UPDATE 1-3M names operating chief Roman as CEO, Thulin to become chairman

(Adds details on appointment, background on Thulin)

March 5 (Reuters) - Diversified manufacturer 3M Co on Monday promoted Chief Operating Officer Michael Roman to chief executive officer, replacing Inge Thulin, who will become executive chairman in July after a six-year stint as CEO.

Roman, 58, has served as the Minnesota-based company's operating chief since July last year. He was chosen as CEO after a thorough succession planning process, Thulin said in a statement.

Thulin, who began his career with 3M Europe some four decades ago, will chair 3M's board of directors while also working with Roman on longer-term strategic initiatives for the company.

Thulin has overseen several of 3M's deals including its $1.8 billion purchase of KKR & Co's Capital Safety, which makes worker protection gear.

3M's shares were slightly higher in choppy after-hours trading. (Reporting by Arunima Banerjee in Bengaluru; Editing by Sai Sachin Ravikumar)