Ryerson Inc., Chicago, IL, stockholders voted to approve the agreement allowing acquisition of Ryerson by Platinum Equity, LLC.   ; Upon closing, Ryerson will become a wholly-owned subsidiary of Rhombus Holding Corporation. Rhombus Holding Corporation is owned by a private investment fund or funds affiliated with Platinum Equity, LLC.   ; Ryerson Inc. is a distributor and processor of metals in North America, with 2006 revenues of $5.9 billion. The Company services customers through a network of service centers across the U.S. and in Canada, Mexico, India, and China.