Application limits and sensitisation behaviour of the manganese‐ and nitrogen‐alloyed austenitic stainless steel P2000 (X13CrMnMoN18‐14‐3)

Abstract

Nickel‐free high‐nitrogen‐alloyed stainless steels like the P2000 (X13CrMnMoN18‐14‐3) were developed to enhance the strength and corrosion resistance of austenitic stainless steels like 304 and 316 while keeping the typical high ductility. The mechanical and corrosive properties of P2000 were investigated and compared with 304 and 316 to highlight the application opportunities of this new alloy. The microstructure of the solution‐annealed condition was characterised by electron backscatter diffraction and the mechanical properties were studied by uniaxial tensile tests, Charpy impact tests and hardness measurements. The passivation behaviour was analysed using the electrochemical potentiodynamic reactivation, whereas the pitting corrosion resistance was compared by pitting potentials and pitting temperatures. However, secondary thermal influences or suboptimal heat treatment can impair the corrosion resistance due to the precipitation of secondary phases and the resulting sensitisation. Thermodynamic calculations and artificial ageing treatment in the range of 500–900°C for up to 100 h were used to determine critical time–temperature parameters for sensitisation. The microstructure of the various aged states was evaluated by scanning electron microscopy and compared with the degrading corrosion resistance characterised by the KorroPad method.

Precipitation Behavior of the Second Phase in High-Nitrogen Austenitic Stainless Steel Alloyed with V and Nb

“…Owing to the above advantages, in recent years, it has been widely used in various fields such as machinery, chemical industry, energy and electricity, biomedicine and jewelry [2][3][4] and is also a potential candidate in the manufacturing of armor [5]. P900 (18Cr-18Mn-0.6N), P900-N (18Cr-18Mn-0.9N) [6] and P2000 (16Cr-14Mn-3Mo-0.9N) [7] steels are the typical industrially used high-nitrogen austenitic stainless steel employed in the manufacturing of large generator guard rings [8]. Due to the high content of alloying elements in this type of steel, it is extremely easy to precipitate a large amount of the second phase during the forming process of a material (high-temperature pressure processing, welding, etc.)…”

DL‐EPR and AFM study of sensitization of a 17%Cr multiphase stainless steel

“…Among the most used electrochemistry techniques are linear sweep voltammetry [23][24][25][26] and the classical doubleloop electrochemical potentiodynamic reactivation (DL-EPR). [20][21][22][27][28][29][30][31][32] The degree of sensitization (DOS) obtained in this test is a measure of Cr-depleted areas.…”