Product Description:

HiCr Steel                                 Products - Roll for hot strip and plate mill
    
HiCr Steel is characterized by excellent fire crack resistance and very good oxidation behaviour at rolling temperature. Very good wear resistance and constant material properties throughout the shell layer.

HiCr Steel is manufactured by horizontal spin casting. No retained Austenite and the right structure and properties are obtained through the chemical composition, high temperature quenching and tempering cycles.

Core material: Nodular Iron

Application:
Work Rolls for Roughing Stands of conventional HSM
Early Stands of CSP Mill
 

MATERIAL	CHEMISTRY							BARREL HARDNESS (HSC)   (HSD)
	C	Si	Mn	Cr	Ni	Mo	V
HiCr Steel	0.90-2.00	0.40-1.40	0.40-1.40	10.0-18.0	0.60-1.60	1.00-2.00	≤1.00	65-80

 

	TYPICAL PHYSICAL PROPERTIES
Neck Hardness (HSC)	Tensile Strength (N/mm2)	Unevenness of Barrel Surface Hardness (HSC)	Difference of Shell Thickness
35-45	shell ≥750 core & neck ≥400	<3	<10

 

EN-HiCr Iron                             Products - Roll for hot strip and plate mill

Enhanced High Chromium Iron is widely used in early finishing stands of hot strip mills.The microstructure consists of a tempered bainitic / martensitic matrix with Cr7C3 carbides and MC type carbides homogeneously distributed in the matrix.
 
Core material: Nodular Iron

Application:
Work Rolls for early finishing stands (F1-F4) of HSM and early stands of CSP Mill.
Work Rolls for Heavy Plate mills and Temper mills
 

MATERIAL	CHEMISTRY							BARREL HARDNESS   (HSC)
	C	Si	Mn	Cr	Ni	Mo	V
HiCr Iron	2.60-3.20	0.40-1.20	0.30-1.20	16.0-22.0	1.00-2.00	1.00-3.00	≤1.5	70 - 85

 

	TYPICAL PHYSICAL PROPERTIES
Neck Hardness (HSC)	Tensile Strength (N/mm2)	Unevenness of Barrel Surface Hardness (HSC)	Difference of Shell Thickness
35-45	shell ≥650 core & neck ≥400	<3	<10

Enhanced -ICDP                           Products - Roll for hot strip and plate mill

The enhanced ICDP is developed based on the classic Indefinite Chill Double Poured Cast Iron.The microstructure consists of a bainitic / martensistic matrix with Fe3C and MC carbides homogeneously distributed and a certain amount of free graphite fine and also well distributed in the matrix.The rolls are double tempered to avoid retained Austenite and to obtain the right hardness level and the optimum residual stress level.

Core material: Nodular Iron or Grey Iron depending on the mill or customer's requirements

Application:
Late finishing stands (F4 - F7) of hot strip mills
Steckel mills, Heavy Plate mills and finishing stand of section mills
 

MATERIAL	CHEMISTRY							BARREL HARDNESS   (HSC)
	C	Si	Mn	Cr	Ni	Mo	V+W+Ti+Nb
EN-ICDP	2.90-3.40	0.60-1.60	0.50-1.50	1.20- 2.00	3.50-5.00	0.20-1.00	≤2.5
								70-82

 

	TYPICAL PHYSICAL PROPERTIES
Neck Hardness (HSC)	Tensile Strength (N/mm2)	Unevenness of Barrel Surface Hardness (HSC)	Difference of Shell Thickness
35-45	≥400	<3	<10

HSS                                      Products - Roll for hot strip and plate mill

The microstructure consists of tempered bainitic / martensitic matrix with primary and secondary carbides.Primary carbides MC, M7C3, M6C and M2C are originated during the eutectic solidification. Secondary carbides are precipitated during the High Temperature quench and tempering. The rolls are cast with the right structure to undergo the High Temperature quenching to promote the right precipitation of secondary carbides and optimum material properties. Excellent wear resistance and fire crack resistance and very good oxidation behaviour at rolling temperatures under the adequate rolling conditions are the main features of this grade

Core material: Nodular Iron

Application:
Work Rolls for early finishing stands (F1-F4) of HSM and early stands of CSP Mill.
Work Rolls for finishing stands of bar mills.

MATERIAL	CHEMISTRY								BARREL HARDNESS   (HSC)
	C	Si	Mn	Cr	Ni	Mo	V	W
HSS	1.50-2.20	0.30-1.00	0.40-1.20	3.00- 8.00	0.50-1.50	2.00-8.00	2.00-9.00	0.00-8.00
									75-85

 

	TYPICAL PHYSICAL PROPERTIES
Neck Hardness (HSC)	Tensile Strength (N/mm2)	Unevenness of Barrel Surface Hardness (HSC)	Difference of Shell Thickness
30-45	shell ≥800 core & neck ≥400	<3	<10

CAST BACK-UP ROLLS                    Products - Roll for hot strip and plate mill

TSR Rolls 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)

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	55-65
	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 & neck ≥750	<3	<10

 

Detailed Photos

 

 

Technology

--MELTING

TSR Rolls factory is equipped with a variety of smelting equipments, such as EBT electric arc furnace, LF double-bit refining furnace, VD-VOD vacuum furnaces and etc. Advanced smelting equipment supplemented by temperature control, component analysis and other testing equipment ensure that each furnace is in line with the requirements of molten steel.

Steel Foundry

• EBT Arc Furnace; Capacity 55T
• Ladle Furnace, Double position; Capacity 55 T Each
• Vacuum Degassing VD + VOD, 9 units; Capacity 90 T Each
• Medium Frequency Induction Furnaces, 2 sets; Capacity 20 T Each

Large Rolls Foundry

• 2 x 20 T Medium Frequency Induction Furnaces
• 2 x 10 T Medium Frequency Induction Furnaces
• 2 x 7 T Medium Frequency Induction Furnaces
• 2 x 3 T Medium Frequency Induction Furnaces

Small Rolls Foundry

• 2 x 3 T Medium Frequency Induction Furnaces
• 2 x 1.5 T Medium Frequency Induction Furnaces
• 2 x 1 T Medium Frequency Induction Furnaces

    
--CASTING

TSR Rolls applies advanced roll casting technology to first-class foundry equipment. Our main production processes use computers to control and select parameters automatically. So we can ensure that each batch of rolls has consistent production process control. Every step is traceable by our Electronic recording system. Whether it is static casting or centrifugal casting, our products have excellent performance.

7 Horizontal Spin Casters (Centrifugal Machines)

• 1 Unit Ø 1.600 mm x 4.500 mm B.L.
• 1 Unit Ø 1.400 mm x 3.000 mm B.L.
• 2 Units Ø 800 mm x 2.600 mm B.L.
• 1 Unit Ø 500 mm
• 2 Units Ø 300 mm

Plus a complete set of chills, chillers and moulding tackle to cast all kind of rolls including big section rolls with the barrel shaped with grooves and collars in as-cast condition.

     
--HEAT TREATMENT

During the manufacturing process of rolls, many materials need to pass one or more heat treatment to further achieve the most appropriate mechanical properties and good microstructure. The resistance furnace of TS ROLL can achieve multi-point precise temperature control to ensure uniformity of the furnace temperature. Between different furnaces, we use a unified computer control to achieve the furnace heating and cooling consistency in order to ensure the rolls from different furnaces with same microstructure and performance.

• Differential Heat Treatment Furnace Ø 1.600 mm x 2.800 mm B.L.
• Spray quenching machine, Maximum capacity: Ø1800mm rolls
• Electrical fumaces, Maximum capacity: 200T 18 sets - bogie type
• 7  sets - low-temperature
• 11 sets - high temperature

--MACHINING

TSR Roll has a machining shop of more than 15.000 square meters, including the lathe, boring machine, grinding machine and other modern processing equipment for rolls. Thanks for the first-class operator working on high-precision CNC equipment, it is easy to produce the rolls with various kinds of grooves and precise tolerances.

• CK61160 CNC Lathe, Maximum capacity: 32T
• MK84200 CNC Grinding machine, Maximum capacity: 50T
• C9125*6/63 Turing and Boring machine, Maximum capacity: 63T
• T6920D Boring machine

    
--QUALITY ASSURANCE  

The high performance requirements of today's mills require reliable rolls capable of remaining in the production cycle longer than ever while still assuring a high quality of the rolled products. TS Rolls has built a consistent quality control throughout the manufacturing process. Our aim is supplying the customer with reliable rolls capable to perform better, contributing to customer benefit, cost reduction and satisfaction.

Since the beginning TS Roll obtained the ISO 9001:2008 Quality Management System Certification. Based on our consistent adherence to the quality management, TS Roll products quality has been universally acclaimed by dozens of customers worldwide.

• Emission Spectrometer ARL - 3460; Two sets
• Carbon & Sulphur Analyzer CS-80
• Hydrogen & Oxygen Analyzers
• Thermal Analyzer
• Hardness Testers (Portable and Laboratory sets)
• Ultrasonic Testing Equipments (Several units)
• Material Testing Machine WAW-600
• Charpy Impact Test Machine JSB-300

 

Service & Support

At TSR Roll, we are focused on the roll service. Our Technical Service will help you to solve questions about roll maintenance, roll wear, roll damages, roll configuration, shape of the roll, surface hardness, roughness, temperature distribution and damage inspection among others. The aim is reducing the Total Cost of Operation for the customer by supplying reliable rolls and advanced roll service always with strict adherence to the delivery time.

For more information about TSR, please visit our website: tsroll.en.made-in-china.com