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Seamless steel pipe
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- Product Description
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Seamless steel pipe is made by perforating a whole round steel bar. There is no weld on the surface of the steel pipe, which is called seamless steel pipe. Seamless pipe is a long steel strip with a hollow cross-section and no seams around it.
Process
① After quality inspection, hot-rolled seamless steel pipes must be strictly hand-selected by staff, and the surface must be oiled after quality inspection, followed by multiple cold drawing tests. After hot rolling, perforation tests must be carried out. If the perforation diameter is too large, straightening and correction must be carried out. After straightening, it is conveyed to the flaw detector by the conveyor for flaw detection, and finally labeled, arranged in specifications, and placed in the warehouse.
② When producing cold-rolled seamless steel pipes, the tube blanks must first be subjected to three-roll continuous rolling, and then a sizing test must be carried out after extrusion. If there is no response crack on the surface, the round tube must be cut by a cutting machine and cut into a blank with a length of about one meter. Then enter the annealing process. Annealing requires pickling with acidic liquid. When pickling, pay attention to whether there are a lot of bubbles on the surface. If there are a lot of bubbles, it means that the quality of the steel pipe does not meet the corresponding standards. In appearance, the cold-rolled seamless steel pipe is shorter than the hot-rolled seamless steel pipe. The wall thickness of the cold-rolled seamless steel pipe is generally smaller than that of the hot-rolled seamless steel pipe, but the surface looks brighter than the thick-walled seamless steel pipe, the surface is not too rough, and the diameter does not have too many burrs.
Pipe blank--inspection--peeling--inspection--heating--piercing--pickling--grinding--lubrication and air drying--welding head--cold drawing--solution treatment--pickling--pickling passivation--inspection--cold rolling--degreasing--cutting head--air drying--internal polishing--external polishing--inspection--marking--finished product packaging
Common materials
Generally, seamless steel pipes are made of high-quality carbon steels such as 10, 20, 30, 35, 45, low-alloy structural steels such as 16Mn, 5MnV, or alloy steels such as 40Cr, 30CrMnSi, 45Mn2, 40MnB, etc., which are hot-rolled or cold-rolled.
Specification
Outer diameter
Wall thickness
length
MOQ
Packing
Delivery time
5mm-630mm
1mm-90mm
6m-12m OR customized size
30tons
Bundling
Packaging
Oil-coated bundling
Or oil-coated packing
30days
Common size
Outer diameter: 8mm-510mm; wall thickness: 1mm-90mm.
Advantages
Strong bending resistance.
Light weight.
Good corrosion resistance, can be used in high temperature, high pressure and harsh environment.
High reliability, no interface, not easy to leak or damage.
High precision and finish.
Wide range of applications, can be used to manufacture pipelines, parts, etc.
Application
General seamless steel pipes are used as pipelines for conveying fluids, such as pipelines for conveying oil, natural gas, coal gas, water and certain solid materials. In addition, they are also 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. Steel pipes are used to manufacture annular parts, which can improve material utilization, simplify manufacturing processes, and save materials.
Special purpose seamless pipes are mainly used as petroleum geological drilling pipes, cracking pipes for petrochemicals, boiler pipes, bearing pipes, and high-precision structural steel pipes for aviation.
Seamless steel pipe
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Products Category
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Seamless steel pipe
Seamless steel tube
Seamless round steel pipe
Shaped seamless steel pipe
Galvanized seamless steel pipe
china Seamless Steel Pipe
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