1 China's crude steel output this year was 480 million tons, reaching more than 36% of the world's crude steel output, and it is expected to reach 550 million tons next year. Traditional ironmaking technology will consume about 300 kilograms per ton of iron Coke. After the traditional ironmaking technology was replaced by the molten ironmaking method, which eliminated the coking process, China could smelt 165 million tons of coke each year, which is like quitting the steel giant. "Quit smoking for the steel giant" in the text means:. ['Reduce steel production costs.', 'Reducing pollutant emissions.', 'Improving the quality of smelting steel.', 'Improving the working environment of workers.']