Apr 17, 2012. /Lesprom Network/. Standard & Poor’s Ratings Services has affirmed Metso’s BBB long-term and A-2 short-term corporate credit ratings and changed the outlook from stable to positive, as the company said in a press release received by Lesprom Network. Metso is a global supplier of technology and services to customers in the process industries, including mining, construction, pulp and paper, power, and oil and gas.