... of Steel Pipe: 6mm-20mm3) Steel grade of Steel Pipe: grade B , 20# , Q235 , ST 52 , ST374) Standards of Steel Pipe: ASTM A106 , ASTM 53 , API 5L and ... , Container by sea.Applications rangePetroleum, chemical, power; (oil, gas, water) liquid transport; shipbuilding, construction, steel structure; city piping system etc.Min Order ...