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稀土元素应用于低合金钢16Mn的厚度≥70mm钢板,显著脱硫和较彻底控制硫化物形态,使厚钢板的轧向、垂直轧向、厚度三个方向机械性能,尤其是塑性的异向性显著缩小.钢板厚度方向的断面收缩率ψ值达到40%以上,因而抗层状撕裂性能优越,利于大型焊接结构件的制造.钢板的低温冲击韧性显著改善,使-40℃低温梅氏冲击值大于10kgf·m/cm~2,冷脆转变温度降低至-60℃,增大了钢材的韧性贮备,提高了制件的工作可靠性.本文提出并初步讨论了稀土元素的上述作用.
Rare earth elements used in low alloy steel 16Mn thickness ≥ 70mm steel, significant desulfurization and more complete control of sulfide morphology, so that the rolling plate thickness, vertical rolling, the thickness of the three directions of mechanical properties, especially the plastic anisotropy significantly Reduce the thickness direction of the steel sheet section shrinkage ψ value of 40% or more, and thus anti-layered tear superior performance, which is conducive to the manufacture of large welded structural parts of the low temperature impact toughness of steel significantly improved so that -40 ℃ low temperature Mehs impact value When the temperature is above 10kgf · m / cm ~ 2, the cold brittle transition temperature is reduced to -60 ℃, which increases the toughness of the steel and improves the working reliability of the workpieces.The above mentioned actions of rare earth elements are proposed and discussed initially.