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LOCAL STRESS RELIEVING (LSR) /
NORMALISING / ANNEALING
Using an external firing method, large vessel seam areas are subjected to a Localised Stress Relieving (LSR) process, by applying heat under controlled conditions using the HAL High Velocity Fuel Fired Burners, inserted through suitable openings in the temporary furnace.
Normalising aims to give the steel a uniform and fine-grained structure.
The process is used to obtain a predictable microstructure and an assurance of the steel's mechanical properties.
Annealing is a heat treatment process applied to a material to increase its ductility and reduce its hardness by altering its physical, and sometimes chemical properties.
The steps involve heating a material above its recrystallisation temperature, maintaining a stable and suitable temperature for a certain amount of time, and then cooling it.
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