Well reported already but here is an extended play on Gupta and Whyalla
Gupta to stop use of coal in steelmaking at Whyalla, use wind and solar instead
Gupta finally delivers on green steel promise, phasing out coal at Whyalla Steelworks and replacing it with renewable-powered technologies.reneweconomy.com.au
Recycling is not exactly "steel making" but what they are doing is commendable.
Carbon free is poor terminology for steel.
Carbon is an essential ingredient, nothing wrong with that , just need to get it into the steel without blowing a heap into the atmosphere.
Steel is actually carbon storage, which is good.
Companies such as BMW are now demanding steel produced with low emissions to be used by their suppliers. Its going to be very challenging for some of them.