发明名称 |
METHOD OF FLUXLESS HOT DIP METALLIC COATING OF ALUMINUM-KILLED AND LOW ALLOY STEEL STRIP AND SHEET MATERIAL |
摘要 |
<p>A method of surface treatment of aluminum-killed and low alloy steel strip and sheet for fluxless hot dip metallic coating which comprises heating the steel in a furnace atmosphere containing the hot gaseous combustion products of air with a sulfur bearing gaseous fuel including 5 to 1600 grains of sulfur per 100 cubic feet of fuel wherein the atmosphere includes sulfur compounds and from about 6% free oxygen to about 7% by volume excess combustibles whereby to form a sulfur and oxygen rich film on the steel surfaces, passing the steel into a further heating section wherein it is brought to a maximum temperature of about 593 DEG to about 927 DEG C. in a reducing atmosphere containing at least 10% hydrogen by volume, passing the steel into a cooling section having an atmosphere containing at least 10% hydrogen and the balance nitrogen whereby to reduce the sulfur and oxygen rich film to a metallic iron surface, and cooling the steel approximately to the temperature of the molten coating metal bath. Coke oven gas may be used as the fuel for the furnace.</p> |
申请公布号 |
IN148727(B) |
申请公布日期 |
1981.05.23 |
申请号 |
IN1977DE48119 |
申请日期 |
1977.12.19 |
申请人 |
ARMCO STEEL CORP |
发明人 |
DUNBAR FRANK CURTISS;ARNOLD JERRY LEE |
分类号 |
C21D1/76;C21D9/46;C21D9/52;C23C2/02;C23C2/38;C23C2/40;(IPC1-7):C23F7/24 |
主分类号 |
C21D1/76 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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