Heat Treatment Applicated in the Fabrication of HSS Circular Slitter Blades

Published On: August 21, 2020

HSS industrial circular blades are necessary slitting tools for paper, packaging, converting, metal, print, and other industries. Owing to the particularity of processing, carbide circular saw blade is supposed to not only keep strong toughness, high hardness, and certain thermal hardness but also has high anti-fatigue fracture and carbide anti spalling ability.


HSS industrial circular blade production process is need to be explained. Exists two kinds of materials now for industrial circular slitter blades: tungsten carbide and high-speed steel (HSS). HSS blades cover two forming methods: brazing and high temperature of join materials. Next, we will introduce heat treatments.

Non-oxidizing protective atmosphere heating technology

Steel parts are likely to emerge defects like oxidation and decarburization when heated in air. To avoid those disadvantages, people fill the neutral atmosphere in furnace, for instance, nitrogen. To protect and heat the workpiece, this technology is called protective atmosphere heat treatment. Nitrogen is numerous in air and covers about 79% of air. To acquire nitrogen in industry, oxidation, and nitrogen in the air can be separated in a chemical or physical way. Nitrogen in the molecular state is neutral to general steel and metal in the heat process. It neither oxidizes, decarbonizes nor reduces oxides. Using a nitrogen-based atmosphere is the prospect for heat treatment, it is energy-saving and environmental protection.


Rapid heating technology

In cutting tool heat treatment craft, the two most important process parameters must mention here, namely heating temperature and heating time. Based on accordance with the formula that P=t(37tgts). In the formula, P equals quenching heating parameter; T means heating temperature; TS equals heating time.

Generally, the higher the austenitizing temperature is, the better the carbide circular slitter round blade’s wear resistance and thermal hardness are. However, considering grain refinement and toughness improvement, the quenching temperature should not be too high. In line with the use characteristic of the workpiece, lower quenching heat temperature and longer holding time should be adopted, yet this will waste much energy. Through repeated practice, rapid heating technology is explored. It means using higher temperatures and shorter time to make the blade hard and tough. From the formula, it can be seen that the effect of increasing temperature is better than prolonging time. As long as the parameters of the two functions are the same, the effect of heat treatment should be the same too. In the production, people realized that the concept of “degree” must be mastered in the process of rapid heating, otherwise it will be self-defeating.


Heat treatment is the core competence of tungsten carbide circular saw blade production. Konetool offers a variety of Carbide circular saw blades for cutting tools with complete specifications. Some products can supply in stock. Non-standard products can be produced in accordance with product drawing, specifications, materials, and hardness value provided by customers. Welcome to order products from all over the world and we will provide professional service for you.

Share our article: