Hot Rolled Cold Rolled/Gavanized/Stainless Steel Pipe for Construction of Bridge
Seamless steel pipes have hollow cross-sections and are widely used as pipelines for conveying fluids, such as pipelines for conveying oil, natural gas, coal gas, water and certain solid materials. Compared with solid steel materials such as round steel, steel pipes are lighter in weight when the bending and torsional strengths are the same. They are an economical cross-section steel material and are widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, bicycle frames, and steel scaffolding used in construction. Using steel pipes to manufacture annular parts can improve material utilization, simplify manufacturing processes, save materials and processing time, and have been widely used in manufacturing.
The production process of general seamless steel pipes can be divided into cold drawing and hot rolling. The production process of cold-rolled seamless steel pipes is generally more complicated than that of hot rolling. The tube blanks must first be subjected to three-roll continuous rolling, and then to sizing tests after extrusion. If there are no corresponding cracks on the surface, the round tubes must be cut by a cutting machine and cut into billets with a length of about one meter. Then enter the annealing process. Annealing requires pickling with acidic liquid. During pickling, pay attention to whether there are a large number of bubbles on the surface. If there are a large number of bubbles, it means that the quality of the steel pipe does not meet the corresponding standards. In appearance, cold-rolled seamless steel pipes are shorter than hot-rolled seamless steel pipes. The wall thickness of cold-rolled seamless steel pipes is generally smaller than that of hot-rolled seamless steel pipes, but the surface looks brighter than thick-walled seamless steel pipes, the surface is not too rough, and the diameter does not have too many burrs. The delivery state of hot-rolled seamless steel pipes is generally hot-rolled state and delivered after heat treatment. After quality inspection, hot-rolled seamless steel pipes are strictly hand-selected by staff, and then surface oiled, followed by multiple cold-drawing tests. After hot rolling, perforation tests are performed. If the perforation diameter is too large, straightening and correction are performed. After straightening, they are conveyed by the conveyor to the flaw detector for flaw detection, and finally labeled, arranged by specifications, and placed in the warehouse.
| Basically information of hot rolled steel pipe |
| OD |
10-700mm |
| Thickness |
Cold rolled: 1mm-10mm; Hot rolled: 4mm-20mm |
| Length |
1m-12m or customized |
| Size Tolerance |
1% more or less |
| Technology |
Hot roll, cold roll, cold drawn, honing |
| Material |
10#-45#, 16Mn, A53-2007, ASTM A671-2006, ASTM A252-1998, ASTM A455, ASME B36.10M-2004, ASTM A523-1996, BS 1387, BS EN10296, BS6323, BS6363, GB/T3091-2001, GB/T13793-1993, GB/T971 |
Packing of Steel Pipe
About us
Guolian group is located in Liaocheng, a beautiful water city in the north of China. It is initiated and established by the factories and companies of presidents consisted in Liaocheng International E-commerce Association.
Guolian Group mainly sells electric vehicles, electric motorcycles, passenger-carrying tricycles and large agricultural cargo loading tricycles, producing and selling hot-rolled and precision seamless pipes, galvanized color coated steel plates, auto parts processing, hardware products, non-ferrous metals, laser engraving machines and other dozens of categories and hundreds of varieties; The export market covers the countries and regions of the world's major markets, and has established long-term cooperation and mutual trust with some famous suppliers in the United States, the European Union, South Korea, Japan and other countries.
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