Carbon steel is reactive — it will rust quickly if not properly cared for. Always wash immediately after use, dry thoroughly, and apply a thin coat of food-safe oil (camellia, mineral) before storage. Over time it develops a patina that offers some natural protection and, for many users, becomes part of the knife's character. Rewarding to use, but not recommended if you want a "wash and forget" knife. []
ApexUltra
55–58 HRC — Soft. Easy to sharpen and forgiving of rough use, but dulls faster. Typical of most German knives.
59–61 HRC — Balanced. Good edge retention with manageable sharpening. Common in mid-range Japanese knives.
62–64 HRC — Hard. Excellent edge retention, holds a very fine edge. Requires more care and a fine stone to sharpen.
65+ HRC — Very hard. Exceptional edge longevity but more brittle — more prone to chipping if used roughly.
Higher is not always better — it depends on how you use and maintain your knife.
ApexUltra 是刀具鋼材界最新的創新之一，其性能與特性專為滿足廚具製造者的需求而設計。靈感來自傳奇的超級青鋼與52100鋼，ApexUltra 追求極致高硬度，同時保有良好的韌性，能打造出極薄刀刃，勝任精細切割任務。
ApexUltra 的研發過程與業界傳統方法截然不同。核心團隊由三位成員組成：Larrin Thomas、Tobias Hangler 與 Marco Guldimann，他們分別是受過嚴謹訓練且經驗豐富的金屬學家、鐵匠與廚師，對刀具鋼材及其應用有透徹理解。憑藉理論知識為後盾，他們運用歐洲各地的資源，打造出高純度、高均質性，且晶粒與碳化物尺寸細緻的 ApexUltra。這造就了真正出色且均衡的性能，超越其前輩超級青鋼與52100鋼，使鋼材能硬化至接近 69HRC，同時在 65HRC 下仍保有優於超級青鋼的韌性。製刀師能打造出極致細薄、在廚房中使用壽命持久的刀刃。
祕密在於技術與成分。透過精選原料與先進的電渣重熔技術，夾雜物與雜質被降至最低，減少可能損害刀具韌性的顆粒。檢視元素組成，你會發現這是一種極低合金碳鋼。少量的鉻能形成富鉻碳化鐵，顯著提升硬度；鎢與釩則形成極細碳化物，大幅增加耐磨性，同時不犧牲太多韌性。這使得在極高工作硬度下，硬度與韌性達到良好平衡，耐磨表現更是出色。
製造者追求的目標之一，是讓鍛造製刀師易於加工，因此他們刻意維持低合金含量，使所有碳化物能在鍛造溫度下完全溶解。這意味著我們可以期待所有具頂尖鍛造技術的優秀鐵匠，能像處理他們熟悉的傳統碳鋼一樣駕馭這種鋼材，但能從更優質的材料中獲得更高性能。另一個附加優點是易於研磨，儘管硬度極高（廚刀應用中達 66HRC+），低體積且小尺寸的碳化物讓 ApexUltra 能輕鬆在一般磨石上研磨，因此這確實是對製刀師與使用者都友善的鋼材。
雖然 ApexUltra 在市場上相對新穎，但大多數歐洲訂製刀匠已將其視為碳鋼的首選，希望我們最終能看到日本製刀師也將這種鋼材運用於他們的刀具中。
ApexUltra 元素組成
ApexUltra 成分分析
ApexUltra 含有什麼？
每種元素對刀鋼性能的貢獻。
| 元素 | 規格範圍 | 對刀的作用 |
|---|---|---|
| W鎢 | 2.6% | Forms hard carbides for wear resistance and edge stability, and keeps the steel hard even at elevated temperatures. |
| Cr鉻 | 1.5% | Raises corrosion resistance; at roughly 13%+ free chromium the steel qualifies as stainless. Also improves hardenability and wear. |
| C碳 | 1.25% | The primary hardening element. More carbon means a harder edge that holds longer — but past a point it trades away toughness and rust resistance. |
| V釩 | 0.4% | Forms extremely hard vanadium carbides for superior edge retention, and refines the grain for a finer, tougher edge. |
| Si矽 | 0.35% | Strengthens the steel matrix and acts as a deoxidiser, improving hardness and resistance to oxidation. |
| Mn錳 | 0.3% | Aids hardenability and strength and acts as a deoxidiser in smelting. Too much can reduce toughness. |
| P磷 | 0.0–0.01% | An impurity from smelting. Even small amounts promote brittleness, so steelmakers keep it as low as possible. |
| S硫 | 0.0–0.01% | An impurity that reduces toughness and promotes brittleness; only ever added deliberately in free-machining steels. |
成分資料來自 zknives（K&S 鋼材資料集）參考文獻。這些範圍取自 K&S 鋼材成分資料集，該資料集源自 zknives；僅當製造商數據用於頁面時，才會另行引用。
