Introduction to mill rolls knowledge
Cast iron roll The carbon content of cast iron roll is about 2.5%~3.5%. According to the main material, it can be divided into four categories: ordinary cast iron roll, high Ni-Cr infinite cold-hardened composite cast iron roll, high chromium composite cast iron roll and alloy nodular cast iron roll. Common structures in cast iron rolls […]
forged rolls manufacturing process
forged rolls manufacturing process is： Electric arc furnace smelting → LF \ VD refining → ingot casting → annealing → cleaning → electroslag remelting → annealing → forging → post forging heat treatment → rough machining → preliminary heat treatment → semi finishing → dual frequency quenching or differential temperature treatment → cryogenic treatment → […]
what are forged rolls？
Forged rolls is a metallurgical term, including smelting, ingot casting, forging, cold rolling work rolls and backup rolls. forged roll manufacturing process： Including smelting, ingot casting, forging, and cold-rolled work rolls and back-up rolls with high requirements for post-forging production. Since the 1960s, the main processes of steel heat treatment, rough machining, final heat treatment, […]
What are the types and characteristics of cast iron rolls
1) Alloy chilled cast iron rollThe alloy chilled cast iron roll is formed by using the supercooling degree of molten iron itself and the method of cold surface chilling to form a white layer. There is basically no free graphite in the matrix structure of the working layer of the roll body, and the metallographic […]
How is the coating of the furnace roll made?
To put it bluntly, the use of appearance engineering technology is coating, and protecting the appearance of furnace rolls has become a widespread phenomenon. According to different directions and temperatures, in order to meet the corresponding application requirements, coatings with corresponding functions are prepared, such as low-temperature supersonic spraying, medium-high temperature plasma or blasting spraying. […]
Development of foreign casting high speed steel rolls
Casting high-speed steel rolls were first successfully developed by the Japanese in 1988 and used in hot strip rolling mills. The United States began to introduce high-speed steel rolls in the early 1990s, and Europe started relatively late. High-speed steel rolls are generally defined as tool steels that have the ability to maintain hardness during […]
Preparations before replacing the furnace rolls
Preparations before replacing furnace rolls: (1) Before replacement, fully check the spreader body and the corresponding spreader head in advance (there are 4 spreader heads, which are selected according to the diameter and use of the roller, such as the deviation correction roller) to ensure its safe and reliable use (including hanging ornaments and Tightening […]
Advantages of furnace rolls
The quality of the furnace roll affects the quality of the product surface. The use of traditional graphite carbon cover and ceramic coated rolls is prone to roll surface oxidation, furnace roll nodules, and pineapple loosening, which affects normal production activities. The quartz ceramic hollow drum has the characteristics of high strength, high temperature resistance, […]
Study on Quenching Technology of New Type Forging High Speed Steel Roll Material
Modern large-scale cold strip rolling mills have achieved endless and semi-endless rolling. The requirements for the quality of strips, such as the surface flatness and thickness difference of cold-rolled strips, are getting higher and higher, and the quality requirements for work rolls are also getting higher and higher. The higher it is, the higher the […]
What are the factors that affect the scratch of the furnace roll?
In the production of furnace rolls, some small defects, such as sinking roll scratches, sometimes occur. How does this phenomenon happen? What are the influencing factors? In fact, there are many influencing factors. For example, in terms of equipment, there are generally the following reasons: a, The mechanical structure of the settling roll device should […]