Measuring Rockwell hardness requires applying specific static force to a metal surface for a definite time using precise recording measuring procedures. There are several different scales by which a material’s hardness is measured on, but blade steels are measured on the C scale. How Rockwell Hardness Gets Measured. The best quality chef knives have a Rockwell Hardness Rating or HRC rating of 60 and above. 52-54 HRC: Quite soft steel, reasonable quality. The handles are made with both synthetics and wood. Knives that have harder blades ultimately can hold a sharper edge. 54-56 HRC: The hardness of many French chefs’ knives. There are other hardness tests for other types of materials. Up to 52 HRC: Too soft for making knives. However blades that are too hard effectively can become brittle. This scale is called the Rockwell C scale. Construction. The Rockwell scale is a hardness scale based on indentation hardness of a material. The Rockwell scale was cocreated by Hugh and Stanley Rockwell in the early 20th century to test the hardness of different materials. The Rockwell C scale is also the most precise way to report metal strength used in industrial machine knives. The table below gives an overall overview of the characteristics of knives steel with different hardness levels. Hardness of knives steel. Also, Rockwell hardness test only reveals the surface hardness of a material and not its internal hardness. These knives score 60 on the Rockwell Hardness Scale. That relates to the hardness of minerals and is not appropriate for steel. The Rockwell test measuring the depth of penetration of an indenter under a large load (major load) compared to the penetration made by a preload (minor load). (HRC means Hardness on Rockwell scale C.) There are different scales, denoted by a single letter, that use different loads or indenters. As previously mentioned, Cangshan has 17 patented or patent-pending handle designs. The Rockwell scale is a measurement system used by commercial manufacturers to determine the relative hardness of objects based on the depth of indentation from a heavy object. This means the steel is hard, retains its edge for a long time, but may also be slightly more brittle than other knives. The hardness rating is usually abbreviated Rc. Because the company values aesthetics and beauty, their knives stand out aesthetically. Typically knives range from the mid 40’s to the low 60’s depending on the material used in the blade and the manufacturing method. In other words, they drop a heavy ball or diamond cone onto the steel and measure the size of indentation. Because some high-tech knife blades are made out of ceramic, you will hear the mohs scale used. The hardness of tooling steel is expressed in degrees Rockwell C, often abbreviated as HRC. WHAT IS A GOOD ROCKWELL SCALE RATING FOR KITCHEN KNIVES? Their wood handles are crafted from Acacia, Walnut, Teak, Ashwood, or African Blackwood. The Rockwell scale is used to measure the hardness of a material.