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Silicolloy A2 Continuous Casting Roller< Usage examples of Silicolloy A2 Roller >Machine TypeA Usage Place①Cureved TypeA Foot Roll

②Cureved TypeApron Roll③

Cureved TypeA Foot Roll④

Cureved TypeA Foot Roll

321

⑤Cureved TypeA Top Roll

⑥Cureved TypeA Foot RollContinuous Casting Roller made from Silicolloy can save cost for maintainance by reducing numberof the times of replacements of rollers.

The number of iron and steel melting

AISIDIN

JIS

Conventional life321

X6CrNiTi18 10SUS321

1500

5000

3.3 Times

SUH6601000

6000

6.0 Times

Overlay welding(13％Cr-4％Ni)

1000

4800

4.8 Times

X6CrNiTi18 10SUS321

1500

9000

6.0 Times

4137

34CrMo4

SCM435800

8000

10.0 Times

321

X6CrNiTi18 10SUS321

1000

6000

6.0 Times(Heat-resistant steel) (Heat-resistant steel)

There are a lot of actual achievement of Silicolloy A2 roller which are used in iron mill,especially it is used in a facility to make steel billet.
Silicolloy A2 roller is commomly installed in continuous casting machine, especially as top roller which is a severe condition.
Sizes of roller which is commomly used are from φ70 ~ φ100 in dia. x 110mm ~ 330mm in length.
Around 15 companies have adopted Silicolloy A2 roller so far and total 2,000 pc. in around 5 years have been supplied to those companies.

＜Examination example of SilicolloyA2 Roll ①＞● Silicolloy A2 which is used for rollers is all-round stainless steel that contains high Si by around 3.5% .
Silicon contributes to many characteristics such as heat resistance, oxidation resistance,hardness, strength and corrosion resistance.
(Principal component) : 0.02C - 3.5Si - 11Cr - 7Ni - 1Mn - 1Cu - the rest Fe● There are a lot of actual achievements in Siliccoly A2 roller for top rollers (foot roller) to produce billets.

After use

No

Item

①

Continuous casting equipment

Manufacture of slab②

Type of material

Ordinary steel③

Size of slab

Width：1000～1500㎜,Thickness:200㎜④A Usage PlaceA Foot Roll （Division type）⑤

Size of roll

φ90～φ100 in dia. x 260㎜ , 6 Lines⑥A conventional material

321 / X6CrNiTi18 10 / SUS321⑦Usable years

3 months⑧

The number of iron and steel melting

1500,150,000 tons
（At the time of an investigation）

Details of contents

Silicolloy A2

321 / X6CrNiTi18 10 / SUS321● Life time of Silicolloy A2 roller is about three time aslong as that of 321(X6CrNiTi18 10).
● Surface of Silicolloy A2 roller after use is better
compared to that of 321(X6CrNiTi18 10).
● While 321(X6CrNiTi18 10) roller was disposedin 1000 charges due to cause of crack,・High-temperature oxidation resistance :Silicolloy A2 roller is comparatively strong against oxidation resistance in high temperature because of containing Si by around 3.5%.
・High temperature hardness・Wear resistance :Silicolloy A2 roller is superior in wear resistance because of relatively high hardness.
(ex. Hardness = normal temperature : HV320 / 600℃ : HV200)
・Hot strength :Silicolloy A2 roller is hard to deform and bend because tensile strength is high compared to exsiting material.
(ex. Tensile strangth = normal temperature : 1100N/mm2 / 500℃ : 600N/mm2)

Silicolloy A2 roller can be used up to 3000 charges.
● Abrasion loss：It is 2 millimeters at a diameter.

＜Examination example of SilicolloyA2 Roll ②＞
80.50

Material
80.00 ●●
●Silicolloy A2 roller is excellent in corrosion resistance against and strongly acidic powder.

3.Fracture toughness (heat check resistance) Silicolloy A2 roller is superior in fatigue propagation resistance.
Thus, it is hard to occur crack even though high temperature heating rapidly cooling are repeated.
4.High-temperature corrosion resistance / High-temperature wear resistance
Silicolloy which has all-round stainless steel can realize longlife improvement of roller.

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Silicolloy A2●②Short form（D side）：0.30㎜③The mean value：0.38㎜

79.00①Long form（A side）：2.62㎜●

Carbon steel tubes

78.50②Short form（D side）：2.08㎜③The mean value：2.35㎜

78.00

Silicolloy A2（Long form - C side）●● Life time of Silicolloy A2 roller is about six time as● Silicolloy A2（Short form - D side）

Top Roller

Abrasion loss （747charges）①Long form（C side）：0.45㎜

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●●
●

79.50
Diameter of roll（㎜）Characteristics of Silicolloy Roller

1.Heat resistance

2.Corrosion resisitanceLife of Silicolloy※Please be understanding in advance that the same eﬀect may not be expected depending on operating circumstances.

Silicolloy is precipitation hardened stainless steel having composite property such as heat resistance,
corrosion resistance, wear resistance and high-temperature oxidation resistance.

A conventional materialNo

Carbon steel tubes（Long form - A side）● Carbon steel tubes（Short form - B side）

77.50

long as that of Carbon steel tubes (STK).
● Abrasion loss（747charges,The mean value）
Silicolloy A2：0.38mm

77.00
0100200300

400500600

The number of iron and steel melting（times）

StrandAbrasion examination of the roll

600

800

Carbon steel tubes：2.35mm