| 牌號：W18Cr4VCo5 |
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| 標準：GB/T9943-1988 |
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| ●特性及適用范圍： |
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| 為鎢系一般含鈷型高速鋼，較W18Cr4V的紅硬性和高溫硬度稍高，但韌性低，淬火后，表面硬度可達63～66HRC。用作高速切削刀具、自動化機床的刀具，供切削較高強度材料用。 |
| ●化學成份： |
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| 碳C：0.70～0.80(允許偏差:±0.01) |
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| 硅Si：0.20～0.40(允許偏差:±0.05) |
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| 錳Mn：0.10～0.40(允許偏差:+0.04) |
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| 硫S：≤0.030 |
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| 磷P：≤0.030 |
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| 鉻Cr：3.75～4.50(允許偏差:±0.05) |
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| 鎳Ni：允許殘余含量≤0.30 |
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| 銅Cu：允許殘余含量≤0.25 |
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| 釩V：0.80～1.20(允許偏差:±0.05) |
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| 鉬Mo：0.40～1.00(允許偏差:尺寸≤6,±0.05;尺寸＞6,±0.10) |
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| 鎢W：17.50～19.00(允許偏差:尺寸≤10,±0.10;尺寸＞10,±0.20) |
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| 鈷Co：4.25～5.75(允許偏差:±0.15) |
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| ●力學性能： |
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| 硬度：交貨硬度:(其他加工方法)≤285HB;(退火)≤269HB。試樣熱處理制度及淬回火硬度:≥63HRC |
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| ●熱處理規范及金相組織： |
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| 熱處理規范：淬火,820～870℃預熱，1270～1290℃(鹽浴爐)或1280～1300℃(箱式爐)加熱，油冷，540～560℃回火2次，每次2h。 |
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| ●交貨狀態：熱軋、鍛制、冷拉鋼棒以退火狀態交貨，熱軋、鍛制鋼棒以退火＋其他加工方法（剝皮、輕拉、磨光或拋光等）加工后交貨。 |
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