Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...
Patent
1990-04-02
1992-07-14
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Processes of coating utilizing a reactive composition which...
148325, 148333, 140540, 420 42, 420 62, 420 79, 420 87, 420103, C21D 800
Patent
active
051299593
ABSTRACT:
A method for producing aluminum-containing ferritic stainless steel from a magnesium-contaminated melt such that the steel is suitable for growing oxide whiskers to cover the surface thereof is disclosed. The method comprises adding sulfur to the contaminated melt in an amount sufficient to increase the sulfur content not less than 1.3 time the magnesium content, whereupon the sulfur reacts with the magnesium to render the magnesium inert to whisker growth. The method also preferably comprises an addition of titanium, zirconium of hafnium in amounts sufficient to react with residual sulfur in excess of the amount required for magnesium reaction, thereby mitigating the adverse affect of sulfur on oxide adhesion.
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patent: 4588449 (1986-05-01), Sigler
patent: 4661169 (1987-04-01), Aggen et al.
patent: 4867811 (1989-09-01), Wakiyama et al.
Dean R.
Fekete Douglas D.
General Motors Corporation
Grove George A.
Ip Sikyin
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