Specification

  • Chemistry of copper alloys
  • Physical-mechanical properties
  • Cast brass, bronzes

Chemical composition and specifications of copper alloys

Copper alloys are widely used in different industries. Basically all copper alloys can be subdivided into bronzes and brass. Bronzes are copper alloys where main alloying ingredients are tin, aluminum, manganese, silicon, beryllium, iron and other elements. Tin bronzes are those, where main alloying ingredient is tin and tinless bronze (special) is an alligation of copper, aluminum, iron, manganese and nickel.

Chemical composition of cast bronzes
Mark Main components Crud, not more then
Tin Zinc Lead Aluminum Iron Others Copper
Sn Zn Pb Al Fe Cu
БрО5Ц5С5 4-6 4-6 4-6 - - - rest 1,3
БрО8C12 7-9 - 11-13 - - Nickel < 2,0 0,75
БрО8C21 7-9 - 19-23 - - Nickel < 2,0 0,75
БрО10Ф1 9-11 - - - - Phosphor 0,4 – 1,1 1
БрА9Ж3л - - - 8-10,5 2-4 - 2,7
БрА10Ж3Мц2 - - - 9-11 2-4 Manganese 1,0 – 3,0 1
БрА10Ж4Н4л - - - 9,5-11 3,5-5,5 Nickel 3,5 – 5,5 1,5

Brass is an alloy of copper and zinc in which might be also other elements like silicon, aluminum, iron, manganese

Chemical composition of cast brass
Mark Main components Crud, not more then
Copper Aluminum Iron Manganese Lead Silicon Zinc
Cu Al Fe Mn Pb Si Zn
ЛЦ38Мц2С2 57-60 - - 1,5-2,5 1,5-2,5 - rest 2,2
ЛЦ30А3 66-68 2-3 - - - - " 2,6
ЛЦ23А6Ж3Мц2 64-68 4-7 2-4 1,5-3,0 - - " 1,8
ЛЦ16К4 78-81 - - - - 3,0-4,5 " 2,5
ЛЦ14К3С3 77-81 - - - 2-4 2,5-4,5 " 2,3

Physical-mechanical properties of copper alloys

Basic advantage of copper alloys is high corrosion resistance, wear resistance, low friction ratio, heat and electroconductivity, well operated under negative temperature up to – 250C.

Main essential products produced from casting tin bronze are molded pieces, operated under very high pressure and in friction condition.

Casting tinless bronzes are distinguished with high durability, excellent antifriction properties and good corrosive characteristics. This bronzes have some special qualities like very high electroconductivity, thermal conductivity and heat-resistance. They are used in manufacturing parts for working under particularly severe conditions: tooth gear, hubs, valves, gear for extra-high-power cranes and turbine, conveyer screw, bearings for working under high specific pressure and load impacts. Thanks to its special characteristics (large volumetric shrinkage, high oxidation during melting and pouring) this bronzes are essentially used for casting parts with simple shapes.

Aluminum bronze become the most widespread among tinless bronzes. They have a very good corrosion resistance in sweet and salt water, good resistance to destruction in cavitations conditions, and compared to tin bronzes have reduced antifriction wear.

Physical-mechanical properties of casting bronzes
Mark Casting method Ultimate strength σB, (kg/mm2) Elongation per unit length after disruption δS, % Brinell hardness (kg/mm2) Density g/sm3 Friction ratio Pouring temp. С°
not less then With lubrication Without lubrication
БрО5Ц5С5 Sand 147,0 (15) 6 588(60) 8,82 0,0093 0,15 1150 – 1200
Gravity die 176,2 (16) 4 588(60) 8,84
БрО8C12 Sand 147,0 (15) 5 588(60) 9,1 0,005 0,1 1000 – 1040
Gravity die 147,0 (15) 5 637(65)
БрО8C21 Sand 147,0 (15) 5 392(40) 9,3 0,005 0,1 1000 – 1040
БрО10Ф1 Sand 215,5 (22) 3 784(80) 8,58 0,008 0,1 1050 – 1150
Gravity die 245,0 (25) 3 882(90) 8,76
БрА9Ж3л Sand 392,0 (40) 10 980(100) 7,5 0,054 0,18 1120 – 1200
Gravity die 490,0 (50) 12 980(100)
БрА10Ж3Мц2 Sand 392,0 (40) 10 980(100) 7,5 0,063 0,19 1120 – 1200
Gravity die 490,0 (50) 12 1176(120)
Centrifugal 490,0 (50) 12 1176(120)
БрА10Ж4Н4л Sand   5 1568(160) 8,2 0,12 0,23 1120 – 1240
Gravity die 587,0 (60) 6 1668(170)
Centrifugal   5 1568(160)

Physical-mechanical properties of cast brass
Mark Casting method Ultimate strength σB, (kg/mm2) Elongation per unit length after disruption δS, % Brinell hardness (kg/mm2) Density g/sm3 Melting temp. С° Pouring temp. С° Friction ratio Casting shrinkage %
not less then With lubrication Without lubrication
ЛЦ38Мц2С2 Sand 245 (25) 15 80 8,5 880 940- 1080 0,016 0,24 1,8
Gravity die 343 (35) 10 85 1,5-1,6
ЛЦ30А3 Sand 294 (30) 12 80 8,5 995 1055- 1155 - - 1,55
Gravity die 392 (40) 15 90
ЛЦ23А6Ж3Мц2 Sand 686 (70) 7 160 8,5 900 960- 1080 - - 1,8
Gravity die    
Centrifugal 705 (72) 165
ЛЦ16К4 Sand 294 (30) 15 100 8,5 900 960- 1080 0,01 0,19 1,7
Gravity die 343 (35) 110
ЛЦ14К3С3 Sand 245 (25) 7 90 8,6 909 970- 1090 0,009 0,15 1,7

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