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Material:
Mallory 400
Composition:
CuNiCoBe
Standard
Analysis:
(in
percent by weight)
Be 1.8-2.1
Ni+Co 0.2-0.5
Fe 0.1 max.
Cu balance
Standards:
BS 4577 A4/2
DIN 17666,17672
R.W.M.A. Class 4
Description of Material:
A precipitation hardenable Cu-alloy. In the heat-treated condition this
material possesses an extraordinary high degree of hardness and strength with
good electrical and thermal conductivity.
Examples of Application:
Forms for plastics tools, for deep-drawing moulds, for non-ferrous metal
casting, safety tools (non-sparking and non-magnetic), pistons for die-casting
machines, non-magnetizable high-tensile bars, bushes for deep drilling rods
in offshore and onshore sectors, components for precision measuring equipment.
Condition
Hot formed, heat-treated
Hardness
340-380HV
Tensile
Strength
1150N/mm2
min.
0.2%
Yield Strength
900N/mm2
min.
Elongation
3% min.
Module
of Elasticity
135 x 103 N/mm2
Softening
Temperature
3000C
Specific
Weight
8.3g/cm3
Specific
Heat
0.38J/gK
Thermal
Conductivity(heat treated)
105-130 W/mK
Coefficient
of Expansion
17.0 x 10-6 /K
Electrical
Conductivity(heat treated)
12MS/m(20% IACS)
Processing
Information:
Hot
forming
Mallory
400 should be hot formed at 650-8500C.
Cooling is recommended after forming.
Cold forming
This should be carried out in a solution
heat-treated ,quenched condition.
Intermediate annealing for softening should preferably be carried out at approx.
7500C with subsequent cooling.
Heat treatment
To achieve optimum properties
Mallory 400should be solution heat-treated and quenched in water. Depending
on requirements, the material is then age hardened with or without additional
cold forming.
Solution heat treatment
760-8000C
for 15-60 minutes(depending on size).
Age Hardening
315-3400C for 2-3 hours. Air cooling
Water cooling to be avoided.
Machining
Processing is usually carried
out in the solution heat-treated condition. As Mallory 400 has a tendency to
work harden, it is recommended that subsequent machining be carried out below
the work-hardened zone. Processing in the age hardened condition is possible
although a slight change in dimensions can occur. Under these circumstances
it is recommended that pre-machining be carried out in the solution heat-treated
condition and finishing in the age hardened condition.
Mallory 400 can be soft and hard soldered, gas shielded and resistance welded. A clean metal surface is necessary. Soft soldering can be carried out in the age hardened condition, although the material must not exceed 3000C. Hard soldering with silver solder and welding work should be carried out in the solution heat treated state because of the unavoidable high temperature loads. During welding good ventilation and smoke extraction are essential.
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