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4. Metallurgical Issues4.1 INTRODUCTIONMany metallurgical issues are associated with steel construction. This chapter will focus on welding related metallurgical issues in steel construction.4.2 STEEL—PROPERTIES OF INTERESTVarious types of structural steel are classified, or graded,based on a variety of properties, but one primary property of interest to the engineer is the minimum specified yield strength. Some steel grades also have a maximum limit on the yield strength. Additionally, steel grades have minimum specified tensile strengths, or tensile strength ranges. Minimum levels of ductility, measured in terms of elongation, are also specified. Minimum notchtoughness levels, as measured in the Charpy V-notch test, generally are supplemental requirements that must be specified, if desired, when the steel is ordered
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