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(1)淬透性低。一般情況下，碳鋼水淬的大淬透直徑只有10mm-20mm。
(1) low hardenability. Under normal circumstances, the quenching temperature of carbon steel is only 10mm-20mm.
(2)強度和屈強比較低。如普通碳鋼Q235鋼的σs為235MPa，而低合金結構鋼16Mn的σs則為360MPa以上。40鋼的σs/σb僅為0.43,遠低于合金鋼。
(2) strength and yield strength are relatively low. Such as ordinary carbon steel Q235 steel. S is 235MPa, and low alloy structural steel 16Mn is above 360MPa. S. 40 sigma Sigma s/ steel B was only 0.43, far lower than that of alloy steel.
(3)回火穩定性差。由于回火穩定性差，碳鋼在進行調質處理時，為了保證較高的強度需采用較低的回火溫度，這樣鋼的韌性就偏低；為了保證較好的韌性，采用高的回火溫度時強度又偏低，所以碳鋼的綜合機械性能水平不高。
(3) poor tempering stability. Due to poor stability of carbon steel in tempering, quenching and tempering treatment, in order to ensure the high strength with the tempering temperature is lower, so the toughness of the steel is lower; in order to ensure good toughness, with high tempering temperature strength and low carbon steel, so the comprehensive mechanical performance level is not high.
(4)不能滿足特殊性能的要求。碳鋼在抗氧化、耐蝕、耐熱、耐低溫、耐磨損以及特殊電磁性等方面往往較差，不能滿足特殊使用性能的需求。
(4) can not meet the requirements of special performance. Carbon steels are often poor in oxidation resistance, corrosion resistance, heat resistance, low temperature resistance, wear resistance and special electromagnetic properties, which can not meet the needs of special service performance.