PITTSBURGH – (WPXI) – Food giant The Kraft Heinz Co. may give up naming rights on the Pittsburgh Steelers’ home turf, Heinz Field, when the $57 million deal expires in 2021, according to Street & Smith’s Sports Business Journal, a publication that is owned by American City Business Journals, which also owns the Pittsburgh Business Times. Industry insiders expect Kraft Heinz to drop naming rights to stadium. A 20-year deal expires in 2021 as Kraft Heinz — and professional sports — have undergone big changes. The company put its name on the stadium in 2001 when it was still known as the H.J. Heinz Co. But since then, much has changed for Heinz, which was acquired by private equity firm 3G Capital and Berkshire Hathaway in 2013, then merged with Kraft Foods Inc. two years later. Staff and offices have been slashed in Pittsburgh, and the executive team is based in Chicago, although the company says it is headquartered in both cities. SBJ cites industry experts as saying they don’t expect the Heinz name to be on the stadium come 2021. It does, however, note that Heinz is still at the table