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With the development of the steel product market, more and more suppliers spend much time with the desire for advanced standard quality steel products. Spheroidal graphite cast iron roll can be considered one of the steel products with the most highly competitive market. How to find a reliable mill rolls manufacturers for Alloy Spheroidal Graphite Iron Roll is important. Firstly, we should learn about the basic knowledge about the cast iron rolls.
What are the Spheroidal Graphite Cast Iron Roll
The Spheroidal graphite cast iron roll also called nodular cast iron roll or Ductile Iron Rolls are applied in hardness & composition mills producing different steel products. The cast iron roll is structurally made up of cementite and nodular graphite. Sufficient water cooling is a necessity for satisfactory performance. The matrix structure varies from Ferrito-Pearlitic, Pearlitic to Bainitic & Martensitic together with different carbide contents and graphite in the form of spheroids/nodules. Some critical grades are heat treated for higher strength.
The kinds of the Spheroidal Graphite Cast Iron Roll
There’re four kinds of alloy chilled cast iron rolls depending on the Physical Properties, wear resistance, hardness and strength.
Pearlitic Nodular Cast Iron Roll
Pearlitic nodular iron roll mixes cast iron with nickel, chromium, molybdenum nodular cast iron, through special heat treatment. The cast iron roll has good strength, high-temperature performance and anti accident performance, small hardness drop on the work layer with the standard of ISO, GB, ASTM, DIN, JIS.
Chemical Composition
Roll name | C | Si | Mn | Cr | Ni | Mo | Mg |
AF1 | 3.00~3.50 | 1.60~2.40 | 0.40~1.00 | 0.10~0.40 | 1.20~2.00 | 0.20~0.60 | ≥0.04 |
AF2 | 3.00~3.50 | 1.40~2.20 | 0.40~1.00 | 0.20~1.00 | 1.50~2.50 | 0.30~0.80 | ≥0.04 |
AF3 | 3.00~3.50 | 1.20~2.0 | 0.40~1.00 | 0.20~1.00 | 2.00~3.00 | 0.30~0.80 | ≥0.04 |
Physical Properties
Roll name | Roll-body hardness HSD | Tensile strength Mpa |
AF1 | 40~55 | ≥360 |
AF2 | 50~65 | ≥360 |
AF3 | 60~72 | ≥360 |
Application
Large blanking machine.
Section steel tandem rolling.
Bar and wire rough rolling.
Intermediate rolling mill.
Centrifugal Composite Cast Iron Roll
The cast iron rolls are high-speed steel rolls, produced by horizontal centrifugal casting process, are all compound rolls with high-speed steel as the work layer and nodular iron as the core. The material of centrifugal composite cast iron roll contains plenty of alloying elements such as Mo, Ni, Cr, etc. The high hardened eutectic carbides & second carbides, evenly distributed in tempered martensitic matrix, make the wear and thermal cracking resistance very excellent. Besides, the resistance to surface roughing is also good.
Chemical Composition
Roll name | C | Si | Mn | P | S | Ni | Cr | Mo | Mg |
Ni-Cr-Mo semi-chilled cast iron centrifugal composite roll | 2.90~3.60 | 0.30~0.80 | 0.20~0.50 | ≤0.40 | ≤0.10 | 3.01~4.50 | 0.50~1.70 | 0.20~0.60 | / |
Ni-Cr-Mo infinite chilled nodular cast iron centrifugal composite roll | 2.90~3.60 | 0.60~1.00 | 0.50~1.00 | ≤0.20 | ≤0.10 | 3.01~5.00 | 1.00~2.00 | 0.20~0.60 | / |
Ni-Cr-Mo nodular cast iron centrifugal composite roll（II） | 2.90~3.60 | 1.00~2.20 | 0.40~0.70 | ≤0.10 | ≤0.10 | 2.51~3.50 | 0.10~0.60 | 0.40~1.00 | ＞0.04 |
Ni-Cr-Mo nodular cast iron centrifugal composite roll（III） | 2.90~3.60 | 1.00~2.20 | 0.40~0.70 | ≤0.10 | ≤0.03 | 3.51~4.50 | 0.20~0.80 | 0.40~1.00 | ＞0.04 |
Cr-Mo chilled nodular composite cast iron roll | 3.20~3.70 | 0.50~1.20 | 0.50~1.00 | ≤0.40 | ≤0.03 | / | 0.20~0.80 | 0.20~0.60 | ＞0.04 |
Ni-Cr-Mo chilled nodular composite cast iron roll | 3.20~3.70 | 0.50~1.20 | 0.50~1.00 | ≤0.40 | ≤0.03 | 0.50~1.00 | 0.20~0.80 | 0.20~0.60 | ＞0.04 |
Ferrite nodular composite cast iron roll | 2.90~3.60 | 1.00~2.20 | 0.50~1.00 | ≤0.10 | ≤0.03 | 1.00~3.00 | 0.10~0.60 | 0.40~1.00 | ＞0.04 |
Physical Properties
Roll name | Metallographic Structure |
Ni-Cr-Mo semi-chilled cast iron centrifugal composite roll | Martensite + a little bainite +cementite |
Ni-Cr-Mo infinite chilled nodular cast iron centrifugal composite roll | Bainite + a little martensite +cementite + a little graphite |
Ni-Cr-Mo nodular cast iron centrifugal composite roll（II） | Bainite + a little austenite +cementite + nodular graphite |
Ni-Cr-Mo nodular cast iron centrifugal composite roll（III） | Bainite + a little austenite +cementite + nodular graphite |
Cr-Mo chilled nodular composite cast iron roll | Pearlite + cementite + a little graphite |
Ni-Cr-Mo chilled nodular composite cast iron roll | Pearlite + cementite + a little graphite |
Ferrite nodular composite cast iron roll | Pearlite + a little ferrite + cementite + a little graphite |
Pearlite nodular composite cast iron roll | Pearlite + cementite + a little graphite |
Application
working roll for hot-rolled strip leveling rack.
Rack of tandem rolling mill for section, bar, wire rod and narrow strip.
Roll ring and roll of stretch reducing mill for seamless steel tube.
Work roll of hot-rolled strip tempering rack and medium plate mill rack.
Tandem rolling bar and rack of high-speed wire mill.
Alloy Ductile Cast Iron Roll
The alloy ductile cast iron roll is made of acicular nodular cast iron mixing with nickel, chromium, molybdenum through a special heat treatment to obtain the ductile iron rolls.
Chemical Composition
Roll name | C | Si | Mn | P | S | Ni | Cr | Mo | Mg |
Cr-Mo semi chilled nodular cast iron roll | 3.20~3.70 | 1.00~2.50 | 0.50~1.00 | ≤0.20 | ≤0.03 | 0.20~0.60 | 0.20~0.60 | ＞0.04 | |
Cr-Mo infinite chilled nodular cast iron roll | 3.20~3.70 | 1.00~2.50 | 0.50~1.00 | ≤0.20 | ≤0.03 | 0.20~0.60 | 0.20~0.60 | ＞0.04 | |
Ni-Cr-Mo infinite chilled nodular cast iron roll(I) | 3.20~3.70 | 1.00~2.50 | 0.50~1.00 | ≤0.20 | ≤0.03 | 0.50~1.00 | 0.20~0.60 | 0.20~0.60 | ＞0.04 |
Ni-Cr-Mo infinite chilled nodular cast iron roll(II) | 3.20~3.70 | 1.00~2.50 | 0.50~1.00 | ≤0.20 | ≤0.03 | 1.01~3.00 | 0.30~1.20 | 0.20~0.60 | ＞0.04 |
Ni-Mo nodular cast iron roll(I) | 3.20~3.70 | 1.50~2.40 | 0.40~0.80 | ≤0.20 | ≤0.03 | 1.00~2.50 | 0.10~0.50 | 0.40~0.80 | ＞0.04 |
Ni-Mo nodular cast iron roll(II) | 3.20~3.70 | 1.20~2.40 | 0.40~0.80 | ≤0.20 | ≤0.03 | 2.51~3.50 | 0.10~0.50 | 0.40~1.00 | ＞0.04 |
Physical Properties
Roll name | Roll-body hardness HSD | Roll-neck hardness HSD | Tensile strength Mpa |
Cr-Mo semi chilled nodular cast iron roll | 40~55 | 32~50 | ＞300 |
Cr-Mo infinite chilled nodular cast iron roll | 55~70 | 35~55 | ＞300 |
Ni-Cr-Mo infinite chilled nodular cast iron roll(I) | 48~70 | 35~55 | ＞320 |
Ni-Cr-Mo infinite chilled nodular cast iron roll(II) | 48~70 | 35~55 | ＞320 |
Ni-Mo nodular cast iron roll(I) | 42~52 | 32~43 | ＞400 |
Ni-Mo nodular cast iron roll(II) | 55~75 | 35~55 | ＞400 |
Application
Blanking rolling mills roughing mills
Rolling mills before finishing rolling for section steel, bar, wire rod, narrow strips and plate steels.
work roll for seamless steel tube rolling mill
Bainitic Nodular Cast Iron Roll
Bainite ductile cast iron roll is made of Ni, Mn, CrH, Mo, etc with acicular structure(Bainite and a few Martensite) and would be higher strength and better toughness than pearlite ductile iron roller, besides, the wear resistance is improved much obviously.
Due to the high alloy content and high casting stress, the acicular bainite ductile iron roll can obtain the ideal comprehensive performance by a centrifugal composite casting process.
The feature of bainitic nodular cast roll is that it shaped into graphite ball and its performance can be compared with that of alloy indefinite chilled roll, and its intensity is higher than that of infinite chilled one.
Chemical Composition
Roll name | C | Si | Mn | Cr | Ni | Mo | Mg |
AF1 | 3.00~3.50 | 1.60~2.40 | 0.40~1.00 | 0.10~0.40 | 1.20~2.00 | 0.20~0.60 | ≥0.04 |
AF2 | 3.00~3.50 | 1.40~2.20 | 0.40~1.00 | 0.20~1.00 | 1.50~2.50 | 0.30~0.80 | ≥0.04 |
AF3 | 3.00~3.50 | 1.20~2.0 | 0.40~1.00 | 0.20~1.00 | 2.00~3.00 | 0.30~0.80 | ≥0.04 |
Physical Properties
Roll name | Roll-body hardness HSD | Tensile strength Mpa |
AF1 | 40~55 | ≥360 |
AF2 | 50~65 | ≥360 |
AF3 | 60~72 | ≥360 |
Application
This kind of cast iron rolls is often used for rest energy casting.
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 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.
