Engineering Calculators
Free calculators for the numbers that come up when specifying and buying refractories — no sign-up, nothing sent to a server.
Compare two refractory grades on what they actually cost per tonne of product, not on price per kilogram — the comparison that decides which supplier is cheaper.
Open calculator →Calculate apparent porosity, bulk density, water absorption and apparent specific gravity of a refractory by the Archimedes method, from dry, saturated and suspended weights.
Open calculator →Calculate binary and quaternary slag basicity from a slag analysis, and see whether the slag is acidic, neutral or basic — the first thing that decides which refractory lining will survive it.
Open calculator →Work out the mixing water for a refractory castable from the dry mass and the recommended water percentage, including water per 25 kg bag and the final wet mix mass.
Open calculator →Estimate how many bricks a cylindrical lining takes, from vessel diameter, lining height, lining thickness and brick dimensions, with a waste allowance.
Open calculator →Calculate the IIW carbon equivalent from a steel analysis and read off what it implies for weldability and preheat.
Open calculator →Convert a crushing load and specimen geometry into cold crushing strength in MPa and kg/cm², the standard room-temperature strength check for a refractory.
Open calculator →Work out the degree of metallisation of direct reduced iron from its metallic and total iron content, and see how the figure reads against normal EAF charge practice.
Open calculator →Estimate the volume, mass and order quantity of refractory for a rotary kiln section, plus the resulting inner diameter and hot-face area.
Open calculator →Size the expansion allowance for a refractory lining from the material, the cold length and the temperature rise — the joint that stops a lining pushing itself apart.
Open calculator →Convert between Celsius, Fahrenheit and Kelvin for furnace and thermal work. Type into any field and the other two follow immediately.
Open calculator →Calculate the steady-state heat flux through a refractory wall from its thermal conductivity, thickness and the temperature difference across it.
Open calculator →Work out how much a refractory run grows on heating, and the expansion joint needed to absorb it, from the coefficient of thermal expansion and the temperature rise.
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