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Development and production status of high-speed steel rolls

Development and production status of high-speed steel rolls

High-speed steel rolls development and production status High-speed steel rolls are a type of hot rolling roll material with a shorter history, faster development, and broader application prospects. High-speed steel, also known as wind steel or sharp steel, means that it can be hardened even when cooled in air during quenching, and it is very sharp. It is a complex alloy steel containing carbide-forming elements such as tungsten, molybdenum, chromium, and vanadium. The total amount of alloying elements is about 10%~25%. The application of high-speed steel rolls is an important part of the development of modern steel rolling production. This is another major change in the development of the steel industry following micro-alloying, controlled rolling, and cooling technology. In Japan, high-speed steel rolls have been widely used in the steel rolling production of plates, profiles, bars, and wires, and are used not only for work rolls but also for support rolls. The good wear resistance of high-speed steel rolls is inseparable from its characteristics different from traditional rolls. The unit price of high-speed steel rolls is indeed higher than that of high-boron and high-nickel chromium rolls, but due to material characteristics, the steel throughput capacity of high-speed steel rolls is far higher than that of high-boron and high-nickel chromium rolls, such as 12 quarter-cut threaded steel bars, high-speed steel K1 single-groove steel throughput capacity 350 tons, high-boron only 150 tons, high-nickel chromium only 100 tons; high-speed steel K3 single-group can steel output is 2800 tons, high-boron contains

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A Brief History of Roll Development

A Brief History of Roll Development

The types and manufacturing processes of rolls have continuously developed with the advancement of metallurgical technology and the evolution of rolling equipment. In the Middle Ages, low-strength gray cast iron rolls were used when rolling soft non-ferrous metals. In the mid-18th century, Britain mastered the production technology of cold-hard cast iron rolls used for rolling steel plates. In the second half of the 19th century, the advancement of steelmaking technology in Europe required the rolling of larger tonnage steel ingots, and the strength of both gray cast iron and cold-hard cast iron rolls could no longer meet the requirements. Ordinary cast steel rolls with a carbon content of 0.4%~0.6% were correspondingly born. The emergence of heavy forging equipment further improved the toughness and strength of forged rolls of this composition. In the early 20th century, the use of alloying elements and the introduction of heat treatment significantly improved the wear resistance and toughness of cast steel and forged steel hot and cold rolling rolls. The addition of molybdenum to cast iron rolls used for hot-rolled plates and strips improved the surface quality of the rolled material. The flushing method composite casting significantly improved the core strength of cast rolls.

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2022

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Performance requirements

Performance requirements

Generally, the main requirements for roughing rolls are strength and resistance to thermal cracking; the working rolls of a small 20-roll mill weigh only about 100 grams, while the supporting rolls of a wide and thick plate mill weigh over 200 tons. When selecting rolls, the main material (various grades of cast iron, cast steel, or forged steel, etc.) with safe load-bearing capacity is first selected based on the basic strength requirements of the rolling mill for the rolls.

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2022

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Roll selection

Roll selection

Common roll materials and uses are shown in the table. Roll performance and quality generally depend on its chemical composition and manufacturing method and can be evaluated by its microstructure, physical and mechanical properties, and the type of residual stress present inside the roll (see roll inspection). The performance of rolls in a rolling mill depends not only on the roll material and its metallurgical quality, but also on the operating conditions, roll design, and operation and maintenance. The operating conditions of rolls in different types of rolling mills vary greatly. The factors causing these differences are: (1) Mill conditions. Such as mill type, mill and roll design, roll pass design, water cooling conditions, and bearing types, etc.; (2) Rolling conditions such as the type and specifications of the rolled material and its deformation resistance, reduction schedule and temperature regime, production requirements and operation, etc.; (3) Requirements for product quality and surface quality, etc.

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2022

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Roll classification

Roll classification

There are various methods for classifying rolls, mainly including: (1) Classification by product type: strip rolls, section rolls, wire rolls, etc.; (2) Classification by position in the rolling mill series: roughing rolls, intermediate rolls, finishing rolls, etc.; (3) Classification by roll function: descaling rolls, piercing rolls, leveling rolls, etc.; (4) Classification by roll material: steel rolls, cast iron rolls, cemented carbide rolls, ceramic rolls, etc.; (5) Classification by manufacturing method: cast rolls, forged rolls, weld-clad rolls, inserted rolls, etc.; (6) Classification by the state of the rolled steel: hot rolls, cold rolls. Various classifications can be combined to give rolls a more specific meaning, such as high-chromium cast iron work rolls for hot-rolled strip steel produced by centrifugal casting.

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2022

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04

Introduction to some relevant issues of overlay welding rolls

Introduction to some relevant issues of overlay welding rolls

Rollers are the core components of a rolling mill. The use of rollers involves rolling mill selection, roller preparation, maintenance, and periodic dressing during the rolling process. These are all factors that affect the rolling mill's productivity, product quality, and economic efficiency. Because the rolling process is continuous, operators need to constantly check the condition of the rollers to ensure that the products meet the user's requirements for stricter tolerances and surface quality. To maintain product competitiveness, it is necessary to constantly require rolling mill operators to reduce production costs, i.e., increase rolling speed, increase the production flexibility of the rolling mill, and reduce roller consumption. So what should be paid attention to when overlay welding rollers?

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2022

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Some knowledge points about rolling mills

Some knowledge points about rolling mills

Cable tray rollers are an important component of cable tray equipment. What are the design and usage characteristics of cable tray rollers? The design and use of cable tray rollers have the following characteristics.

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