Is Rizhao Ruby Building Materials State-owned?

Not state-owned enterprises, but private enterprises.

Qingdao Ruby Cement Manufacturing Co., Ltd. is now a subsidiary of Shandong Ruby Building Materials Co., Ltd., a subsidiary of Laigang Group. Laiwu Iron and Steel Group Co., Ltd. is a large-scale iron and steel joint venture integrating production, scientific research, circulation, finance and service, focusing on steel products, with 16 subsidiaries, 12 directly affiliated units and 90 cooperative enterprises, with total assets of1200 million yuan and two production systems with an annual output of 6 million tons of electric furnace steel and converter steel. With advanced technology, it was rated as one of the top 100 competitive enterprises in China and one of the top 100 industrial technology development enterprises in China. It is one of the top 500 enterprises in China building materials industry, and passed the ISO9002 quality system certification of China metallurgy for the first time.