◆ Main chemical composition

◆ Advanced manufacturing technology and implementation standards

Product design → roll design → roll manufacturing → roll acceptance → Annealing → rough turning → ultrasonic inspection → high temperature quenching 

→ low temperature tempering → Ultrasonic inspection → Finishing → Ultrasonic inspection → roll grinding → roll number → Inspection → cleaning → Packaging

→ Shipping → storage → inspection → Maintenance → Field communication → Improved design.

It can be seen from the flow chart that roll manufacturing forms a closed-loop system from product design, manufacturing, use and maintenance, 

and improvement design, and roll quality is constantly improving.

Roll manufacturing and testing standards: First of all, production and manufacturing must be organized according to the product pattern and technical 

requirements agreed by both the supply and demand parties. The main standards are:

GB/T 13313-2008 roll hardness test method for Shaw and Richter

GB/T 1503-2008 Cast steel roll

spection rules:

a. Each part of the size and surface quality inspection;

b. Carry out three ultrasonic inspections one by one;

c. Hardness test piece by piece;

d. The depth of the hardened layer of the roll body is affected by the manufacturing process.