1. The spring cannot be tempered by increasing the temperature and shortening the time.

2. Hardness: As the tempering temperature increases, the hardness increases slightly and then decreases. The temperature with the best fatigue performance is slightly lower than the temperature with the maximum hardness.

3. Diameter reduction: The outer diameter of the carbon steel spring will decrease during tempering, so some size should be reserved when winding the spring.

4. Spring tempering color: The tempering color is related to the temperature and the residue on the surface of the steel wire. Uneven color is related to the temperature distribution or the airflow in the furnace. If you want uniform color, you must manage the furnace and loading method well. If there is oil or fingerprints on some parts, it will change color after tempering.

5. Tempering temperature: The commonly used tempering temperature is 250-280℃. If the steel wire is treated at 200-250℃, the strength can be improved, but the plasticity and toughness will be lost, which may cause cracks when the tension spring is bent or the torsion spring is bent.

6. Compression spring: Mild low-temperature tempering after hammering can reduce deformation.

7. Tension spring: The initial stress will be lost after tempering treatment, and the allowable loss should be considered when setting the direction.

8. Torsion spring: After coiling, the spring shall be tempered at 280℃. If the spring needs to be processed again after coiling, the low temperature tempering temperature is 250℃.

9. The hook of the tension spring and the arm of the torsion spring: The position will change after tempering. If there is a precise position requirement, the change amount should be controlled well.

Kunshan Sekeli Hardware & Plastic Co., Ltd. was established in 2005. It is a comprehensive precision spring/stamping spring manufacturer integrating R&D, production, sales and service. The company's main products: compression springs, automotive springs, torsion springs, tension springs, power tool springs, antenna springs, constant force springs, etc. For more than ten years, the company has adhered to the service concept of "people-oriented, scientific and technological production" with high-quality products. It has a professional technical management team with many years of experience and is equipped with a number of advanced foreign production equipment and testing instruments to create satisfactory value for customers and help customers succeed. Sekeli is committed to creating a stage for strivers to display their talents. We are people-oriented and regard talents as important strategic resources and precious wealth of the company. Through respect, cultivation, motivation and help, we encourage progress, stimulate creativity, and share the fruits of success. Sekeli adheres to the values ​​of customer-oriented, trust, unity, respect, principles, self-examination, and obedience, and pursues healthy, stable and sustainable operations. Relying on high-quality products, our products cover the whole country and are exported to foreign countries, and establish long-term cooperative relationships with customers.