Lobrodur 18 (LBD 18) – CuNi2Si DIN EN 12163/12167

Lobrodur 18 is a CuNiSi-based curable copper alloy. It is characterised in particular by excellent cold and hot formability, exceptional corrosion resistance, high strength and hardness achievable through tempering (hardening), good sliding properties, wear resistance, insensitivity to stress corrosion, resistance to weather conditions and good electrical conductivity.
The high strength, yield strength and hardness of this product is achieved through a combination of cold work hardening and thermal hardening. As a result, the mechanical properties are highly heat resistant.
These outstanding properties, in particular the heat treatability and the fact that hardening can be carried out without difficulty at the end of the machining process, allow versatile applications in the fields of electrical engineering, plain bearing technology, chemical plant engineering and general mechanical engineering.

Chemical composition (DIN EN 12163:2016-11)

Element	Cu	Ni	Si	Fe*	Mn*	Pb*
Min. [%]	-	1.6	0.4	-	-	-
Max. [%]	Rest	2.5	0.8	0.2	0.1	0.02

Mechanical properties (Guideline values)

Round bars*		Ø 10-40 mm	Ø 45-61 mm	71-110 mm
Yield point R_p0,2	[N/mm²]	≥ 590	≥ 550	≥ 520
Tensile strength R_m	[N/mm²]	≥ 640	≥ 620	≥ 590
Brinell hardness	[HB]	≥ 180	≥ 180	≥ 180
Elongation at fracture A	[%]	≥ 10	≥ 10	≥ 10
Modulus of elasticity E	[kN/mm²]	~ 130	~ 130	~ 130

* Condition: cold drawn/pressed and hardened

Physical properties (Guideline values)

Coefficient of thermal expansion	[10^-6/K]	17	Electrical conductivity	[m/Wmm²]	17
Thermal conductivity	[W/mK]	160	Specific gravity	[kg/dm³]	8.8

Standards

DIN EN 12164/12167	CuZn37Mn3Al2PbSi	ASTM	Alloy C 67400
DIN 17660/17672	CuZn40Al2	BS 2874	CZ 114

Material designation

DIN EN 12163		DIN 17666
Abbreviated designation	Number	Abbreviated designation	Number
CuNi2Si	CW111C	CuNi2Si	2.0855

Forms of delivery

	Range[mm]	Tolerance [mm]	Manufacturing method
Round bars	Ø 10 - 56	h11	drawn
Round bars	Ø 61 - 122	0/+1	pressed

Example uses

Lobrodur 18 is particularly suitable for bearing bushings, valve guide and guide bushings, guide rails, sliding elements, including those for vibrating and oscillating movements, heat-stressed bearings, high strength screws, electrical contact elements subject to wear, relay screws, drop forged parts, catenary clamps, etc.

Machinability

This material offers good cold formability and excellent hot formability. For hot forming, delivery in the pressed form is recommended.
The processing temperature is approximately 880-900°C.
Lobrodur 18 is best machined in the hardened condition. If the parts are to be mechanically processed after forming, it is expedient to carry out thermal hardening after forming and before machining.
The mechanical properties and electrical conductivity increase during hardening. As our stored round bars are already hardened, the parts should not be subject to any further heat treatment.

Lobrodur 18 - Availability

Cold drawn and hardened round bars from Ø 10–102 mm are available from stock.
Round bars from Ø 102–122 mm are available at short notice.
Flat and hexagonal bars are also available at short notice.
Depending on the use can Lobrodur 18 also “suitable for thermosetting” may be delivered.
Ready-to-install parts in accordance with customer drawing.

We will be more than pleased to advise you.

Subject to technical modifications; no responsibility is accepted for the accuracy of this information.

Links

Additional information can be found in this Looser Bronzen catalogue or under download.

Material data sheet
Lobrodur 18
PDF

Open >