大量粗片状珠光体的形成与吐丝前后的冷却速度过慢等因素有关。

Formation of large quantities of the flake perlite is closely dependent on the extremely low cooling rate before and after wire-drawing.

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一般地，片状珠光体的强度高于粒状珠光体、塑性低于球状珠光体。

In general, the strength of carbon steel containing lamellar pearlite is higher than that of carbon steel containing nodular pearlite, but the ductility of the former is lower than that of latter.

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而铌元素的加入增大了过冷奥氏体的稳定性，相变点温度降低，并且推迟珠光体的转变。

But Nb adding increases the under-heating austenite stability, reduces the temperature of phase transformation point and postpones the transformation of pearlite.

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