Korrosionsverhalten nichtrostender Vergütungsstähle mit rund 13% Chrom

Abstract

Mitteilung aus den Forschungsanstalten der Edelstahlwerke Gebr. Bohler C Co. Aktiengesellschaft Korrosionsverhalten nichtrostender Vergiitungsstzhle mit etwa 13 o/o C r Die hier vorliegende Untersuchung wurde im AnschluB an eine fruhere Arbeit von Biiumel und Carius (1) uber das Korrosionsverhalten von hartbaren nichtrostenden Messerstahlen durchgefuhrt. Diese bereits untersuchten Stahle unterscheiden sich von den nichtrostenden Vergiitungsstahlen im wesentlichen nur durch einen erhohten Kohlenstoff gehalt. Die Messerstahle haben Kohlenstoffgehalte von 0,4% und hoher, wahrend der Kohlenstoffgehalt der im verguteten Zustand eingesetzten nicht-AnlaOzeit min Abb. 4. Schematidm Vcrlauf der Chromvcrarmung bei isothermer AnlaBbchandlung Werkstoffe und Korrosion 1) Der Stahl lag als 2,5 mm szarkes Walzblech vor. 2) Der Stahl lag als gewalztes Flachmaterial von 5 . 40 mm2 vor. 18. Jahrgang Heft 411967 X 500 Abb. 7. Gefuge der untersuchten Stahle bei 500facher Vergrofierung Atzmittel: 50°/oige Adlerbeire Abb. 7a. X 1 5 C r M o 1 3 0,13 " ! a C ; 13,7 Olio Cr; 1,12 OIo Mo 15 min 980' (301; 25 "10 Ferrit X 500 Abb. 7b. X 2 0 C r 1 3 0,2 OIo C ; 12,85 O I o C r ; 0,06 OIo Mo 15 min 980' ClOl: 21 O/o Ferrit X 500 Abb. 7c. X 2 0 CrMo 13 0,22 O/o C; 14,O ' 1 0 C r ; 1,29 OIo Mo 15 min 980" C/O[: 23 O/o Ferrit Werkstoffe und Korrosion

Influence of austenitizing and tempering on the corrosion behavior and sensitization of martensitic stainless steel X50CrMoV15

“…Tempering induced chromium depletion was investigated in most studies dealing with martensitic stainless steels. Bäumel found that the precipitation of chromium carbides at tempering temperatures above 450 °C greatly reduces the corrosion resistance . These results support the theory of chromium depletion, which states that chromium is depleted from the surrounding metal matrix during the formation of chromium carbides .…”

Welding Metallurgy of Stainless Steels

“…By rapid cooling from temperatures above 900 0 C, the former become susceptible to corrosion but become resistant again after tempering in the range of 650-800 0 C. According to Baerlecken,Fischer and Lorenz [40], the intergranular corrosion attack behaviour is mainly influenced by carbon. The corrosion behaviour ofl3% chromium steels (AISI 410) has been tested by Baumel [227] in boiling 5% and 20% acetic acid, since the Strauss test is too aggressive for these steel grades. The carbon content above this threshold value will be precipitated as carbide, even in the case of rapid cooling.…”

“…The corrosion behaviour of these grades, with special consideration towards welding is discussed by Baumel [206,207,227] and by Honeycombe and Gooch [361]. The corrosion behaviour of these grades, with special consideration towards welding is discussed by Baumel [206,207,227] and by Honeycombe and Gooch [361].…”

“…-knife line corrosion in the 121 Heat resistant steels, welding of 227 Heat treatment of welds -from austenitic ferritic-dissimilar joints [235][236][237]239 -from austenitic-ferritic duplex steels [188][189][190]192 -from austenitic steels 199,201,202,206-211, 214, 221, 222 -from ferritic chromium steels 173, 175,-177 -from fully austenitic steels 221,222 -from low carbon martensitic steels 180,[183][184][185] -from stabilized austenitic steels 210,211,214 -from unstabilized austenitic steels 199,201,202,[206][207][208] Hot cracking resistance -influence of alloying elements 162 -influence of boron 44,45,162,166 -influence of carbon 165 -influence of delta ferrite content 88,[160][161][162]165 -influence of manganese 30,40,155,156,163,167,233...…”

Acid Corrosion in Wells (CO2, H2S): Metallurgical Aspects

“…5b) to all types of corrosion. 8,13,14 This shaded area can seriously encroach on the domain of the mechanical characteristics of the usual API Grade N 80, and fortuitously, the limit of the sensitization to corrosion may correspond to the same upper limit as that of the reduced-grade API L 80.…”