Edging Mill Roll
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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 casting.
Speaking of static casting, there’re two type of static process
No.1, Monobloc Static Cast Roll
Definition:
-Single pour casting rolls employ the same chemical content, i.e. Barrel and Neck.
-To achieve the different requirement of hardness, strength, and metallurgy by the means of controlling the freezing rate of molten iron
Material Application:
Material:Stands:Hardness:
SGPRoughing45 – 50 Shore
SGPIntermediate50 – 65 Shore
ACS/Steel/Base steelRoughing35 – 45 Shore
Base steel/Graphite steelIntermediate/Finishing50 – 55 Shore
SGAIntermediate/Finishing63 – 68 Shore
SGA/Mo (Heat Treatment)Intermediate/Finishing70 Max Shore
NCC (Heat Treatment)Roughing45 – 55 Shore
AICFinishing63 – 68 Shore
Hi CrIntermediate/Finishing55 - 65 Shore
Pros and Cons:
Pros:Cons:
Low costMax hardness is limited
Easy productionStrength of neck is limited
Material already existsHardness drop is large
Common material
Easy machining
Large diameter
No.2, Composite Static Cast Roll
Step 1, molten iron pours into outer shell
Step 2, after solidification of outer shell molten iron; add molten iron to the core, the overflow molten iron can be reclaimed.
Definition:
-The chemical content of barrel work layer is different from core and neck
-The properties of this type of rolls depends on chemical content, the cooling rate of both are also critical
Pros and Cons:
Pros:Cons:
Common material applicableHigher cost
Max hardness is higherCore material selection limited
Hardness drop is smallerNeck strength is limited
Chemical Composition %
SymbolCSiMnCrNiMoMg
SGⅡ2.90-3.600.80-2.500.40-1.200.20-0.60-0.20-0.60≥0.04
SGⅣ2.90-3.600.80-2.500.40-1.200.20-0.600.50-1.000.20-0.80≥0.04
SGⅤ2.90-3.600.80-2.500.40-1.200.30-1.201.01-2.000.20-0.80≥0.04
Prosperities&Application
SymbolHardness
HSTensile Strength
MPaBending
Strength
MPaDimension
MMUnit N.W
KGSApplication
SGⅡ50-70≥320500-700300-1300500-35000Rolls for finish stands of light section mills, bar and wire rod mills, hot narrow strip mills and temper mill.
SGⅣ55-70≥320500-700
SGⅤ60-70≥320600-800Edging Mill Roll
website:http://www.kdroll.com/cast-iron-and-steel-rolls/section-and-rail-mill-rolls/
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 casting.
Speaking of static casting, there’re two type of static process
No.1, Monobloc Static Cast Roll
Definition:
-Single pour casting rolls employ the same chemical content, i.e. Barrel and Neck.
-To achieve the different requirement of hardness, strength, and metallurgy by the means of controlling the freezing rate of molten iron
Material Application:
Material:Stands:Hardness:
SGPRoughing45 – 50 Shore
SGPIntermediate50 – 65 Shore
ACS/Steel/Base steelRoughing35 – 45 Shore
Base steel/Graphite steelIntermediate/Finishing50 – 55 Shore
SGAIntermediate/Finishing63 – 68 Shore
SGA/Mo (Heat Treatment)Intermediate/Finishing70 Max Shore
NCC (Heat Treatment)Roughing45 – 55 Shore
AICFinishing63 – 68 Shore
Hi CrIntermediate/Finishing55 - 65 Shore
Pros and Cons:
Pros:Cons:
Low costMax hardness is limited
Easy productionStrength of neck is limited
Material already existsHardness drop is large
Common material
Easy machining
Large diameter
No.2, Composite Static Cast Roll
Step 1, molten iron pours into outer shell
Step 2, after solidification of outer shell molten iron; add molten iron to the core, the overflow molten iron can be reclaimed.
Definition:
-The chemical content of barrel work layer is different from core and neck
-The properties of this type of rolls depends on chemical content, the cooling rate of both are also critical
Pros and Cons:
Pros:Cons:
Common material applicableHigher cost
Max hardness is higherCore material selection limited
Hardness drop is smallerNeck strength is limited
Chemical Composition %
SymbolCSiMnCrNiMoMg
SGⅡ2.90-3.600.80-2.500.40-1.200.20-0.60-0.20-0.60≥0.04
SGⅣ2.90-3.600.80-2.500.40-1.200.20-0.600.50-1.000.20-0.80≥0.04
SGⅤ2.90-3.600.80-2.500.40-1.200.30-1.201.01-2.000.20-0.80≥0.04
Prosperities&Application
SymbolHardness
HSTensile Strength
MPaBending
Strength
MPaDimension
MMUnit N.W
KGSApplication
SGⅡ50-70≥320500-700300-1300500-35000Rolls for finish stands of light section mills, bar and wire rod mills, hot narrow strip mills and temper mill.
SGⅣ55-70≥320500-700
SGⅤ60-70≥320600-800Edging Mill Roll
website:http://www.kdroll.com/cast-iron-and-steel-rolls/section-and-rail-mill-rolls/