Semi-chilled cast iron rolls

Semi-cold hard cast iron rolling rolls

1.Introduction

Semi-cold hard cast iron rolling rolls are a kind of new metallurgical composite material, which are widely used in steel rolling mills. This kind of material has the advantage of superior anti-wear performance, prolonged service life and considerable economic benefits. In addition, semi-cold hard cast iron rolling shells have a stable geometrical structure, easy forming and processing, and good roll union performance.

2.Application

Semi-cold hard cast iron rolling rolls are applied in steel rolling mills to process steel wire, square steel, angle steel, channel steel, I-shaped steel, flat steel, etc. These rolling mill rolls can be delivered to steel plants for the production of semi-finished products. It can be used for steel thinning, finishing, and profiling.

3. Structure

The structure of semi-cold hard cast iron rolling rolls consists of an inner support layer and an outer working layer. The inner support layer consists of high-strength cast iron as matrix and spherical graphite as reinforcement. The outer layer is made of wear-resistant alloy, which can effectively improve the wear resistance and service life of the outer surface of the rolling rolls.

4.Advantage

The main advantage of semi-cold hard cast iron rolling rolls is the uniformity of the whole matrix, which can easily resist any external impact or distortion. Therefore, this type of roll can work stably at high speed while maintaining a good surface quality. In addition, the roll has excellent thermal stability, crack resistance and good corrosion resistance, which prolongs its service life and efficiency.

5.Maintenance

To extend the service life of semi-cold hard cast iron rolling rolls, regular inspection, maintenance and repair shall be carried out. Firstly, when the roll is running, pay attention to check the roll surface and roll core regularly. If there is any abnormality, timely adjustment and repair should be carried out. Secondly, ensure that the roll is well lubricated before running, and regularly check the diameter and the radial run-out of the roller surfacing. Moreover, it is necessary to clean the surface of the roll, pay attention to the distribution of the working pressure and strengthen the repair, adjustment and maintenance of the bearing.

6.Conclusion

Semi-cold hard cast iron rolling rolls are a kind of new metallurgical composite material intended for steel rolling mills, and due to their structure, anti-wear performance, service life and economic benefits they have become increasingly popular among steel mills. However, in order to get their best performance, regular inspection, maintenance and repair should be carried out.

Gray cast iron semi-hard rolling roll is widely used in steel rolling production because of its good surface finish, wear resistance and corrosion resistance.

Gray cast iron semi-hard rolling roll is made of HT200 or HT250 gray cast iron after its special heat treatment, that is, the surface is processed by quenching, its core is unchanged, and its hardness is HB180～250.

In steel rolling process, gray cast iron semi-hard rolling roll shows its following advantages:

Firstly, gray cast iron semi-hard rolling roll has good wear resistance, which can keep a certain level of surface finish on the sectional surface of steel strip. During steel rolling, the external force exerted on the rolling roll surface is great, and the external force is related to the rolling rate, rolling force and number of rolling passes.

Secondly, it has certain corrosion resistance. The indispensable condition for the rolling quality of steel strip is that the sectional shape of rolling roll should be remain unchanged, so the surface of rolling roll should has certain corrosion resistance, which can prevent it from degumming, cracks, scratches and other phenomena.

In a word, gray cast iron semi-hard rolling roll is suitable for high speed rolling and medium and small section steel rolling. Its advantages of high abrasion resistance makes it the first choice for many steel rolling factories.