Complex Characterization of a New Low Ni Maraging Steel with Enhance Service Stability

Abstract:

A new low Ni maraging steel, based on 18Ni (300) type has been developed. The optimized chemical composition (complex alloyed with Al-Si-Ti or Si-Zr-Nb) in accordance with optimum heat treatment was found (solution: 970 °C/1h/air and ageing: 550 °C/3h/air), in order to obtain maximum service temperature of over 600 0C and ensured the good combination of strength and toughness properties. The precipitates, such as Ni3(Mo, Ti), were well controlled in lath martensite (R_m=2090N/mm2 and Rp_0,2=1930N/mm²)and the presence of Si, Zr and Nb enhance structure stability at high temperature (for example the ultimate tensile strength at 5500C is about 1440N/mm²). Therefore, this new type of maraging steel was the subject of a national patent: “Maraging steel for high temperature service and heat treatment technology” – PATENT No.120356/30.08.2010.

• Periodical: Solid State Phenomena (Volume 188)
• Pages: 346-351
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.188.346
• Online since: May 2012
• Authors: Mihai Branzei, Ion Nedelcu, Marian Miculescu
• Keywords: Heat Service Stability, IMC, Low Ni, Stainless Maraging Steel

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