Standard: bs, gb, jis, bs 6363, bs en10025, gb/t8162, gb/t8163, jis g3454-2007 grade: 10#-45#, 16mn, q195-q345, st35-st52, stb35-stb42, 10#, 20#, 45#, 16mn, q195, q215, q235, q345, st35, st45, stb35, stb42 thickness: 1.2 - 2.0 mm section shape: square outer diameter: 15-300mm place of origin: hebei, china (mainland) secondary or not: non-secondary application: structure pipe technique: hot rolled certification: sgs surface treatment: black special pipe: emt pipe alloy or not: non-alloy product name: square steel pipe surface: black painted material: q195/q215/q235/q345 keyword: ms square tube type: cylinder tube name: popular shape: square section end protector: iron protector length: 6-12m usage: construction structure