Master alloy for casting a modified copper alloy and casting method using the same

Abstract

An advantage of the invention is to provide a master alloy used in a casting of a modified copper alloy, grains of which can be refined during a melt-solidification, and also a method of casting a modified copper alloy using the same. In order to achieve the advantage, master alloy for casting a copper alloy in a form of Cu: 40 to 80%, Zr: 0.5 to 35% and the balance of Zn; and Cu: 40 to 80%, Zr: 0.5 to 35%, P: 0.01 to 3% and the balance of Zn are used, and thus grain-refined copper alloy casting products are obtained.

1 - 13 . (canceled) 
     
     
         14 . A modified copper alloy casting product, comprising:
 (1) a master alloy consisting of Cu: 40 to 80 wt %, Zr: 1 to 35 wt % and the balance of Zn with inevitable impurities; and   (2) a molten copper alloy comprising P, to which the master alloy is added to provide the modified copper alloy casting product,   wherein, the modified copper alloy casting product has a 0.2% proof strength that is improved by not less than 10% compared to a copper alloy casting before modification and the modified copper alloy casting product comprises 5 to 500 ppm of Zr and 0.01 to 0.35 wt % of P.   
     
     
         15 . A modified copper alloy casting product, comprising:
 (1) a master alloy consisting of Cu: 40 to 80 wt %; Zr: 1 to 35 wt %;   at least one element selected from the group consisting of Mg: 0.01 to 1 wt %, Sn: 0.1 to 5 wt %, B: 0.01 to 0.5 wt. %, Mn: 0.01 to 5 wt % and Si: 0.01 to 1 wt %, and the balance of Zn with inevitable impurities; and   (2) a molten copper alloy comprising P to which the master alloy is added to provide the modified copper alloy casting product,   wherein, the modified copper alloy casting product includes refined grains having a grain size of 50 μm or less when a modified copper alloy casting comprises 5 to 500 ppm of Zr and 0.01-0.35 wt % of P.   
     
     
         16 . A modified copper alloy casting product, comprising:
 (1) a master alloy consisting of Cu: 40 to 80 wt %; Zr: 1 to 35 wt % and the balance of Zn with inevitable impurities,   wherein the master alloy is an ingot formed in a shape of a boat, continuous casting material formed in a shape of a rod or wire, or hot extrusion material formed in a shape of a rod or wire, and   wherein the master alloy has a minimum thickness of 1 mm; and   (2) a molten copper alloy comprising P to which the master alloy is added to provide the modified copper alloy casting product, wherein, the modified copper alloy casting product includes refined grains having a grain size of 50 μm or less.   
     
     
         17 . A modified copper alloy casting product, comprising:
 (1) a master alloy consisting of Cu: 40 to 80 wt %; Zr: 2 to 20 wt % and the balance of Zn with inevitable impurities,   wherein said Zr is present in the form of Cu—Zn—Zr in decreasing order by wt. %,   wherein the master alloy is an ingot formed in a shape of a boat, continuous casting material formed in a shape of a rod or wire, or hot extrusion material formed in a shape of a rod or wire, and   wherein the master alloy has a minimum thickness of 1 mm; and   (2) a molten copper alloy comprising P to which the master alloy is added to provide the modified copper alloy casting product, wherein, the modified copper alloy casting product includes refined grains having a grain size of 50 μm or less.   
     
     
         18 . A modified copper alloy casting product, comprising:
 (1) a master alloy consisting of Cu: 40 to 80 wt %; Zr: 2 to 20 wt %;   at least one element selected from the group consisting of Mg: 0.01 to 1 wt. %, Sn: 0.1 to 5 wt %, B: 0.01 to 0.5 wt %, Mn: 0.01 to 5 wt % and Si: 0.01 to 1 wt %, and the balance of Zn with inevitable impurities,   wherein said Zr is present in the form of Cu—Zn—Zr in decreasing order by wt %,   wherein the master alloy is an ingot formed in a shape of a boat, continuous casting material formed in a shape of a rod or wire, or hot extrusion material formed in a shape of a rod or wire, and   wherein the master alloy has a minimum thickness of 1 mm; and   (2) a molten copper alloy comprising P to which the master alloy is added to provide the modified copper alloy casting product, wherein the modified copper alloy casting product includes refined grains having a grain size of 50 μm or less.   
     
     
         19 . A modified copper alloy casting product, comprising:
 (1) a master alloy consisting of Cu: 40 to 80 wt %; Zr: 2 to 35 wt %; P: 0.01-3 wt % and the balance of Zn with inevitable impurities,   wherein the master alloy is an ingot formed in a shape of a boat, continuous casting material formed in a shape of a rod or wire, or hot extrusion material formed in a shape of a rod or wire, and   wherein the master alloy has a minimum thickness of 1 mm; and   (2) a molten copper alloy to which the master alloy is added to produce the modified copper alloy casting product, including refined grains having a grain size of 50 μm or less.   
     
     
         20 . A modified copper alloy casting product having improved proof strength, comprising:
 (1) a master alloy consisting of Cu: 40 to 80 wt %; Zr: 2 to 35 wt %; and the balance of Zn with inevitable impurities,   wherein the master alloy is an ingot formed in a shape of a boat, continuous casting material formed in a shape of a rod or wire, or hot extrusion material formed in a shape of a rod or wire, and   wherein the master alloy has a minimum thickness of 1 mm; and   (2) a molten copper alloy comprising P to which the master alloy is added to provide the modified copper alloy casting product, wherein a 0.2% proof strength of the modified copper alloy casting is improved by 10% or more compared to a copper alloy casting before modification.   
     
     
         21 . A modified copper alloy casting product having improved proof strength, comprising:
 (1) a master alloy consisting of Cu: 40 to 80 wt %; Zr: 2 to 35 wt %; P: 0.01-3 wt % and the balance of Zn with inevitable impurities,   wherein the master alloy is an ingot formed in a shape of a boat, continuous casting material formed in a shape of a rod or wire, or hot extrusion material formed in a shape of a rod or wire, and   wherein the master alloy has a minimum thickness of 1 mm; and   (2) a molten copper alloy to to which the master alloy is added to provide the modified copper alloy casting product, wherein a 0.2% proof strength of the modified copper alloy casting product is improved by 10% or more compared to a copper alloy casting before modification.   
     
     
         22 . A modified copper alloy casting product having improved proof strength, comprising:
 (1) a master alloy consisting of Cu: 40 to 80 wt %; Zr: 2 to 35 wt %; P: 0.01-3 wt %,   at least one element selected from the group consisting of Mg: 0.01 to 1 wt %, Sn: 0.1 to 5 wt %, B: 0.01 to 0.5 wt %, Mn: 0.01 to 5 wt % and Si: 0.01 to 1 wt %, and the balance of Zn with inevitable impurities,   wherein the master alloy is an ingot formed in a shape of a boat, continuous casting material formed in a shape of a rod or wire, or hot extrusion material formed in a shape of a rod or wire, and   wherein the master alloy has a minimum thickness of 1 mm; and   (2) a molten copper alloy to to which the master alloy is added to provide the modified copper alloy casting product, wherein a 0.2% proof strength of the modified copper alloy casting product is improved by 10% or more compared to a copper alloy casting before modification.