外加磁场改变了渗碳体片层的分叉形成过程，随磁通密度的增加，珠光体晶粒内部的渗碳体片层趋向于平行排列。

The bifurcation process of cementite flake is changed by magnetic field. The cementite flakes in pearlite grains tend to be parallel with the increase of magnetic flux density.

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认为，油管失效是由于微电池腐蚀造成的，腐蚀先在钢管外表面能构成电池回路的珠光体晶粒中进行，然后逐渐扩展到周围的晶粒。

Micro cell corrosion originally carried out in pearlites on the external surface of the pipe where micro cell circuit could be formed, and gradually developed and spreaded.

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使用状态的组织为细晶粒的铁素体—珠光体，强度比普通碳素结构钢Q235高约20%～30%，耐大气腐蚀性能高20%～38%。

Using the state of the organization for the fine grain ferrite pearlite, strength than ordinary carbon structural steel Q235 about 20% ~ 30%, high atmospheric corrosion resistance of 20% ~ 38%.

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