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Development of a new high interstitial non-magnetic stainless steel for oil and gas applications

High nitrogen FeCrMn -austenitic stainless steels are used in oil and gas applications such as non-magnetic drill collars, Measuring While Drilling (MWD), and Logging While Drilling (LWD) housings. These steels are characterized by a good combination of high strength and high corrosion resistance in aggressive environments. This paper presents some results of a newly developed non-magnetic high interstitial (FeCrMnMo(C+N)) austenitic stainless steel which shows high strength, toughness, and enhanced corrosion properties. Characterization of microstructure, mechanical and corrosion properties was performed. After solution annealing at 1125 °C, the new 18Cr-18Mn-2Mo-1(C+N) is fully austenitic without precipitates or δ-ferrite. The newly developed stainless steel is characterized by an elongation higher than 60 %, a yield and ultimate strength of 600 MPa and 980 MPa, respectively, combined with high impact energy (≥ 350 J). Pitting resistance equivalent number (PREN) is > 35. The high-interstitial (HI) steel shows no intergranular corrosion without sensitization treatment (ASTM A262) and no weight loss in ferric chloride solution testing at room temperature for 72 hours (ASTM G48 Method A). The critical pitting temperature tested in acidified ferric chloride is 35 °C (ASTM G48 Method E). The new high interstitial FeCrMn austenitic stainless steel is a very promising grade for applications in the oil and gas industry due to the high mechanical strength above 1000 MPa combined with good corrosion properties. 

Product Number: 51320-14552-SG
Author: Clara Herrera, Philipp Niederhofer, Merlin Seifert
Publication Date: 2020
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