The corrosion resistance of tubing pipes of four strength groups is evaluated: E, Λ, K and D by measuring the saturation current density of steel anodic dissolution. It is shown that tubing of increased strength (groups E and Λ) has lower corrosion resistance compared with pipes of strength groups D and K. The low corrosion resistance of tubing of strength groups E and Λ is associated with the formation of adverse structural components, in particular high-carbon martensite having a high dislocation density. Formation of this structure is due to the fast cooling rate of the pipes in sprayer equipment. In order to increase the corrosion resistance of tubing of strength groups E and Λ it is recommended that additional heat treatment consisting in particular of quenching and tempering is performed in order to relieve internal stresses within the steel.

中文翻译：

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各种强度组油管的耐腐蚀性评价

通过测量钢阳极溶解的饱和电流密度，对E、Λ、K、D四个强度组的油管的耐腐蚀性能进行了评价。结果表明，与强度组 D 和 K 的管相比，强度增加的管（E 组和 Λ）具有较低的耐腐蚀性。强度组 E 和 Λ 的管的低耐腐蚀性与不利结构部件的形成有关，特别是具有高位错密度的高碳马氏体。这种结构的形成是由于喷雾器设备中管道的快速冷却速度。为了提高强度组为 E 和 Λ 的管材的耐腐蚀性，建议进行额外的热处理，特别是淬火和回火，以减轻钢内的内应力。