Air-annealing method for the production of seamless titanium all

Details Air-annealing method for the production of seamless titanium all Air-annealing method for the production of seamless titanium all

1987-10-23

1989-02-07

Roy, Upendra

Metal treatment

Compositions

Heat treating

148 115F, 420420, C22F 118, C22C 1400

Patent

active

048029300

ABSTRACT:
A process for the production of seamless titanium alloy tubing is disclosed in which solution annealing for all intermediate operations are performed in an air atmosphere furnace, followed either by water or room temperature air quench in order to achieve cooling within the requisite five (5) minutes. Preferably final aging is performed in a vacuum furnace to avoid surface contamination which would ordinarily require subsequent removal by pickling. This produced a finer grained product, which was more susceptible to defect detection by ultrasonic testing, which produced an optimum combination of strength and ductility, and which showed more uniform response to aging between different lots and tube sizes.

REFERENCES:
patent: 3795970 (1974-03-01), Keathley et al.
patent: 3969155 (1976-07-01), McKeighen
patent: 4053330 (1977-10-01), Henricks et al.
patent: 4098623 (1978-07-01), Ibaraki et al.
patent: 4581077 (1986-04-01), Sakuyama et al.
patent: 4600449 (1986-07-01), White et al.
patent: 4690716 (1987-09-01), Sabol et al.

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