Benchmark Shanghai steel rebar futures eased following four days of gains and after hitting a 12-week peak in the previous trading session. They were down 0.5 percent at 3,647 yuan ($536.49) a tonne at 0200 GMT.
Prices of hot-rolled coil, a semi-finished product used to make automobile and household appliances, edged down 0.2 percent to 3,561 yuan.
Official Chinese data earlier this week showed that its overall economy cooled further in the fourth quarter, dragging 2018-growth to the lowest in nearly three decades.
The state planner in China also warned that downward pressure on the economy would impact the country's job market.
"There's a big probability that China's economic growth will continue to slowdown in 2019. But it is still uncertain how much effort the Chinese government will make to boost demand," said Richard Lu, an analyst at CRU in Beijing.
Lu expects a clearer picture on government policy to emerge after China's annual meeting of parliament in early March.
The lower prices in steel markets also came as China Iron and Steel Association (CISA) said that the average daily crude steel output at its member mills reached 1.84 million tonnes between Jan. 1 and 10, up 3.5 percent from Dec. 21-31, triggering worries about a supply glut in the near-term.
The most-active iron ore futures on the Dalian Commodity Exchange fell 0.9 percent to 5,27.5 yuan a tonne.
Coking coal edged up 0.5 percent to 1,222 yuan a tonne, while coke futures dipped 0.2 percent to 2,033.5 yuan.
(Reporting by Muyu Xu and Dominique Patton; Editing by Joseph Radford)
