介绍了汽车大梁钢（510L）在热连轧过程中表面氧化铁皮的结构、组成和演变规律。通过热力学分析和FeO层中氧的贫化与富集分析了FeO的先共析和共析反应行为，指出FeO等温转变分为两个阶段，即第一阶段为析出先共析Fe304，后续阶段发生共析反应（FeO→Fe＋Fe304）。通过控制卷取温度，可以控制FeO的共析反应，从而达到控制氧化铁皮结构的目的。现场试轧结果表明，氧化铁皮以Fe304为主，其含量超过80％（质量分数，下同），氧化铁皮厚8～11μm，冷弯试验表明，氧化铁皮与钢板结合牢固，氧化铁皮粘附性好。
The structure and evolution rules of oxide scales during hot strip rolling were discussed. The proeutec told and eutectoid transformation behaviors of FeO were discussed in terms of thermodynamics and oxygen deple tion or enrichment in FeO. The isothermal transformation of FeO was divided into two stages, or the occurrence of proeutectoid precipitation of Fe3O4 followed by the eutectoid transformation of FeO→Fe＋Fe3O4. The eutectic reaction kinetics from FeO can be controlled by changing coiling temperature, and the oxide structures can be con trolled. The results of hot rolling trials show that the content of Fe3O4 is above 80% and the thickness of oxide scales is between 8 and 11μm, the results of cold bending trial show that the adhesion between oxide scale and substrate is good.
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