The Australian government and BHP Billiton are inconsistent with China's steel production forecast: 

The Australian government expects China's steel output to be 886 million tons this year, and its output will drop to around 800 million tons by 2023; 

BHP Billiton believes that steel production will not peak until mid-2020 It may reach a height of 1 billion tons. 

Mike Henry, head of BHP Billiton's Australian operations, said that this year is also a year of high steel production in China, and such high output will remain for a long time, and demand for iron ore remains strong.