The Effect of Elements on High-Temperature Tempering Embrittlement in 3PE Anti-Corrosion Steel Pipes
Release time:
2021-03-30
Impurity elements such as phosphorus, tin, and antimony, which induce high-temperature temper embrittlement in 3PE anti-corrosion steel pipes, can promote or retard this phenomenon to varying degrees and in different forms. Alloying elements like chromium, manganese, nickel, and silicon have a promoting effect, whereas elements such as molybdenum, tungsten, and titanium exert a retarding effect.
3PE anti-corrosion steel pipe Impurity elements such as phosphorus, tin, and antimony, which induce high-temperature temper embrittlement in 3PE anti-corrosion steel pipes, promote or retard this phenomenon to varying degrees and in different forms. Alloying elements like chromium, manganese, nickel, and silicon have a promoting effect, whereas elements such as molybdenum, tungsten, and titanium exert a retarding effect.
Anti-corrosion steel pipes are steel pipelines that have undergone special anti-corrosion treatment, enabling them to effectively prevent or slow down corrosion—whether chemical or electrochemical—in the course of transportation and use. According to Chinese statistical data, annual direct economic losses due to steel pipe corrosion in China exceed 280 billion yuan. Globally, current annual losses caused by steel pipe corrosion amount to as much as 500 billion U.S. dollars. Anti-corrosion steel pipes can effectively prevent or slow down corrosion, thereby extending the service life of steel pipes and reducing their operational costs.
Carbon also plays a promoting role; generally, precision bright carbon tubes are not sensitive to high-temperature tempering embrittlement. However, binary or multi-component alloy steels containing chromium, manganese, nickel, and silicon are highly sensitive, with the degree of sensitivity varying depending on the type and content of alloying elements. The underlying cause of high-temperature tempering embrittlement in 3PE anti-corrosion steel pipes is widely believed to be the segregation of impurity elements such as phosphorus, tin, and antimony at the original austenite grain boundaries, leading to embrittlement at these boundaries.
Meanwhile, alloying elements such as manganese, nickel, and chromium tend to exhibit co-segregation with the aforementioned impurity elements at grain boundaries, thereby promoting the enrichment of impurities and exacerbating embrittlement. In contrast, molybdenum exhibits a strong interaction with impurity elements like phosphorus; it can induce the formation of precipitate phases within the grains and inhibit the segregation of phosphorus at grain boundaries, thus alleviating high-temperature temper embrittlement. Rare-earth elements also display a similar effect to molybdenum. Moreover, titanium is even more effective in promoting the precipitation of impurity elements such as phosphorus within the grains, thereby reducing the segregation of these impurities at grain boundaries and mitigating high-temperature temper embrittlement.
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