Structure and Mechanical Properties of Maraging and Low-Carbon Martensitic Steels

The structure, mechanical properties, and crack resistance after tempering of maraging steel 03Kh11N10M2T (EP-678) and low-carbon martensitic steel 12Kh2G2NMFT are studied. The range of tempering temperatures ensuring the combination of properties required for massive parts (_r #x2265; 1300 MPa, _0.2 1100 MPa, KCT 0.2 MJ/m²) is determined. It is shown that steel 12Kh2G2NMFT is better adaptable to manufacture because it is hardened by air-cooling.__________Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 1, pp. 32 – 35, January, 2005.