We can provide special services and differentiated products according to the different working conditions of the rolling mill.
Brand name: LMM GROUP
Packing Details : Wooden box with fumigation or Wooden Fram
Delivery Details: 30~60days or Based on the quantity
Shipping: Sea freight、Land freight、Air freight
LMM have been supplied to world’s top steel manufacturer Arcelormittal, TATA Steel, EZZ steel etc. We do OEM for Concast and Danieli for a long time
Process schedule with ETD date
QC checking of each process
Photos &videos of each process
ISO 9001 certificate
The third party Checking
Material: High strength high speed steel
Material Code: H3-A, H3-B, H3-W
This series of materials is a new type of wear-resistant material developed by our company based on the rolls under different production lines and working conditions. Roll barrel surface hardness: HSD82-89, hardness drop /10mm: ≤3HSD, small single regrinding value, and it can be used for 8-10 cycles. The total steel pass amount can reach 4 times than that of nodular cast iron rolls, and it is above 30% higher than that of the similar products in China. This material has very high abrasion resistance under thermal load. It can be used continuously 8-12 hours before changing grooves, effectively improving the operation rate, reducing the malfunction and energy consumption, and saving the labor intensity of workers. Meanwhile, there is no spall phenomenon and it is easy to be processed.
It is suitable for the finishing stand and leading stand of bar rolling line, the first four stands of high speed wire rod pre-finishing mill rolling line, the finishing stand and leading stand of flat steel and narrow strip steel rolling lines, and other small section steel rolling such as bar, wire rod and angle steels.
Applicable rolling temperature: 780℃-1050℃.
1) Carbide hardness is high.
The rolls used in the past mostly distributed Fe3C or M7C3 eutectic carbides on the matrix, with coarse structures and low hardness.
High-speed steel rolls generally use high-C, high-V high-speed steel. In addition, it also contains more alloying elements such as Cr, Mo, W, Nb and Co. During solidification and heat treatment, these alloying elements form primary and secondary carbides.
High chromium cast iron roll carbides are M7C3 (2500 Hv) and M23C6 (1600 Hv).
In infinite chilled cast iron rolls, the carbide is Fe3C (l300 Hv). The high-speed steel rolls mainly contain MC (3000 Hv), M7C3 (2500 Hv) and M6C (2000 Hv), which can replace ordinary rolls to improve wear resistance. In addition, with the increase of V content, the skeletal M6C carbide in the high-speed steel structure transforms into the granular VC type.
2) Good thermal stability.
High-speed steel rolls contain more elements such as W, Cr, Mo, V and Nb, and have better thermal stability. The study found that the hardness of ordinary roll material decreases significantly with the increase of temperature, while the high-speed steel roll still maintains 500 Hv at 600 °C, which will greatly improve the wear resistance of the roll. Especially when the Co element distributed in the matrix is added, this tendency is more obvious.
3) It is easy to form an oxide film during use.
During the rolling process, if a continuous, dense, uniform and well-bonded oxide film is formed on the surface of the roll, it can not only reduce the friction coefficient between the roll and the rolled material, but also improve the dimensional accuracy and surface quality of the rolled material. In the initial stage of use, ordinary rolls are more worn due to lack of oxide film protection. Oxide film can be formed quickly during the use of high-speed steel rolls. The appearance of oxide film can reduce the friction between the strip steel and the roll surface, prevent the roll from sticking to steel, and improve the life of the roll. Compared with ordinary rolls, the initial wear of high-speed steel rolls is lower, which is very beneficial for improving the wear resistance of high-speed steel rolls.
4) Good hardenability.
The high-speed steel roll has good hardenability. At room temperature, within 50mm of the working layer, the hardness drop from the roll surface to the core is less than 3HS, which can ensure that the roll has good wear resistance from the outside to the inside.
5) Excellent toughness.
Compared with ordinary infinite chilled cast iron, high chromium cast iron and semi-steel rolls, high speed steel rolls have better basic mechanical properties, tensile strength and fracture toughness than high chromium cast iron rolls and infinite chilled cast iron rolls. Close to semi-steel rolls.
6) Good thermal crack resistance.
Due to its unique structure characteristics, high-speed steel can effectively inhibit the formation and propagation of cracks. In actual use, it is found that high-speed steel rolls do have better thermal cracking resistance than high-chromium cast iron rolls. Therefore, if a general production accident occurs, the impact of the accident can be eliminated through the normal grinding amount or a small additional grinding amount, which simplifies the processing process and saves costs.
7) Good wear resistance.
Compared with semi-steel, high-chromium cast iron and high-nickel-chromium infinite chilled cast iron rolls, the rolling tonnage of high-speed steel rolls is greatly increased. The F1-F4 frame is about 10000t, and the F5 frame is about 6000t, which shows that the high-speed steel roll has good wear resistance. The increase in rolling tonnage of high-speed steel rolls has led to a significant decrease in roll consumption. Under the same rolling conditions, the roll consumption of high-speed steel rolls is 1/5 of high-chromium cast iron rolls in F1 frame, 1/7 of high-chromium cast iron rolls in F2 frame, and 1/7 of high-chromium cast iron rolls in F4 frame. 1/13 of the roll, F5 frame is 1/8 of the high nickel chromium infinite chilled cast iron roll. the
High-speed steel roll manufacturing technology, manufacturing high-speed steel roll mainly includes forging, casting, spray forming, hot isostatic pressing and other technologies. The popularization and use of forged high-speed steel rolls has progressed slowly; at present, the more common manufacturing methods of cast high-speed steel rolls in industrial production include centrifugal casting, continuous casting outer layer forming, electroslag remelting and liquid metal electroslag welding.
Our Client Say?
The trial data shows that the ∮370mm high-speed steel roll produced by LMMGROUP has far exceeded the single-groove assessment value of 1,500 tons in the “Roll Ordering Technical Agreement”, and the effect is good.
On September 10, 2015, in the rolling process of the steel rolling mill, the LMMGROUP high-speed steel bar rolling experiment was carried out on the first bar line C12 to four cuts, and C14 three cuts to K1, K2, K3, and K4. According to the trial situation, The average amount of steel passing through LMMGROUP rolling is about 50%-60% of the alloy rolling spoke. The processing difficulty of high-speed steel is low, and the processing cost is lower than that of the alloy rolling wheel. Our factory can achieve normal processing.
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