Concerning empirical equations to predict corrosion resistance of high nitrogen stainless steels for heat exchangers

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:78279

Rondelli, G; Vicentini, B ^[1]; Cigada, A ^[2]

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1. Consiglio Nazionale delle Ricerche, Milan (Italy). Ist. Tecnologia Materiali
2. Politecnico di Milano, Milan (Italy). Dipt. di Chimica Fisica Applicata

Localized corrosion tests in substitute ocean water at 40 C and 70 C and in 6% FeCl{sub 3} were performed on four classes of stainless steels: Ni-austenitic (traditional and with high nitrogen content); Mn-austenitic nickel free; Duplex (traditional and with high nitrogen content) and ELI ferritic. The highest localized corrosion resistance was exhibited by high nitrogen stainless steels (type Ni-austenitic and Duplex). The negative effect of manganese led to fair performances of Mn-austenitic nickel free stainless steels, in spite of their very high nitrogen content (up to 1%). A modified Herbsled`s formula of Pitting Resistance Equivalent (PRE = %Cr+3.3%Mo+30%N-1.0%Mn), that takes into account the negative effect of Mn was proved to give better linear fit with experimental results than other literature formulas.

• OSTI ID: 78279
• Report Number(s): CONF-941007--; ISBN 0-7918-1381-9
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
CORROSION RESISTANCE
FORECASTING
HEAT EXCHANGERS
STAINLESS STEELS
THERMAL POWER PLANTS
VAPOR CONDENSERS