
         8 . The heat treatment method according to  claim 7 , wherein the unleaded brass alloy material is naval brass. 
     
     
         9 . The heat treatment method according to  claim 7 , wherein the full annealing is carried out for 3 hours. 
     
     
         10 . The heat treatment method according to  claim 7 , wherein the soft annealing is carried out for 1 hour. 
     
     
         11 . The heat treatment method according to  claim 7 , wherein the full annealing or the soft annealing is carried out in nitrogen atmosphere. 
     
     
         12 . (canceled)

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