Abstract
The article presents the results of the research on the influence of heat treatment conditions on corrosion resistance of newly developed HSLA-type (High Strength Low Alloy) steel in selected corrosive environments. Laboratory tests were carried out with using a salt spray chamber, enabling the continuous spraying of brine mist (5% NaCl) during 96 h under high humidity conditions. Additionally, as part of corrosion experiments, tests were carried out using the gravimetric method, in which the intensity of corrosive processes was measured by the linear corrosion rate. The research conducted revealed that the best corrosion resistance was noted for steel with a high-temperature tempered martensite microstructure. Investigated 0.28C–1.4Mn–0.3Si–0.26Cr steel with Nb, Ti, and V microadditions can be used in offshore drilling constructions and production platforms exposed to salts present in sea water, chlorides, sulfates, carbonates, and bromides, among others.
Highlights
Conditions on Corrosion ResistanceThe problem concerning the durability of metallic materials in natural and artificial environments is exceptionally important during both the design stage and operation of constructions and devices
Similar issues concerning corrosion resistance of HSLA-type steels were the subject of research with the results presented in [22,23,24,25,26,27]
Normalizing done at the temperature of 900 ◦ C, with subsequent open air cooling, resulted in the formation of a fine-grained, band-like ferritic-pearlitic microstructure (Figure 2b)
Summary
Conditions on Corrosion ResistanceThe problem concerning the durability of metallic materials in natural and artificial environments is exceptionally important during both the design stage and operation of constructions and devices. Corrosion damage results in continuous reduction of the effective cross-section of constructions, parts of machines and devices, and decreasing the strength and performance properties over the time of their operation, with a simultaneous increase in stress without the load change [1,2,3]. This creates the necessity to periodically replace corrosion-damaged parts, often subjected to other wear mechanisms, causing weakening of operational values, and leading to unexpected failures, often hazardous to the environment [4,5,6,7,8]. The HSLA-type steels, usually containing up to about 0.2% C and about 1.5% Mn as well as microadditions with high chemical affinity for carbon and nitrogen (Nb, Ti, and V up to 0.1%), sometimes with increased concentration of
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