wiki- Blue Steel
Definition
Blue Steel, known in Japanese as Aogami, is a premium low-alloy carbon steel originally developed by Hitachi Metals (now Proterial, Ltd.). It is produced by adding alloying elements such as chromium and tungsten to Shirogami #2 (White Steel #2), resulting in a steel that combines exceptional sharpness with improved toughness, wear resistance, and edge retention. Aogami is widely regarded as one of the finest steels for traditional Japanese kitchen knives.
Details
Aogami was developed to enhance the performance of traditional carbon steel while preserving the excellent sharpening characteristics valued by Japanese craftsmen. The addition of chromium and tungsten improves wear resistance and edge stability, allowing the blade to maintain sharpness for longer periods.
The two most common grades are:
Aogami #1 (Blue Steel #1)
Aogami #1 contains more carbon than Aogami #2, allowing it to achieve higher hardness and longer edge retention. This increased hardness can deliver outstanding cutting performance, but it also makes sharpening more demanding and requires greater skill to maintain properly.
Aogami #2 (Blue Steel #2)
Aogami #2 is the most widely used grade in professional kitchen knives. It offers an excellent balance of sharpness, toughness, edge retention, and sharpening ease. Many chefs consider it one of the most practical premium carbon steels available.
Both grades are known for their ability to maintain stable cutting performance while reducing the risk of edge chipping compared to traditional White Steel.
Comparison
Compared with Shirogami (White Steel), Aogami offers superior wear resistance, longer edge retention, and greater toughness. The alloying elements help the blade stay sharp for extended periods and reduce the likelihood of chipping during demanding use.
However, these advantages come with trade-offs. Aogami is generally more expensive to produce and somewhat more difficult to sharpen than Shirogami.
Shirogami remains highly valued for its exceptionally pure composition, extreme sharpness, and ease of sharpening. Many craftsmen appreciate its ability to take an extraordinarily refined edge. However, it tends to wear faster and may be more susceptible to chipping under certain conditions.
As a result, Shirogami is often favored by those who prioritize ultimate sharpness, while Aogami is preferred by users seeking a balance of sharpness, durability, and edge longevity.
Practical Use
Aogami steels are widely used in premium Japanese kitchen knives, particularly those intended for professional chefs and serious enthusiasts.
Aogami #2 is commonly selected for:
- Gyuto knives
- Santoku knives
- Yanagiba knives
- Deba knives
- General professional kitchen use
Its balance of performance and maintainability makes it suitable for a broad range of culinary applications.
Aogami #1 is typically chosen by experienced users who seek maximum hardness, superior edge retention, and the highest level of cutting performance. It is especially valued in environments where prolonged sharpness is critical and regular maintenance is performed by skilled users.
Cultural Note
Aogami represents an important stage in the evolution of Japanese knife steel. By combining the traditional cutting qualities of carbon steel with improved durability through alloy technology, it bridges the gap between historical craftsmanship and modern metallurgical innovation.
Many of Japan's most respected blacksmiths continue to work with Aogami because it allows them to create knives that satisfy the demanding standards of professional chefs while preserving the sharpening experience and cutting feel associated with traditional Japanese blades.
Today, Aogami remains one of the most prestigious knife steels in Japan, admired for its combination of sharpness, resilience, and long-lasting performance.
Related websites
Blue Steel vs White Steel
Blue Steel #2 Knife Collection
Blue Steel #1 Knife Collection