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本文指出,在钢中含硫量一定的情况下,随着 RE/S 值的提高,σ_b,σ_s 基本保持不变,而δ_5略有增加;钢中长条状 MnS 夹杂物逐渐减少,冷弯性能逐渐改善。当 RE/S<1时,长条状 MnS 夹杂物较多,冷弯不合;当 RE/S=1～2时,钢中仍有少量 MnS 夹杂,个别批次的冷弯仍不合格;当 RE/S≥3时,没有观察到 MnS 夹杂物,只有颗粒较小的复合稀土夹杂物,冷弯合格。最后指出,RE/S 值不宜过高,若 RE/S>7,钢中硬性稀土夹杂物数量增多,颗粒粗大,这样反而会恶化钢的塑性和韧性。
This paper points out that under the condition of certain sulfur content in steel, with the increase of RE / S value, σ_b, σ_s remain unchanged and δ_5 slightly increase; the inclusions of long strip MnS in steel gradually decrease, Performance gradually improved. When RE / S <1, there are more elongated MnS inclusions and cold bending. When RE / S = 1-2, there is still a small amount of MnS inclusions in the steel, and the cold bending of individual batches is still unqualified. When RE / S≥3, no MnS inclusions were observed, only the composite rare earth inclusions with smaller particles were qualified by cold bending. Finally, it is pointed out that the RE / S value should not be too high. If RE / S> 7, the amount of rare earth inclusions in the steel increases and the particles are coarse. In this case, the ductility and toughness of the steel deteriorate.