"The Secret of the K-Metal" was completed in late 1940 and would likely have been published that same year with a coverdate of early 1941.  This would have placed it directly after the events of Action Comics #31 and Superman #7.

These stories leading into the events of "The Secret of the K-Metal" are available in The Superman Chronicles, which reprints, in color, every Superman story in chronological order:

	Superman Chronicles Volume One Reprints Action Comics #1 through #12, New York World's Fair #1, Action Comics #13, and Superman #1; all originally published in 1938 and 1939.  By Jerry Siegel and Joe Shuster.
	Superman Chronicles Volume Two Tales from Action Comics #14 through #20 and Superman #2 and #3, from 1939 and 1940.  As with Volume One, all stories are by Superman co-creators Jerry Siegel and Joe Shuster.
	Superman Chronicles Volume Three Continues reprinting Superman's adventures in chronological order from where Volume Two left off in 1940.

— QUICK TIMELINE & STORY NAME —     READ THE COMIC BOOK! THE MOST IMPORTANT SUPERMAN STORY EVER WRITTEN! SIXTY-FIVE YEARS IN THE MAKING! ORIGINAL ARTWORK CREDITS THE RADIO SHOW VARIANT COVERS Reconstruction Credits Bonus Material K-Metal Forum Original Art Wanted About the Creative Team ARCHIVES/BLOG    — Temporarily known as "The K-Metal from Krypton" —

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