ThePipingMart Blog Metals 5CR15 Vs 7CR17 Steel – What’s the Difference

5CR15 Vs 7CR17 Steel – What’s the Difference

5CR15 vs 7CR17 Steel

Are you a knife enthusiast or a chef always seeking the best culinary knives? Then you must have heard about 5CR15 and 7CR17 steel. These two steels are popular among manufacturers of high-quality knives and are known for their excellent reliability, sharpness, and resistance to corrosion. However, most people ask what the difference is between 5CR15 and 7CR17 steel and which steel is better. Well, you are in the right place. In this blog, we will discuss everything you need to know to differentiate between these two types of steel.

What is 5CR15 Steel?

5CR15 steel is a type of stainless steel made from 5% chromium and 15% carbon. It has excellent corrosion resistance, hardness, and strength, making it an ideal choice for cutlery blades, scissors, kitchen utensils, razor blades, and tools. It also has superior wear-resistance properties compared to other stainless steels.

What is 7CR17 Steel?

7CR17 Steel is a Chinese stainless steel grade popularly used in producing knives and other cutlery. It has a high carbon content (around 0.7%) and chromium content of 17%. This combination gives it reasonable corrosion resistance, good hardness, and decent edge retention. Not only that, 7CR17 steel is also relatively inexpensive, making it an attractive option for knife makers around the world.

Difference Between 5CR15 and 7CR17 Steel

Chemical Composition

One of the major differences between 5CR15 and 7CR17 steel is their chemical composition. The former is a high-carbon martensitic stainless steel blended with chromium, molybdenum, and vanadium, while the latter is a low-carbon martensitic stainless steel blended with chromium, molybdenum, and nickel. The higher carbon content in 5CR15 steel gives it a harder and sharper edge, making it ideal for heavy-duty cutting tasks. On the other hand, 7CR17 steel has a softer edge that can be sharpened easily and has better corrosion resistance.


The hardness of a steel blade is crucial in determining its sharpness, durability, and overall performance. 5CR15 steel has a hardness level of 55-57 HRC, while 7CR17 steel has a hardness level of 56-60 HRC. Thus, 7CR17 steel presents a more durable option, and its hardness level allows it to be sharpened easily and quickly.

Corrosion Resistance

Corrosion is the process of metal breakdown due to exposure to air, water, or other substances. Therefore, a blade’s level of corrosion resistance is crucial, especially for knives that may come into contact with acidic foods. 7CR17 steel has a higher level of corrosion resistance than 5CR15 steel due to its higher nickel content. Thus, 7CR17 steel is ideal for knives exposed to moisture or acidic foods.

Edge Retention

The ability of a blade to retain a sharp edge after extended periods of use is another important factor to consider when choosing steel. With its high carbon content, 5CR15 steel can retain a sharp edge for a long time. However, it is more brittle and may be better for heavy-duty tasks. On the other hand, 7CR17 steel, with its nickel content, presents a more balanced performance and is ideal for both heavy-duty and light-duty tasks.


The final factor to consider is the price of the steel. 7CR17 steel is generally more expensive than 5CR15 steel due to its higher nickel content and better overall performance.


5CR15 and 7CR17 steel are both popular options among knife enthusiasts and manufacturers, and each has unique characteristics that make it ideal for specific tasks. It is important to consider the properties of each steel and determine the tasks for which it is best suited. Regardless of the steel you choose, a proper maintenance and sharpening routine is essential to maintain the sharpness and durability of your knives. So, which steel will it be?

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