galvanized steel tube flang Size: from 1/2 to 200 inch (DN15-DN6000) ... , BS, JIS, EN, JB, GB, HG, UNI, API galvanized steel tube flang Technics: Forged Size: from 1/2 to 200 inch ... line; easy to seal pipe line, such as oil, petroleum, gas, chemical industry, nuclear power station, water and nuclear power construction ...