Control method for segregation and net carbon of 86-grade high-strength cord steel wire rod
A control method and steel wire rod technology, applied in the field of cord steel production, can solve the problems of lack of competitiveness, long process route, high cost, etc., and achieve the effects of reducing broken wires during drawing, shallow decarburization layer, and slight segregation
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[0027] The control method of segregation and net carbon of grade 86 high-strength cord steel wire rod includes processes: KR molten iron pre-desulfurization process→BOF converter smelting process→LF furnace refining process→continuous casting CC process→slab surface treatment process→slab heating process→ Controlled rolling process → controlled cooling process.
[0028] Smelting product composition control: C: 0.85-0.90%, Si: 0.15-0.35%, Mn: 0.40-0.60%, P: ≤0.010%, S: ≤0.010%, Cr: ≤0.010%, Al: ≤0.005%, The rest is Fe and unavoidable impurity elements.
[0029] The hot metal is pretreated by KR hot metal, the S content is ≤0.003%, and the special clean steel scrap for the cord is used (the main components are Fe, C, Si, Mn and other unavoidable trace elements, and the total amount accounts for 10% of the total metal loading. %~30%). In addition, the converter BOF smelting adopts the "double slag" process, that is, at the end of the silicomanganese oxidation period of 4 to 5 m...
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