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鋼胚加熱軋延製成。以小鋼胚為原料,經軋延後製成盤元(橫剖面為圓型),再加工後可生產螺絲、螺帽、鋼線等下游產品。依含碳量不同區分為高、中、低碳盤元,其中含碳量在0.45%以上者為高碳盤元,含碳量在0.22%~0.45%區間者為中碳盤元,含碳量在0.22%以下者為低碳盤元。依中鋼的分類標準,直徑14mm以上者稱為棒鋼,14mm以下者稱為線材,二者合稱為棒線。當盤元原料加工生產螺絲時,容易碎裂,因此須經熱處理將材質軟化,使其金相組織成圓球化,能耐加工時的衝壓,經此處理之線材即為球化線材。
Wire rod is a rolled alloy or non-alloy steel product, produced from a semi (e.g. bloom) and having a round, rectangular or other cross-section. Particularly fine cross-sections may be achieved by subsequent cold forming (drawing). Wire rod is wound into coils and transported in this form.