ALUMOLD-400^®

Reference specification: IS 5626

Brief description

The Alumold® 400 alloy has been optimised to provide good shape stability and high strength properties throughout the plate thickness. Typical applications include blow moulds, thermoforming moulds and injection moulds for small series.

Chemical composition

Alumold® 400 is based on an alloy of the 7000 series.

Physical properties (nominal values)

Density	2.79 g/cm3
Elastic modulus, tensile	72000 MPa
Elastic modulus, compression	73000 MPa
Poisson's coefficient	0.33
Lin. thermal expansion coefficient (20°-100°C)	23.5 10-6 K-1
Thermal conductivity (20°C)	122 W/mK
Specific heat (20°C)	960 J/kg·K
Thermal diffusivity	45.5 10-6 m2/s

Processing methods

Weldability

TIG/MIG welding adapted*	well
repair welding TIG/MIG adapted*	well

filler alloys: AA 5180, AA 4145

*A drop of strength in the proximity of the weld shall be taken into account. The corrosion resistance of the heat affected zone is reduced.

Surface treatments

Anodizing technical/hard	excellent
Anodizing decorative	not suited
Polishing	good
Hard chrome plating	well adapted
Chemical nickel plating	well adapted
Chemical texturing	well adapted

Machinability

• excellent^*

*Plates in Alumold® 400 are supplied in stress relieved condition, either by stretching or by compression. No further thermal treatment is recommended.

Availability

Alumold® 400 rolled plates are available in tempers T651 or T652 in following dimensions:

Thickness (over... to)	Width
	T651	T652
15 - 152.4 mm	1500 mm
152.4 - 203.2 mm	1020 mm	1500 mm
203.2 - 305 mm		1450 mm

(other dimensions on request)

Mechanical strength

Min. tensile properties (Tempers T651 / T652, at ¼-thickness)

Thickness (over... to)	Rm [MPa]	Rp0.2 [MPa]	A50 [%]
15 - 38.1 mm	425	380	9
38.1 - 76.2 mm	415	370	8
76.2 - 127 mm	415	370	7
127 - 152.4 mm	400	350	7
152.4 - 203.2 mm	395	340	6
203.2 - 254 mm	390	330	5
254 - 305 mm	without guaranteed values

Typical strength for various thicknesses

Thickness (over... to)	Rm [MPa]	Rp0.2 [MPa]	A50 [%]	Hardness HB*
15 - 38.1 mm	450	410	12	140
38.1 - 76.2 mm	440	395	11	130
76.2 - 127 mm	440	395	10	130
127 - 152.4 mm	430	380	10	130
152.4 - 203.2 mm	425	370	9	125
203.2 - 254 mm	420	360	9	125
254 - 305 mm	400	340	5	120

*only for information

Tolerances

Plate thickness (over... to...)	Temper	Thickness tolerance	Flatness long.	Flatness transv.
15 - 60 mm	T651	+ 1.8 / - 0 mm	0.2%	0.2%
60 - 80 mm	T651	+ 2.2 / - 0 mm	0.2%	0.2%
80 - 100 mm	T651	+ 3.0 / - 0 mm	0.2%	0.2%
100 - 203.2 mm	T651	+ 3.5 / - 0 mm	0.2%	0.2%
150 - 305 mm	T652	+ 6.0 / - 0 mm	0.4%	0.2%