EN 1982· Europe

CuSn7Zn4Pb7-C (Rg7)

Leaded gunmetal (Rotguss) for plain bearings and bushes: Rp0.2 120 MPa, Rm 230 MPa sand cast, 260 MPa continuously cast.

Soft matrix with hard inclusions: good emergency running and wear resistance, resistant to seawater. Poor for welding. The casting method is part of the designation: GS sand, GC continuous, GZ centrifugal.

All values

Identity and composition 11
Mechanical 8
Physical 1
Thermal 2
Electrical and magnetic 1
Chemical and durability not yet

Mechanical

Elastic

Modulus of elasticity E

Young's modulus for design.

Condition	Value	Evidence
	98 000–115 000MPa	Single source

Strength

0.2 % proof strength Rp0.2

Minimum 0.2 % proof strength.

Condition	Value	Evidence
	≥ 120MPa	Corroborated

Tensile strength Rm

Ultimate tensile strength. Product standards give a range or a minimum.

Condition	Value	Evidence
	≥ 230MPa	Single source
	≥ 260MPa	Single source

Brinell hardness HB

Resistance to indentation by a hard ball; for castings and bearings.

Condition	Value	Evidence
	≥ 60HB	Single source
	≥ 70HB	Single source

Ductility

Elongation after fracture A

Minimum elongation; depends on gauge length and test direction.

Condition	Value	Evidence
	≥ 15%	Single source
	≥ 12%	Single source

Physical

Density ρ

Mass per unit volume.

Condition	Value	Evidence
	8 800kg/m³	Single source1

Thermal

Coefficient of thermal expansion α

Linear, near room temperature.

Condition	Value	Evidence
	18.5×10⁻⁶ /K	Single source

Thermal conductivity λ

Heat flow through 1 m of material per kelvin of temperature difference.

Condition	Value	Evidence
	64W/(m·K)	Single source

Electrical and magnetic

Electrical conductivity σ

Copper (annealed, 100 % IACS) is 58 MS/m.

Condition	Value	Evidence
	7.5MS/m	Single source

Chemical composition

Show on the periodic table

CuSn7Zn4Pb7-C castings, EN 1982

Element	Applies to	Range %	Evidence
Cu	all thicknesses	81–85	Single source
Sn	all thicknesses	6–8	Single source
Pb	all thicknesses	5–8	Single source
Zn	all thicknesses	2–5	Single source
Ni	all thicknesses	2.00	Single source
Sb	all thicknesses	0.30	Single source
Fe	all thicknesses	0.20	Single source
P	all thicknesses	0.10	Single source
S	all thicknesses	0.10	Single source
Al	all thicknesses	0.010	Single source
Si	all thicknesses	0.010	Single source

Cu includes Ni. Ingots (CB493K) have tighter limits (KMM: Sn 6.2–8.0, Pb 5.2–8.0, Zn 2.3–5.0).

Compare side by side

With any other grade

Sources here are public pages that reproduce EN 1982. For design and acceptance, the standard edition named in your specification and the inspection certificate (EN 10204 3.1) of the delivered product take precedence. Design factors are recommended values; your National Annex may set others.