DN 1200/1800 large diameter spiral steel pipe is a special steel pipe with larger inner and outer diameters. It is mainly used to transport large flows of liquids, such as water and oil. Due to its good water corrosion resistance, excellent strength and rigidity, and impact resistance, it is widely used in industrial water treatment, oil field mining, chemical production, groundwater exploration, metallurgical industry, aerospace industry and other fields.
DN 1200/1800 large-diameter spiral steel pipes must undergo strict physical and chemical inspections before being put into use. Single-wire or double-wire submerged arc welding is used for the head-to-tail butt joints of the strips. Automatic submerged arc welding is used for repair welding after being rolled into steel pipes. In addition, before forming, the strip steel will go through multiple processes such as leveling, trimming, planing, surface cleaning and conveying, and pre-bending to ensure the quality and performance of the steel pipe.
Product Description
| size | OD:159--3020mm in TheoryThickness:4--25mm in TheoryLength:Usually 6~12 Meters, 20 Meters Max in Theory |
| Standard | SY/T5037 SY/T5040 GB/T9711 API5L EN10208 ASTM A252 JISA5525 |
| Material | Chinese Grade:Q235,Q345,S245,S290,S320,S360,S390,S415,S450ASTM:Grade A,Grade B,X42,X46,X52,X56,X60,X65,X70 EN:S185,S235JR,S235JO,E335,S355JR,S355JOL245,L290,L320,L360,L390,L415,L450 |
| Usage | Used For Water, Sewage, Gas, Stream, Combustible Fluids(Petroleum and Gas) |
| Ends | Beveled (Can be Protected By Plastic Caps or Steel Rings According to Your Requirements)Also We Can Weld Flanges on the Pipe Ends Plain Ends |
| Surface | Bared Or Paint With Oil, Bitumen |
| Technique | Hot Rolled and SSAW or DSAW |
| Package | Package With Steel Strip When O.D≤273MM, Otherwise In Bulk. |
| SSAW | LASW | ERW | |
| OD(mm) | 219-3220mm | 6-610mm | 406-1620mm |
| WT(mm) | 3-25mm | Max26.5mm | Max65mm |
| Standard | API5L,EN10217,DIN2458,BS1387-1985 | API 5L,BS1387-1985,JIS-G344,GB/T3091-2001 | API 5L,EN10217,DIN2458,BS1387-1985 |
