Special brass 24

Looser Special Brass 24 (LSM 24) – CuZn34Mn3AI2Fe1-C-GS/GZ/GM DIN EN 1982

Looser Special Brass 24 is a very high strength multi-material alloy based on copper, zinc and aluminium with additions of manganese, iron and nickel (formerly called steel bronze). It is suitable for structural parts that are exposed to high surface pressures and low sliding speeds. It is only suitable for use as a bearing material and for spindle nuts with very good lubrication. Not recommended for dynamic loads, e.g. vibrations. In contrast, Looser Special Brass 24 offers high static strength with good elongation. Can be used at temperatures up to 120°C.

Chemical composition (DIN EN 12165:2016-11)

Element	Cu*	Zn	Mn	AI	Fe	Ni	Pb	Sn	Si	Sb	P
Min. [%]	55	-	1	1	0.5	-	-	-	-	-	-
Max. [%]	66	Rest	4	3	2.5	3	0.3	0.3	0.1	0.05	0.03

* inclusive Ni

Mechanical properties (DIN EN 12165:2016-11)

		Centrifugal casting-GZ
Yield point R_p0,2	[N/mm²]	≥ 260
Tensile strength R_m	[N/mm²]	≥ 620
Brinell hardness	[HB]	≥ 150
Elongation at fracture A	[%]	≥ 14
Bending fatigue strength* R_bw	[N/mm²]	± 170
Modulus of elasticity** E	[kN/mm²]	≥ 90

* Guideline value with 10⁸ load cycles and at 20°C / ** Guideline value

The sample bar is removed from the casting in the case of centrifugal castings and continuous castings. The sample position – e.g. lengthwise or crosswise sample – must be agreed between orderer and manufacturer: the values specified in the table apply only to wall thicknesses up to 50 mm for the blank casting. In the case of wall thicknesses over 50 mm, with the wall thickness of the blank casting being the decisive factor, it must be anticipated that the strength and hardness values are lower. This applies in particular to the yield point.
It must not be expected that the strength and hardness values are uniformly high at all points of the casting. In general, the values in the outer layers will be higher than in the core zone.

Physical properties (Guideline values)

Coefficient of thermal expansion	[10^-6/K]	20	Electrical conductivity	[m/Wmm²]	7.5
Thermal conductivity	[W/mK]	57	Specific gravity	[kg/dm³]	8.6

Standards

DIN EN 1982	CuZn34Mn3Al2Fe1-C-GS/GZ/GM	DIN 1709	G/GZ/GK-CuZn34Al2 (G-SoMs F60)
VSM 10810	G-CuZn34Al2FeMn	-	-

Material designation

DIN EN 12165			DIN 1709
Abbreviated designation	Casting Number	Casting method	Abbreviated designation	Number
CuZn34Mn3Al2Fe1-C-GS	CC764S-GS	GS bzw. G	G-CuZn34Al2	2.0596.01
CuZn34Mn3Al2Fe1-C-GM	CC764S-GM	GM bzw. GK	GK-CuZn34Al2	2.0596.02
CuZn34Mn3Al2Fe1-C-GZ	CC764S-GZ	GZ	GZ-CuZn34Al2	2.0596.03

GS = G = Sand casting, GM = GK = Permanent mold casting, GZ = Centrifugal casting

Example uses

Plain bearings with high surface pressures but low sliding speeds (maximum permissible static surface pressure [p] 120 N/mm²). For even higher surface pressures, we recommend Looser Special Brass 27. Slow-running worm wheel rims, spindle nuts, pressure nuts for rolling mills, gear components, valve and control elements, seats and cones.

Mmachinability

Satisfactory machinability, difficult to weld, not suitable for soldering.

Sliding partners

It is essential to use a hardened and finely ground material as the mating material. Good lubrication is required.

Looser Sondermessing 24 - Availability

Centrifuged rings and bushings pre-turned to the rough sizes or contour.

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 Katalog or under Download.

Material data sheet
Looser Sondermessing 24
PDF

Open >