China's 'explosive' ironmaking breakthrough achieves 3,600-fold productivity boost / British Steel owner preparing to bring forward blast furnace closures / Thousands of jobs at risk as British Steel make major move to shut blast furnaces / 'Devastating': Port Talbot steelworks to shut blast furnaces and shed up to 2,800 jobs / Port Talbot: Tata Steel's blast furnaces to close with 3,000 expected job losses / British Steel to shut blast furnaces putting 2,000 jobs at risk / British Steel to shut down blast furnaces 'leaving 2,000 jobs at risk'