Centrifugal Composite Cast Iron Roll
Higher content of Ni and Mo alloys, basanite and martensite matrixes with excellent performance are produced. There are small changes in hardness of centrifugal chilled iron roll. It is extremely efficient in toughnessm preserving heat split, preserving surface coarse and abrasion-resistant.
Introduction
The cast iron roll is produced by a horizontal centrifugal casting process with high-speed steel as the work layer and nodular iron as the core. The material of centrifugal casting 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. In a condition of hot rolling, the contact points between steel strip and the work rolls can form a thin adherent oxide film on the roll surface, which plays a good role in the wear features and the quality of the strip surface.
Why Choose Centrifugal Composite Casting?
The Centrifugal Composite Casting (also known as Spin Casting) is a sophisticated manufacturing process where the roll’s shell and core are poured separately while the mold is rotating at high speeds. This creates a superior “Bi-metal” structure that single-pour rolls cannot match.
Perfect Metallurgical Bond: The centrifugal force ensures a seamless and high-strength metallurgical bond between the high-alloy work layer (shell) and the ductile iron core.
Optimized Performance: This process allows us to use expensive, ultra-hard alloys for the shell (for wear resistance) while using high-toughness materials for the core and necks (to prevent breakage).
Enhanced Material Density: The high-speed rotation eliminates internal defects such as porosity and slag inclusions, resulting in a much denser and more uniform microstructure in the working layer.
Cost-Efficiency: By concentrating the expensive alloys only where they are needed—on the working surface—we provide a high-performance solution at a more competitive price point.
Application
The main application is as a working roll for hot-rolled strip leveling rack and rack of high-speed wire mill.
SGA cast work 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
Our Centrifugal Composite Roll Varieties:
- ICDP Rolls: Best for finishing stands with anti-spalling requirements.
- High Cr Rolls: Ideal for hot strip and plate mills needing high wear resistance.
- Adamite Rolls: The versatile choice for roughing and intermediate stands.
Chemical Composition
Roll | C | Si | Mn | P | S | Ni | Cr | Mo | Mg |
Ni-Cr-Mo semi-chilled centrifugal composite cast iron 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 centrifugal composite cast iron 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 |
Acicular nodular composite cast iron roll | 2.90~3.60 | 1.00~2.20 | 0.50~1.00 | ≤0.10 | ≤0.03 | 2.00~3.00 | 0.10~0.60 | 0.40~1.00 | ＞0.04 |
Physical Properties
| Roll | Roll-body outer-layer hardness HSD | Roll-neck (spherical core) hardness HSD | Tensile strength |
| (spherical core) Mpa | |||
| Ni-Cr-Mo semi-chilled cast iron centrifugal composite roll | 70-85 | 35-48 | ＞300 |
| Ni-Cr-Mo infinite chilled nodular cast iron centrifugal composite roll | 65-85 | 35-48 | ＞300 |
| Ni-Cr-Mo nodular cast iron centrifugal composite roll（II） | 55-75 | 35-48 | ＞400 |
| Ni-Cr-Mo nodular cast iron centrifugal composite roll（III） | 60-80 | 35-48 | ＞400 |
| Cr-Mo chilled nodular composite cast iron roll | 58-70 | 35-48 | ＞300 |
| Ni-Cr-Mo chilled nodular composite cast iron roll | 60-72 | 35-48 | ＞300 |
| Ferrite nodular composite cast iron roll | 45-55 | 35-48 | ＞400 |
| Acicular nodular composite cast iron roll | 55-65 | 35-48 | ＞400 |
Metallographic Structure
| Roll | 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 |
| Acicular nodular composite cast iron roll | acicular + cementite + a little graphite |
Customization
Leave your RFQ and provide the drawings, chemical composition, hardness, physical properties, etc.