制定重要用途的大型零件的淬火规范,必须考虑在钢中引起的热应力(这种热应力可能导致裂纹).这是为各种因素所决定的,这些因素是:这些零件价值高;各种激冷方法被日益广泛地应用,而这些方法会引起温度和钢组织沿截面产生极为重要的不均匀性;零件中心区域强度低,相当于厚钢锭心部的强度. Quenching specifications for large parts used in important applications must take into account the thermal stress induced in the steel (this thermal stress can lead to cracks), which is determined by a variety of factors, such as the high value of these parts, Chilling methods are increasingly used, and these methods cause extremely significant inhomogeneities in temperature and steel microstructure along the cross-section; the strength of the central part of the part is low, which corresponds to the strength of the heart of a thick steel ingot.