The effect of tempering temperature on pitting corrosion resistance of 420 stainless steels

Abstract

Influence of high temperature on corrosion behavior of 304 stainless steel in chloride solutions AIP Advances 6, 115301 (2016) , Efendi Mabruri Abstract. The AISI Type 420 stainless steels are commonly used to steam generators, mixer blades, etc. These stainless steels are most prone to pitting in dissolved Cl -containing environments. In this paper, the effect of tempering temperature on pitting corrosion resistance of AISI Type 420 stainless steels was studied. The AISI Type 420 stainless steels specimens were heat treated at the temperature of 1050°C for 1 hour to reach austenite stabilization and then quench in the oil. After that, the specimens were tempered at the temperature of 150, 250, 350 and 450°C for 30 minutes and then air cooled to the room temperature. The electrochemical potentiodynamic polarization test was conducted at 3.5% sodium chloride solution to evaluate corrosion rate and pitting corrosion behaviour. The Scanning Electron Microscope (SEM), Energy Dispersive X-Ray Spectroscopy (EDS) were used to evaluate the pitting corrosion product. The result have shown that highest pitting potential was found in the sample tempered at 250°C and corrosion pits were found to initiate preferentially around chromium carbides.

Influence of Temperature on Corrosion Behavior of 2A02 Al Alloy in Marine Atmospheric Environments

“…High temperatures hinder the formation of water films [34,36], in which case the electrochemical reaction is unlikely to initiate and progress. At the same time, temperature also influences the rates and mechanisms of electrochemical reactions [37,38,39]. Han and Li [35] observed that the weight gain and maximum pitting depth of LY12 Al in 1 mg/100 cm 2 Cl − increased with rising temperature.…”

CHARACTERISTICS OF AISI 420 STAINLESS STEEL MODIFIED BY COMBINING GAS NITRIDING AND CrN COATING

“…Stainless steel plays an increasingly important role in industries due to its corrosion resistance, hygienic properties, aesthetic appeal, etc. Currently, stainless steel is being studied in diverse directions like metallurgy [1][2][3][4], heat treatment [5][6][7][8][9][10], thermochemical treatment [11][12][13][14][15][16][17][18] and coating technologies [19,20]. Martensitic stainless steels like 410, 420, 440A grade are widely used as moulds for plastic injection and glass moulding, cutting tools, structural parts, automotive components, surgical and dental instruments, where high strength, wear and corrosion resistance are required [11,12].…”

“…Austenitization temperature of this steel grade at 1000÷1040 °C gave an optimum percentage of carbide distribution in the matrix which resulted in increasing the hardness and corrosion resistance [8,12]. For application required only heat treatment, tempering temperature should be chosen below 370 o C to ensure the corrosion resistance [9]. Kerl-Erick Thelning [21] recommended that martensite stailess steel should be nitrided in the temperature interval from 520 o C to 550 o C, while austenite stailness steel should be nitrided from 570 o C to 620 o C. On the other hand, at this temperature nitriding process generates the chrome nitride CrN and the chromium content was decreased as result, thus corrrosion resistance was also decreased.…”