KR19980052571A - Secondary Refinery Spray Material - Google Patents

Secondary Refinery Spray Material Download PDF

Info

Publication number
KR19980052571A
KR19980052571A KR1019960071586A KR19960071586A KR19980052571A KR 19980052571 A KR19980052571 A KR 19980052571A KR 1019960071586 A KR1019960071586 A KR 1019960071586A KR 19960071586 A KR19960071586 A KR 19960071586A KR 19980052571 A KR19980052571 A KR 19980052571A
Authority
KR
South Korea
Prior art keywords
clinker
particle size
spray material
clay
magnesite clinker
Prior art date
Application number
KR1019960071586A
Other languages
Korean (ko)
Other versions
KR100221802B1 (en
Inventor
조용문
양재익
Original Assignee
서상기
포철로재 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 서상기, 포철로재 주식회사 filed Critical 서상기
Priority to KR1019960071586A priority Critical patent/KR100221802B1/en
Publication of KR19980052571A publication Critical patent/KR19980052571A/en
Application granted granted Critical
Publication of KR100221802B1 publication Critical patent/KR100221802B1/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
    • C04B35/043—Refractories from grain sized mixtures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/6303—Inorganic additives
    • C04B35/6306—Binders based on phosphoric acids or phosphates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/6303—Inorganic additives
    • C04B35/6316—Binders based on silicon compounds
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/04—Blast furnaces with special refractories
    • C21B7/06—Linings for furnaces

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Ceramic Products (AREA)

Abstract

본 발명은 2차 정련로용 스프레이재에 관한 것으로, 입도 2-1mm 천연마그네사이트 클링커 19-21%, 입도 1mm 이하 천연마그네트사이트 클링커 59-61%, 미립의 천연마그네트사이트 클링커 14-16%인 원료에, 고융해성 결합재로서 인산계 0-1.5%, 규산계 0.5-3.5%, 점토계 0-3%, 실리콘초미분 0-2%, 석회계 0.-4%로 구성되어 천연마그네사이트 클링커에 점토계, 칼슘계 결합제를 첨가함으로써, 보론성분 및 인산성분을 감소하여 모재와의 접착성 및 탈수성이 양호하고, 고내식성 및 고부착성이 있고, 취부수분 폭이 넓으면서 손실이 적으며, 열간 강도가 높고, 폭열 및 박리가 없는 강의 품질 향상을 꾀할 수 있도록 한 효과가 있는 것이다.The present invention relates to a spray material for a secondary refining furnace, raw material having a particle size of 2-1mm natural magnesite clinker 19-21%, particle size 1mm or less natural magnetite clinker 59-61%, fine natural magnetite clinker 14-16% It is composed of 0-1.5% of phosphoric acid, 0.5-3.5% of silicic acid, 0-3% of clay, 0-2% of silicon ultrafine powder, and 0.-4% of lime. By adding clay-based and calcium-based binders, boron and phosphate components are reduced, so that adhesion and dehydration with the base material are good, high corrosion resistance and high adhesion, wide mounting moisture, and low loss. The hot strength is high, and there is an effect to improve the quality of the steel without thermal expansion and peeling.

Description

2차 정련로용 스프레이재Secondary Refinery Spray Material

본 발명은 2차정련로용 스프레이재에 관한 것으로, 보다 상세하게는 천연 마그네사이트 클링커에 점토계 및 칼슘계를 첨가하여 무보론 및 저인산계로 구성된 2차 정련로용 스프레이재에 관한 것이다.The present invention relates to a spray material for a secondary refining furnace, and more particularly, to a spray material for a secondary refining furnace composed of a boron and low phosphoric acid by adding clay and calcium to a natural magnesite clinker.

일반적으로 2차정련로용 스프레이재는 모재와의 접착성 및 경화가 양호해야 하고, 고내식성 및 고부착성을 요하며, 취부시 수분폭이 넓고, 손실이 적어야 하며, 열간 강고가 높고, 폭열 및 박리가 없는 것이어야 한다.In general, the secondary refining spray material should have good adhesion and hardening with the base material, high corrosion resistance and high adhesion, have a wide range of moisture, low loss, high hot rigidity, high heat and There should be no exfoliation.

종래에는 2차정련로용 스프레이재로서, 해수 마그네시아 클링커에 결합제로서 산화붕소(B2O3)계 및 산화납(P2O5)계를 첨가하였다. 산화납계의 보론성분은 철과 결합하여 인화철(Fe3P)이 되므로 입자의 조대화를 촉진시키고, 경도 및 인장강도는 증가시키지만, 연신도를 감소시키며, 상온에서 충격값을 저하시켜 상온취성(Cold Shortness)의 원인이 된다. 또한, 인화철(Fe3P)은 산화망간(MnO)과 접합하여 고스트 라인(Ghost line)을 형성하므로, 강파괴의 원인이 될 뿐만 아니라, 응고하여 입계에서 편석하기 쉽고, 확산속도가 늦어 고온에서 가열해도 확산하기 곤란하므로, 선상조직(Band Structure)으로 남기 때문에 충격값을 감소시키게 되어 과열의 중심이 된다. 더욱이, 결합제로서 해수 마그네사이트 클링커에 첨가되는 산화납계 인산성분은 내화물의 내식성을 저하시키고, 또한 강 내부에 혼입되어 취성(Brittleness)을 띄게 한다.Conventionally, boron oxide (B 2 O 3 ) type and lead oxide (P 2 O 5 ) type have been added to the seawater magnesia clinker as a spray material for the secondary refining furnace. The boron component of lead oxide is combined with iron to form iron phosphide (Fe 3 P), which promotes coarsening of particles, increases hardness and tensile strength, reduces elongation, and reduces impact value at room temperature. Cause of (Cold Shortness). In addition, since iron phosphide (Fe 3 P) is bonded to manganese oxide (MnO) to form a ghost line, it is not only a cause of strong fracture, but also easily solidifies and segregates at grain boundaries, and has a high diffusion rate. Since it is difficult to diffuse even when heated at, the impact value is reduced and remains a center of overheating since it remains as a band structure. Moreover, the lead oxide-based phosphate component added to the seawater magnesite clinker as a binder lowers the corrosion resistance of the refractory material and also becomes brittleness by incorporation into the steel.

이하 본 발명은 상기와 같은 제반 문제점을 해소하기 위해 안출된 것으로, 상기한 보론성분 및 인산성분이 강의 품질에 미치는 영향을 고려하여, 이에 대한 사용량을 감소시키면서, 강의 품질 향상을 꾀할 수 있도록 모든 천연 마그네사이트 클링커 원료에 고용해성 결합제로서, 적정 함량의 칼슘계, 규산계, 점토계 및 저인산계의 결합제를 첨가하여 매트릭스(Matrix) 부분을 보강하여 사용중 박리 및 탈락을 방지하고, 인산계 첨가량에 비해 분규계 함량을 증대시켜 모재와의 접착성 및 탈수성이 양호하고, 고내식성 및 고부착성이 있고, 취부수분 폭이 넓으면서 손실이 적으며, 열간 강도가 높고, 폭열 및 박리가 없는 2차정련로용 스프레이재를 제공함에 그 목적이 있다.The present invention has been made in order to solve the above problems, in consideration of the effects of the boron component and the phosphoric acid component on the quality of the steel, while reducing the amount used for this, all natural to improve the quality of the steel As a high-solubility binder to magnesite clinker raw materials, by adding an appropriate amount of calcium-based, silicic acid-based, clay-based and low-phosphate-based binders, the matrix part is reinforced to prevent peeling and dropping during use, and the amount of powder Improved adhesion and dehydration with the base material by increasing the system content, high corrosion resistance and high adhesion, wide range of mounting moisture, low loss, high hot strength, no secondary thermal refining The purpose is to provide a spray material for the furnace.

상기와 같은 목적을 달성하기 위한 본 발명은 입도 2-1mm 천연마그네사이트 클링커 19-21%, 입도 1mm 이하 천연마그네사이트 클링커 59-61%, 미립의 천연마그네사이트 클링커 14-16%인 원료에, 고융해성 결합재로서 인산계 0-1.5%, 규산계 0.5-3.5%, 점토계 0-3%, 실리콘초미분 0-2%, 석회계 0-4%를 첨가한 것을 특징으로 한다.The present invention for achieving the above object is high meltability in the raw material of the particle size 2-1mm natural magnesite clinker 19-21%, particle size 1mm or less natural magnesite clinker 59-61%, fine natural magnesite clinker 14-16% Phosphoric acid-based 0-1.5%, silicic acid-based 0.5-3.5%, clay-based 0-3%, ultrafine silicon powder 0-2%, and lime-based 0-4% are added.

이하 본 발명의 바람직한 실시예를 상세히 설명한다.Hereinafter, preferred embodiments of the present invention will be described in detail.

[실시예 1 내지 3][Examples 1-3]

표 1에 나타난 바와 같이, 입도 2-1mm 천연마그네사이트 클링커 20%, 입도 1mm 이하 천연마그네사이트 클링커 60%, 미립의 천연마그네사이트 클링커 15%인 원료에 고융해성 결합재로서 인산계 1~1.5%, 규산계 1.5~2.5%, 점토계 1~3%, 실리콘 초미분 0.3%, 석회계 4%를 첨가하여 2차 정련로용 스프레이재를 제조하고, 터언디쉬건(Turndish Gun)을 사용하여 0.8~1kg/㎠의 토출압, GMP 1~2의 수분량, 300mm의 스프레이 거리, 50kg의 스프레이량으로 상온 파일럿 시험을 행하고, 800~1000℃ 터언디쉬로에서 DB벽돌위에 주입하여 열간 파일럿 시험을 행하며, 45mm모울드에서 16%의 수분을 첨가하여 시편을 성형하고, 110℃에서 건조하여 1600~1800℃에서 30분간 4회 침식시험을 행하고, 300g의 시료에 16%의 수분을 첨가하여 1분간 혼련한 후, 침입도기로 3분, 5분, 30분 별로 측정하여 경화성 시험을 행하고, 4×4×16mm 주형 모울드에서 16%의 수분을 첨가하여 시편을 성형하고, 110℃에서 건조하여, 전기로에서 1000℃ 또는 1400℃에서 2시간동안 소성하여 물성시험을 행하고, 그 결과를 표 2에 나타내었다.As shown in Table 1, phosphoric acid 1-1.5% as a highly soluble binder for raw materials having a particle size of 2-1mm natural magnesite clinker 20%, natural magnesite clinker 60% or less of particle size 1mm or less, 15% of fine natural magnesite clinker, and silicic acid-based Spray material for secondary smelting furnace was prepared by adding 1.5 ~ 2.5%, 1 ~ 3% of clay system, 0.3% of ultrafine silicon powder, and 4% of lime system, and 0.8 ~ 1kg / using Turnish Gun. Perform pilot test at room temperature with discharge pressure of ㎠, moisture content of GMP 1 ~ 2, spray distance of 300mm, spray amount of 50kg, inject to DB brick in 800 ~ 1000 ℃ Turn-on-Down, and perform hot pilot test. The specimen was molded by adding 16% moisture, dried at 110 ° C., subjected to four erosion tests at 1600-1800 ° C. for 30 minutes, kneaded for 1 minute by adding 16% moisture to 300 g of sample, and then 3 minutes, 5 minutes, every 30 minutes , 16% moisture was added in a 4 × 4 × 16mm mold mold, and the specimen was molded, dried at 110 ° C., fired at 1000 ° C. or 1400 ° C. for 2 hours in an electric furnace, and tested for physical properties. Shown in

[비교예 1]Comparative Example 1

표 1에 나타난 바와 같이, 미립의 천연 마그네사이트 클링커 10%, 입도 2-1mm 해수 마그네사이트 클링커 20%, 입도 1mm 이하인 해수 마그네사이트 클링커 30%, 미립의 해수 마그네사이트 클링커 5%로 이루어진 혼합원료에, 결합제로서 인산염 4.5%, 분규계 0.5%, 점토계 0.5%, 칼슘계 1종 8%, 칼슘계 2종 3.5%를 첨가하여 2차 정련로용 스프레이재를 제조하여 실시예와 동일한 시험을 거쳐 그 결과를 표 2에 나타내었다.As shown in Table 1, phosphate as a binder in a mixed raw material consisting of 10% of fine natural magnesite clinker, 20% of particle size 2-1mm seawater magnesite clinker, 30% of seawater magnesite clinker having particle size of 1mm or less, and 5% of fine particle seawater magnesite clinker 4.5%, powder 0.5%, clay 0.5%, calcium type 1 8%, calcium type 2 3.5% were added to prepare a spray material for the secondary refining furnace. 2 is shown.

[비교예 2]Comparative Example 2

고용해성 결합제로서 인산염 1.5%, 점토계 0.5%, 실리콘초미분 1.0%, 칼슘계 2종 1.5%를 첨가하여 2차 정련로용 스프레이재를 제조하고, 실시예와 동일한 시험을 거쳐 그 결과를 표 2에 나타내었다.As a solid solution binder, 1.5% of phosphate, 0.5% of clay, 1.0% of ultrafine silicon powder, and 1.5% of two calcium-based powders were added to prepare a spray material for the secondary refinery, and the results were tested in the same manner as in Example. 2 is shown.

[표 1]TABLE 1

[표 2]TABLE 2

주) ◎:아주 좋음○:좋음×:나쁨Note) ◎: Very good ○: Good X: Bad

표 2로부터 알 수 있는 바와 같이, 본 발명에 따른 2차 정련로용 스프레이재는 고용해성 결합제로서 점토계, 분규계를 사용하여, 응력을 가하면 유동성이 증가하고, 제거하면 유동성이 감소하는 틱소트로픽 현상에 의해 스프레이성이 증가되기 때문에 부착성, 용수조절성, 토출성이 우수하고, 매트릭스(Matrix) 내에 첨가된 바인더의 상호 작용에 의해 열간내에서 강도를 증가시켜 슬래그 및 용강 흐름에 대한 내마모성을 향상시켜 내식성을 향상시켰다. 실시예 3은 경화성이 약간 저하되는 점이 있지만, 열간강도나 수분 조절폭이 각 비교예와 대동소 이하거나 우수함을 알 수 있다.As can be seen from Table 2, the secondary smelter spray material according to the present invention using a clay-based, powder-based system as a solid solution binder, thixotropic phenomenon that the fluidity increases when stress is applied, the fluidity decreases when removed It has excellent spraying property, water control property, and dischargeability because of increased spraying ability, and it increases the strength in hot by interaction of binder added in matrix, improving wear resistance against slag and molten steel flow. To improve the corrosion resistance. Although Example 3 has the point that sclerosis | hardenability falls slightly, it turns out that hot intensity | strength and water | moisture-control width are comparable with or superior to each comparative example.

이와 같이 본 발명에 따른 2차 정련로용 스프레이재는 무보론 및 저 인산계 결합제를 첨가하므로서, 보론성분 및 인산성분에 의한 영향을 제거하면서, 강의 품질 향상을 도모할 수 있는 것이다.As described above, the spray material for the secondary refining furnace according to the present invention can improve the quality of the steel while removing the influence of the boron component and the phosphoric acid component by adding a boron-free and low phosphoric acid-based binder.

Claims (1)

입도 2-1mm 천연마그네사이트 클링커 19-21%, 입도 1mm 이하 천연마그네사이트 클링커 59-61%, 미립의 천연마그네사이트 클링커 14-16%인 원료에, 고융해성 결합재로서 인산계 0-1.5%, 규산계 0.5-3.5%, 점토계 0-3%, 실리콘초미분 0-2%, 석회계 0-4%를 첨가한 것을 특징으로 하는 2차 정련로용 스프레이재.Particle size 2-1mm natural magnesite clinker 19-21%, particle size 1mm or less natural magnesite clinker 59-61%, particulate natural magnesite clinker 14-16%, high soluble binder as phosphoric acid 0-1.5%, silicic acid 0.5-3.5%, clay-based 0-3%, ultra-fine silicon powder 0-2%, lime-based 0-4% added spray material for the secondary smelting furnace.
KR1019960071586A 1996-12-24 1996-12-24 A spray material KR100221802B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019960071586A KR100221802B1 (en) 1996-12-24 1996-12-24 A spray material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019960071586A KR100221802B1 (en) 1996-12-24 1996-12-24 A spray material

Publications (2)

Publication Number Publication Date
KR19980052571A true KR19980052571A (en) 1998-09-25
KR100221802B1 KR100221802B1 (en) 1999-09-15

Family

ID=19490752

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019960071586A KR100221802B1 (en) 1996-12-24 1996-12-24 A spray material

Country Status (1)

Country Link
KR (1) KR100221802B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100315372B1 (en) * 1999-07-24 2001-11-26 김창호 A coating composition for the internal wall of converter and its preparations, and coating method using it
KR100412259B1 (en) * 2001-09-29 2003-12-31 김창호 preparations of coating composite of internal wall of converter and coating method using it
KR100890626B1 (en) 2008-08-29 2009-03-27 (주)원진월드와이드 Refractory repairing material for equipment of iron/steel making, method for preparing thereof and composition comprising the same
KR101130107B1 (en) * 2009-07-22 2012-03-28 주식회사 동국알앤에스 Basic refractories for reparing a furnace

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101026214B1 (en) * 2008-09-30 2011-03-31 박호성 spray mixture for An electric furnace including magnesia compound

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100315372B1 (en) * 1999-07-24 2001-11-26 김창호 A coating composition for the internal wall of converter and its preparations, and coating method using it
KR100412259B1 (en) * 2001-09-29 2003-12-31 김창호 preparations of coating composite of internal wall of converter and coating method using it
KR100890626B1 (en) 2008-08-29 2009-03-27 (주)원진월드와이드 Refractory repairing material for equipment of iron/steel making, method for preparing thereof and composition comprising the same
KR101130107B1 (en) * 2009-07-22 2012-03-28 주식회사 동국알앤에스 Basic refractories for reparing a furnace

Also Published As

Publication number Publication date
KR100221802B1 (en) 1999-09-15

Similar Documents

Publication Publication Date Title
KR19980052571A (en) Secondary Refinery Spray Material
EP0020022B1 (en) Plastic refractories with fused alumina-chrome grog
JPS6060985A (en) Refractory composition for ladle lining
US2068641A (en) Spalling resistant refractory brick
KR100481882B1 (en) MONOLITHIC REFRACTORIES UTILIZED SPENT Mg-Cr BRICK
JP2006513125A (en) Composition for production of heat-resistant ceramic molded body, molded body formed therefrom and use thereof
KR100508521B1 (en) A castable refractories composition containing carbon
JPH026373A (en) Cast amorphous refractory
JP2832064B2 (en) Fused alumina / magnesia composition and refractory products
JP4163783B2 (en) Alumina-silicon carbide refractories
JPH05170558A (en) Castable alumina-magnesia refractory for tilt iron spout of blast furnace
JPS6154746B2 (en)
JPS5950081A (en) Castable refractories
JPS63107873A (en) Flame spraying material
KR100373702B1 (en) Block Molding Using Alumina-Spinel Waste Castable
JPS5849669A (en) Anticorrosive indefinite form refractories
KR100286663B1 (en) Basic flame retardant for timing ladle
SU1096249A1 (en) Refractory protective daubing composition
JPS5934674B2 (en) Basic refractory composition
KR100468448B1 (en) Mg-Cr castable composition with residual expansion
KR970008698B1 (en) Spray composition
RU2027688C1 (en) Charge for dolomite refractory material making
JPH0360459A (en) Magnesian-calcian refractory
JPS62246858A (en) Magnesia calcta base burnt refractories
JPH10114580A (en) Alumina-magnesia base tundish coating material

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20130402

Year of fee payment: 15

FPAY Annual fee payment

Payment date: 20140603

Year of fee payment: 16

LAPS Lapse due to unpaid annual fee