Why do the same model tube mill roller from various supplier has various price ?

Why do the same model tube mill roller from various supplier has various price ?

According to the experience in the tube tube roller , the cost of raw material of tube roller is almost the same in different country ,such as India ,China and Turkey .

A number of customers from steel tube factory are confused about the price of tube mill roller , they have been asking why tube mill roller from China’s supplier is different in the price .

As a manufacturer of ERW pipe mill and tube mill roller , We would like to share the know how with you.

1. The processing step of tube mill roller :

blanking → rough turning → rough arc machining → semi-finish turning → quenching treatment → tempering treatment → cold treatment → finishing → mirror finish processing → demagnetization treatment → packing

The heat treatment of tube mill roller includes he quenching treatment,tempering treatment and cold treatment are the key and important step for the tube mill roller ,meanwhile , it is a step where The cost-saving steps taken by dishonest suppliers by exploiting loopholes.

2.The corrected heat treatment step as below

NO.1:Quenching treatment: The temperature reaches 900–1000°C. Quenching is performed in a vacuum furnace,with a quenching time of no less than 16 hours.

NO.2 :Tempering treatment: The tempering temperature reaches 200°C, followed by natural cooling. The roll requires 3 tempering cycles, with a total tempering time of 24 hours.

NO.3 treatment of the roll: The roll requires 8 hours of cold nitrogen treatment + 1 hour of nitrogen absorption,Total: 9 hours.

After the cold nitrogen treatment, the roll is tempered again for more than 10 hours.

Conclusion :The entire heat treatment process takes 4 days. If the heat treatment time for the roll is insufficient, the hardness of the roll will remain the same, but the wear resistance of the roll will differ.

Some dishonest suppliers of tube mill roller can reduce the cost by reducing the heat treatment time of tube mill roller . this result in reducing the service time of tube mill roller.

For some customers who do not know the real situation.  They typically select the supplier who supply the tube mill roller with competitive price .

We sincerely hope  the customer can consider quality and service life of tube mill roller rather than price .

 

 vacuum furnace                                                                                                                                                  

 cryogenic equipment 

 

 

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