From http://www.boeing.com/history/boeing/b50.html
B-50 Bomber
[. . .] The B-50 evolved from the B-29D, but because it included so many improvements, it was redesignated the B-50A, with 59 percent more power than the B-29. [. . .] Sixty B-50As were ordered by the U.S. Army Air Forces before the end of World War II, and delivery began in 1947. In all 79 B-50As were built. The next version, the B-50B, was heavier, with a gross weight of 170,000 pounds. [. . .] it was designated of RB-50B and used for strategic reconnaissance. [. . .] Some B-50s were later converted to hose-type KB-50 aerial tankers, their speed enhanced by the addition of two 5,200-pound-thrust jet engines, so at 400 mph, they could refuel jet aircraft. One KB-50D became a drone to test Bell XGAM missiles, and 36 became long-range reconnaissance aircraft (WB-50D). Boeing built 371 B-50s between 1947 and 1953. [. . .].

No internet information forthcoming on B-50 losses in Korea.....

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