The effect of heat treatment on corrosion resistance of low-alloy pipe steels is investigated in relation to oilfield pipeline operating conditions. It is established that after pipe bulk heat treatment at 720 °C metal corrosion resistance increases, but at a lower temperature of 680 °C no significant change is detected. Analysis of the corresponding structural changes is performed and the main factors facilitating an increase in corrosion resistance are determined: cementite component spheroidization in the areas of pearlite or degenerated pearlite, and a reduction in dislocation density. The role of nanoscale precipitate type on pipe corrosion resistance is noted. It is established that at a higher processing temperature there is a larger fraction of ferritic precipitates. In contrast to interphase precipitates these particles do not adversely affect steel corrosion resistance.

中文翻译：

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管材加工阶段热处理对微合金钢热轧产品耐腐蚀性能的影响

结合油田管道运行条件，研究了热处理对低合金管钢耐腐蚀性能的影响。确定的是，在 720 °C 的管道整体热处理后，金属的耐腐蚀性能增加，但在 680 °C 的较低温度下没有检测到显着变化。对相应的结构变化进行分析，确定促进耐蚀性提高的主要因素：珠光体或退化珠光体区域的渗碳体成分球化，以及位错密度的降低。注意到纳米级沉淀类型对管道耐腐蚀性的作用。已经确定，在较高的加工温度下，会有较大比例的铁素体沉淀。