This is a very common and important question in the field of metal materials. Simply put, a welded pipe is made by coiling and welding steel strip or steel plate, so it has a seam; while a seamless pipe is made by piercing and rolling a solid steel billet, so it has no seam. In the broad category...

ZAM U/C CHANNEL FOR SOLAR PANEL BRACKET Material:S350GD/S390GD/S420GD/S550GD U-Channel Size:41*21,41*41,41*52,41*62,41*72,41*82 ;Thickness:1.0-3.0mm C-Channel Size:40*40-120*450mm;Thickness:1.5-5.0mm

Production Range cover 15*15 mm -500*500 mm; 15*20 mm -400*600 mm. Standard: GB/T 6728, ASTM A500, BS EN 10219, AS 1163, JIS G 3466

Production Range cover 15*15 mm -500*500 mm; 15*20 mm -400*600 mm. Standard: GB/T 6728, ASTM A500, BS EN 10219, AS 1163, JIS G 3466

Production Range cover 1/2’’ – 10’’, thickness from S06 mm to 10.0 mm. Standard: GB/T 6728, GB/T 3091, ASTM A36, ASTM A53, ASTM A500, BS 1387, ISO 65, BS EN 39, JIS G 3444

Production Range cover 1/2’’ – 10’’, thickness from S06 mm to 10.0 mm. Standard: GB/T 6728, GB/T 3091, ASTM A36, ASTM A53, ASTM A500, BS 1387, BS EN 39, JIS G 3444, API 5L, API 5CT