CAST BACKUP ROLLS FOR HOT STRIP MILLS
Cast Back Up Rolls are produced to a high hardness level of up to 75 HSC through a Differential Hardening process. The superior wear and mechanical hardening resistance are related to the bainitic / martensitic matrix and complex carbides finely distributed. In the Differential Hardening process the monoblock rolls are first heat treated to produce a fine pearlite necks and core structure followed by the differential hardening of the working layer (Austenitize, water quench and double tempering) to develop the optimum microstructure in the working layer.
The rolls are monoblock cast so no shell / core interface problems.
Application
- Back Up Rolls for 4-Hi Stands of Hot and Cold Strip mills and CSP Mills.
- Work Rolls for 2-Hi roughing Stands of Hot Strip Mills (3% Cr).
Materal Grades
|
MATERIAL |
GRADE |
CHEMISTRY |
BARREL HARDNESS (HSC) |
|||||
|
C |
Si |
Mn |
Cr |
Ni |
Mo |
|||
|
Cast Back-up Roll |
3%Cr |
0.30-0.50 |
0.30-0.60 |
0.40-1.0 |
2.50-3.50 |
0.60-1.50 |
0.30-0.60 |
55-62 |
|
4%Cr |
0.30-0.50 |
0.30-0.60 |
0.40-1.0 |
3.50-4.50 |
0.60-1.50 |
0.30-0.60 |
60-65 |
|
|
5%Cr |
0.30-0.50 |
0.30-0.60 |
0.40-1.0 |
4.50-5.50 |
0.60-1.50 |
0.50-0.80 |
65-75 |
|
TYPICAL PHYSICAL PROPERTIES
|
Neck Hardness (HSC) |
Tensile Strength (N/mm2) |
Unevenness of Barrel Surface Hardness (HSC) |
Difference of Shell Thickness |
|
≤42 |
shell ≥1500 core & necks ≥750 |
＜3 |
＜10 |
HARDNESS
DISTRIBUTION
MACHINING PROGRESS OF CAST BACKUP ROLLS
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Features
of cast backup rolls
- Superior Cost Efficiency
Cast backup rolls feature shorter manufacturing cycles and higher material utilization, resulting in significantly lower overall cost compared with forged backup rolls. They are especially suitable for long-term operation in large-scale rolling lines.
- Reliable Wear Resistance
Through optimized alloy design (such as high-chromium and alloy cast steel systems), the roll surface achieves enhanced wear resistance, ensuring extended service life under stable rolling conditions.
- High Structural Flexibility for Large Sizes
The casting process allows easy fabrication of large-diameter and ultra-wide backup rolls, with tailored internal composition and microstructure distribution to meet heavy-duty hot rolling mill requirements.
Improved Vibration Damping Performance
Compared with forged steel, cast materials exhibit better vibration absorption characteristics, helping reduce rolling chatter and improve strip shape stability.
Packing Details
Seaworthy crates, wooden boxes or steel pallets
Production time
4-6months
Shipping
Sea freight, Land freight and Air freight
Warranty Time
Whole lifetime warrantee
Production Progress
A specialized production control system is applied throughout roll manufacturing, covering material preparation, casting/forging, heat treatment, machining, and inspection. Strict control of key processes ensures stable roll performance, consistent quality, and reliable delivery.
TSR is a professional supplier of mill rolls and related technical services. Backed by an expert team of PhDs specializing in materials science and metallurgy, TSR is committed to becoming a world-class provider of roll technology and services.
With over 20 years of dedicated experience, TSR has been supplying high-quality mill rolls and reliable technical support to steel producers worldwide. Our products are successfully applied on more than 100 rolling mill lines across 30+ countries and regions, including France, Spain, South Korea, Vietnam, India, Brazil, and Mexico.
PRODUCTION CAPACITY
At TSR, we believe that continuous improvement leads to perfection. We consistently upgrade our advanced CNC equipment to ensure excellence throughout the production process.
MELTING
EBT Arc furnace: 55T
LF Refining furnace: 55T
VD+VOD: 55T
IM frequency furnace (8 sets): 20T
CASTING
Horizontal Spin Casters
Ø 1,600 mm x 4,500 mm B.L.
Ø 1,400 mm x 3,000 mm B.L.
Ø 800 mm x 2,600 mm B.L.
HEAT TREATMENT
Electrical furnaces
18 sets – bogie type
7 sets – low-temperature
11 sets – high temperature
Differential Heat Treatment
Furnaceφ1600 mm x 2800 mm B.L.
Spray quenching machine
Max φ1800mm
MACHING
CNC Lathe: 32T
CNC Grinding machine50T
Turing and Boring machine: 63T
Boring machine
QUALITY CONTROL
The high-performance demands of today’s mills require reliable rolls that can remain in the production cycle longer than ever, while ensuring high-quality rolled products. TSR has built a consistent quality control system throughout the entire manufacturing process. Our aim is to supply customers with reliable rolls that deliver better performance, contributing to customer benefit, cost reduction and satisfaction.
Dimentional
Inspection
Microstructure
Inspection
Ultrasonic
Inspection
Lismar
Environmental friendly package
Low-carbon operation of each equipment, recycling of every piece of metal, and environmental optimization of each process — these are TSR’s solemn commitments to the Earth. Even the smallest details of our packaging reflect TSR’s responsible attitude toward environmental protection.
- Seaworthy steel pallets
- 100% recyclable materials
- Unpainted steel pallets
- Optimized packaging design to minimize material consumption
Service and Support
Trust and Worth
Our Clients
