本研究採用10B21低碳鋼鑽尾自攻螺絲進行兩階段熱處理，探討其熱處理後顯微組織及機械性質特性，以及將熱處理後鍍鋅螺絲成品進行氫脆試驗，以釐清相關材料特性。
第一階段熱處理選擇滲碳濃度為0.3%，進行淬火中斷熱處理。經滲碳處理後10B21材表層均生成更密集之麻田散體組織，原先淬火後之脫碳現象也有所改善。淬火中斷熱處理可使10B21低碳鋼基地生成麻田散體、肥粒體以及碳化物之混合結構，經實驗計算後破壞韌性較傳統淬火回火熱處理條件更高，處理時間也更為迅速。
第二階段熱處理利用錫湯重新加熱鑽尾至950°C而再次沃斯田體化後淬火，試片於表層可發現大量灰黑色麻田散體(α')與白色肥粒體(α)混合組織，表層平均硬度為HV576且具有良好貫穿鋼板能力。經以上兩階段熱處理，可得同時具有高表面硬度鑽尾與高韌性桿部10B21鑽尾自攻螺絲。
對進行兩階段熱處理後10B21鑽尾自攻螺絲進行氫脆試驗，實驗發現無發生扭斷強度大幅下降或扭斷前直接斷裂等疑似氫脆破壞之現象，巨觀破斷面出現在正常應力集中處之螺牙部，且斷面是平整的，微觀特徵呈現許多孔洞，符合延性破壞之微結構特徵，可認定經兩階段熱處理10B21鑽尾自攻螺絲因桿部具有較高韌性，故抗氫脆能力佳，亦具有實際應用潛力

In this study, a 10B21 low carbon self drilling tapping screw with high hardness drill and high toughness shank preventing hydrogen embrittlement without baking can be obtained by two-step treatment. Quenching at 220°C in 1 minute and partitioning at 400°C in 10 minutes on 10B21 low carbon self drilling tapping screw shows high toughness and avoiding HE without baking. Carburizing in potential of 0.3% shows better mechanical properties and enhances the surface hardness of 10B21 low carbon self drilling tapping screw significantly. Quenching at 950°C in 3 minutes by Tin bath shows the highest hardness and quenching beyond 1000°C would decrease the hardness of 10B21 low carbon self drilling tapping screw by grain coarsening.

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