Gunmetal Casting
Gunmetal is also known as Red brass. It is a type of bronze – an alloy of copper (88%), tin (10%), and zinc (2%). Originally used chiefly for making guns, gunmetal was eventually superseded by steel. Gunmetal casts and machines well and is resistant to corrosion from steam and salt water and is used to make steam and hydraulic castings, valves, and gears, and also statues and various small objects, e.g. buttons. It has a tensile strength of 221 to 310 MPa, a specific gravity of 8.7, a density 8,719 kg/m3, and a Brinell Hardness of 65 to 74. Gunmetal can also mean steel treated to simulate gunmetal bronze. Bushings made of this metal are used in machinery.

Specification of Gunmetal Casting

Material

Metal

Dimensions

Customized

Sample

Available

Size

Customized

Type

Bushes

Shape

Round

Finish

Polished

Usage

Industrial

Physical Properties of Gunmetal Casting

Grade B.S. 1400: 1985

Nominal Composition

2% PS N/mm Min

Tensile Strength N/mm Min

Elongation % Min

Brinell Hardness Min

G1/BC3

88/10/2

-

245

15

-

G1/BC2

88/8/4

-

245

20

-

LG1

88/3/9/5

85

180

15

-

LG2

85/5/5/5

90

200

13

60

LG3

86/7/5/2

-

-

-

-

LG4

88/7/2/3

130

230

14

65

BC1

82/3/10/5

-

165

15

-

BC6

85/5/5/5

-

215

18

-

Chemical Composition of Gunmetal Casting

Copper Alloys

CU

SN

PB

ZN

FE

NI

P

AL

SI

Impurities

PB-1 Standard : BS 1400

PB 1

Rem

10 Min

0.25

0.05

0.1

0.1

0.5 Min

0.01

0.02

0.6

PB-2 Standard : BS 1400

PB 2

Rem

11-13

0.5

0.3

0.15

0.5

0.15 Min

0.01

0.02

0.2

PB-4 Standard : BS 1400

PB-4

Rem

9.5 Min

0.75

0.5

-

0.5

0.4 Min

-

-

0.5

Phosphorus Bronze IS : 28 - 1985 Grade - 1 Standard : IS : 28 - 1985

Phosphorus Bz (Grade- 1)

Rem

6 - 8

0.25

0.5

0.3

0.7

0.3 - 0.5

0.01

0.2

1.2

Phosphorus Bronze IS : 28 - 1985 Grade - 2 Standard : IS : 28 - 1985

Phosphorus Bz (Grade - 2)

Rem

10 Min

0.25

0.5

0.1

0.1

0.5 Min

0.01

0.02

0.6

Phosphorus Bronze IS : 28 - 1985 Grade - 3 Standard : IS : 28 - 1985

Phosphorus Bz (Grade - 3)

Rem

6.5 - 8.5

2 - 5

2

-

1

0.3 Min

-

-

0.5

Phosphorus Bronze IS : 28 - 1985 Grade - 4 Standard : IS : 28 - 1985

Phosphorus Bz (Grade - 4)

Rem

9 - 11

0.25

0.05

0.05

0.25

0.15

-

-

0.8

Phosphorus Bronze IS : 28 - 1985 Grade - 5 Standard : IS : 28 - 1985

Phosphorus Bz (Grade - 5)

Rem

11 - 13.1

0.5

0.5

0.3

0.5

0.15 Min

-

-

0.2

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