Rongsheng Refractory Factory

Category: Products

  • Zirconium Mullite Bricks

    Zirconia mullite bricks are classified into burned zirconia mullite bricks and fused zirconia mullite bricks.
    Raw materials of burned zircon mullite bricks are high alumina bauxite and zircon. Burned zirconia mullite bricks such as anti-stripping high alumina bricks have good thermal shock resistance and abrasion resistance, besides, the addition of zircon also enhances high alumina material alkali corrosion resistance. burned zirconia mullite bricks are widely used in glass kilns.

    Zirconia mullite bricks physiochemical indexes

    Items ZM-17 ZM-20 (Zirmul) ZM-25 (Vista) ZM-30 ZM-11
    Chemical composition % Al2O3 ≥70 ≥59 ≥57 ≥47 ≥72
    ZrO2 ≥17 ≥19.5 ≥25.5 ≥30 ≥11
    SiO2 ≤12 ≤20 ≤14.5 ≤20 ≤12
    Fe2O3 ≤0.5 ≤0.5 ≤0.5 ≤0.3 ≤0.5
    Apparent Porosity % ≤17 ≤17 ≤17 ≤18 ≤17
    Bulk Density  g/cm3 ≥3.15 ≥2.95 ≥3.15 ≥3.10 ≥3.1
    Cold Compressive Strength  MPa ≥90 ≥100 ≥120 ≥100 ≥90
    0.2Mpa Refractoriness Under Load T0.6 °C ≥1650 ≥1650 ≥1650 ≥1650 ≥1630
    Reheating Linear Change (%) 1500°C×2h ±0.3 ±0.3 ±0.3 ±0.3 ±0.3
    20-1000°C Thermal Expansion % (×10-6/℃) 0-0.6 0-0.6 0-0.6 0-0.6 0-0.6
    Thermal Conductivity (Average800°C) W / (m·K) ≤ 2.19 ≤ 2.19 ≤ 2.1 ≤ 2.1 ≤ 2.19

    Zirconia mullite bricks applications

    Fused zirconia mullite bricks are mainly used at glass tank furnace melting tank sidewalls low temperature part, as zirconia mullite bricks have good corrosion resistance and thermal shock resistance to molten glass liquid. Working tank upper structure feed nozzle upper part is constructed by zirconia mullite bricks, because they don’t contain glass phase and won’t pollute glass, and they also have strong resistance to alkaline vapors corrosion and solidified alkaline materials.

  • Magnesia Zirconium Brick

    Direct adding method is adding ZrO2 containing material into magnesia according to required MgO/ZrO2 ratio and purity. Pre-synthesis method is the one through which MgO-ZrO2 clinker is produced and added into magnesia batch material. Surface coating method is used to coat ZrO2 based refractory to magnesia grains, so the surface of every grain forms homogeneous ZrO2 thin layer.
    Compared with pure MgO material, the addition of ZrO2 can contribute to sintering, so magnesia zirconia bricks can be sintered at relatively lower temperature. With the increase of ZrO2 content, MgO-ZrO2 bricks have higher bulk density, lower porosity, higher cold and high temperature strength. The addition of ZrO2 can improve thermal shock resistance, and the higher ZrO2 content, the stronger thermal shock resistance.

    Magnesia Zirconia Bricks Physiochemical Indexes

    Item MGZ-a MGZ-b MGZ-c
    MgO % 95 93 96.2
    CaO % 1.4 1.2 0.9
    ZrO2 % 1.8 3.0 1.4
    SiO2 % / 0.9 0.8
    Al2O3 % / 0.4 0.3
    Fe2O3 % / 0.7 0.6
    Apparent porosity % 15.0 15 13
    Bulk density g/cm3 2.96 2.98 3.11
    Crushing strength Mpa 80 70 80
    Refractoriness under load ℃ 1700 1680 1700

    Magnesia zirconia bricks are used in glass kiln regenerator checkerwork upper part and middle part and glass kiln combustion chamber upper structure. Magnesia zirconia bricks contains large amount of forsterite and zirconia, since they have strong corrosion resistance, the corrosion resistance of magnesia zirconia bricks is improved. Regenerator upper part temperature is about 1300℃, magnesia zirconia bricks can totally meet working environment. Besides, magnesia zirconia bricks also suffers SiO2 corrosion, alkaline vapor corrosion and sulfur corrosion.

  • High Chrome Bricks

    High Chrome Bricks Technical Data

    Item RS-Cr94 RS-Cr92 RS-Cr90 RS-Cr80
    Cr2O3 % 94 92 90 80
    TiO2 % 3.8 3.8 4 –
    Apparent Porosity % ≤16 ≤20 ≤20 ≤20
    Bulk Density g/cm3 ≥4.33 ≥4.05 ≥4.1 ≥4.00
    Cold compressive Strength MPa ≥200 ≥100 ≥100 ≥100
    0.2Mpa Refractoriness Under Load T0.6 ℃ ≥1700 ≥1680 ≥1680 ≥1670

     Application of High Chrome Bricks

    High chrome brick (Cr2O3 ≥ 90%) is mainly used for coal chemical industry, chemical industry furnace, alkali-free glass fiber kiln, waste incinerator and other key parts of the furnace.

    Zhengzhou RongSheng Kiln Refractory Co. Ltd. is one of leading manufacturers and distributors of high quality refractories for use in industries including steel plants, cement producers and glass works.
    Our company can provide not only the domestic and foreign customers excellent quality of high-temperature thermal insulation material, but also the first-rate service including professional furnace lining design, installation supervision, engineering construction etc.

    We can provide our customers with professional and personalized products and engineering services according to the actual working condition and requirements of each customer, in order to meet customers’ increasing demand of energy-saving and products quality improving, Our tenet is: quality and credibility is fundamental, technology and service is the life.

  • Slide Gate Plate

    High performance slide plate characteristics

    1. Slide plate carbon content is low, oxidization caused large area scratch seldom happens, so it is more suitable for low carbon steel and ultra low carbon steel casting.
    2. Slide plate has high mechanical strength at high temperature, multi times continuous sliding caused dilatation is reduced.
    3. Good thermal shock resistance. Stripping phenomenon is avoided, there is only small crack, steel casting safety is ensured.
    4. Special composite carbon is adopted, oil impregnation procedure is avoided, working environment is improved.

    High performance slide plate physiochemical indexes

    Item RS-HB-A RS-HB-B RS-HB-C RS-HB-D
    Al2O3 % 75 80 80 70
    MgO % / / /
    ZrO2 % / / / 5
    C ≤6 ≤6 ≤8 3
    Bulk density g/cm3 ≥ 3 3.05 2.95 3
    Apparent porosity %≤ 10 10 10 11
    Crushing strength Mpa ≥ 100 120 100 95

    High temperature sintered slide plate

    High temperature sintered slide plates feature in high mechanical strength, washing resistance, good thermal shock resistance and so on. High temperature intered slide plate are first choice for large and middle size steel ladles and tundish continuous casting.  We supply alumina carbon high temperature sintered slide plate, alumina zirconia carbon high temperature sintered slide plates and magnesia spinel slide plate, which can meet various species of steel casting requirement.

    High temperature sintered slide plate physiochemical indexes

    Item RS-SHB-A RS-HB-B RS-HB-C RS-HB-D
    Al2O3 % 70 75 75 60
    MgO % / / 4 /
    ZrO2 % / / 4 /
    C 4 4 4 4
    Bulk density g/cm3 ≥ 2.85 2.9 3.05 3
    Apparent porosity %≤ 6 6 6 6
    Crushing strength Mpa ≥ 90 100 100 100

  • Ladle Nozzle

     

    Ladle upper nozzle physiochemical indexes

    Item RS-SSK-1 RS-SSK-2 RS-SSK-3 RS-SSK-4
    Al2O3 % ≥ 80 75 60 65
    MgO % ≥ / / /
    C % ≤6 ≤6 4 4
    Bulk density g/cm3 ≥ 2.9 2.8 2.6 2.65
    Modulus of rupture Mpa ≤ 15 15 15 15
    Crushing strength Mpa ≥ 70 60 40 25

     

    Ladle lower nozzle

    RS series lower nozzle raw materials are corundum, high alumina bauxite, flake graphite, antioxidant, phenolic resin and so on. Lower nozzles character in good thermal shock resistance, strong erosive corrosion resistance, good rupture resistance and so on.

    Item RS-XSK-1 RS-XSK-2 RS-XSK-3 RS-XSK-4 RS-XSK-5
    Al2O3 % ≥ 75 55 68 60 65
    MgO % ≥ / / / /
    C % 6 5 4 4 4
    Bulk density g/cm3 ≥ 2.8 2.6 2.7 2.7 2.65
    Apparent porosity % ≤ 15 15 15 15 15
    Crushing strength Mpa ≥ 60 40 40 40 25

     

    Long nozzle(ladle shroud)

    Long nozzle is functional refractory connects ladle and tundish. Long nozzle plays the role of stabilizing steel liquid flow state, avoiding steel liquid oxidization, keeping steel liquid from splashing, etc. RS series high grade roasting-free long nozzle has excellent thermal shock resistance, good steel liquid washout resistance, excellent slag resistance and so on. Besides, RS long nozzles also feature in convenient operation, significant improvement of working condition.

     

    Long nozzle physiochemical indexes

    Item RS-CSK-1 RS-CSK-2 RS-CSK-3 RS-CSK-4
    RS-CSK-5
    Main body Slag line Main body Slag line
    Al2O3 % 45 / 45 35 40 50
    SiO2 % 20 / 20 25 20 10
    C+SiC  % 25 25 25 40 25 25
    ZrO2 % / 60 / / / /
    Bulk density g/cm3 ≥ 2.3 3 2.3 2 2.25 2.3
    Apparent porosity % 20 19 20 19 23 20
    Crushing strength Mpa ≥ 22 10 22 10 22 22
    Cold modulus of rupture Mpa ≥ 6 4 6 4 6 6
    Thermal shock resistance (1100℃, water cooling)/times 5 5 5 5

     

    Submerged entry nozzle

    Submerged entry nozzle plays the role of keep steel liquid from air oxidization when it flows from tundish to crystallizer, besides, it also has the function of evenly distributing steel liquid to crystallizer and controlling  steel liquid flow state at crystallizer. RS series submerged nozzle has  good slag corrosion resistance, blocking resistance, long service life, low accident rate and so on.

     

    Submerged entry nozzle physiochemical indexes

    Item RS-JSK-1 RS-CSK-2 RS-CSK-3
    Main body Slag line Main body Slag line Main body Slag line
    Al2O3 % ≥ 40 / 45 / 35 /
    SiO2 % ≤ 20 / 15 / 25 /
    C+SiC  % ≥25 ≥13 ≥22 ≥13 ≤40 ≤25
    ZrO2 % / 70 / 75 / 60
    Bulk density g/cm3 ≥ 2.2 3.4 2.3 3.55 2 3
    Apparent porosity %≤ 20 19 18 18 19 19
    Crushing strength Mpa ≥ 20 20 20 14 10 10
    Cold modulus of rupture Mpa ≥ 6 5 8 5 4 4
    Thermal shock resistance (1100℃, water cooling)/times 5 5 5

     

    Tundish upper nozzle

    Tundish upper nozzle is inserted into well block during using, it can control steel liquid flow rate combined with stopper. RS series tundish upper nozzle has excellent washout resistance, good thermal shock stability, good corrosion resistance and blockage resistance. When matched with RS series integral stopper, tundish continuous casting times can be significantly increased.

    Item RS-HBZ-A R RS-HBZ-B
    Chemical composition(%) ≥ Al2O3 55 60
    ZrO2 5 5
    C 3 8
    Bulk density g.cm3 ≥ 2.85 2.85
    Apparent porosity % ≤ 15 15
    Crushing strength Mpa ≥ 60 40

     

    Tundish upper nozzle physiochemical indexes

    Item RS-ZSK-1 RS-ZSK-2 RS-ZSK-3
    Main body Bowl part Main body Bowl part Main body Bowl part
    Al2O3 % ≥ 45 65 45 50 45 /
    SiO2 % ≤ 15 10 15 5 15 /
    C+SiC % ≥ 22 10 22 ≤20 22 ≤20
    MgO % ≥ / / / 15 / 60
    Bulk density g/cm3 ≥ 2.3 2.7 2.3 2.3 2.3 2.6
    Apparent porosity %≤ 18 16 18 17 18 19
    Crushing strength Mpa ≥ 20 25 20 20 20 15
    Cold modulus of rupture Mpa ≥ 8 8 8 10 8 5
    Thermal shock resistance (1100℃, water cooling)/times ≥5 ≥5 ≥5

     

    Tundish porous upper nozzle

    To prevent blockage, traditional tundish upper nozzle and submerged nozzle service life is short. So porous tundish upper nozzle is developed to overcome this shortcoming. According to structure and function, tundish porous upper nozzles are classified into non-fast changing porous upper nozzle and fast changing porous upper nozzle(submerged nozzle can be quickly changed to promise the consistency of casting). Especially porous fast changing upper nozzle can significantly increase tundish life, although the service life of submerged nozzle is relatively low. Currently used slab tundish service life is longer than 10 hours.

    Item RS-TZSK-1 RS-TZSK-2 RS-TZSK-3
    Main body Bowl part Porous inner lining Main body Bowl part porous inner lining
    Al2O3 % ≥ 45 65 55 65 50 50 50
    SiO2 % ≤ 25 10 5 10 10 5 10
    C+SiC % ≥ 25 10 20 / 22 ≤20 22
    MgO % ≥ / / / / / 15 /
    Bulk density g/cm3 ≥ 2.2 2.7 2.4 2.3 2.4 2.3 2.4
    Apparent porosity %≤ 20 16 25 16 18 17 18
    Crushing strength Mpa ≥ 22 25 20 40 20 20 20
    Modulus of rupture Mpa ≥ 5 8 5 / 8 10 8
    Thermal shock resistance (1100℃, water cooling)/times ≥5 / ≥5

     

    Metering nozzle

    Metering nozzles mainly adopt insertion method and, are classified into ordinary metering nozzle and quick changing metering nozzle. The main chemical composition of nozzle core is zirconia, so metering nozzle has high refractoriness, good thermal shock resistance, nice corrosion resistance, washing resistance, small nozzle hole enlargement, long service life and so on. Relying on quick change system, multi-lower nozzles can be replaced during tundish casting, so tundish service is prolonged and casting efficiency is improved.

     

    Regular metering nozzle inner core physiochemical indexes

    Item RS-DSK-1 RS-DSK-2 RS-DSK-3 RS-DSK-4 RS-DSK-5 RS-DSK-6
    ZrO2+HfO2 ≥ 64 69 79 89 93 94
    Bulk density g/cm3 ≥ 3.6 3.7 3.9 4.2 4.3 4.3
    Apparent porosity %≤ 23 23 23 23 21 21
    Crushing strength Mpa ≥ 80 80 80 80 100 100
    Refractoriness ℃ > 1790 1790 1790 1790 1790 1790

     

  • Monoblock Stopper

    Nowadays, alumina carbon monoblock stoppers are most often used, gas blowing holes or porous plug is inserted at end part of monoblock stopper. During casting, argon is blew into stopper hole, and then enters into submerged nozzle. Argon enters into steel liquid in the form of small and scattered bubbles, it can decrease the amount of agglomerated Al2O3, so it won’t deposit in subentry nozzle. To prolong the life span of monoblock stopper, end part should be made from zirconia based refractory.

    Monoblock stopper physiochemical indexes

    Item RS-SB-A RS-SB-B RS-SB-C RS-SB-D
    Body End Body End Body End Body End
    Al2O3 % ≥ 45 65 45 / 45 50 45 /
    MgO %≥ / / / / / 15 / 60
    Al2O3+MgO % / / / ≥ 65 / / / /
    SiO2 % ≤10 / ≤10 / ≤20 ≤5 ≤20 /
    C+SiC % ≥ 20 10 20 10 25 ≤20 25 ≤20
    Crushing strength Mpa ≥ 20 22 20 22 22 20 22 15
    Cold modulus of rupture Mpa ≥ 6 6 6 6 6 10 6 5
    Apparent porosity % ≤ 19 18 19 18 20 17 20 19
    Thermal shock resistance(watering cooling, 1100℃) /times 5 5 5 5

    RS Group has rich experience in monoblock stoppers production. Alumina carbon stoppers and magnesia carbon stoppers are most often used for the casting of various kinds of steel, such as bloom, billet, rectangular bloom, round billet, bloom slab, sheet billet and so on.