ASTM A 153-80 BS 729 : 1971 BS 1387 : 1985. DIN 2444, January 1984. NF A 49-700 December 1982 or steel articles Pipe steel, black and hot-dipped zinc-coated (galvanized) welded and seamless, for ordinary uses Zinc coating (hot-dip) on iron and steel hardware Hot dip galvanized coatings a iron steel articles Screwed and socketed steel tubes and ...
Under the background of promoting the large-scale development of photovoltaic power plants in the whole county, if there is no unified and standard power station construction quality standard, the income of the power station in the later stage cannot be guaranteed. To this end, various invest...
