Metal treatment – Compositions – Heat treating
Patent
1983-07-11
1985-01-22
Stallard, W.
Metal treatment
Compositions
Heat treating
148 12F, C21D 714
Patent
active
044949995
ABSTRACT:
Microalloyed steel containing, among other ingredients, at least 0.02% niobium, between 0.005 and 0.01% nitrogen, and titanium in a proportion equaling about 3.5 to 4 times that of nitrogen is continuously cast into a slab which is heated to a temperature between about 1120.degree. and 1160.degree. C. whereby titanium nitride precipitates in particles ranging between about 0.06 and 0.2.mu.. The slab is thermomechanically treated at this temperature and after intermediate cooling in several hot-rolling stages, with an initial deformation of at least 55%; after final rolling, the slab is cooled in water at a rate of at least 10.degree. C. per second to a temperature of about 500.degree. to 550.degree. C. Niobium, which goes into solution at the elevated initial temperature, forms NbC precipitates during the subsequent treatment; this has a hardening and grain-refining effect.
REFERENCES:
patent: 3945858 (1976-03-01), Matsubara et al.
patent: 4020312 (1977-04-01), Araki et al.
patent: 4105474 (1978-08-01), Nakasugi et al.
patent: 4137104 (1979-01-01), Nashiwa et al.
patent: 4138278 (1979-02-01), Nakasugi et al.
Dubno Herbert
Mannesmann Aktiengesellschaft
Ross Karl F.
Stallard W.
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