Overheating can result in over tempered martensite ( OTM ) or untempered martensite ( UTM ) formations in the base metal .
过热会造成在本体金属中形成过回火马氏体（OTM）或者欠回火马氏体（UTM）。
The influence of heating temperature , forging-ending temperature and cooling speed on the mechanical properties of untempered 45V steel is investigated .
研究了加热温度、终锻温度、冷却速度对45V非调质钢力学性能的影响。
Application of untempered steel in construction machinery
非调质钢在工程机械上的应用
The heated temperature , the final forging temperature and the cooling speed are the important factors which influence the performance of untempered steel .
