A53-Gr-B-galvanized-square-steel-pipe refers to the steel pipe grade of foreign standards, that is, American Standard. A53-f corresponds to Q235 material in China, a53-a corresponds to 10# material in China, and a53-b corresponds to 20# material in China.General purpose galvanized Steel Pipe ASTM A53 gr.B, steel grade: sa53 B, specification: 1 / 4 "- 28", 13.7-711.2mm.
A53-Gr-B-galvanized-square-steel-pipeIntroduction:

Product Name	A53-Gr-B-galvanized-square-steel-pipe
Material	Zinc Coating Carbon Steel
Color	Silver
Standard	GB/T3091-2001 , BS 1387-1985 , DIN EN10025 , EN10219 , JIS G3444:2004 , ASTM A53 SCH40/80/STD , BS- EN10255-2004
Grade	Q195/Q215/Q235/Q345/S235JR/GR.B-D/STK500
Thread	Accroding to the buyer's request
Used	Building industry machinery/Construction of greenhouses.....

A53-Gr-B-galvanized-square-steel-pipe is a specification which covers steel pipes furnished in any one of the following conditions i.e. - zinc-coated, black and hot dipped, welded and SA 53 Gr B Seamless Pipes as well. Also covered by the specification is the Sa 53 Gr B Line Pipes which ranges from in NPS 1⁄8 to NPS 26. The specification also mentions that the steel used in the manufacture of both seamless as well as welded ASTM A53 Grade B Erw Pipes needs to be made by one or more of the following processes; i.e. - open hearth, electric furnace, or basic oxygen.