HSS Rolls

High-speed steel rolls

HSS rolls generally have a single-groove (time) steel passing 3 to 5 times that of cast iron rolls, and the total steel passing can be guaranteed to exceed 4 times on average.

The development of new materials and new processes has a huge impact on the design and use of modern rolling mills and rolls.More and more outdated equipment has has stopped running.

To maximize the production efficiency of rolling mills, new generation roll materials such as high-speed steel rolls are increasingly used by modern rolling mills.

High-speed steel has high wear resistance and hardenability, especially red hardness at high temperatures, which makes high-speed steel more suitable for roll manufacturing materials.

At present, high-speed steel roll series products are widely used in:

● High-speed bar pre-finishing stand, finished product stand, finished product pre-rolling stand, pre-slicing stand, slitting stand of bar rolling mill

● High-speed wire rod mill pre-finishing mill

● Hot rolling narrow and medium wide steel rolling mill finishing mill

● Finishing stand of spring flat steel mill and small section steel mills such as angle steel and channel steel

Unique advantages of the HSS rolls

●The HSS rolls material contains high alloy elements such as vanadium, tungsten, chromium, molybdenum, niobium, etc. The types of carbides in the roll structure are mainly MC type and M2C type. Compared with ductile iron rolls and high-nickel-chromium rolls, the single-groove (time) steel passing is higher, which saves roll changing time, improves rolling mill operation rate, reduces roll consumption, reduces production costs, and improves the overall benefit of the factory.

●The HSS rolls have good thermal stability, and the roll surface has high hardness and good wear resistance at rolling temperature. ●The HSS rolls have good hardenability, and the hardness hardly decreases from the surface of the roll body to the inside of the working layer, thus ensuring that the roll has the same good wear resistance from the outside to the inside.

● During the use of the high-speed steel roll, under good cooling conditions, a thin and dense oxide film is formed on the surface of the roll body. This uniform, thin and dense oxide film can exist for a long time without falling off, making the high-speed steel roll wear-resistant. Sex is significantly improved. ● Since the core of the centrifugal casting high-speed steel roll is made of alloy ductile iron material, the strength of the roll neck is high

●The HSS rolls material has a high expansion coefficient and good thermal conductivity. While the roll wears a small amount of the groove during the rolling process, the hole shape continues to become smaller due to the expansion of the high-speed steel material itself. Therefore, the high-speed steel roll is rolling. During the rolling process, the change of the rolling groove is small, and the consistency of the pass size is maintained for a long time, especially when rolling bars or rebars, it is more conducive to control the negative tolerance of the rolling material.

Metallographic structure of HSS rolls and rolls of other materials

The performance of rolls depends on the microstructure of the final roll. Obtaining high-hardness granular carbide and fine matrix structure is the basic guarantee to improving roll performance.

It can be seen from the metallographic photos that the metallographic structure of the high-speed steel roll is much better than other materials in terms of the shape, quantity, size and distribution of carbides, as well as the matrix structure and grain size.

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Specialty

Our company has been focusing on the research of HSS rolls and HSS roll rings since 2007, is one of the earliest and largest enterprises specializing in the production of high-speed steel series products in China.

Innovation

weˊve been concentrated on the development and innovation of the production process and materials of them, and have obtained a number of HSS roll and HSS roll ring patents.

Reliable

The HSS rolls and roll rings produced by our company have been widely used in more than 300 rolling production lines in almost all large steel mills in China (Zhongtian Iron and Steel, Shagang Group, Hegang Group, etc.), and are exported to dozens of countries on five continents.

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advanced equipment

The company now has more than 100 sets of intermediate frequency furnaces, centrifuges, heat treatment furnaces, and CNC machining equipment.

high yield

In 2014, the annual production capacity was expanded to 15,000 tons. In 2020, the output of HSS rolls and roll ring series products exceeded 10,000 tons.

variety

At present, the company's products have covered: HSS rolls, reinforced HSS rolls, high-strength HSS rolls, super-strength HSS rolls, split HSS rolls, KOCKS roll rings, double high-bar roll rings, high-speed wire pre-finishing rolls Rings and pinch roller rings and other series.

Equipment Capability

Apply Effects Of HSS Rolls

High-speed steel rolls have higher steel passing per groove (times) due to their good wear resistance, which saves roll changing time, improves rolling mill operation rate, reduces roll consumption, and improve the overall efficiency of the factory. Generally, the amount of steel passing in a single groove (times) is 3 to 5 times that of cast iron rolls.

The following table shows the use effect of high-speed steel rolls on continuous bar rolling mills:

Usage Report Of HSS Rolls

The data shows that the amount of steel passing is more than 1.3 times higher than that of the existing rolls, and the wear of the rolling groove is small. If the batch is used for a long time, the amount of each turning will be reduced and the number of rolls used will be increased. The trial specification selected Φ14, it is inferred that the roll will be better when used in Φ16-20 specification.

Rizhao Steel Holding Group Co., Ltd.

Φ12 four-slicing, Φ14 three-slicing usage: The surface quality of the steel is good, the rolls have no lumps, no cracks, no pitting, and the rolls have remarkable wear resistance, which can guarantee two shifts to change the grooves once. The average amount of steel passing is about 50%-60% of the alloy roll, the processing difficulty is low, the processing cost is lower than that of the alloy roll, and our factory can achieve normal processing.

Sichuan Dazhou Iron and Steel Group Co., Ltd. Doe

The average amount of steel passing through a single channel of finishing rolling is 410 tons, that of pre-finishing is 840 tons, the amount of steel passing through a single group of slitting channels is 2860 tons, and that of pre-cutting is 2910 tons. There is no abnormal condition in the rolling groove, and the hardness of the roll is uniform, which is convenient for the repairing and processing of the rolling groove. Relevant technicians follow and guide on-site, and the rollers are used well in our factory.

Inner Mongolia Baotou Steel Union Co. LTD

The production difference of high-speed steel rolls is obvious in the use of splitting pass. The use of one rolling groove per shift has changed to one rolling groove using three shifts, which greatly reduces the parking time of the shift and the cost of using rolls, and reduces the change of middle and night shifts. roll. The better wear resistance is obvious in the use of 15# rolls. During the production process, the strip shape control is stable, the gap between the rolls is large, and the negative deviation fluctuation is small, which has a good effect on improving the quality of the finished product. At present, the use of ordinary rolls is 0.55 yuan/ton, and the use of high-speed steel rolls is 0.33 yuan/ton, which can greatly reduce costs and increase workshop profits.

Jiangsu Shagang GrouDoe

Φ370mm high-speed steel rolls process Φ25mm rebar K1 hole, and produce according to the normal rolling rhythm (final rolling speed 8.6m/s). During this period, no roll cracking (dropping) occurred, which could cause the surface quality problem of the rebar. The amount of steel passing far exceeds the assessment value of the amount of steel passing through a single slot of 1,500 tons in the "Roll Ordering Technical Agreement", and the effect is good.

Chongqing Iron and Steel Co., Ltd.