Method of producing a tube of ultra-high strength steel having r

Details Method of producing a tube of ultra-high strength steel having r Method of producing a tube of ultra-high strength steel having r

1977-08-26

1978-07-25

Stallard, W.

Metal treatment

Compositions

Heat treating

C21D 908

Patent

active

041027116

ABSTRACT:
A method of producing a tube with an ultra-high tensile strength over 255 kg/mm.sup.2 and remarkably improved ductility and toughness is provided, which comprises preparing a mother tube through hot extrusion of a steel consisting essentially of 15.0 - 18.5% by weight of Ni, 12.5 - 15.0% by weight of Co, 5.0 - 6.9% by weight of Mo, 1.00 - 1.28% by weight of Ti, 0.01 - 0.20% by weight of Al and the balance essentially iron, cold working the mother tube with a reduction in wall thickness of 5 - 25%, then raising the temperature of the resulting tube to a temperature of 800 - 950.degree. C in a period of from 20 minutes to 2 hours and maintaining the heated tube at this temperature for from 30 minutes to 3 hours, and, after cooling to or below room temperature, ageing the cooled tube at a temperature of 450.degree. - 550.degree. C for 1 - 10 hours.

REFERENCES:
patent: 1969665 (1934-08-01), Smith
patent: 2184624 (1939-12-01), Raab et al.
patent: 3945858 (1976-03-01), Matsubara et al.
patent: 3976514 (1976-08-01), Matsukura et al.

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