Tom qab U khoov (txias txoj kev), kev kho cua sov ntawm qhov khoov yuav tsum tau.nitrogen generating tshuab (los tiv thaiv stainless hlau raj nto thaum lub sij hawm annealing).Kub yog tswj los ntawm tag nrho cov tshav kub-kho cheeb tsam los ntawm tsau thiab portable infrared pyrometers.