Other
Articles of stone or of other mineral substances (including carbon fibres, articles of carbon fibres and articles of peat), not elsewhere specified or included. > Other articles: > Containing magnesite, magnesia in the form of periclase, dolomite including in the form of dolime, or chromite > Other > Other
Duty Rate (from China)
Subheadings
Products classified under Tariff item 6815.91
Chromite Investment Casting Shells
Pre-formed ceramic shells using chromite flour as a stucco material, designed for precision investment casting of aerospace and turbine components. The chromite content qualifies these shells as articles of mineral substances under this tariff item, which covers other articles containing chromite.
6815.91.90Chromite-Magnesite Roofing Granules
Colored granules containing chromite and magnesite applied to asphalt shingles for UV protection and aesthetics. They are classified under 6815.91.90 as other articles containing magnesite or chromite, not excluded by Chapter 68 notes.
6815.91.90Chromite Mullite Composite Refractories
Composite refractory shapes blending chromite and mullite, used in glass tank regenerator checkerwork. The chromite component places these under this tariff item as other articles containing chromite, offering high thermal cycling resistance.
6815.91.90Chromite Sand for Metal Casting Molds
Foundry-grade chromite sand used as a mold facing material in metal casting processes. As a fabricated mineral substance article containing chromite, it falls under this tariff item, providing high thermal stability for precision iron and steel castings.
6815.91.90Dead Burned Magnesite Balls for Sintering
Spherical dead burned magnesite aggregates used as sintering aids in refractory brick production. They are classified under 6815.91.90 as magnesia-containing articles for manufacturing processes, with high density promoting uniform brick formation.
6815.91.90Dolime-Based Heat Insulation Boards
Rigid insulation panels made from dolime aggregates for high-temperature industrial ovens. As fabricated articles containing dolime, they fall under this tariff item, offering a lightweight alternative to fiber insulation in petrochemical applications.
6815.91.90Dolime Flux Additive Pellets
Pelletized dolime flux additives used for electric furnace slag conditioning and phosphorus removal in steelmaking. These fabricated dolomite articles contain dolime and fall under this tariff item as other articles containing dolomite in dolime form.
6815.91.90Dolomite Ladle Nozzle Inserts
Disposable dolomite inserts for steel ladle nozzles to control molten steel flow and prevent clogging. They are classified under 6815.91.90 as dolomite-containing articles for metallurgical use, excluding tool parts of Chapter 82.
6815.91.90Dolomite Powder for Rubber Filler
Micronized dolomite powder used as reinforcing filler in rubber compounds for tires and belts. It is classified under 6815.91.90 due to dolime content and status as a processed mineral article excluded from Chapter 25.
6815.91.90Dolomite Ramming Mass for Induction Furnaces
Dead-burned dolomite powder mixed for ramming into furnace linings, containing dolime for high-heat applications. This article containing dolomite in dolime form falls under this tariff item, used in steel foundries for ladle and furnace maintenance.
6815.91.90Dolomite Refractory Brick for Cement Kilns
Fired bricks composed mainly of dolime (calcined dolomite) designed for lining rotary cement kilns. They are classified under 6815.91.90 as they contain dolomite and qualify as other articles of mineral substances, not excluded by Chapter 68 notes.
6815.91.90Dolomite Stopper Rods for Steel Teeming
Refractory stopper rods with dolime heads for controlling ladle steel flow in secondary steel refining. These dolomite-containing mineral articles fall under this tariff item, essential for precise steel teeming operations.
6815.91.90Magnesia Carbon Brick Inserts
Magnesia matrix inserts with carbon additives for BOF vessel linings. Despite the carbon content, the primary magnesite composition places these under this tariff item as other articles containing magnesite, used in basic oxygen furnace steelmaking.
6815.91.90Magnesia-Carbon Ladle Nozzle Insert
A magnesia-carbon refractory insert designed for steel ladle nozzles, containing over 70% magnesia and 10-25% carbon, resin-bonded for erosion resistance during molten steel pouring. It provides directional flow control in continuous casting operations and is classified under tariff item 6815.91.90 as an other article of mineral substances containing magnesia.
6815.91.90Magnesia-Carbon Submerged Entry Nozzle Tip
A replaceable tip for submerged entry nozzles in continuous billet casting, containing over 70% MgO with 22% carbon, pitch-resin bonded for molten steel protection. It prevents clogging and ensures meniscus stability, and is classified under 6815.91.90 as an other article containing magnesia.
6815.91.90Magnesia Ceramic Kiln Furniture Set
A set of magnesia shelves, props, and saggers used to support ceramics during firing in kilns. It is classified under 6815.91.90 because it contains periclase magnesia and functions as mineral articles not excluded by Chapter 68 notes.
6815.91.90Magnesia Chrome Refractory Shapes
Preformed refractory blocks combining magnesia and chromite for rotary kilns in cement production. The dual magnesite and chromite composition places these under this tariff item, offering superior resistance to chemical attack and thermal stress.
6815.91.90Magnesia Chrome Taphole Clay
Pasty magnesia-chromite clay for sealing blast furnace tap-holes, rammed in place for iron tapping. This semi-fabricated article containing magnesite and chromite falls under this tariff item as other articles of specified mineral substances.
6815.91.90Magnesia Ramming Mix for Steel Ladles
A dry granular magnesia-based material rammed into place to line steel ladles, containing periclase form of magnesia. It is classified under 6815.91.90 as an other article of specified mineral substances, used in steelmaking for lining applications.
6815.91.90Magnesite Crucible for Metal Melting
A high-temperature resistant crucible made primarily from magnesite, used in foundries for melting non-ferrous metals. It is classified under 6815.91.90 because it contains magnesite as the key mineral substance and is not excluded by Chapter 68 notes.
6815.91.90Magnesite Ladle Nozzle Inserts
Replaceable inserts for steel ladle nozzles made from dense magnesite, used in continuous casting. These magnesite-based mineral articles fall under this tariff item, ensuring controlled molten steel flow.
6815.91.90Magnesite Refractory Bricks
High-temperature resistant bricks primarily composed of magnesite, used in lining industrial furnaces and kilns. They fall under this tariff item as articles of mineral substances containing magnesite, not elsewhere specified.
6815.91.90Periclase Crucible for Metallurgy
Laboratory-grade crucibles made from fused magnesia (periclase) for melting precious metals and alloys. These articles containing magnesia in periclase form fall under this tariff item as other articles of mineral substances.
6815.91.90Periclase Furnace Roof Tiles
Curved magnesia tiles for electric arc furnace roofs in steel production, designed for extreme temperatures above 1700°C. These periclase magnesia articles fall under this tariff item as other articles containing magnesia in periclase form.
6815.91.90Periclase Grain for Refractory Guniting
Periclase grain for refractory guniting consists of coarse magnesia (periclase) grains mixed with binders, designed for pneumatic application to repair furnace linings. This product is classified under tariff item 6815.91.90 as it is an article of mineral substances containing magnesia in the form of periclase, not elsewhere specified. It is used for industrial hot-repair applications in metallurgical furnaces, falling within the scope of Chapter 68.
6815.91.90Periclase Tundish Well Blocks
High-purity periclase blocks forming tundish well nozzles in continuous casting, critical for clean steel production. These magnesia periclase articles fall under this tariff item as other articles containing magnesia in periclase form.
6815.91.90Phenolic Resin Magnesia-Carbon Well Block
A refractory well block for ladle slide gate assemblies, containing 78% magnesia, 18% carbon via flake graphite, bonded with phenolic resin. It forms a stable seating for nozzles in steel pouring systems and is classified under 6815.91.90 as an other article containing magnesia.
6815.91.90Pitch-Bonded Magnesia-Carbon Slide Gate Plate
A refractory slide gate plate for steel ladles, featuring over 75% magnesia, 15% graphite carbon, and pitch chemical bonding for high-temperature steel flow control. It enables precise molten metal regulation in secondary metallurgy and is classified under 6815.91.90 as an other article containing magnesia.
6815.91.90Resin-Bonded Magnesia-Carbon Refractory Brick
A high-performance refractory brick composed of over 70% magnesia (MgO) with carbon content under 30%, chemically bonded using phenolic resin or pitch. It is used primarily in steel ladle linings for superior slag resistance and is classified under 6815.91.90 as an other article containing magnesia.
6815.91.90Resin-Bonded Magnesia-Graphite Purging Plug
A bottom-purging refractory plug for steel ladles, with 72% MgO, 20% graphite, resin-bonded for argon injection and steel homogenization. It withstands extreme thermal cycling and corrosion and is classified under 6815.91.90 as an other article containing magnesia.
6815.91.90Resin-Bonded Magnesia Ladle Impact Pad
A refractory impact pad for steel ladle bottoms, containing 74% magnesia with 12% carbon, chemically bonded by resin to absorb molten steel stream impact. It protects the ladle shell from erosion during filling and is classified under 6815.91.90 as an other article containing magnesia.