DIN 1725-1 Grade 3.1645 T3 – Premium AlCuMgPb Free‑Cutting Alloy

The material AlCuMgPb is a free-cutting alloy (boring and turning quality). It is the most used aluminum free-cutting alloy. The addition of Pb causes splinter breaking and permits thereby higher cutting velocities and cutting depths with troublefree splinter removal. This material reached in the cold-hardened condition relatively high strength grades (F 34 and/or F 37), hot ageing is not usual, but its corrosion resistance is insufficient. For this reason a surface treatment is necessary for the corrosion protection. The alloy is weldable only under certain conditions. In addition the strength loss within the range of the welding seam, connected with welding, impairs the use of AlCuMgPb in welded structures. Only as bars and pipes standardised (DIN 1747 part of 1 and part of 2 and/or DIN 1746 part of 1 and part of 2). Heat treatment for hardening: solution annealing: 480 to 490 °C quenching in water to 65 °C cold ageing: 5 to 8 d at ambient temperatures Application: For bearing constructions (loaded statically according to DIN 4113), in the apparatus and tank construction for heat exchangers, for compressed gas bottles, technical flow pressed parts, in the automobile engineering for tank and silo trucks, for dump truck hollows, buses, body parts for safety-related parts, wheels, superstructures in mechanical engineering for devices, tools (baseplates, head and stamp retaining plates as well as guide plates), machine tables, hydraulic/pneumatics, shaft couplings (forgings), roller pipes, brake disks and brake drums (with squirted wear course), joining elements (screws according to DIN 267 T 18, rivets) in food industry (including commercial devices), in the building of rail-mounted vehicles for railroad car doors, stroke sun roofs, wheel-center disks, axle box case, car boxes, in shipbuilding (including mechanisms) for the trunk for superstructures, sail masts, equipment for radar, in the mining industry, in the building industry for roller shutter, roll gates, for camping furniture, as metal goods (building fittings, table-ware, reflectors etc.) In mechanical engineering for milling heads for the wood processing, for wheels (toothed belts) as well as for shaft couplings (also flexible).

Properties

General

Property	Temperature	Value	Condition	Related Standards	Shape
Density		2.85 g/cm³	T3	EN 573-3, EN 754
	20.0 °C	2.85 g/cm³	T3	DIN 1725-1, EN 573-3, EN 573-4	Rod, Tube

Mechanical

Property	Temperature	Value	Condition	Related Standards	Shape	Comment
Elastic modulus		72.5 GPa	T3	EN 573-3, EN 754
Elongation		5.0 %	T3	EN 573-3, EN 754		A50
		6.0 %	T3	EN 573-3, EN 754		A100
		7.0 %	T3	EN 573-3, EN 754		A100
	20.0 °C	5.0 %	T3	DIN 1725-1, EN 573-3, EN 573-4	Rod	A10
	20.0 °C	7.0 %	T3	DIN 1725-1, EN 573-3, EN 573-4	Rod
	20.0 °C	8.0 %	T3	DIN 1725-1, EN 573-3, EN 573-4	Tube	A10
	20.0 °C	10.0 %	T3	DIN 1725-1, EN 573-3, EN 573-4	Tube
	20.0 °C	10.0 %	T3	DIN 1725-1, EN 573-3, EN 573-4	Tube	A10
	20.0 °C	12.0 %	T3	DIN 1725-1, EN 573-3, EN 573-4	Tube
Hardness, Brinell	20.0 °C	90.0 [-]	T3	DIN 1725-1, EN 573-3, EN 573-4	Rod
	20.0 °C	100.0 [-]	T3	DIN 1725-1, EN 573-3, EN 573-4	Rod, Tube
Plane-Strain Fracture Toughnes		22.0 - 35.0 MPa·√m				Typical for Wrought 2000 Series Aluminium
Poisson's ratio		0.33 [-]				Typical for Wrought 2000 Series Aluminium
Shear modulus		27.3 GPa	T3	EN 573-3, EN 754
Tensile strength		340.0 MPa	T3	EN 573-3, EN 754
		370.0 MPa	T3	EN 573-3, EN 754
	20.0 °C	340.0 MPa	T3	DIN 1725-1, EN 573-3, EN 573-4	Rod
	20.0 °C	360.0 MPa	T3	DIN 1725-1, EN 573-3, EN 573-4	Tube
	20.0 °C	370.0 MPa	T3	DIN 1725-1, EN 573-3, EN 573-4	Rod, Tube

Thermal

Property	Temperature	Value	Condition	Related Standards	Shape
Coefficient of thermal expansion	20 °C	2.3e-05 1/K	T3	EN 573-3, EN 754
	100 °C	2.3e-05 1/K	T3	EN 573-3, EN 754
	100.0 °C	2.4e-05 1/K	T3	DIN 1725-1, EN 573-3, EN 573-4	Rod, Tube
Melting point		507.0 - 650.0 °C	T3	EN 573-3, EN 754
Specific heat capacity		860.0 J/(kg·K)	T3	EN 573-3, EN 754
	20.0 °C	860.0 J/(kg·K)	T3	DIN 1725-1, EN 573-3, EN 573-4	Rod, Tube
Thermal conductivity		130.0 - 160.0 W/(m·K)	T3	EN 573-3, EN 754
	20.0 °C	116.0 - 168.0 W/(m·K)	T3	DIN 1725-1, EN 573-3, EN 573-4	Rod, Tube

Electrical

Property	Temperature	Value	Condition	Related Standards	Shape
Electrical conductivity	20.0 °C	18000000.0 - 22000000.0 S/m	T3	DIN 1725-1, EN 573-3, EN 573-4, EN 754	Rod, Tube
Electrical resistivity		4.55e-08 - 5.56e-08 Ω·m	T3	EN 573-3, EN 754

Chemical properties

Property	Value	Condition	Related Standards	Shape
Bismuth	0.2 %	T3	DIN 1725-1, EN 573-3, EN 573-4, EN 754	Rod, Tube
Chromium	0.1 %	T3	DIN 1725-1, EN 573-3, EN 573-4, EN 754	Rod, Tube
Copper	3.3 - 4.6 %	T3	DIN 1725-1, EN 573-3, EN 573-4, EN 754	Rod, Tube
Iron	0.8 %	T3	DIN 1725-1, EN 573-3, EN 573-4	Rod, Tube
	0.80 %	T3	EN 573-3, EN 754
Lead	0.8 - 1.5 %	T3	DIN 1725-1, EN 573-3, EN 573-4	Rod, Tube
Magnesium	0.4 - 1.8 %	T3	DIN 1725-1, EN 573-3, EN 573-4, EN 754	Rod, Tube
Manganese	0.1 %	T3	EN 573-3, EN 754
	0.5 - 1.0 %	T3	DIN 1725-1, EN 573-3, EN 573-4	Rod, Tube
Nickel	0.2 %	T3	DIN 1725-1, EN 573-3, EN 573-4, EN 754	Rod, Tube
Silicon	0.8 %	T3	DIN 1725-1, EN 573-3, EN 573-4, EN 754	Rod, Tube
Tin	0.2 %	T3	DIN 1725-1, EN 573-3, EN 573-4, EN 754	Rod, Tube
Titanium	0.2 %	T3	DIN 1725-1, EN 573-3, EN 573-4, EN 754	Rod, Tube
Zinc	0.8 %	T3	DIN 1725-1, EN 573-3, EN 573-4, EN 754	Rod, Tube

Technological properties

Property
Anodizing	Protective: poor
Brazing	friction soldering: sufficient
Corrosion properties	Seawater: poor, weathering: poor
Workability	Bending / Spinning (cold): sufficient / -, Deep drawing / upsetting (Condition) - / sufficient

AA 1370 BUS PLATE® – Premium Heat‑Treated Aluminium Plate for Superior Performance EN 573-3 Grade AW-5005: High-Performance Aluminum Alloy for Marine Applications

Metal