Commonly used work roll materials are alloy forged steel, alloy cast steel and cast iron, etc.
(1) Alloy forged steel. Alloy forged steel for rolls has been specified in China's national standards, and steels for hot rolling and cold rolling are listed in GB/T 13314-1991. The steel for hot rolling rolls has 55Mn2, 55Cr, 60CrMnMo, 60SiMnMo, etc. The steel for cold rolling rolls is 9Cr, 9Cr2, 9CrV, 9Cr2W, 9Cr2Mo, 60CrMoV, 80CrN13W, 8CrMoV, etc.
(2) Alloy cast steel. There are not many types of alloy cast steel used for rolls, and there is no uniform standard. With the development of electro slag remelting technology, the quality of alloy cast steel is gradually increasing, and the future meeting of cast steel rolls will be widely used.
(3) Cast iron. Cast iron can be divided into ordinary cast iron, alloy cast iron and ductile iron. When casting rolls, different casts can be used to obtain cast iron rolls of different hardness. Therefore, there are semi-cold rolls, chill rolls and infinite chill rolls:
-Semi-cold roll. There is no obvious white layer on the surface of the roll, and the surface hardness of the roll is HS≥50.
-Chill rolls. The surface has a distinct white layer, the core is a gray layer, the middle is a layer of hemp, and the surface hardness of the roll is HS≥60.
-Infinite chill roll. The surface is a white mouth layer, but there is no obvious boundary between the white mouth layer and the gray mouth layer, and the roll surface hardness is HS ≥ 65.
Cast iron rolls have high hardness, smooth surface and wear resistance, and the manufacturing process is simple and inexpensive. The disadvantage is that the strength is lower than that of steel rolls. Only the strength of the ductile iron roll is good.
Alloy Chilled Cast Iron Roll is one of the most popular iron rolls with a highly competitive market. Now, we introduce the basic knowledge about the alloy chilled cast iron roll
Alloy Chilled Cast Iron Roll
Alloy Chilled Cast Iron Rolls are mainly used in intermediate roll stand and finishing stand of the sheet, wire rod, section steel, pipe. Their body hardness HSD55-85, roll neck tensile strength 150-220Mpa. The iron rolls are made according to standard ISO, GB, ASTM, DIN, JIS. There is no free graphite in the working layer of alloy chill cast iron roll, it is featured as high hardness, good wear-resistance, the micro metallographic microstructure is fine pearlite and carbides.
Application
The finishing mill for section steel, wire rod, strip, thin plate, and bar;
The pre-finishing stands of high-speed wire;
The rolling ring of stretch reducing mill for seamless steel tube.
High-Cr Composite Spin-Cast Iron Roll
The high-chromium composite cast iron roll is made of wear-resistant high-chromium white cast iron as the outer layer material of the roll body. The ductile iron is generally used as the material of roll core and the roll neck. The high alloy composite cast iron roll produced by the centrifugal
Due to the presence of lath-shaped M7c3, eutectic carbide, chrysanthemum M2c eutectic carbide and granular M23C6 secondary carbide in the matrix, the high chromium composite cast iron roll has excellent wear resistance and high Resilience and impact resistance, thus it is widely used as the rough rolling and finishing rolling work rolls in the hot strip rolling mill, the wide and medium plate rolling mill. as well as the finishing rolling work rolls in the small section steel and sheet rolling mill.
Alloy Indefinite Chilled Cast Iron Roll
The Alloy Indefinite Chilled Cast Iron Roll is a kind of centrifugal composite spin-cast iron roll, it has a double chemical, the outside has high tensile strength and the inside is a lower one, the hardness drop is lower. It is usually used as work roll for the finishing mill to roll the angles, bars, flats and so on.
The indefinite chilled cast iron roll is a roll between chilled cast iron and grey cast iron with a carbon content of 2.5-3.5% and a silicon content of 0.7-1.6%. The structure of the roller body changes uniformly in the outward direction, and the chilled structure gradually transitions to the gray mouth structure, and the chill layer does not change significantly.
Application
work roll of bar & wire rod mill, hot strip mill, cold strip mill, PC mill, section mill, plate rolling mill, non-ferrous mill, etc.
High NiCr Indefinite Chilled Composite Spin-Cast Roll
High NiCr indefinite chilled composite spin-cast roll is a high nickel-chromium infinite chilled cast iron roll, which is produced by full flushing (overflow method) or centrifugal composite casting process. Its material contains high chromium, nickel and molybdenum alloy elements.
High NiCr indefinite chilled composite spin-cast roll has a double chemical, the outside has high tensile strength and the inside is a lower one, the hardness drop is lower, so it has high wear resistance. It is usually used for the finishing mill to roll the final material, to roll the angles, bars, flats and so on.
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If you want to find a trustworthy adamite roll supplier with long-term cooperation, maybe you need to concern about as the following
1.Mill rolls equipment
Mill rolls equipment plays an important role in the high quality rolling mill roll. Types of equipment matters from the beginning to the finished products. Compared with alloy cast steel roll, adamite roll has a good abrasion resistance through a special heat treatment process, so for the products, the equipment ever much more important.
2.Quality Control
Different stages of production have to follow controlling parameters to ensure that the production department is working with the required efficiency. To get the quality mill roll, quality is absolutely necessary
3. Technological Advancement of the manufacturer
A reliable manufacturer will focus on technological advancement for its long-lasting development. The advanced technology can guarantee the improvement of products. The best supplier not only can provide high-standard products but also is the steel solution provider. Before choosing the company you should ensure the manufacture has a professional team for advanced technology.
4. Delivery time and price of the company
Delivery time often is the main factor to choose the supplier. Delivery on-time is also the basis of next time cooperation. Checking out the place of the company and the delivery term is essential. Price is also an important element for a best-value mill roll manufacturer.
The high-speed development of the global steel industry makes more and more suppliers study intensively on advanced technology for high-standard steel products to customers. Concerning how to find the reliable mill rolls manufacturers to meet the requirements of the buyer for high-quality adamite rolls, firstly, we need to learn basic knowledge of the adamite roll
What are Adamite Rolls?
The Adamite roll also called adamite Steel Rolls has better strength and toughness than cast iron roll. It is widely used for work rolls in hot rolling mills. The adamite rolls are statically cast and go through multi-stage heat treatment process followed by Tempering phases in order to develop the combination of hardness, toughness and wear resistance.
Adamite rolls chemical composition
The adamite roll materials can be considered as composite materials of two phases of coarse carbides and matrix. As a consequence, the hardness of these roll materials may be markedly affected by the amount and hardness of coarse carbides. The carbon content of the alloy adamite roll is usually between 1.2-2.3% and the rest alloy elements contain Cr, Ni, Mo V, etc. The free carbide mass fraction is generally about 6% to 10% with small hardness drop, good wear resistance, good toughness, significantly reduced consumption. The Standard includes ISO, GB, ASTM, DIN, JIS.
Applications of Adamite Rolls
work roll
back-up roll
vertical roll for large-class
medium-class rough rolling mill
intermediate rolling mill of section steel and wire rod
Wire rod and bar steel roughing
hot rolling steel strip
To find a supplier for spheroidal graphite cast Iron roll is easy, but to find a trustworthy rolling mill roll manufacturer for the nodular cast iron roll with advanced technology and high quality, the things need to consider as below for your references.
1. composition and hardness for spheroidal graphite cast iron roll
nodular graphite material with excellent strength and hardness can withstand heavy loads, so the cast iron rolls require a wide range of composition and hardness with advanced technology. The manufacturer can provide superior heated technology for the ductile Iron Roll. So check the composition technology for the alloy spheroidal graphite cast Iron roll is necessary.
2. Product range
The spheroidal graphite cast iron roll can be used in hardness & composition for a variety of applications including wire rod roughing and intermediate rolling, slabbing and blooming mills and rail and structural mills with high tensile strength and deep hardness penetration. A nodular cast iron roll manufacturer will have the ability to provide a wide range of products to meet the different requirements and applications of customers.
3. Qualification Certification
The qualification certification for a steel plant is essential. As a mill roll requiring high-standard technology, the spheroidal graphite cast iron roll needs a different quality standard. Often the ISO is the most common standard. The other quality certification like GB, ASTM, DIN, JIS also need to be considered for choosing the supplier.
4.Deals and Discounts
The buyer for alloy spheroidal graphite cast iron roll often quote from several steel product suppliers. The best deals and discounts offered by the manufacturer also need to be considered for best-value products.
5. Delivery Time and Method
Delivery on-time is on the basis of cooperation and important for trade. Before choosing a trustworthy supplier, checking out the delivery term about the address of the factory and distribution, shipping method and time is necessary.
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