... BS, JIS, EN, JB, GB, HG, UNI, API water piping flang Technics: Forged Size: from 1/2 to 200 ... (Ff), Thrf (Ff) Facing Method: rust preventing oil, spray paint (black, yellow), hot galvanization, cold galvanization or colored electroplate, ... as oil, petroleum, gas, chemical industry, nuclear power station, water and nuclear power construction, shipbuilding, food manufacturing, construction, shipbuilding, ...