折叠。经过轧制或采用其它方式加工的金属沿着轧制金属表面折叠起来，但并未被熔合成完好金属。
Lap. Fold of metal which has been rolled or otherwise worked against the surface of rolled metal, but has not fused into sound metal.
平辊立轧可显著减小坯料侧面双鼓形及折叠，倒棱轧制可有效消除坯料侧面双鼓形。
V rolling may decrease efficiently side overlap of plate, chamfer rolling may remove complately side overlap of plate.
管线钢在轧制变形过程中，如果边角部金属延伸不均会产生折叠，压入钢板表面后形成“细线”缺陷。
The slimline defect was formed by the folds forced in the surface which was generated by the inhomogeneity of edge and corner elongation in rolling process.
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