High-carbon high-speed steel roll (HSS roll) is the hot-roll material with the shortest appearance, the fastest development, and the widest application prospect. High-speed steel, also known as wind steel or front steel, means that it hardens even when cooled in the air when quenched and is sharp.
It is complex alloy steel with carbide-forming elements such as tungsten, molybdenum, chromium, and vanadium. The total amount of alloy elements reaches about 10%~25%.
The application of high-speed steel rolls is an important part of the development of modern steel rolling production. It is another significant change to the development of the iron and steel industry after microalloying, controlled rolling, and controlled cooling technology. High-speed steel rolls are widely used in steel rolling in the fields of plates, sections, bars, and wires, not only for working rolls but also for supporting rolls.
The good wear resistance of high-speed steel rolls is inseparable from the obvious difference from traditional rolls.
High-speed wire mill pre-finishing unit. Finishing Mill for Hot-rolled Narrow Strip Mill.
Finishing stands for spring flat steel mill and small section mills such as angle and channel steel.
Advanced Manufacturing Processes and Implementation Standards
Product design → roll billet design → roll billet manufacturing → roll billet acceptance → annealing → rough turning → ultrasonic flaw detection → high temperature quenching → low temperature tempering → ultrasonic flaw detection → finishing → ultrasonic flaw detection → roll body grinding → roll number → inspection → cleaning → packaging→ storage → shipments→ inspection → use and maintenance →exchanged → improvement of design.
It can be seen from the flow chart that roll manufacturing forms a closed-loop system from product design, production manufacturing, use and maintenance, and improvement design, and the quality of roll is constantly improving.
Standards for roll manufacturing and testing:
First, production must be organized according to product drawings and technical requirements agreed upon by both suppliers and consumers.
The main standards are:
GB/T 13313-2008 Roll Shore and Ribbon Hardness Test Method
GB/T 1503-2008 Cast Steel Rolls
Inspection Rules:
A. Inspect the dimensions and surface quality of each part individually;
B. Perform three ultrasonic flaw tests one by one;
C. Carry out hardness tests one by one;
D. The depth of the hardened layer on the roll body is determined by the manufacturing process.
