Method for reducing carbon deposits during box annealing

Details Method for reducing carbon deposits during box annealing Method for reducing carbon deposits during box annealing

1975-01-22

1976-06-29

Satterfield, Walter R.

Metal treatment

Compositions

Heat treating

148 121, 148 14, 148 167, C21D 148

Patent

active

039665097

ABSTRACT:
In the box annealing of ferrous metal sheets, the occurrence of carbon deposits and staining is materially reduced by initially heating the sheet in a protective atmosphere which is essentially a mixture of N.sub.2 and H.sub.2 and then modifying the atmosphere so that during the soak period it contains at least about 3% CO.sub.2, 3% CO, 4% H.sub.2 and 0.5% H.sub.2 O, balance N.sub.2. Atmosphere modification is effected only after the sheet portions, which are exposed to the protective atmosphere, reach a predetermined, minimum replacement temperature within the range 1000.degree. - 1400.degree.F.

REFERENCES:
patent: 2402013 (1946-06-01), Billeter et al.
patent: 3058856 (1962-10-01), Miller
patent: 3268371 (1966-08-01), Daubersy
patent: 3303064 (1967-02-01), Bernick et al.
Iron and Steel Engineer, Nov. 1968, pp. 73-79.

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