这种铸件通常为外径处晶粒非常细小的细晶粒铸件，能耐大气腐蚀，典型的情况是管子。
The casting is usually a fine grain casting with a very fine-grained outer diameter, which is resistant to atmospheric corrosion, a typical situation with pipes.
结果显示，烟气流经换热器内部，在管子弯头处较直管段处容易出现低温腐蚀。
The result shows that when flue gas flow through the heat exchanger, the elbow part of pipe is easier to suffer low temperature corrosion than the straight part.
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