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Related Tradenames :
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Allvac 70 (tm) , CP Grade 4 RMI 70 (tm) , Timetal
® 35A
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Principle Design Features :
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Grade 4 displays the highest strength of all
the unalloyed grades. It combines excellent corrosion resistance
with good formability and weldability. While mill availability
is not a problem, distributor availability is limited and
should be a consideration in alloy selection. Beta Transus
(F +/- 25) 1740.
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Applications :
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Generally chosen for its corrosion resistance
in a variety of chemical process equipment as well as marine
and airframe applications.
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Machinability :
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As a family, titanium and its alloys have developed
a mystique as a nightmare to machine. This is simply not the
case. Experienced operators have compared its characteristics
to those found in 316 stainless steel. Recommended practice
includes high coolant flow(to offset the material's low thermal
conductivity), slow speeds and relatively high feed rates.
Tooling should be tungsten carbide designations C1-C4 or cobalt
type high speed tools.
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Forming :
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May be hot or cold formed using hydropress, power
brake, stretch or drop hammer methods. Similar in characteristics
to 300 series stainless steels.
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Welding :
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Rated as "good" in terms of weldability
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Heat Treatment :
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Not hardenable by heat treatment.
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Forging :
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Roughing operations can begin at 935 C (1715
F),while finishing should be performed at 843 C(1550 F).
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Hot Working:
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Hot forming will reduce both the springback and
required forming forces, and will increase the overall ductility
of the material.
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Cold Working:
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The cold work characteristics of this material
is similar to that of a moderately tempered austenitic stainless
steel. In multiple cold forming operations, intermediate stress
relief is recommended to prevent tearing or other material
damage. Post-work annealing is required to reattain optimum
performance characteristics.
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Annealing :
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Heat to 704 C (1300 F),hold for 2 hours follow
by air cooling. For intermediate stress relieving, heat to
482-538 C(900-1000 F) and hold for 45 minutes.
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Other Physical Props :
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Beta Transus (F +/- 25) 1740
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