Material selection of rolling mill rolls used in large and medium section steel mills
Description：In view of the complex section of large and medium-sized
Professional Rolling mill rolls manufacturer with 20 years of production experience. 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.WE can provide characteristic service and differentiated products according to the different conditions of rolling mill.
WE can provide characteristic service and differentiated products according to the different conditions of rolling mill.
Produced by static duplex casting and differential harden heat treatment methods, which ensures the shell/core material matching the rolling condition.
After further heat treatment, the back-up rolls are of the following advantages:
Produced by vertical centrifugal casting method in most cases. Rolls of different type and material are of the following advantages:
Conventional Mill Rolls
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LMM is a company specialized in mill roll production and supply. With many years of experience and advanced production equipment, we can provide you with high-quality and reliable mill roll products.
Our rolling mill rolls are suitable for various metallurgical industry fields, including the production of bars, wire rods, section steel, strips, etc. We can customize rolls according to customers’ specific requirements and application scenarios to ensure their performance and life in various environments.
LMM 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 3-5times than normal cast iron rolls.
Chemical Analysis
| Designation of rolls | Material code | C | Si | Mn | Ni | Cr | Mo | Mg |
| CrMo indefinite chilled SG cast iron rolls | SG Ⅱ | 3.00-3.40 | 1.40-1.90 | 0.20-0.80 | 0.20-0.60 | 0.20-0.60 | ≥0.04 | |
| NiCrMo indefinite chilled SG cast iron rolls (Ⅰ) | SG Ⅳ | 3.00-3.40 | 1.40-1.90 | 0.40-0.80 | 0.50-1.00 | 0.20-0.60 | 0.20-0.60 | ≥0.04 |
| NiCrMo indefinite chilled SG cast iron rolls (Ⅱ) | SG Ⅴ | 3.00-3.40 | 1.40-1.90 | 0.40-0.80 | 1.10-2.00 | 0.30-1.00 | 0.20-0.60 | ≥0.04 |
Physical Properties
| Designation of rolls | Material code | Barel hardness (HSD) | Neck hardness (HSD) | Tensile strength (Mpa) | |||
| CrMo indefinite chilled SG cast iron rolls | SG Ⅱ | 50-70 | 35-55 | >320 | |||
| NiCrMo indefinite chilled SG cast iron rolls (Ⅰ) | SG Ⅳ | 55-70 | 35-55 | >320 | |||
| NiCrMo indefinite chilled SG cast iron rolls (Ⅱ) | SG Ⅴ | 60-70 | 35-55 | >320 | |||
Chemical Analysis
| Designation of rolls | Material code | C | Si | Mn | Ni | Cr | Mo | |
| Centrifugal cast iron roll Ⅰ | HCr Ⅰ | 3.00-3.30 | 0.30-1.00 | 0.50-1.20 | 0.70-1.70 | 12.00-15.00 | 0.70-1.50 | |
| Centrifugal cast iron roll Ⅱ | HCr Ⅱ | 3.00-3.30 | 0.30-1.00 | 0.50-1.20 | 0.70-1.70 | 15.01-18.00 | 0.70-1.50 | |
| Centrifugal cast iron roll Ⅲ | HCr Ⅲ | 3.00-3.30 | 0.30-1.00 | 0.50-1.20 | 0.70-1.70 | 18.01-22.00 | 1.51-3.00 | |
Physical Properties
| Designation of rolls | Material code | Barrel hardness (HSD) | Neck hardhess (HSD) | Tensile strength (Mpa) | ||||
| Centrifugal cast iron roll Ⅰ | HCr Ⅰ | 60-75 | 32-45 | >350 | ||||
| Centrifugal cast iron roll Ⅱ | HCr Ⅱ | 65-80 | 32-45 | >350 | ||||
| Centrifugal cast iron roll Ⅲ | HCr Ⅲ | 75-90 | 32-45 | >350 | ||||
Chemical Analysis
| Designation of rolls | Material code | C | S | Mn | Ni | Cr | Mo | Mg |
| Pearlitic ductile cast iron roll (Ⅰ) | SGP Ⅰ | 3.00-3.40 | 1.40-1.90 | 0.40-0.80 | 1.50-2.00 | 0.20-0.60 | 0.20-0.60 | ≥0.04 |
| Pearlitic ductile cast iron roll (Ⅱ) | SGP Ⅱ | 3.00-3.40 | 1.20-2.00 | 0.40-0.80 | 2.01-2.50 | 0.20-1.00 | 0.20-0.60 | ≥0.04 |
| Pearlitic ductile cast iron roll (Ⅲ) | SGP Ⅲ | 3.00-3.40 | 1.00-2.00 | 0.40-0.80 | 2.51-3.00 | 0.20-1.20 | 0.20-0.60 | ≥0.04 |
Physical Properties
| Designation of rolls | Material code | Barrel hardness （HSD) | Neck hardness（HSD) | Tensile strength (Mpa) | ||||
| Pearlitic ductile cast iron roll (Ⅰ) | SGP Ⅰ | 45-55 | 35-55 | >450 | ||||
| Pearlitic ductile cast iron roll (Ⅱ) | SGP Ⅱ | 55-65 | 35-55 | >450 | ||||
| Pearlitic ductile cast iron roll (Ⅲ) | SGP Ⅲ | 62-72 | 35-55 | >450 | ||||
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 | |||
Chemical Analysis
| Designation of rolls | Material code | C | Si | Mn | Ni | Cr | Mo |
| CS | HCrS | 1.00-1.80 | 0.40-1.00 | 0.50-1.00 | 8.00-15.00 | 0.50-1.50 | 1.50-4.50 |
Physical Properties
| Designation of rolls | Material code | Barrel hardness (HSD) | Neck hardness (HSD) | Tensile strength (Mpa) | |||
| CS | HCrS | 70-85 | 35-45 | ≥450 | |||
Chemical Analysis
| Designation of rolls | Material code | C | Si | Mr | Ni | Cr | Mo |
| ZuB140CrNiMo | AD140 Ⅰ | 1.30-1.50 | 0.30-0.60 | 0.70-1.10 | 0.50-1.20 | 0.80-1.20 | 0.20-0.60 |
| ZuB160CrNiMo | AD160 Ⅰ | 1.50-1.70 | 0.30-0.60 | 0.80-1.30 | ≥0.20 | 0.80-2.00 | 0.20-0.60 |
| ZuB180CrNiMo | AD180 | 1.70-1.90 | 0.30-0.80 | 0.60-1.10 | 0.20-2.00 | 0.80-1.50 | 0.20-0.60 |
| ZuB190CrNiMo | AD190 | 1.80-2.00 | 0.30-0.80 | 0.60-1.20 | 1.00-2.00 | 1.50-3.50 | 0.20-0.50 |
| ZuB200CrNiMo | AD200 | 1.90-2.10 | 0.30-0.80 | 0.80-1.20 | 0.60-2.50 | 0.60-2.00 | 0.20-0.80 |
Physical Properties
| Designation of rolls | Material code | Barrel hardness （HSD） | Neck hardness （HSD） | Tensife strength （Mpa） | |||
| ZuB140CrNiMo | AD140 Ⅰ | 35-50 | ≤60 | 500-800 | |||
| ZuB160CrNiMo | AD160 Ⅰ | 40-60 | ≤50 | 500-800 | |||
| ZuB180CrNiMo | AD180 | 45-60 | ≤50 | 450-700 | |||
| ZuB190CrNiMo | AD190 | 50-65 | ≤50 | 450-700 | |||
| ZuB200CrNiMo | AD200 | 50-65 | ≤50 | 450-700 | |||
Chemical Analysis
| Designation of rolls | Material code | C | Si | Mn | Ni | Cr | Mo |
| ZuS140CrNiMo | GS140 | 1.30-1.50 | 1.30-1.60 | 0.50-0.80 | 0.40-0.70 | 0.20-0.50 | |
| ZuS160CrNiMo | GS160 | 1.50-1.70 | 0.80-1.50 | 0.60-1.00 | 0.20-1.00 | 0.50-1.50 | 0.20-0.80 |
| ZuS190CrNiMo | GS190 | 1.80-2.00 | 0.80-1.50 | 0.60-1.00 | 0.60-2.20 | 0.50-2.00 | 0.20-0.80 |
Physical Properties
| Designation of rolls | Material code | Barrel hardness (HSD) | Neck hardness (HSD) | Tensile strength (Mpa) | |||
| ZuS140CrNiMo | GS140 | 36-46 | ≤46 | ≥540 | |||
| ZuS160CrNiMo | GS160 | 45-55 | ≤50 | ≥500 | |||
| ZuS190CrNiMo | GS190 | 50-65 | ≤50 | ≥450 | |||
Chemical Analysis
| Designation of rolls | Material code | C | Si | Mn | Ni | Cr | Mo | |
| Centrifugal cast iron roll Ⅰ | HCr Ⅰ | 3.00-3.30 | 0.30-1.00 | 0.50-1.20 | 0.70-1.70 | 12.00-15.00 | 0.70-1.50 | |
| Centrifugal cast iron roll Ⅱ | HCr Ⅱ | 3.00-3.30 | 0.30-1.00 | 0.50-1.20 | 0.70-1.70 | 15.01-18.00 | 0.70-1.50 | |
| Centrifugal cast iron roll Ⅲ | HCr Ⅲ | 3.00-3.30 | 0.30-1.00 | 0.50-1.20 | 0.70-1.70 | 18.01-22.00 | 1.51-3.00 | |
Physical Properties
| Designation of rolls | Material code | Barrel hardness (HSD) | Neck hardhess (HSD) | Tensile strength (Mpa) | ||||
| Centrifugal cast iron roll Ⅰ | HCr Ⅰ | 60-75 | 32-45 | >350 | ||||
| Centrifugal cast iron roll Ⅱ | HCr Ⅱ | 65-80 | 32-45 | >350 | ||||
| Centrifugal cast iron roll Ⅲ | HCr Ⅲ | 75-90 | 32-45 | >350 | ||||
Chemical Analysis
| Designation of rolls | Material code | C | Si | Mn | Ni | Cr | Mo | Mg | |
| Bainite ductile cast iron roll Centrifugal (Ⅰ) | SGA Ⅰ | 3.00-3.40 | 1.20-2.20 | 0.40-0.80 | 3.01-3.50 | 0.20-0.80 | 0.50-1.00 | ≥0.04 | |
| Bainite ductile cast iron roll Centrifugal (Ⅱ) | SGA Ⅱ | 3.00-3.40 | 1.00-2.00 | 0.40-0.80 | 3.51-4.50 | 0.20-1.00 | 0.50-1.00 | ≥0.04 | |
Physical Properties
| Designation of rolls | Material code | Barrel hardhess (HSD) | Neck hardness (HSD) | Tensiie strength (Mpa) | ||||
| Bainite ductile cast iron roll Centrifugal (Ⅰ) | SGA Ⅰ | 55-78 | 32-45 | >350 | ||||
| Bainite ductile cast iron roll Centrifugal (Ⅱ) | SGA Ⅱ | 60-80 | 32-45 | >350 | ||||
Chemical Analysis
| Designation of rolls | Material code | C | S | Mn | Ni | Cr | Mo |
| NiCrMo chilled cast iron rolls (Ⅰ) | CC Ⅰ | 3.00-3.40 | 0.30-0.80 | 0.20-1.00 | 0.50-1.00 | 0.20-0.60 | 0.20-0.60 |
| NiCrMo chilled cast iron rolls (Ⅱ) | CC Ⅱ | 3.00-3.40 | 0.30-0.80 | 0.20-1.00 | 1.10-2.00 | 0.30-1.20 | 0.20-0.60 |
| NiCrMo chilled cast iron rolls (Ⅲ) | CC Ⅲ | 3.00-3.40 | 0.30-0.80 | 0.20-1.00 | 2.10-3.00 | 0.50-1.50 | 0.20-0.60 |
| NiCrMo chilled cast iron rolls (Ⅳ) | CC Ⅳ | 3.00-3.40 | 0.30-0.80 | 0.20-1.00 | 3.10-4.00 | 0.50-1.70 | 0.20-0.60 |
Physical Properties
| Designation of rolls | Material code | Barrel hardness （HSD) | Neck hardness (HSD) | Tensile strength (Mpa) | |||
| NiCrMo chilled cast iron rolls (Ⅰ) | CC Ⅰ | 60-70 | 32-50 | >150 | |||
| NiCrMo chilled cast iron rolls (Ⅱ) | CC Ⅱ | 62-75 | 35-52 | >150 | |||
| NiCrMo chilled cast iron rolls (Ⅲ) | CC Ⅲ | 65-80 | 32-45 | >350 | |||
| NiCrMo chilled cast iron rolls (Ⅳ) | CC Ⅳ | 70-85 | 32-45 | >350 | |||
Chemical Analysis
| Designation of rolls | Material code | C | S | Mn | Ni | Cr | Mo | Mg |
| Pearlitic ductile cast iron roll (Ⅰ) | SGP Ⅰ | 3.00-3.40 | 1.40-1.90 | 0.40-0.80 | 1.50-2.00 | 0.20-0.60 | 0.20-0.60 | ≥0.04 |
| Pearlitic ductile cast iron roll (Ⅱ) | SGP Ⅱ | 3.00-3.40 | 1.20-2.00 | 0.40-0.80 | 2.01-2.50 | 0.20-1.00 | 0.20-0.60 | ≥0.04 |
| Pearlitic ductile cast iron roll (Ⅲ) | SGP Ⅲ | 3.00-3.40 | 1.00-2.00 | 0.40-0.80 | 2.51-3.00 | 0.20-1.20 | 0.20-0.60 | ≥0.04 |
Physical Properties
| Designation of rolls | Material code | Barrel hardness （HSD) | Neck hardness（HSD) | Tensile strength (Mpa) | ||||
| Pearlitic ductile cast iron roll (Ⅰ) | SGP Ⅰ | 45-55 | 35-55 | >450 | ||||
| Pearlitic ductile cast iron roll (Ⅱ) | SGP Ⅱ | 55-65 | 35-55 | >450 | ||||
| Pearlitic ductile cast iron roll (Ⅲ) | SGP Ⅲ | 62-72 | 35-55 | >450 | ||||
Chemical Analysis
| Designation of rolls | Material code | C | Si | Mn | Ni | Cr | Mo | |
| Zu60CMoMn | AS60 | 0.55-0.65 | 0.20-0.45 | 0.90-1.20 | 0.80-1.20 | 0.20-0.45 | ||
| Zu60CrMoMnNi | AS60 Ⅰ | 0.55-0.65 | 0.20-0.60 | 0.50-1.00 | 0.20-1.50 | 0.80-1.20 | 0.20-0.60 | |
| Zu65CrNiMo | AS65 Ⅰ | 0.60-0.70 | 0.20-0.60 | 0.50-0.80 | 0.20-0.50 | 0.80-1.20 | 0.20-0.45 | |
| Zu70Mn | AS70 | 0.65-0.75 | 0.20-0.45 | 0.80-1.40 | ||||
| Zu70Mn2 | AS70 Ⅰ | 0.65-0.75 | 0.20-0.45 | 1.40-1.80 | ||||
| Zu70Mn2Mo | AS70 Ⅱ | 0.65-0.75 | 0.20-0.45 | 1.40-1.80 | 0.20-0.45 | |||
| Zu75CrMo | AS75 | 0.70-0.80 | 0.20-0.45 | 0.60-0.90 | 0.75-1.00 | 0.20-0.45 | ||
| Zu75CrNiMnMo | AS75 Ⅰ | 0.70-0.80 | 0.20-0.70 | 0.70-1.10 | ≥0.20 | 0.80-1.50 | 0.20-0.60 | |
Physical Properties
| Designation of rolls | Material code | Barrel hardness （HSD) | Neck hardness (HSD) | Tensile strength (Mpa) | ||||
| Zu60CMoMn | AS60 | 35-50 | ≤45 | >650 | ||||
| Zu60CrMoMnNi | AS60 Ⅰ | 35-45 | ≤45 | >750 | ||||
| Zu65CrNiMo | AS65 Ⅰ | 35-45 | ≤45 | >750 | ||||
| Zu70Mn | AS70 | 32-42 | ≤45 | >650 | ||||
| Zu70Mn2 | AS70 Ⅰ | 35-45 | ≤45 | >680 | ||||
| Zu70Mn2Mo | AS70 Ⅱ | 35-45 | ≤45 | >700 | ||||
| Zu75CrMo | AS75 | 35-50 | ≤45 | >700 | ||||
| Zu75CrNiMnMo | AS75 Ⅰ | 35-50 | ≤45 | >800 | ||||
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High-speed steel rolls developed by LMM the amount of steel passing in a single groove (times) is 3 to 5 times that of cast iron rolls.
Perfect production process
Cast rolls technical Process:
Modeling → smelting → centrifugal casting → cleaning → preliminary heat treatment → rough machining → differential heat treatment → finishing → packaging and delivery.
Processing Equipment
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The company strictly according to modern enterprise management requirements set up a perfectquality assurance system, and passed the ISO9001:2008 quality management system certification,ISO14001:2004 environmental management system certification, OHSAS18001:1999 occupationalhealth and safety management system certification.
With the globalization of the market strategy, information-based marketing system, high efficient and accurate market response, to promote market position. The products and projects of LMM Group have been exported to more than 90 countries and regions. Overseas warehouses and overseas branches have been successively established in the United States, Switzerland, Mexico, Germany, Iran, Turkey and other coun-tries. No matter when and where, LMM has always uphold the concept of quality service, take the initiative to communicate with customers by heart, rapid response, know the customer needs, to provide value-add-ed services to customers.
Classified according to the temperature when the rolled material is rolled
Classification according to the shape of rolled products
The rolled hot strip products are called hot strip rolls, and so on, there are: cold strip rolls, plate steel rolls, section steel rolls, seamless steel tube rolls, rod and wire rolls, etc.
Classification according to the function or position of the rolling mill on the rolling line
The blanking rolls used in the blanking mill are called blanking rolls, and so on, there are rough rolls, middle rolls, pre-finishing rolls, finishing rolls,
Finishing front rolls, finishing rolls, cross cut skinning rolls, slitting skinning rolls, slitting rolls, vertical rolls, edge rolling rolls, piercing rolls, tube rolling rolls, stripping rolls, tension reducing rolls, straightening Roller etc.
Classification according to the position of the roll on the rolling mill
The rolls that are in direct contact with the rolled material are called work rolls.
The roll that supports the rolling mill is called the back-up roll, and the roll that is farthest from the work roll in the multi-roll mill is called the back-up roll.
The roll between the work roll and the back-up roll in a multi-roll mill is called an intermediate roll.
Classified by roll material
According to the classification of materials, the rolls are divided into four categories: cast steel rolls, cast iron rolls, forged steel rolls and powder metallurgy rolls, and they are subdivided according to the material and main alloying elements of the working parts of the rolls.
Description：In view of the complex section of large and medium-sized
Description: This article introduces their respective working conditions about cold
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