Forgings

Compare work roll vs backup roll mechanics and metallurgy. Select the right rolling mill rolls to prevent costly failures and optimize performance.

The mold steel is a type of steel specifically used to make various molds. Die casting molds, plastic molds, stamping molds, and hot forging molds all rely on mold steels. The mold steel is mainly divided into cold work mold steel, hot work mold steel, and plastic mold steel.

Mould steel is a special type of steel used for manufacturing moulds such as cold stamping dies, hot forging dies and die-casting dies. Moulds serve as key processing tools and raw materials for machinery manufacturing and industrial production.

Ever wonder how strong metal parts are made with minimal waste? The roll forging process is key. It shapes metals efficiently while enhancing strength.This process differs from traditional forging by using rolling to form parts with precise grain flow. It’s vital for modern manufacturing.

The fracture of the 9Cr2Mo steel cold rolling roll is classified as hydrogen embrittlement fracture, with the crack initiation site located at the circular spots inside the roll where hydrogen accumulates. High hydrogen content and large quenching stress caused by delayed tempering are the main causes of hydrogen embrittlement fracture of the roll, while severe dendrite segregation and abundant inclusions accelerate the fracture. The recommendations are as follows:① Improve metallurgical quality to reduce the content of inclusions and the degree of segregation in the steel;② Increase the forging ratio to avoid dendrite segregation in the material;③ Prolong the hydrogen diffusion time to reduce the hydrogen content of the roll;④ Conduct tempering in a timely manner to reduce the quenching stress of the cold rolling roll.

Forged steel cold rolling rolls commonly use electric slag steel to manufacture roll blanks; Steel ingots are usually treated with high-temperature diffusion to improve the uniformity of the chemical composition of the rolling billet; The roller blank is deformed by forging, and the material has good density; After forging the roll blank, normalizing treatment is carried out to eliminate secondary network carbides, and spheroidization annealing treatment is performed to prepare the microstructure for the subsequent quenching and tempering treatment; Perform hydrogen expansion annealing to prevent the formation of white spots.