IN 1982 CC493K | CuSn7Zn4Pb7

B7 | Bronze Copper Alloy Tin Lead

Available formats: Bars, Tubes, Caps, Plates and Plates.

features

B7 is a tin lead bronze also known as red bronze or leaded gunmetal.

 

The lead content in tin bronze alloys with a high lead content is between 7.00% and 15.00%. These alloys are free cut and retain a favorable thermal conductivity and good lubrication due to the lead content. The C93200 alloy, also called C932, SAE 660, is considered a family workhorse alloy and is widely used in many bearing applications.

 

The closest international standards are ASTM B505 C93200 and RG7 DIN 1705.

 

It has a good relationship between resistance and elongation. It is a semi-hard material resistant to wear, corrosion and sea water. General use.

Applications

CuSnPb alloys are characterized by their excellent anti-friction quality, high pressure resistance, corrosion, vibration and shock. They are recommended when lubrication is poor.

 

Typical applications: Bushings and Bearings with high loads, Presses and mechanical shovels, Connecting Rod Bushings, Pumps, Motors, Automotive and Railway Ind.

Chemical composition

%
Cu
Neither
P
Pb
Sn
Zn
Al
Fe
S
Sb
Others
Si

Min.

81

-

-

6

6,3

1

-

-

-

-

-

-

Max.

85

1

0,15

8

7,5

4

0,005

0,2

0,08

0,35

-

0,005

Chemical composition according to ASTM B505 / B505M-18

features

B7 is a tin lead bronze also known as red bronze or leaded gunmetal.

 

The lead content in tin bronze alloys with a high lead content is between 7.00% and 15.00%. These alloys are free cut and retain a favorable thermal conductivity and good lubrication due to the lead content. The C93200 alloy, also called C932, SAE 660, is considered a family workhorse alloy and is widely used in many bearing applications.

 

The closest international standards are ASTM B505 C93200 and RG7 DIN 1705.

 

It has a good relationship between resistance and elongation. It is a semi-hard material resistant to wear, corrosion and sea water. General use.

Applications

CuSnPb alloys are characterized by their excellent anti-friction quality, high pressure resistance, corrosion, vibration and shock. They are recommended when lubrication is poor.

 

Typical applications: Bushings and Bearings with high loads, Presses and mechanical shovels, Connecting Rod Bushings, Pumps, Motors, Automotive and Railway Ind.

Chemical composition

Element
Min.%
Max. %

Cu


Neither


P


Pb


Sn


Zn


Al


Fe


S


Sb


Others / Alloys


Si

81


-


-


6


6,3


1


-


-


-


-


-


-

85


1


0,15


8


7,5


4


0,005


0,2


0,08


0,35


-


0,005

Chemical composition according to ASTM B505 / B505M-18

International Equivalences

BRONCESVAL
ISO / EN
W Nr / DIN
UNS / CDA
SAE
BS
DIN / ISO
ASTM

B7

CuSn7Pb6Zn4

CC493K

C93200

660

LG4

1705-RG7

B-584-932

Mechanical properties

Tensile strength
(MPa)
Elastic limit
(MPa)
Elongation
(%)
Brinell hardness
(HB)
Observations

241

138

10

65

-

Mechanical properties according to ASTM B505 / B505M-18

International Equivalences

BRONCESVAL B7
ISO / EN CuSn7Pb6Zn4
W Nr / DIN CC493K
UNS / CDA C93200
SAE 660
BS LG4
DIN / ISO 1705-RG7
ASTM B-584-932

Taken from a half radius of the molten bar, do not test apart from the molten bar.

Mechanical properties

Tensile strength (MPa) 241
Elastic Limit (MPa) 138
Elongation (%) 10
Brinell hardness (HB) 65
Observations -

Mechanical properties according to ASTM B505 / B505M-18

General Physical Properties

Melting Point (Liquid) 977 ° C
Melting Point (Solid) 854º C
Density 8.91 gm / cm at 20 ° C
Specific weight 8,91
Electric conductivity 0.07 MegaSiemens / cm at 20 ° C
Thermal conductivity 58.2 W / m at 20 ° C
Thermal expansion coefficient 17.3 · 10 -6 per ° C (20 ° -200 ° C)
Specific heat capacity 377.1 J / kg at 293 ° C
Tension Elasticity Module 100,000 Mpa
Magnetic Permeability * 1

Physical properties provided by CDA

Manufacturing Properties

Welding Excellent
Braised Good
Oxyacetylene Welding Not recommendable
Gas arc welding Not recommendable
Coated Metal Arc Welding Not recommendable
Machinability Classification 70

Manufacturing properties provided by CDA

Formats

  • B7 Bronze Bars
  • B7 Bronze Tubes
  • B7 Bronze Caps
  • B7 Bronze Plates
  • B7 Bronze Plates

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