ROLL TYPE:
BACK-UP ROLL,INTERMEDIATE ROLL & WORK ROLL
1. ALLOY INDEFINITE CHILLED CAST IRON ROLLS
◆ SUMMARY It is a kind of cast iron roll with fine intercrystalline graphite evenly distributed throughout its working layer. It is shaped by Centrifugal Casting Machine, or by gravity casting.
◆ CHARACTERISTICS |
◇ In its microstructure, the size, shape and distribution of graphite and carbide are controlled by chilling effect and the contents of alloy elements.
◇ The matrix microstructure can be changed from Bearlite, Bainite to Martensite through adding alloy
elements such as Manganese, Nickel, Chromium, Molybdenum etc.
◇ The small amount of fine graphite in its matrix enhances the roll’s resistance to brittle crack, thermal crack and its wearability.
◇ The small hardness gradient in roll’s working layer is suitable for usage in intermediate and finishing stands for bar, wire and section mills.
◆ APPLICATION
Used in intermediate or finishing stands for bar, wire and section mills.
◆ MECHANICAL PROPERTIES
Symbol | Hardness (HS) | Tensile strength (MPa) | Bending strength (MPa) |
IC0 | 58~70 | ≥160 | 300~400 |
IC1 | 60~72 | ||
IC2 | 62~72 | ≥200 | |
IC3 | 65~75 | ≥300 | 500~700 |
IC4 | 70~85 |
2. ALLOY CHILLED CAST IRON ROLLS
◆ SUMMARY It is a kind of cast iron roll with free graphite in the matrix of its working layer. It is shaped by Centrifugal Casting Machine, or by gravity casting.
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◆ CHARACTERISTICS
Alloy chilled cast iron roll has high hardness and excellent wearability
Its microstructure is fine pearlite and carbide.
◆ APPLICATION
It is suitable for finish stands for small bar, wire and section mills, as well as narrow strip mills.
◆ MECHANICAL PROPERTIES
Symbol | Hardness (HS) | Tensile strength (MPa) | Bending strength (MPa) |
CC1 | 60~70 | ≥150 | 300~400 |
CC2 | 60~75 | ≥160 | 300~400 |
CC3 | 65~80 | ≥300 | 500~700 |
CC4 | 70~85 | ≥300 | 500~700 |
3. ALLOY NODULAR CAST IRON ROLLS
◆ SUMMARY It is a kind of cast iron roll with free graphite in the matrix of its working layer, and made by gravity casting.
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◆ CHARACTERISTICS
◇ High hardness and excellent wearability.
◇ Microstructure of spherical graphite.
◇ Higher tensile strength than alloy indefinite chilled roll.
◆ MECHANICAL PROPERTIES & APPLICATION
Symbol | Hardness (HS) | Tensile strength (MPa) | Bending strength (MPa) | Application |
SG1 | 40~55 | ≥300 | 500~700 | Rougher of bar, wire and section mills. |
SG3 | 55~70 | ≥300 | 500~700 | |
SG5 | 60~70 | ≥300 | 600~800 | Finish stands of small section mills and narrow hot strip mills. |
SG6 | 62~70 | ≥320 | 600~800 | |
SHD1 | 58~70 | ≥300 | 600~800 | Folding sheet mill |
SGD2 | 58~70 | ≥300 | 600~800 |
4. PEARLITIC NODULAR CAST IRON ROLLS
◆ SUMMARY It is a kind of nodular cast iron roll with pearlitic matrix in its microstructure, obtained by adding alloy elements of Ni、Cr、Mo and using special heat treatment. It is shaped by Centrifugal Casting Machine, or by gravity casting. |
◆ CHARACTERISTICS
◇ High strength
◇ Good thermal stability
◇ Resistance to impact
◇ Small hardness gradient of working layer
◆ APPLICATION
◇ Blooming mills
◇ Rougher and intermediate stands of bar, rod and section mills
◆ MECHANICAL PROPERTIES
Symbol | Hardness (HS) | Tensile strength (MPa) | Bending strength (MPa) |
SGP1 | 40~55 | ≥350 | 800~1000 |
SGP2 | 50~65 | ||
SGP3 | 60~72 |
5. BAINITIC NODULAR CAST IRON ROLLS
◆ SUMMARY It is a kind of nodular cast iron roll with acicular (Bainitie-Martensite) matrix in its microstructure, obtained by adding alloy elements of Ni、Cr、Mo and using special heat treatment. It is shaped by Centrifugal Casting Machine, or by gravity casting.
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◆ CHARACTERISTICS
◇ High strength — higher than Pearlitic Nodular Cast Iron Roll
◇ High toughness — higher than Pearlitic Nodular Cast Iron Roll
◇ Good wearability — better than Pearlitic Nodular Cast Iron Roll
◆ APPLICATION
◇ Finish stands of bar, rod, small section mills.
◇ Finish stands of narrow hot strip mills.
◇ Pre-finish stands of wire mills.
◆ MECHANICAL PROPERTIES
Symbol | Hardness (HS) | Tensile strength (MPa) | Bending strength (MPa) |
SGB1 | 55~70 | ≥400 | 600~800 |
SGB2 | 62~80 |
6. NON CONTINUOUS CARBIDE ROLLS
◆ SUMMARY It is a kind of cast iron roll with acicular (Bainitie-Martensite) matrix in its microstructure, and made from high alloy materials of Ni, Mo with special heat treatment. It is shaped by Centrifugal Casting Machine, or by gravity casting. |
◆ DESCRIPTION
It is necessary for rougher roll that a combination of some properties such as strength, hardness, toughness and wearability at high temperature, as well as resistance of fire cracking and impact. Bainitie / Martensite (acicular) matrix is helpful to improve integrative properties.
Carbide content in the matrix is less than 5%, which is satisfactory to the requirement of roughers.
◆ APPLICATION
◇ Rougher of bar, rod, wire mills.
◆ MECHANICAL PROPERTIES
Symbol | Hardness (HS) | Tensile strength (MPa) | Bending strength (MPa) |
NCC1 | 40~50 | ≥520 | 970~1380 |
NCC2 | 50~60 |
7. CAST IRON ROLLS WITH GROOVE
This kind of roll is developed with special technology of SINO STEEL
◆ ADVANTAGE
◇ Small hardness difference between barrel surface and groove surface.
◇ Good surface quality of rolled products.
◇ Long service life.
◆ APPLICATION
◇ Intermediate and large sections mills.
◇ Large bar mills.
CAST IRON ROLL
