US2016340759A1PendingUtilityA1

Brass with improved dezincification resistance and machinability

Assignee: NORDIC BRASS GUSUM ABPriority: Jan 30, 2014Filed: Jan 30, 2015Published: Nov 24, 2016

Est. expiryJan 30, 2034(~7.5 yrs left)· nominal 20-yr term from priority

Inventors:Jan-Olof Nilsson Cato Martinsen Merelid

C22C 9/04C22C 1/02C22F 1/08B22D 21/005C22C 1/03

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References

Claims

Abstract

The present invention concerns an essentially arsenic-free brass alloy with improved (i) dezincification resistance, (ii) machinability, and (iii) protection against intergranular grain boundary corrosion, wherein said brass alloy comprises 62-68% by weight of Cu, 0.02-1.00% by weight of Pb, 0.2-0.6% by weight of P, 0.02-0.06% by weight of Sb, and balance Zn, and the brass alloy being characterized in that it comprises <5% of β-phase, preferably <1%. In addition, the invention concerns a method for the production of said brass alloy.

Claims

exact text as granted — not AI-modified

1 - 17 . (canceled) 
     
     
         18 . A brass alloy comprising:
 a. 62-68% by weight of Cu,   b. 0.02-1.00% by weight of Pb,   c. % by weight of As,   d. 0.01-0.06% by weight of P and/or 0.01-0.06% by weight of Sb,   e. balance Zn and unavoidable impurities,   wherein the brass alloy comprises &lt;5% of β-phase.   
     
     
         19 . The brass alloy according to  claim 18 , further comprising:
 c. 0% by weight of As, and   d. 0.02-0.06% by weight of P and 0.02-0.06% by weight of Sb.   
     
     
         20 . The brass alloy according to  claim 19 , further comprising:
 a. 63.0-64.0% by weight of Cu.   
     
     
         21 . The brass alloy according to  claim 20 , further comprising:
 b. 0.80-1.00% by weight of Pb.   
     
     
         22 . The brass alloy according to  claim 18 , further comprising:
 c. 0% by weight of As, and   d. 0.01% by weight of P and 0.02% by weight of Sb.   
     
     
         23 . The brass alloy according to  claim 18 , further comprising:
 c. 0.01% by weight of As, and   d. 0.02% by weight of Sb.   
     
     
         24 . The brass alloy according to  claim 18 , further comprising:
 c. 0.01% by weight of As, and   d. 0.015% by weight of P and 0.02% by weight of Sb.   
     
     
         25 . A brass alloy comprising:
 a. 62-68% by weight of Cu,   b. 0.02-1.00% by weight of Pb,   c. ≦0.02% by weight of As,   d. 0.01-0.06% by weight of P and/or 0.01-0.06% by weight of Sb,   e. balance Zn and unavoidable impurities,   f. 0.07-0.12% by weight of Fe, and   g. 0-0.70% by weight of Al,   wherein the brass alloy comprises &lt;5% of β-phase.   
     
     
         26 . The brass alloy according to claim  15 , further comprising:
 a. 63.5% by weight of Cu,   b. 0.9% by weight of Pb,   c. 0% by weight of As,   d. 0.02-0.06% by weight of P and 0.02-0.06% by weight of Sb.   e. 35.0% by weight of Zn and unavoidable impurities,   f. 0.10% by weight of Fe, and   g. 0.50% by weight of Al.   
     
     
         27 . The brass alloy according to  claim 26 , further comprising:
 d. 0.03% by weight of P and 0.03% by weight of Sb.   
     
     
         28 . A brass alloy comprising:
 a. 62-68% by weight of Cu,   b. 0.02-1.00% by weight of Pb,   c. ≦0.02% by weight of As,   d. 0.01-0.06% by weight of P and/or 0.01-0.06% by weight of Sb,   e. balance Zn and unavoidable impurities   f. optionally 0.07-0.12% by weight of Fe,   g. optionally 0-0.70% by weight of Al,   h. 0-0.200% by weight of Ni,   i. 0-0.100% by weight of Mn,   j. 0-0.02% by weight of Si, and   k. 0.0004-0.0006% by weight of B,   wherein the brass alloy comprises &lt;5% of β-phase.   
     
     
         29 . A method for the production of a brass alloy according to  claims 18 , comprising the steps of:
 a. adding Sb and/or P to a base alloy in a furnace,   b. the smelt obtained in step a being poured into a mould,   c. the cast brass alloy obtained in step b being heat-treated at 500° C. to 550° C. for 1-2 h.   
     
     
         30 . A method for the production of a brass alloy according to  claim 25 , comprising the steps of:
 a. adding Sb and/or P to a base alloy in a furnace,   b. the smelt obtained in step a being poured into a mould,   c. the cast brass alloy obtained in step b being heat-treated at 500° C. to 550° C. for 1-2 h.   
     
     
         31 . A method for the production of a brass alloy according to  claim 28 , comprising the steps of:
 a. adding Sb and/or P to a base alloy in a furnace,   b. the smelt obtained in step a being poured into a mould,   c. the cast brass alloy obtained in step b being heat-treated at 500° C. to 550° C. for 1-2 h.   
     
     
         32 . Use of the brass alloy according to  claim 18  in environments which contact water. 
     
     
         33 . Use of the brass alloy according to  claim 25  in environments which contact water. 
     
     
         34 . Use of the brass alloy according to  claim 28  in environments which contact water. 
     
     
         35 . An article which is produced with the use of the brass alloy according to  claim 18 . 
     
     
         36 . An article which is produced with the use of the brass alloy according to  claim 25 . 
     
     
         37 . An article which is produced with the use of the brass alloy according to  claim 28 . 
     
     
         38 . Use of P in order to decrease cutting forces of the brass alloy according to  claim 25  in the presence of Al or Fe. 
     
     
         39 . Use of P in order to decrease cutting forces of the brass alloy according to  claim 28  in the presence of Al or Fe.

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