Rolls introduction -sinom

INTRODUCTION
MACHINERY AND METALLURGICAL ROLLS
USED IN ROLLING MILL
SINOM GROUP CO., LTD.
ROLLS BRANCH FACTORY
2016 VERSION

SINOM@SINOMGROUP.COM
Machinery and Metallurgical Rolls
ABOUT US
Rolls branch factory is a specialized manufacturer of rollers established in 2002. It
has 320 employees, including 60 engineering and technical personnel and 260 production
workers.
The company has 86 sets of advanced casting and machining equipment dedicated
for rollers, including 5 medium-frequency induction furnaces of different tonnage between
1.5-5 tons, more than 20 heat treatment furnaces of different tonnage between 2 - 25 tons, 7
horizontal centrifugal casting machines of different specifications, and more than 60 sets of
special machine tools for rollers; high-precision rollers adopt CNC lathe processing.
The main processing equipment includes XK9416, XK7412, X2012D gantry millers,
MKC1380, MK84125, M84160, H163 grinders, CK5120B, CK6294, CKD61160, C5225E,
C8463B, CK5225M, C84180, CK61125 CNC lathes, CT6110A, CW6110D, CW61125B and
C61100 special lathes for rollers. For casthouse hot metal element analysis, the Switzerland
direct-reading spectrometer analysis is adopted; the hot metal is measured with
high-precision electronic scales; the hardness of products is measured with electronic Shore
hardness tester; product internal defects are detected by ultrasonic flaw detectors; for tissue
detection, metaloscope with digital cameras and computer-controlled image analyzers are
used, to realize stronger production and inspection capabilities. The main products are divided
into more than 20 varieties, including cast iron rollers, cast steel rollers, semi-steel rollers, high
speed steel rollers, with an annual output of more than 10,000 tons of centrifugal composite
rollers, common rollers and roll collars. The products are sold to iron and steel enterprises
across the country, and exported to South Korea, India, Malaysia, the United States and other
countries and regions, being highly praised by users.
The company obtained the roll production license in 2004, and obtained the
international mutually recognized ISO9001 Quality System Certification issued by the China
Metallurgical Industry Quality System Certification Center in 2003; the quality management
has been integrated with the international standards, and the company gained the “passport”
for selling products to the international markets; the company has passed the supervision and
reexaminations of the certification center for consecutive years. The quality management
system has maintained adequate, suitable and effective operation.
The company has a united and pragmatic leader team advocating democracy and

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science, and young audacious skilled workforce with fine style of work. In 2004, the company
introduced the A management model and management system, to make the management
faster and more efficient.
In the face of the momentum of global economic integration, and the severe
economic crisis situations, our company will seize the historic opportunities to meet
international challenges. Sticking to the principle of “having what others do not have, excel
others in what they have, and possessing core competitive edges where others hold a high
position”, and the “research a generation, develop a generation, and reserve a generation”,
adhering to the quality policy of treating customer sincerely, creating excellent quality,
upholding shared interests, pursuing innovation continually, strengthening quality control,
adjusting product structure, we provide users with high-quality products, thus turning the
company into one of the domestic SMEs based on centrifugal composite casting roll
production bases, further increase investment in science and technology, increase exports, so
that the company will transform towards the direction of brand oriented, high-tech, high
value-added, and export-oriented enterprise and embark on the road of revitalizing the
enterprise on the basis of science and technology, marching toward the goal of becoming
faster, higher and stronger.
FACTORY SITE

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EQUIPMENT FACILITEIS
 Casting Equipment
 Manufacturing Equipment

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 Testing Equipment

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PRODUCTS
 Casting Steel Rolls
 High Chromium Steel Rolls - HCrS
The hardness of HCrS rolls is as high as
65-80 HSC. Its matrix gives itself excellent
wear resistance and good fire-crack
resistance.
HCrS rolls have a low carbon content range
of about 10%. An important characteristic of
HCrS is that the mill is not required to adjust
special water cooling conditions. And in the rolling process these rolls can form oxide film to
improve surface quality of rolled products.
These rolls are suitable for both two-Hi roughing and early stand of four-Hi finishing for hot
strip mills.
Chemical Composition %
Symbol C Si Mn Cr Ni Mo
HCrS 1.00-1.80 0.40-1.00 0.50-1.00 8.00-15.00 0.50-1.50 1.50-4.50
Properties and Application %
Symbol Hardiness HS Tensile Strength MPa Application
HCrS 70-85 ≥450 (core)
Roughing work rolls for hot strip mills, vertical
rolls, universal section mills

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 High Speed Steel Rolls – HSS
HSS rolls have high hardness and good wear
resistance at high temperature. These rolls
are manufactured by Centrifugal Casting (CC)
method and the roll core is filled with
spheroidal graphite cast iron. The adequate
chemical composition control and proper heat
treatment ensures the hardness of roll
working layer to reach as high as 80-85HSC.
Uniformly distributed complex carbides of Vanadium. Tungsten, Niobium and Molybdenum in
the martensitic matrix ensures uniform hardness of working layer and uniform wear out in the
roll passes. These types of rolls are used for finishing stands to increase productivity and
improve surface quality of rolled piece.
Symbol C Si Mn W V Cr Ni Mo Nb
HSS 1.50-2.20 0.30-1.0 0.40-1.20 0.00-8.00 2.00-9.00 3.00-8.00 0.00-1.50 2.00-8.00 0.00-2.00
S-HSS 0.60-1.20 0.80-1.50 0.50-1.00 0.00-3.00 0.40-3.00 3.00-9.00 0.20-1.20 2.00-5.00 0.00-2.00
Symbol Barrel Hardness HS Neck Hardness Application
HSS 75-95 30-45
Finishing work rolls for hot strip mills and bar mills;
universal section mills; pre-finishing rolls for high speed
wire mills
S-HSS 75-98 30-45
Roughing work rolls for hot strip mills; work rolls and
intermediate rolls for cold strip mills.

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 Alloy Indefinite Chilled Cast Iron Rolls - AIC
Alloy Indefinite Chilled Cast Iron Rolls is a
cast iron with fine intercrystalline graphite
evenly distributed throughout the working
layer of roll barrel. The sizes shapes and
distributions of graphite and carbide are
controlled by the chilling effect and the
contents of alloy elements. The addition of
alloy elements such as Manganese, Nickel,
Chromium, and Molybdenum changes the
matrix microstructure from pearlite, bainite to martensite. The present of small amount of fine
graphite enhances the roll’s resistance to spalling, thermal crack and wearability. This roll has
small hardness gradient in the working layer of roll barrel and is suitable to medium and
finishing stands for bar, wire and section mills.
Symbol C Si Mn Cr Ni Mo v
IC 2.90-3.60 0.60-1.20 0.40-1.20 0.60-1.20 0.20-0.60
IC I 2.90-3.60 0.60-1.20 0.40-1.20 0.70-1.20 0.50-1.00 0.20-0.60
IC II 2.90-3.60 0.60-1.20 0.40-1.20 0.70-1.20 1.01-2.00 0.20-0.60
IC III 2.90-3.60 0.60-1.20 0.40-1.20 0.70-1.20 2.01-3.00 0.20-1.00
IC IV 2.90-3.60 0.60-1.50 0.40-1.20 1.00-2.00 3.01-4.80 0.20-1.00
IC V 2.90-3.60 0.60-1.50 0.40-1.20 1.00-2.00 3.01-4.80 0.20-2.00 0.20-2.00
IC 50-70 ≥160
Rolls for intermediate and finish stands of section mills, bar
and rod mills, hot strip mills.
IC I 55-72 ≥160
IC II 55-72 ≥160
IC III 65-78 ≥350
IC IV 70-83 ≥350
Medium & heavy plate mills, hot strip mills, work rolls, skin
pass rolls.
IC V 77-85 ≥350

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 Clear Chilled Rolls - CC
Alloy chilled cast iron rolls are one kind of cast
iron rolls, which contain almost no free
graphite in the matrix of working layer of the
barrel. They have high hardness and
excellent wearability, and are suitable to finish
stands of light bar and wire rolling mills and
narrow strip mills. Its microstructure is fine pearlite and carbides.
CC I 2.90-3.60 0.25-0.80 0.20-1.00 0.20-0.60 0.50-1.00 0.20-0.60
CC II 2.90-3.60 0.25-0.80 0.20-1.00 0.30-1.20 1.01-2.00 0.20-0.60
CC III 2.90-3.60 0.25-0.80 0.20-1.00 0.50-1.50 2.01-3.00 0.20-0.60
CC IV 2.90-3.60 0.25-0.80 0.20-1.00 0.50-1.70 3.01-4.50 0.20-0.60
Symbol Hardness HS Tensile Strength MPa Bending Strength MPa Application
CC I 60-70 ≥150 300-400
Rolls for finish stands of small
section mills, bar and wire mills,
hot narrow strip mills, temper
mill work rolls.
CC II 62-75 ≥150 300-400
CC III 65-80 ≥350 500-700
CC IV 70-85 ≥350 500-700

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 Alloy Nodular Cast Iron Rolls - SG
These rolls are characterized by spherical
graphite. Its mechanical properties are similar
to that of alloy indefinite chilled rolls except
that its strength is higher than the latter. They
can be produced by static.
Symbol C Si Mn Cr Ni Mo Mg
SG II 2.90-3.60 0.80-2.50 0.40-1.20 0.20-0.60 - 0.20-0.60 ≥0.04
SG IV 2.90-3.60 0.80-2.50 0.40-1.20 0.20-0.60 0.50-1.00 0.20-0.80 ≥0.04
SG V 2.90-3.60 0.80-2.50 0.40-1.20 0.30-1.20 1.01-2.00 0.20-0.80 ≥0.04
SG II 50-70 ≥320 500-700
Rolls for finish stands of small
hot narrow strip mills, temper
mill work rolls.
SG IV 55-70 ≥320 500-700
SG V 60-70 ≥320 600-800

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 Spheroidal Graphite Pearlite Rolls - SGP
Pearlitic nodular rolls are obtained by adding
alloy elements of NiCrMo into the nodular
cast iron and following special heat treatment.
Pearlitic nodular rolls have high strength,
good thermal properties and resistance to
emergencies as well as small hardness
gradient of working layer.
Symbol C Si Mn Cr Ni Mo Mg
SGP I 2.90-3.60 1.40-2.20 0.40-1.00 0.10-0.60 1.50-2.00 0.20-0.80 ≥0.04
SGP II 2.90-3.60 1.20-2.00 0.40-1.00 0.20-1.00 2.01-2.50 0.20-0.80 ≥0.04
SGP III 2.90-3.60 1.00-2.00 0.40-1.00 0.20-1.20 2.51-3.00 0.20-0.80 ≥0.04
SGP I 45-55 ≥450
Rolls for blooming mills, Rolls for roughing and intermediate
stands of bar, rod and section mills.
SGP II 55-65 ≥450
SGP III 62-72 ≥450

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 Spin Cast High Chromium Iron Rolls - HCr
This type of roll is manufactured from high
alloy materials, whose microstructure is
bainite and chrome carbides and core is filled
with spheroidal graphite cast iron.
Symbol C Si Mn Cr Ni Mo V
HCr I 2.30-3.30 0.30-1.00 0.50-1.20 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 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 18.01-22.00 0.70-1.70 1.51-3.00 0.00-0.60
HCr I 60-75 ≥350
Vertical rolls and skin pass rolls for hot strip mills, work rolls
for medium & heavy plate mills, roll sleeves for universal
mills, work rolls for cold rolled tin plate mills.
HCr II 65-80 ≥350
HCr III 75-90 ≥350
 Cast Rolls For Cold Rolling Mills - HCrCold
Cast rolls for cold rolling mill are obtained by
adding some special alloy elements based on
HCr II and HCr III and following heat
treatments many times. The hardness can
reach as high as 78-82 HSC. The rated
tonnage rolled is one time higher than that of
cold forge steel rolls.
HCrCold 2.50-3.50 1.25-2.50 0.50-1.50 14.00-23.00 0.50-2.00 1.00-3.00
HCrCold 75-90 ≥380 Work rolls for cold rolled tin plate mills.

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 Non Continuous Carbides Rolls - NCC
Rolls for roughers require a combination of
some properties, some of which can be
counteracted by the others. These properties
include wearability, resistance of fire cracking
and impact, hot hardness and hot strength etc.
Excessive network carbides will improve
wearability and impact resistance but
dramatically reduce fracture toughness. Under rough rolling process they can promote fire
cracking formation and added to form Bainitic / Martensitic (acicular) matrix, which is more
wearable than conventional pearlitic matrix. The Molybdenum can also improve the hot
hardness of rolls.
This type of roll is manufactured from high alloy materials with special heat treatment. Carbide
content is the matrix is less than 5%, which is satisfactory to the requirement of roughers.
NCC I 3.00-3.40 2.00-2.50 0.80-1.00 ≥0.15 2.00-3.00 0.40-0.70
NCC II 3.00-3.40 1.50-2.00 0.80-1.00 ≥0.15 2.50-4.50 0.50-1.00
NCC I 40-50 ≥520 970-1380 Roughing stands of bar and wire
mills, BD2 rolls for large section
mills.NCC II 50-60 ≥520 970-1380

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 Arbor With Sleeve For Roughing and Finishing Stands of Universal Mills
We produce various qualities for sleeves arbors, such as SG
Pearlitic, SG Acicular, Steel Base. GT Adamite, and K-Metal.
Chemical Composition of Sleeve %
Symbol C Si Mn Cr Ni Mo Cu
SGP Sleeve 2.90-3.60 1.00-2.20 0.40-1.00 0.20-1.20 1.50-3.00 0.20-0.80
SGA Sleeve 2.90-3.60 1.00-2.20 0.20-0.80 0.20-1.50 3.01-4.50 0.50-1.00
Adamite
Sleeve
1.50-2.10 0.30-0.80 0.60-1.30 0.80-3.50 0.50-2.50 0.20-0.80
GT Sleeve 1.40-1.60 0.30-0.80 0.70-1.50 1.00-2.00 1.00-3.00 0.40-0.80
K-metal
Sleeve
2.50-3.00 0.50-0.70 0.80-1.20 10.00-15.00 ≥0.20 0.50-0.80 1.00-1.50
Properties and Application of Sleeve %
Symbol SGP Sleeve SGA Sleeve Adamite Sleeve GT Sleeve K-metal Sleeve
Tensile strength
MPa
≥450 ≥350 ≥490 ≥690 ≥700
Chemical Composition of Arbor %
Symbol C Si Mn Cr Ni
42CrMo 0.38-0.45 0.17-0.37 0.50-0.80 0.90-1.20 0.15-0.30
Properties and Application of Arbor %
Symbol Tensile Strength MPa Application
42CrMo ≥800 Vertical universal stands, arbor assembled with sleeves for finishing stands.
 Casting Rolls With Grooves
These rolls have an advantage of small
hardness difference between upper surface
and lower surface of the roll pass and can be
used for stands of medium and large section
mills as well as large bar mills. They have
advantages of long service life and good
surface quality of rolled pieces. They are
highly welcomed by customers. SGP
(spheroidal graphite pearlite) can be used for
medium section mills, and AIC (alloy
indefinite chilled) can be used for small section mills.

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 Bainitic Nodular Cast Iron Rolls - SGA
Alloy elements of Ni, Mn, Cr, Mo etc. are
added to bainitic nodular cast iron rolls for
obtaining acicular (bainite-martenite) matrix in
its microstructure of these rolls. Its strength
and toughness is higher than Pearlitic
Nodular Cast Iron Rolls, wearability is also
better than latter. These rolls can be produced
by static casting or centrifugal casting.
SGA I 2.90-3.60 1.20-2.20 0.20-0.80 0.20-1.00 3.010-3.50 0.50-1.00
SGA II 2.90-3.60 1.00-2.00 0.20-0.80 0.30-1.50 3.51-4.50 0.50-1.00
SGA I 55-78 ≥350 600-800
Finish stands of small section
mills, hot narrow strip mills,
intermediate stands of bar and
rod mills, pre-finish stands of
wore mills.
SGA II 60-80 ≥350 600-800

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 Hot Working Die Steel Rolls – HWD
Hot Working Die Steel Rolls are formed in the
high temperature state and have high thermal
strength, high thermal stability, excellent
wearability and resistance to thermal fatigue
and temper stability. This type of rolls is used
for blooming of large section mills to have a
much longer service life.
Symbol C Si Mn Cr Ni Mo V
HWD I 0.50-0.60 0.10-0.40 0.50-0.80 0.50-0.80 1.40-1.80 0.10-0.30
HWD II 0.40-0.50 0.40-0.70 0.40-0.60 1.50-2.00 0.80-1.20 0.80-1.20 0 30-0.50
HWD III 1.40-1.60 0.20-0.40 0.40-0.60 10.00-14.00 0.70-0.90 0.80-1.00
HWD I 40-50 ≥1000
Blooming and Roughing stands of large section mills.
HWD II 50-60 ≥1100
HWD III 55-65 ≥500 (core) Vertical rolls for universal mills, egder rolls.

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 Alloy Steel Rolls - AS
Alloy cast steel rolls are made of high quality
steel melted with variable frequency furnace
and finished with advanced foundry and heat
treatment technologies. Our rolls have
mechanical properties of high tensile strength,
excellent resistance to fire crack, high
wearability and toughness. These rolls are
mainly composed of pearlite (or temper sorbate) in the microstructure.
AS60 0.55-0.65 0.20-0.45 0.90-1.20 0.80-1.20 0.20-0.45
AS65 I 0.60-0.70 0.20-0.60 0.50-0.80 0.80-1.20 0.20-0.50 0.20-0.45
AS70 I 0.66-0.75 0.20-0.45 1.40-1.80
AS70 II 0.65-0.75 0.20-0.45 1.40-1.80 0.20-0.45
AS75 0.70-0.80 0.20-0.45 0.60-0.90 0.75-1.00 0.20-0.45
AS75 I 0.70-0.80 0.20-0.70 0.70-1.10 0.80-1.50 ≥0.20 0.20-0.60
AS60 35-50 ≥650
Blooming and slabbing mills, roughing stands of
large section mills. Rough stands of bar and wire
mills, breakdown rolls for rail and section universal
mills.
AS65 I 35-45 ≥650
AS70 I 35-45 ≥600
AS70 II 35-45 ≥680
AS75 35-50 ≥680
AS75 I 35-50 ≥700

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 Adamite Rolls - AD
Adamite is a material, mechanical properties
and carbon content of which stands between
steel and iron. Owing to its alloy elements
such as Ni, Cr, Mo etc. there are some
amount of carbide in the matrix and because
of certain special heat treatment technology,
high wearability, good toughness and
excellent resistance to fire crack are obtained. The most advantages of these rolls are almost
no hardness gradient in the working layer. These rolls are used in roughers and front stands of
the finisher for hot strip mills; rougher, intermediate stands and pre-finishing stands for bar and
wire; roll rings and roll sleeves for universal ills and cantilever mills.
AD140 I 1.30-1.50 0.30-0.60 0.70-1.10 0.80-1.20 0.50-1.20 0.20-0.60
AD160 I 1.50-1.70 0.30-0.60 0.80-1.30 0.80-2.00 ≥0.20 0.20-0.60
AD180-AD200 1.70-2.10 0.30-0.80 0.60-1.20 0.80-3.50 0.50-2.50 0.20-0.80
ADGT 1.40-1.60 0.30-0.80 0.70-1.50 1.00-2.00 1.00-3.00 0.40-0.80
Symbol Hardness HS Tensile Strength MPa Elongation % Application
AD140 I 35-50 500-800 ≥1.00
Blooming and slabbing mills, roughing
stands of large section mills
AD160 I 40-60 500-800 ≥1.00 Roughing stands of small and medium
narrow strip mills, vertical rollsAD180-AD200 45-65 450-700 ≥0.50
ADGT 55-65 690-850 ≥0.50
Blooming and slabbing mills, rough
stands, back up rolls for hot narrow
strip mills, intermediate and finishing
stands of large section mills.

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 Graphite Steel Rolls - GS
The characteristics of graphite steel rolls are
similar to that of adamite rolls, the main
character is that it contains a small amount of
fine graphite in its microstructure, which will
increase its resistance to fire crack and
prevent oxidized scales from adhering. They
are suitable for blooming and roughing
stands.
GS140 1.30-1.50 1.30-1.60 0.50-1.00 0.40-1.00 0.20-0.50
GS160 1.50-1.70 0.80-1.50 0.60-1.00 0.50-1.50 0.20-1.00 0.20-0.80
GS190 1.80-2.00 0.80-1.50 0.60-1.00 0.50-2.00 0.60-2.20 0.20-0.80
Symbol Hardness HS Tensile Strength MPa Elongation % Application
GS140 36-46 ≥540 ≥1.00
Roughing stands of small and
medium section mills, bar and
wire mills and hot strip mills, roll
sleeves for universal mills.
GS160 45-55 ≥500 ≥1.00
GS190 50-65 ≥450 ≥0.40

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 Forged Steel Rolls
 Cold Rolling Mill Work Roll
 Anti-rolling Mark Roll
In rolling sheets for automobiles and
household electrical appliances, the dent
imperfection brought by the foreign
objects on the roll's surface will most
probably be passed on to the strip surface
to cause color difference and pit in the
rolled product. Due to the demanding
surface soundness of those products,
these kinds of flaws will definitely bring a
negative effect on the strip quality.
Sinom Roll has upgraded their rolls' anti-press-in and anti-scratches capabilities by
adjusting the rolls' alloy composition and heat treatment techniques. The barrel's
hardness can reach over HRC64. Granted as National Patent, this tech can satisfy
the requirement of high-performance cold rolled products such as sheets for
automobile and high-class household electrical appliances.
Material Feature Application
CBRWR-AMR Anti-press-in, anti-scratches
To roll sheets for automobile, high-class household
electrical appliances
 High-abrasion-resistance Roll
With the development of current rolling
skill, increases are being achieved
continuously in the products' level and
output. In rolling some steel sheets with
higher strength, phenomenon as
"slippery" will often occur resulting from
excessively fast decreasing of toughness.
As a result, the quality of sheet will
degrade while roll change frequency will
increase. It not only affects the output but also raises the roll's consumption.
By scientific alignment to the chemical composition and rational production
techniques, Sinom Roll optimizes the carbide type and distribution and develops a
series of anti-abrasion rolls.
This product has applied for national patent.
CBRWR-HR Anti-abrasion, anti-slippery To roll steel sheet of high strength

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 Anti-hydrogen Corrosion Roll
In the process of skin-passing hot-dipped
galvanized Al-Zn sheet, aluminium / zinc
reacts with cooling water to generate
hydrogen which will stay to the roll surface.
As a result, the crack from hydrogen
brittleness will take shape to add to the
grinding even lead to the spalling.
By adjusting the roll composition,
Changzhou roll adopts special heat treatment to control the grain size of the
hardened layer, the remnant austenite and the hardness of roll in improving the basic
characteristics, thus to upheave its anti-hydrogen-brittleness feature.
CBRWR-AR Anti-hydrogen-brittleness Skin-pass mill for hot-dipped galvanized Al-Zn
 Anti-accident Roll for Silicon Steel
In order to fit the special requirement of
the silicon steel customers, Sinom Roll
launched the design and development in
roll’s new material and technique so that
the Anti-accident roll for silicon steel can
basically meet the demand of the end
customers.
Reliability: *good toughness against impact; *low residual stress; *High feature of
anti-spalling
Feature on surface: *Improvement in roughness maintaining ability
Cost: *Unit value is relatively high.
Feature of anti-accident roll: *High hardness carbide; *high wear-resistance;

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 Cold Rolling Mill Intermediate Roll
 Cold Rolling Mill Intermediate Roll
Cold rolling mill intermediate Roll applies
to high precision 6-Hi (as well as a few
8-Hi) mill, named from working location
between work roll and back-up roll, mainly
used to control the shape of strip. Material specification of 2%Cr, 3%Cr, 5%Cr,
Semi-High Speed Steel are available.
Name Type of material Hardness Depth of hardness Hardness deviation
Intermediate roll 2%Cr, 3%Cr, 5%Cr SHSS 70-85 HSD 8-50mm Within 2 HSD
 Back-up Roll
 Big-sized Back-up Roll
Forged steel back-up roll is mainly used in
4-Hi mill and 6-Hi mill. The diameter of roll
barrel is 350~1400mm. The material of
back-up roll includes 60CrMo, 9Cr2Mo,
86CrMoV7, 70Cr3Mo etc.
The main types of mills: back-up roll of
650mm Mill, 900mm Mill, 1050mm Mill,
1250mm Mill, 1450mm Mill.
We cooperate closely with lots of mill design companies for the supply of 650mm Mill,
900mm Mill, 1050mm Mill, 1250mm Mill, 1450mm Mill. such as Xi’an Kairui, CISDI,
WISDRI, XHMRI etc.
Name Type of material Hardness Hardness deviation
Back-up roll 60CrMo, 9Cr2Mo, 86CrMoV7, 70Cr3Mo 60-80 HSD 2-3 HSD

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 Sendzimir and Cluster Mill Roll
 Sendzimir Work Roll & Sendzimir Intermediate Roll
Sendzimir mill is favored by high technology
customers because of high rolling precision, such
as very thin strip and difficult deformation silicon
steel, stainless steel.
The material of Sendzimir work roll is tool steel, die
steel and high-speed steel. These are materials of
high hardness. The rolls are manufactured under
quenching and tempering processes of high
temperature. During the tempering process, secondary hardening is used to reach
hardness of 60-63HRC, 61-64 HRC, 63-66HRC etc, for different work rolls.
High hardness tool steel and die steel are used as raw materials for Sendzimir
intermediate roll. The rolls are also manufactured under quenching and tempering
process of high temperature. During tempering process, secondary hardening is
used to reach hardness of 55-60HRC for different intermediate rolls.
Name Type of material Hardness
Sendzimir work roll tool steel, die steel and high-speed steel 60-66 HRC
Sendzimir intermediate roll tool steel, die steel and high-speed steel 55-60 HRC

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 Retained Mandrel Bar
 Retained Mandrel Bar
The retained mandrel for the production of large-sized seamless steel pipe is used in
sectional structure. Its working section is exposed to complex and huge surface
pressure as well as thermal cold-hot fatigue, whereas its connection part has to
withstand mechanical forces during the pressing process.
The working part of the retained mandrel produced by CBR adopts H13 hot-work die
steel. The many production processes, that include smelting, forging, rough
machining, heat treatment, semi-finished & finished machining, chrome plating and
phosphate treatment, ensures the following characteristics: CBR is upgrading the
mandrel material and its manufacturing technology in close collaboration with China
Research Institute.
THE END

Rolls introduction -sinom

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