Which steel members can be made from unidentified steel according to the specifications?

The correct answer centers on the grading and identification of steel used in construction. Unidentified steel may be acceptable for non-critical applications, which typically includes what are termed "unimportant members." These members are those whose failure would not compromise the overall structural integrity of the building or a significant safety risk. Examples of unimportant members might include small non-load-bearing components or connections that do not carry significant loads.

In contrast, primary structural members and secondary structural members generally require identifiable steel specifications to ensure their strength and performance under loading conditions. The use of unidentified steel in critical structural applications could lead to unpredictable behavior under stress, creating potential safety issues. Therefore, it aligns with safety standards and engineering practices to restrict unidentified steel to non-essential components that do not play a critical role in the structure's overall performance.