CONTINUOUS CASTING a BRASSES
The full range of alloys from around 10 wt% zinc to 35 wt% zinc cast
without the form of strip, rod and hollow section.
CONTINUOUS CASTING a-B BRASSES
The a-B brasses, generally in the range 57 to 61 wt% copper, are again
continuous difficulty in the form of strip, rod and hollow section, over a
wide range with the a brasses the casting temperature should be controlled
to round 100°-150° C above the liquidus to minimise zinc losses.
Free Machining a-B brasses
The addition of lead in the range 1 to 3 wt % to the a-{3 brasses is made
to improve machinabilit. Lead, being practically insoluble in brass in the
solid state, separates out in small isolated globules uniformly distributed
throughout the structure. The microscopic lead in alpha and duplex brasses
has been studied by INCRA.5 The i ad particles act as chip breakers,
significantly improving machinability. Lead particles distribution is
excellent in continuous cast structures.
Continuous Casting of
High-Strength Brasses
The casting conditions applied to the alloyed brasses are similar to those
used on the straight Cu-Pb-Zn alloys.
Continuous Casting of DZR Brass
Continuous casting of dexincification-resistant a brass is the same as for
conventional single-phase brass as outlined in Section 5.7.1. The restricted
composition covered by specification Table 5.11 (CuZn36Pb2As-CW602N) must be
strictly observed to ensure adequate hot stamping properties in the a/B
temperature range and also to ensure an all-a structure after heat
treatment. The bulk of this material is cast in the form of rod.
