Containing magnesite, magnesia in the form of periclase, dolomite including in the form of dolime, or chromite
Articles of stone or of other mineral substances (including carbon fibers, articles of carbon fibers 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
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Subheadings
Products classified under HTS 6815.91.00
Magnesite Refractory Bricks
High-temperature resistant bricks primarily composed of magnesite, used in lining industrial furnaces and kilns. They fall under HTS 6815.91.00 due to their magnesite content and classification as articles of mineral substances not elsewhere specified. These bricks provide thermal insulation and corrosion resistance in steelmaking and glass production.
Dolomite Ramming Mass for Induction Furnaces
Dead-burned dolomite powder mixed for ramming into furnace linings, containing dolime for high-heat applications. Falls under HTS 6815.91.00 as an article containing dolomite in dolime form. Used in steel foundries for lining induction furnaces.
Magnesia Chrome Refractory Shapes
Preformed refractory blocks combining magnesia and chromite for rotary kilns in cement production. HTS 6815.91.00 applies due to dual magnesite and chromite composition. Offers superior resistance to chemical attack and thermal shock.
Dolime-Based Heat Insulation Boards
Rigid insulation panels made from dolime aggregates for high-temperature industrial ovens. Falls under HTS 6815.91.00 for dolomite/dolime content in fabricated form. Lightweight alternative to fiber insulation in petrochemical plants.
Periclase Furnace Roof Tiles
Curved magnesia tiles for electric arc furnace roofs in steel production. Classified HTS 6815.91.00 for periclase magnesia composition as mineral articles. Designed for extreme temperatures above 1700°C.
Magnesite Ladle Nozzle Inserts
Replaceable inserts for steel ladle nozzles made from dense magnesite. HTS 6815.91.00 for magnesite-based mineral articles used in continuous casting. Ensures controlled molten steel flow.
Chromite Investment Casting Shells
Pre-made ceramic shells with chromite flour stucco for precision investment casting. Under HTS 6815.91.00 for chromite content in foundry articles. Used for aerospace and turbine blade production.
Dolomite Stopper Rods for Steel Teeming
Refractory stopper rods with dolime heads for controlling ladle steel flow. HTS 6815.91.00 classification for dolomite-containing mineral articles. Essential for secondary steel refining.
Magnesia Carbon Brick Inserts
Magnesia matrix inserts with carbon additives for BOF vessel linings. Classified HTS 6815.91.00 for primary magnesite content despite carbon. Used in basic oxygen furnace steelmaking.
Periclase Tundish Well Blocks
High-purity periclase blocks forming tundish well nozzles in continuous casting. HTS 6815.91.00 for magnesia periclase articles. Critical for clean steel production.
Chromite Mullite Composite Refractories
Composite shapes blending chromite and mullite for glass tank regenerator checkerwork. Under HTS 6815.91.00 primarily for chromite component. High thermal cycling resistance.
Dolime Flux Additive Pellets
Pelletized dolime for electric furnace slag conditioning and phosphorus removal. HTS 6815.91.00 as fabricated dolomite articles. Improves steel desulfurization efficiency.
Magnesia Chrome Taphole Clay
Pasty magnesia-chromite clay for sealing blast furnace tap-holes. Classified HTS 6815.91.00 for specified mineral content in semi-fabricated form. Rammed in place for iron tapping.
Periclase Crucible for Metallurgy
Laboratory-grade crucibles made from fused magnesia (periclase) for melting precious metals and alloys. Classified under HTS 6815.91.00 for containing magnesia in periclase form as an article of mineral substances. Ideal for high-purity casting in jewelry and electronics manufacturing.
Chromite Sand for Metal Casting Molds
Foundry-grade chromite sand used as mold facing material in metal casting processes. Classified under HTS 6815.91.00 for chromite content as a mineral substance article. Provides high thermal stability for precision iron and steel castings.