I. YOTAI Introduction · Gunning repairing material: magnesia-dolomite materials G-HD100 22. ... is...

2

After-sales service

Introduction Typical cases

Content

3

I. YOTAI Introduction

YINGKOU NEW YOTAI REFRACTORIES CO., Ltd.China Liaoning

Advanced Equipment

Self-inspection before shipment

Self-inspection for report&size

Tunisia-MgO Carbon bricks & Mixes

II. After-sales service

Mongolia-Refractory installation

1) Contract Spirit

Egypt

III. Typical Cases

2) Technical Improvement for India –HOSPECT

MgO Carbon bricks

50 tons ladle

1st set trial order:97heats

2nd set trial order:104heats

3rd set technical improvement:110heats

Egypt :MgO-Cr Bricks

We design according to site condition and reached double lifetime in EISCO Egypt

3) Customer Praise Video

17

Detail Specification for steel making

The Refractories for Iron & Steel-making○ refractories for electric furnace

○ refractories for ladle

○ refractories for tundish

○ refractories for torpedo car

○ refractories for hot metal ladle

○ refractories for RH degasser

21

Refractories for EAF side wall

Use Brand

Sleeve of electrode：precast block CFC-18RX

Side wall bricks： MgO-C bricks S-NSA-110XMA

Permanent bricks：magnesia bricks HPT-B

Stamping materials（dry setting）:magnesia-dolomite

S-MD-DV

Eccentric bottom tap holeTerminal block：Al2O3-SiC-C bricksTapping tube： MgO-C bricks

ASG-XMG-15SX

Electrode of furnace bottom：MgO-C bricks

MG-16BSX

Gunning repairing material: magnesia-dolomite materials

G-HD100

22

Side wall refractories for EAF

● Base of carbon content is set as 20% to take advantage of carbon characteristics.● Varieties of brands are developed by corporate with different grades of raw materials and carbon contents.● High durability is carried out for hot spots by adopting high purity materials and dense construction.● Bricks used for except hot spots are took into account of balance and durability and cost by replacing grade of materials.● Low carbon type supports for oxidization damage by oxidization slag.

Especially S-NSA has developed as especially for side wall hot spots in bricks for

electric arc furnace. In order to meet variety of needs, YOTAI supplies plenty of

variations by replacing grade of raw materials or quantity of carbon, introduced below.

S-NSA-

130X

S-NSA-

115XMA

S-NSA-

110XMA

S-NSA-

108XMA

S-NSA-

320X

S-NSA-

220X

S-NSA-

120X

S-NSA-

120XMA

Material Purity

C(%)

Feature of S-NSA Typical Variations of S-NSA

23

S-NSA-320X S-NSA-220X S-NSA-120X S-NSA-120XMA

Chemical Composition (%)MgO

C7620

7620

7720

7820

Physical PropertyBulk DensityApparent Porosity (%)

2.853.0

2.883.0

2.903.0

2.953.0

CCS (MPa) 30 30 35 40Use FB, ML SL, ML HS, SL HS , SLFeature

Low cost GeneralCorrosion resistance

Corrosion resistance

S-NSA-130X S-NSA-115XMA S-NSA-110XMA S-NSA-108XMA

Chemical Composition (%)MgO

C6528

8215

8510

898

Physical PropertyBulk DensityApparent Porosity (%)

2.783.0

3.003.0

3.073.0

3.182.0

CCS (MPa) 35 40 45 50Use HS HS, SL SL SLFeature

High C quantityFor HS

General for DC furnace

General for DC furnacePeroxide

resistance

For DC furnacesPeroxide

desistance

Technical data of side wall refractories

FB: Free board part ML: Metal line part SL: Slag line part HS: Hot spot part 24

Refractories for EAF bottom tap hole

Use Brand


Side wall bricks： MgO-C bricks S-NSA-110XMA


Stamp castables（dry setting）:magnesia-dolomite

S-MD-DV


ASG-XMG-15SX


MG-16BSX


G-HD100

25

Refractories for EAF bottom taping hole（E.B.T）

Eccentric bottom tapping has been applied as a latest technology. High resistances to

corrosion, spalling, oxidation are required for refractories for E.B.T. YOTAI provides

the best material for each sections.

Structure and Material

Structure Chart of EBT

MG-15CX

MG-15SX

ASG-X S-MH

Tapping tube

Setting brick

Terminal block

Sealing stamp material

Chemical Composition(%）SiO2

Al2O3MgOSiCC

76

16

76

14

270

1012

5

90

Apparent Porosity （%） 5 6 7

Bulk Density 2.92 2.90 2.90

Cold CrushingStrength（MPa）

42 40 50

Grain composition（％）1.18≦0.09>

4240

26

Refractories for DC EAF

BlandMG-

16BSXMG-11BX

HPT-BCFC-18RX

UseElectrode of furnace

bottomBack-up

Sleeve of electrode

ChemicalComposition(%）

SiO2Al2O3MgOCaOC

78

16

86

11

2.5

941

986

Apparent Porosity（%） 3.5 3.0 18 18

Bulk Density 2.93 3.07 2.87 2.85

Cold CrushingStrength（MPa）

40 58 70 40

27

Refractories for EAF hearth

Use Bland


Work bricks： MgO-C bricks S-NSA-110XMA



S-MD-DV


ASG-XMG-15SX


MG-16BSX


G-HD100

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Wet Type Stamping Material● Superior in slag corrosion

resistance.● Grades are divided by

magnesia raw material.● Mix after adding bittern

solution or Magnesium Chloride powder with water

● Constructed by rammer or vibrating stamping machine.

Wet type of stamping material, which magnesia is mixed with bittern solution and molded

by rammer, is generally used for lining material for hearth of electric arc furnace. However,

in case of severe operation conditions on hearth of DC furnace or any, dry type of

magnesia-dolomite stamping material which emphasizes sinterability is mainly chosen.

YOTAI supplies kinds of materials introduced below.

Stamping material for EAF hearth

S-MT –DV S-MT-DV2 S-MT-DV3 S-MT -DP

Chemical Composition (%)

MgO 93 95 94 93

SiO² 3 2 2 4

Grain composition (%)

Maximum grain 5mm 5mm 5mm 5mm

1.2mm< 47 47 47 47

0.09mm> 23 24 23 21

balanced

with both

sinterability

and

corrosion

resistance

by using

seawater

magnesia

clinker.

corrosion

resistant

type by

using fused

magnesia

clinker.

sinterable

type by

using

natural

magnesia

clinker.

adjusted

grain sizes

for rammer

by using

seawater

magnesia

clinker.

29

Dry Type Stamping

Material•Superior to sinterability.Dense and high intensity construction can be offered.•Grades are divided by amount of dolomite material.•Constructed by vibration fabrication in dry condition.

S-MD-DV56 S-MD-DV65 S-MD-DV30B S-MD -DV

Chemical Composition (%)

MgO 80 73 84 85

CaO 13 17 12 10

Fe₂O₃ 1 3

Maximum

grain10mm 10mm 10mm 10mm

1.2mm< 48 48 51 49

0.09mm> 17 17 21 22

CCS (MPa)

1500℃x3h65 78 80 90

Added materials

Magnesia □ □ ○ ○

Dolomite ○ □ ○ □

Iron bonded

Magnesia× × ○ □

basic type. improved

sinterability by

increasing

amount of

dolomite.

improved

sinterability by

adding iron

bonded

magnesia

clinker.

improved

sinterability

the most.

Suitable in

front of work

door of DC

furnace and

around

electrode

circumference

of DC furnace

bottom.

* □:Much ○:Little ×:None30

Refractories for EAF repairing

Use Bland


Work bricks： MgO-C bricks S-NSA-110XMA



S-MD-DV


ASG-XMG-15SX


MG-16BSX


G-HD100

31

Gunning materials for EAF

These materials are applied for hot gunning for electronic furnace repair, and used of basicgunning material in general. Yotai consider for various kind of materials and develop thematerials to get the satisfaction by user, and the introduction is mentioned as below.

● We have general type using virgin materials, and cost cut type using recycled materials.

● Our general type has Magnesia G-E series for corrosion resistance, Magnesia dolomite G-MD/HD series for Sinterability to wall of furnace and Magnesia spinel type of G-E1SP/BSP8 for suitable to operation in low C/S slag line.

● Our cost down type has Magnesia Chrome G-R2Y, that is made by recycled material. The recycled material after using at the furnace is provided by steel manufacturer, and is done for sizing and grading.

Features

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G-E1 G-E3T G-E7S G-E8S

Chemical composition(％)MgO 88 89 91 91SiO2 3 3 3 3CaO 2 2 2 2

Grain composition（％）

Maximum grain 5mm 5mm 5mm 3mm

1.2mm< 40 40 45 35

0.09mm> 29 29 28 33

FeatureGeneral type by natural magnesia

Fine part of material of sea water magnesia, and improved for corrosion resistance

Material of sea water magnesia, further improvement for corrosion resistance

Main material of sea water magnesia, and grain composition for good adhesion

G-MD-EN G-HD50 G-HD100

Chemical composition(％)

MgO 83 68 70SiO2 4 4 3.5CaO 7 22 23

Fe2O3 1 2.5 2.5


Maximum grain 5mm 5mm 5mm

1.2mm< 40 45 450.09mm> 27 28 28

FeatureBased material of G-E1, additional of dolomite to get sinterability

Use of high calcium dolomite for improvement of sinterability, and material of natural magnesia

Base material of G-HD50, and use of sea water magnesia

Table 1 Magnesia type

Table 2 Magnesia dolomite type

Chemical composition, grain composition and features

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Chemical composition, grain composition and features

34

G-E1SP G-BSP8 G-R2Y

Chemical composition(％)

MgO 85 78 81

SiO2 3 3 5

CaO 2 2 2

Al2O3 6 15 -

Cr2O3 - - 5


Maximum grain 5mm 5mm 5mm

1.2mm< 40 43 40

0.09mm> 29 29 29

FeatureBase material of G-E1,

additional of spinelMain material of spinel

Base material of G-E1,

and additional of

recycled magnesia

chrome

Table 3 Magnesia spinel、Magnesia chrome

Bland

Castable for the roof ：high alumina castable

C-160

Bricks for free board：MgO-C bricks LD-MG-18XE

Bricks for lining of slag line：MgO-C bricks

LD-MG-14XFK

Bricks for lining of metal line ：Al2O3‐MgO‐C bricks

LD-AM20CX

Bricks for the lining of bottom ：Al2O3‐MgO‐C bricks

LD-AM10CX

Bricks for well block：Al2O3-MgO precast block

CFC-ASP-SRX

Ramming materials for the corner of bottom：Al2O3‐MgO‐C ramming materials

R-AMC

Bricks for the permanent of slag line ：MgO-C bricks

LD-MG-15XE

Bricks for the permanent of bottom and metal line： Al2O3 bricks

LD-BA-1

Refractories for ladle

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Universal use

Slag line Free board

LD-MG-15X

LD-MG-14XFK

LD-MG-18XE

Chemical composition(%)MgO

C7915

8114

7815

Bulk densityApparent porosity(%)

2.964.0

2.983.8

2.834.5

Modulus of rupture(MPa)at R.T

at 1400℃1613

1914

158

Cold crushing strength(MPa)40 44 37

36


Brick

Metal line Bottom

LD-AM20CX

LD-AM10CX

LD-AM20CX-

B

Chemical composition(%)Al2O3MgO

C

652010

751010

63209


3.204.5

3.244.5

3.225.0

Cold crushing strength(MPa) 45 45 45

Thermal expansion(%)1000℃ ＋0.8 ＋0.7 ＋0.8

Permanent linear change(%)1500℃×3h ＋1.1 ＋0.9 ＋1.2

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Refractories for big volume ladle

Castable

Metal line Bottom

CFC-ASP-MW3

CFC-ASP-JKM4

CFC-ASP-JKB1

CFC-ASP-BW1

Chemical composition(%)Al2O3MgOSiO2

9261

9171

9441

934.51

Cold crushing strength(MPa)110℃×24h1500℃×3h

2570

2870

3455

3460

Permanent linear change(%)1500℃×3h ＋2.0 ＋2.0 ＋2.2 ＋2.1

38


Brand CFC-ASP-SRX

Chemical composition

Al2O3

MgO

91

4

Bulk Density

Apparent Porosity(%)

3.35

12.0

Cold Crushing Strength(MPa) 70

39

Refractories for LF ladle

Brand CFC-ASP-1D R-AMC

Material Castable Ramming

Chemical composition(%)Al2O3SiO2MgO

C

9314

56

299

Cold crushing strength(MPa)110℃×24h1000℃×3h1500℃×3h

4065

110

26-

36

Linear change (%)110℃×24h1000℃×3h1500℃×3h

-0.1＋0.7＋1.0

--

＋1.2

Quantity required (kg/m3) 3,100 2,550

40


Brand C-160 C-170N C-190LDC-ASP-LDR2

Use Ladle lip Repair material

Chemical composition(%)Al2O3SiO2

5637

8112

96 869


221335

281937

23-

35

52550

Linear change (%)1000℃×3h1500℃×3h

-0.2-0.7

-0.2-0.6 ＋0.4

-0.3＋0.2

41

Use Bland

The cover of tundish：high alumina castable

CFC-16TCFC-18T

The castable for the lining :high alumina castable

CFC-TD-80

Bricks for slag dam :magnesia bricks:high alumina bricks

TBX-SY-1TBX-A2

Coating materials :magnesia coat TD-C-M7

Block for impact zone：Al2O3-SiC-C block LD-AGX-T2

Nozzle for casting：zirconia nozzle YZN

Well block：high alumina block SK35

Ramming materials：SiO2-Al2O3-SiC ramming materials

R-AMC

Repairing materials by trowelling：high alumina castable

C-170M

Patching materials :high aluminaP-AP60P-AP80

The outline of the refractories for tundish

42

Refractories for Tundish

BrandCFC-TD-

80CFC-TD-

65CFC-TD-

60


8016

6531

6036

Maximum grain(mm) 8 8 8


407095

509090

55100100


-0.1＋0.3

-0.1＋0.7

-0.1＋0.8

Thermal linear expansion(%)at 1000℃ ＋0.6 ＋0.5 ＋0.5

Mixing water(%) 5.0-6.0 6.5-7.5 6.0-7.0

Quantity required (kg/m2) 2,850 2,500 2,400

43

Use Bland

The cover of tundish：high alumina castable

CFC-16TCFC-18T

The castable for the lining :high alumina castable

CFC-TD-80

Bricks for slag dam :magnesia bricks:high alumina bricks

TBX-SY-1TBX-A2

Coating materials :magnesia coat TD-C-M7

Block for impact zone：Al2O3-SiC-C block LD-AGX-T2

Nozzle for casting：zirconia nozzle YZN

Well block：high alumina block SK35

Ramming materials：SiO2-Al2O3-SiC ramming materials

R-AMC

Repairing materials by trowelling：high alumina castable

C-170M

Patching materials :high aluminaP-AP60P-AP80


44

Characteristics 『CFC-16T』『CFC-18T』

・No large shrinkage and expansion・No bias of expansion and shrinkage in heating and cooling.

Reduce gap of expansion and shrinkage in repeated heating by using chamotte and high alumina aggregates.

Reduce tendency of shrinkage in repeated heating by adding expansible raw material to high alumina aggregates.

・No corrosion under used temperature・Few formation of low melting point material

Low cement castablecontained over 50 ％alumina. Superior heat resistance.

Low cement castablecontained over 80％alumina.Greater heat resistance than CFC-16T.

・No peeling during operation.

Prevent peeling by adding heat resistance stainless fiber.

Prevent peeling by adding heat resistance stainless fiber.

・Cost・Quantity reguired

・Cheaper than 18T.・Quantity required is few, and unit price is cheap.

・More expensive than 16T.・Much quality required

Volume Stability

Heat resistance

PeelingResistance

Others

Comparing Characteristics

45

3.Evaluation of CFC-16T and CFC-18T

『CFC-16T』・Tundish cover material for general purpose ・For customers required volume stability ・Basic material to develop new material in order to fulfill customer's multi needs.

『CFC-18T』・Recommended in usage condition required more heat resistance than 16T.・For customers required high corrosion resistane and high heat resistance

Brand CFC-16T CFC-18T

Maximum Service Temperature(℃) 1600 1800

Chemical Composition(%)Al2O3SiO2SiC

56393

8214

Maximum grain (mm) 8 8

Cold Crushing Strength(MPa)110℃×24h1500℃×3h

5085

4078

Linear Change(%)110℃×24h1500℃×3h

-0.1＋0.9

-0.1＋0.1

Water Required (%) 7.0～9.0 6.0～8.0

Quantity Required(kg/m3） 2400 2800

Feature

・General purpose ・Used at blast furnace and electric arc furnace

・High heat resistance ・Used for electric arc furnace

4.Technical Data

46


Brand LD-AGXLD-AGX-

T2Z10B

Chemical composition(%)Al2O3SiO2ZrO2SiCC

75

12.57

75

12.57

63259


3.009.5

2.909.5

3.6518.0

Cold Crushing Strength(MPa) 40 40 80

Thermal linear expansion(%)at 1000℃ 0.65 0.6 0.50

47


BrandTD-C-M7

G-TD100

W

TBX-SY-1

Material Coating Gunning Board

Chemical composition(%)Al2O3SiO2MgO

31082

487

124

75

Maximum grain (mm) 3.0 3.0

Grain composition (%)1.2mm≦

0.09mm≧2443

2033


2.1632.0

Cold crushing strength(MPa) 11

48


Brand TBX-A2

Material Weir wall


6729


2.3018.0

Cold crushing strength(MPa) 25

49

YZN SK35

Chemical composition(%)Al2O3SiO2MgOCaOZrO2

0.4

4.394.6

5144


4.9013.1

2.1824

Cold crushing strength(MPa) 88.2 29


50

Brand P-AP60 P-AP80 C-170M


6034

8411

6031


51025

5

35

201430


--1.5

--1.0

-0.2-0.7


51

Brand TC-AGX-1T TC-AMGX-3S TC-AGX-1M TC-AGX-IB

Use Roof Slag line Metal line Impact area

Chemical composition(%)Al2O3MgOSiCC

82

10

7353

13

72

615

65

615


3.207.0

3.204.0

3.106.0

2.7810.0

Cold Crushing Strength(MPa) 40 40 40 45

Refractories for torpedo car

Use Bland

Roof TC-AGX-1T

Slag line TC-AMGX-3S

Metal line TC-AGX-1M

Impact area TC-AGX-IB

52

Use Bland

Slag lineLD-ARGX-4MKOLD-AMGX-2K

Metal lineLD-ARGX-3MOLD-AMGX-2K

Bottom LD-ARGX-1SK

Brand LD-ARGX-4MKO LD-AMGX-2K LD-ARGX-3MO LD-ARGX-1SK

Use Slag line SL・ML Metal line Bottom

Chemical composition(%)Al2O3SiO2MgOSiCC

5913

1211

69453

13

4927

712

3842

117


2.838.5

3.006.0

2.827.0

2.557.0

Cold Crushing Strength(MPa) 41 40 42 33

Refractories for hot metal ladle

53

Refractories for RH degasser

BrandRRR-

DBC20RRR-RH-

100RRR-DBS-

HNYRRR-

U36RHRRR-

U34LM

PropertiesRebonded

brickSemi-

rebondedbrick

Semi-rebonded

brick

Direct-bonded

brick

Direct-bonded

brick

UseLower

vessel wallLower

vessel wall

Lower /Upper

vessel wallsnorkel

snorkel

Lowervesselwall

(upper)

Chemical composition(%)

MgOCr2O3

6524

5627

5723

6415

5718


3.28

14

3.29

13.8

3.25

14.5

3.15

15

3.15

15

Cold Crushing Strength(MPa) 80 80 60 60 60

54

Refractories for RH degasser

Brand CFC-ASP-SN3 G-MR100ST

Chemical composition(%)Al2O3MgO

925 86

Grain composition(%)1.2mm≦

0.09mm≧4729

1933

Cold Crushing Strength(MPa)110℃×24h1500℃×3h

4536

Linear change (%)1500℃×3h ＋2.85

55

THANKS FOR YOUR KIND LISTENNING!

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I. YOTAI Introduction · Gunning repairing material: magnesia-dolomite materials G-HD100 22. ... is...

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Transcript of I. YOTAI Introduction · Gunning repairing material: magnesia-dolomite materials G-HD100 22. ... is...