A worker walks by steel rolls at the Chongqing Iron and Steel plant in Changshou, Chongqing, China August 6, 2018. Picture taken August 6, 2018. REUTERS/Damir Sagolj/File Photo BEIJING : Steel rebar prices in China hit their lowest in three years this week, underscoring flagging growth in the world's second-largest economy, particularly in its weak property sector. The spot price of HRB400 20mm steel rebar - used to reinforce concrete for buildings and infrastructure - fell to 3,510 yuan ($507.80) per tonne in Shanghai on Thursday, data from consultancy Mysteel showed.