... SS540,Q195,45# Dimensions: Dia. 2mm~180mm Place of Origin: China (Mainland) Hot rolled round bar 2 ... , knots, laps and inclusions on the surface of the steel product for the pressure working use. ... , pits, which do not exceed one half of the size tolerance by counting from the actual ... steel production base of China, with general headquarters in Shijingshan District of Beijing. Covering an area of 1,383 ...