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spheroidizing furnace the preheating process

spheroidizing furnace the preheating process

Product overview：

In the spheroidizing furnace, the preheating process is an essential step that occurs before the main heating and soaking stages. Preheating is used to gradually raise the temperature of the steel to a specific range below the spheroidizing temperature. This preheating step is crucial for several reasons
1. Avoiding Thermal Shock: Preheating helps to avoid thermal shock to the steel, especially for larger and thicker sections of the material. Rapidly raising the temperature of cold steel to the spheroidizing temperature can lead to uneven expansion, which may cause cracking or distortion in the material. Preheating allows the steel to reach a more uniform temperature throughout its cross-section.
2. Minimizing Temperature Difference: By preheating the steel, the temperature difference between the core and the surface of the material is reduced. This temperature uniformity ensures that the entire steel piece will experience the desired heat treatment process consistently.
3. Reducing Residual Stress: Preheating also helps in reducing residual stress within the steel. During the preheating process, internal stresses from previous processing steps or cold working can be relieved, preventing potential cracking or distortion during the subsequent heating and cooling stages.
4. Saving Time and Energy: Preheating the steel to a temperature below the spheroidizing temperature reduces the time and energy required to reach the main spheroidizing temperature. Since preheating takes the steel part closer to the desired temperature range, the main heating stage can be more efficient and consume less energy.
5. Facilitating Transformation:
Preheating prepares the steel for the subsequent spheroidizing process. It allows the material to be more responsive to the main heating and soaking stages, enhancing the transformation of the microstructure from pearlite or cementite to spheroidite.
Preheating Temperature and Time:
The preheating temperature is typically below the spheroidizing temperature and can vary depending on the specific steel composition and the desired final properties. Common preheating temperatures for spheroidizing are in the range of 500°C to 650°C (932°F to 1202°F). The preheating time will vary based on the steel's size and thickness, but it is generally shorter than the main soaking time during spheroidizing.
the preheating process in a spheroidizing furnace is a critical step in preparing the steel for the main spheroidizing heat treatment. It ensures uniform temperature distribution, reduces thermal stress, and facilitates the subsequent transformation of the microstructure, leading to improved mechanical properties such as increased ductility and machinability in the final product.

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We are a source manufacturer of professional steel wire, we also have our own international trade department, we produce and sell by ourselves.
 
Ningbo SunRise Refined Metal Wire Material Co., Ltd. is China Custom spheroidizing furnace the preheating process Suppliers and spheroidizing furnace the preheating process Factory. We not only brought in 10 sets of spheroidizing annealing furnaces, dozens of metal wiredrawing equipments and twoworld's leading automatic phosphating pickling lines, but also engaged senior engineers as consultants fromTaiwan. The raw material that we use are supplied by the well known suppliers such as Bao Steel Co., Ltd and Xingtai lron & Steel Corp., Ltd. Also, the domestic lron & Steel manufacturers can be nominated by our customers.
 
We mainly produce steel wire made of alloy steel, bearing steel, free-cutting steel, high-quality carbon structural steel, low-alloy high-strength structural steel and other materials as raw materials. The annual output is 360,000 tons. It is one of the largest finished wire production bases in Ningbo. We serve all kinds of fasteners, special-shaped parts, automotive fasteners, wind power, petroleum and other fields. Ningbo SunRise is able to meet the high quality requirements of our customers throughout the whole operation process from raw materials to finished products.

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