Refractory Creep Under Load Calculator
High-temperature materials & furnace design: Calculate compressive creep subsidence rate (dε/dt), Refractoriness Under Load (RUL), Norton-Bailey power law strain, and lining life.
Furnace Refractory & Stress Regime
Creep Subsidence & Furnace Integrity
Recommended Tools & Equipment
Tested hardware and components for high reliability
Frequently Asked Questions
What is Refractoriness Under Load (RUL) in refractory engineering?
Refractoriness Under Load (ISO 1893) measures the capability of a refractory product to withstand a constant compressive load (typically 0.20 MPa or 28 psi) under progressively increasing temperature. Key indices include T_0 (temperature of initial expansion reversal), T_0.5 (temperature at 0.5% subsidence), and T_2 (2.0% subsidence).
Why does silica brick maintain rigidity almost up to its melting point?
Unlike fireclay or impure alumina refractories that contain glassy silicate grain boundary phases that soften gradually over a 300°C window, silica brick consists of an interlocking crystalline tridymite and cristobalite network. It maintains exceptional load-bearing rigidity up to ~1650°C before undergoing abrupt softening, making it the premier material for glass furnace crowns and coke ovens.
How does high-temperature creep lead to furnace lining failure?
Creep is time-dependent plastic strain occurring under sustained compressive stress and intense thermal exposure. In furnace roofs and tall vertical stacks, creep leads to crown sag, wedge opening of brick joints, ingress of corrosive process gases, and localized buckling of skewback support steel.