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Product Description
The high-Cr cast iron rolls are made by centrifugal casting process, the work layer contains 12-22% Chromium. Through rational chemical composition allocations and different heat treatments, the matrix can be controlled as sorbite, troostite, bainite or martensite and certain kinds of carbides, such as Cr7C3 eutectic carbides, Cr23C6 second carbides, Mo2C carbides etc. According to different purposes of use, the material of the core could be nodular iron or grey iron.
We make this type of roll by centrifugal cast double poured. In this case, we can achieve an excellent wear resistance in the shell with flake graphite, bainite & martensite and primary carbide type M7C3 + secondary carbide in the microstructure.
Besides the excellent wear resistance, it is aldo good against fire cracking thanks to the oxide film Cr2O3 formed on the body surface while rolling. At the same time, the core is strong enough to assure the roll can work safely.
The Hi Cr rolls are mainly used as work rolls in the roughing & previous -finishing stands of hot strip continuous rolling mills; work rolls in the roughing & finishing stands of the plate mills; work rolls in temper mills and cold strip mills; rings in the large universal mill; work rolls in the finishing stands of small section mills and bar mills.
Chemical Composition
|
|
Grade |
C |
Si |
Mn |
P |
S |
Cr |
Ni |
Mo |
Mg |
|
Ccentrifugal |
HCr I |
2.30-3.30 |
0.30-1.00 |
0.50-1.20 |
≤0.10 |
≤0.05 |
12.00-15.00 |
0.70-1.70 |
0.70-1.50 |
0.00-0.60 |
|
HCr II |
2.30-3.30 |
0.30-1.00 |
0.50-1.20 |
≤0.10 |
≤0.05 |
15.01-18.00 |
0.70-1.70 |
0.70-1.50 |
0.00-0.60 |
|
|
HCr III |
2.30-3.30 |
0.30-1.00 |
0.50-1.20 |
≤0.10 |
≤0.05 |
18.01-22.00 |
0.70-1.70 |
1.51-3.00 |
0.00-0.60 |
|
|
CORE |
2.90-3.70 |
1.20-2.60 |
0.50-1.00 |
≤0.10 |
≤0.05 |
≤0.08 |
≤0.15 |
≤0.50 |
≥0.04 |
Mechanical Properties
|
Tensile Strength (kg/mm²） |
400-700 |
|
Bending Strength (kg/mm²） |
650-1000 |
|
Elongation (%) |
0.2-0.6 |
Metallography Organism
Company Information
Our company’s products cover all varieties of rolls for steel production, which mainly in the following varieties: iron roll class mainly CrMo indefinite chill roll ductile iron, ductile iron low NiCrMo indefinite chill roll, in NiCrMo indefinite chill ductile iron roll, pearlite nodular cast iron roll, bainite ductile iron roll, improved bainite roll, NiCrMo indefinite chill cast iron rolls, and other cast steel rolls.
Quality Control
From the incoming of raw material to outgoing of final products, every manufacturing step in our company are in conformity with the stipulation of quality control system.
Regular inspection carried out by the external censorship proved that quality control system of QINPENG roll company has reached the requirements of ISO9001.
Package & Shipping
Our Advantage
Our company goes to the future with reputation of:
Good economic benefits;
Stable rolled strip profile;
Good surface quality;
High dimension accuracy;
Expert technical advise
Good wear resistance
Prolong service period
High safety factor.
