The world No. 1 in crude steel production steel plant, over 70% of the HSS for bar and wire are from us.

High-speed steel rolls

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LMM GROUP, as an expert in roll production, is committed to providing high-quality, high-performance roll products to the global steel industry. We have rich experience and advanced technology to meet the needs of various steel rolling processes. Our rolls have the characteristics of high precision, high wear resistance and high fatigue resistance, which can significantly improve the output and product quality of steel rolling mills. Cooperation with us will provide you with stable, reliable and efficient roll solutions to help you achieve your business goals. We sincerely welcome you to contact us to learn more about our products and services. high speed steel rolls

Chemical Analysis

Material code C  Si Mn Ni Cr Mo V W
HSS 1.50-2.20 0.30-1.00 0.40-1.20 0.00-1.50 3.00-8.00 2.00-8.00 2.00-9.00 0.00-2.00
S-HSS 0.60-1.20 0.80-1.50 0.50-1.00 0.20-1.20 3.00-9.00 2.00-5.00 0.40-3.00 0.00-3.00

Physical Properties

Material code Barrel
hardness (HSD)
Roll neck
strength (Mpa)
Tensile strength (Mpa)
HSS 75-85 30-45 400-500
S-HSS 75-88 30-45 400-500

LMM GROUP Rolling Mill Rolls Materials:

High-quality rolling mill roll materials are the basis for ensuring roll quality. LMM GROUP usually uses materials with excellent properties such as high strength, high toughness, wear resistance, and high temperature resistance. Common raw materials include alloy steel, carbon steel, stainless steel, etc.

First-class equipment produces high-quality mill rolls:

  • Forging

Forging is one of the important links in roll manufacturing. Through forging, the internal structure of the material can be adjusted and the density and strength of the material can be improved. During the forging process, it is necessary to select the appropriate forging ratio and forging temperature, control the heating and cooling rates, and ensure that the internal structure and mechanical properties of the material meet the requirements.

  • Heat treatment

Heat treatment is one of the key links in roll manufacturing. Heat treatment can change the internal structure of the material and improve the strength and hardness of the material. Common heat treatment methods include quenching, tempering, nitriding, etc. During the heat treatment process, the heating temperature and cooling rate need to be controlled to ensure that the material reaches the required hardness and strength.

  • Machining

Machining is one of the important links in roll manufacturing. Through machining, the roll surface and dimensional accuracy that meet the requirements can be processed. Common machining methods include turning, milling, grinding, etc. During the machining process, it is necessary to select appropriate tools and cutting parameters to ensure processing quality and efficiency.

  • Surface treatment

Surface treatment is one of the last steps in roll manufacturing. Surface treatment can improve the wear resistance and corrosion resistance of the roll. Common surface treatment methods include shot peening, carburizing and quenching, nitriding, etc. During the surface treatment process, the treatment temperature and time need to be controlled to ensure the treatment quality and effect.

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rolling mill rolls equipment

Research and development of high-quality mill rolls:

Since different steel mills have different requirements for the performance and specifications of rolls during the production process, LMM GROUP’s ability to customize rolls according to specific needs can greatly improve the production efficiency and product quality of steel mills.

  1. Research and develop new materials: Use high-strength, high-wear-resistant alloy materials to increase the service life of the rolls.
  2. Optimize product design: change the surface structure of the roll to increase rolling efficiency, reduce rolling force, and improve product quality.
  3. Strengthen technology research and development: Continuously invest in technology research and development to improve the level of roll manufacturing technology and processing technology. The introduction of advanced CNC machine tools and machining centers can increase the accuracy and processing efficiency of rolls.
  4. Provide personalized services: Provide personalized customized services according to the special needs of customers. For example, customized roll coating services are provided to improve the wear and corrosion resistance of the rolls.


Founded in 2007, LMM GROUP mainly produces all kinds of metallurgical rolls for various types of steel, bar, high-speed wire and strip hot and cold plate and strip rolling mills.

The company covers an area of 100,000 square meters, including two complete production lines for cast rolls and forged steel rolls, processing workshops, product research and development centers, testing centers, training centers and office buildings and other supporting facilities. The factory environment is very beautiful.

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

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We would be happy to help and advise if you have any questions or inquiries.