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HIGH STRENGTH, LOW ALLOY STEEL WITH IMPROVED SURFACE AND MECHANICAL PROPERTIES
HIGH STRENGTH, LOW ALLOY STEEL WITH IMPROVED SURFACE AND MECHANICAL PROPERTIES
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机译：具有改善的表面和力学性能的高强度，低合金钢
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ABSTRACT OF THE DISCLOSUREHigh strength, low alloy steel is produced,preferably as a hot rolled article (e.g. strip), to havea rimmed skin of essentially ferrite while having a mainbody or core which is aluminum-killed and comprises, forsuperior mechanical properties including yield strength,a suitable quantity of columbium and/or vanadium, Thecarbon, manganese and sulfur contents of the base metal,which provides the skin and plus the addition, the core,are preferably limited to provide special results as lowalloy steel and also, by the same limitations, to provideauto sulfide shape control and thus to avoid unwanteddirectionality regarding toughness and bendability. Thesteel is made by pouring a mold 80-95% full of the basecomposition, then allowing the steel to rim for severalminutes, and after a shell has solidified, continuing topour while adding Al and Cb or V to the teemed stream,thereby providing an ingot with the above killed core,which can be hot reduced as desired.
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