Metal treatment – Compositions – Heat treating
Patent
1975-08-25
1977-03-08
Satterfield, Walter R.
Metal treatment
Compositions
Heat treating
148 121, 148 160, 148 36, C21D 148
Patent
active
040111113
ABSTRACT:
Deep drawing quality, low carbon steel is strengthened by alloy-nitrogen precipitation strengthening. A deoxidized, low carbon steel sheet or strip stock, or article formed therefrom, containing from about 0.02% to 0.2% titanium in solution, from about 0.025% to 0.3% columbium in solution, from about 0.025% to 0.3% zirconium in solution, singly or in admixture, is heat treated at 1100.degree. to 1300.degree. F (593.degree. to 705.degree. C) in an atmosphere containing 1% to 20% by volume ammonia for a time sufficient to produce an iron nitride surface layer, and then denitrided in a hydrogen-nitrogen atmosphere containing 6% to 50% hydrogen by volume at 1200.degree. to 1400.degree. F (649.degree. to 760.degree. C) for a time sufficient to remove the iron nitride surface layer and to reduce nitrogen in solid solution to less than 0.03% by weight.
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patent: 3765874 (1973-10-01), Elias et al.
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Armco Steel Corporation
Satterfield Walter R.
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