Taking this into account care must be taken when putting '"a new--=kettle into service on which the protectiVe zinc-iron alloy layeris not yet present. The heating up phase is very critical, because high stresses can develop especially when high differential temperatures are present.A new kettle should be filled with zinc without lead so. that the protective zinc-iron alloy layer can be formed. Lead should be added afterwards. The critical temperature whereby LMC comes into being is raised without lead from 328 deg .c (the melting point of lead) to 420 deg C.LMC can only be formed when cracks are present in the steel, which are soon closed by the rapid formation of the zinc-iron alloy layer by the liquid zinc at 420 deg C, so that no intercrystalline cracks can be formed.Program to translate the sentence. English translation of the Thai, as both pages.
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