June 14 (Reuters) - Nucor Corp on Friday forecast second-quarter profit below analysts' expectations as lower steel prices dent margins, sending the company's shares down 4% in premarket trading.

The steelmaker expects adjusted earnings between $2.20 and $2.30 per share for the second quarter, compared with analysts estimates' of $3.00 per share, according to LSEG data.

The company reported adjusted earnings of $5.81 per share, a year ago.

Nucor said the largest driver for the expected sequential fall in quarterly earnings across its steel mills and products segments is due to lower average selling prices.

However, it sees earnings in its raw materials segment to be higher in the second quarter as compared to the first quarter, citing increased profitability of its direct reduced iron facilities.

Steel companies in the U.S. are seeing a fall in steel product prices, pressured by excess inventories, as demand softens for the quarter amid inflationary pressures and slowing infrastructure projects. (Reporting by Aatreyee Dasgupta in Bengaluru; Editing by Shailesh Kuber)