Method for improving the surface quality of annealed steel strip

Metal treatment – Compositions – Heat treating

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148 16, C21D 174

Patent

active

040690695

ABSTRACT:
The discoloration or off-luster border area known as "annealing border", which may form on low-carbon steel strip during box annealing of coils in commercial HNX atmospheres is eliminated by (a) subjecting the strip to oxidizing conditions such that the coil edges undergo a weight gain of 0.08 to 0.8 mg/cm.sup.2 of strip surface and (b) reducing the so-formed oxide during box annealing.

REFERENCES:
patent: 2656285 (1953-10-01), Burns et al.
patent: 3215566 (1965-11-01), Mayer
patent: 3355265 (1967-11-01), Hudson et al.
patent: 3406047 (1968-10-01), Magor et al.

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