A Santa Rosa man hit an acquaintance with a pipe during a dispute over recyclable metals, according to the Sonoma County Sheriff’s Office.

Donald Giannini, 51, of Santa Rosa, was arrested Sunday on suspicion of felony assault with a deadly weapon and battery causing great bodily injury, Sgt. Spencer Crum said. He was booked into the Sonoma County Jail in lieu of $385,000 bail.

Another man, a 46-year-old Petaluma resident who wasn’t identified, reported the assault sometime after 8:20 a.m. Saturday, telling deputies Giannini came at him from behind and hit him in the head with a metal pipe at his home on King Road in rural Petaluma, Crum said in a statement. Giannini was visiting the home, and they had been arguing over the metals.

The Petaluma man told deputies he had taken metal to the recycling center Saturday, and Giannini was upset because the metal “may have belonged to Giannini,” Crum said.

After being struck, the Petaluma man was treated for a “significant laceration to the head” at Petaluma Valley Hospital and released. Deputies arrested Giannini about 1 p.m. Sunday at his sister’s house in Santa Rosa.

You can reach Staff Writer Julie Johnson at 707-521-5220 or julie.johnson@pressdemocrat.com. On Twitter @jjpressdem.