Types of hot rolled seamless steel pipe supply

Carbon steel semless pipe, Alloy steel seamless pipe, Wall thickness steel pipe

Hot rolled seamless steel pipe specification:

Outer diameter: 2”-40” (60mm-1016mm).
Wall thickness: 2mm-100mm.

Length: 3m-14m

Surface: oiling, spraying black paint ( or varnish), galvanized, 3PE, FBE epoxy anti-corrosion coating etc.

Applications of hot rolled seamless steel pipe

Widely used in industry, chemical industry, construction, water treatment, agricultural irrigation, highway billboards, fire fighting , bridge supporting , gas & oil conveying, mine and oilfield drilling.

Production of hot finished seamless tubing

The process begins with solid steel rounds, or billets, being cut to a specified length and sent through a walking-beam reheat furnace, where temperatures reach nearly 2,300°F. After exiting the reheat furnace, the preheated rounds are turned into a tube shell in the rotary piercing mill as the billets are cross-rolled between two barrel-shaped rolls at a high speed. The seamless shells enter mandrel mill, where they are rolled over a retained mandrel to provide the needed OD size and wall thickness for the next process. The process is carefully monitored using a state-of-the-art hot-wall measuring system. The shells are then reheated for final forming in a 24-stand stretch-reducing mill, where outside diameters are formed to customers’ exacting specifications. Wall thickness is again verified using a hot-wall measuring system. After being rotated and advanced on the walking-beam cooling bed, the pipes are batch cut and transferred to an in-process storage area, where they are handled by computer-controlled gantry cranes. 

Hot rolled seamless steel pipe quality inspection:

1. Our factory has its own "experimental testing center".CNAS Laboratory Accreditation Certificate

2.Control quality strictly.The first pass is the quality inspection on the production line,The second pass is full inspection of the  production quality .

3.We have got internationally recognized certificates, ISO, CE, LR,Philippine certificate,also support third-party testing,as SGS, BV, ect.

Features of hot rolled seamless steel pipe

Carbon seamless steel pipe (SMLS) is formed by drawing a solid billet over a piercing rod to create the hollow shell, without welding or seam. The most advantage is increasing the ability of withstanding higher pressure.n improve material utilization, simplify the manufacturing process, save materials and processing time, such as rolling bearing rings, jackets, etc., has been widely used to manufacture steel pipe.

Widely used for liquid, gas, and steam services both above- and below ground services.

Standard of carbon seamless steel pipe manufacturing

Hot-rolled seamless steel pipes are divided into general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, geological steel pipes and other steel pipes. Hot-rolled seamless steel pipe can destroy the casting structure of the ingot, refine the grain of the steel, and eliminate the defects of the microstructure, so that the steel structure is dense and the mechanical properties are improved. This improvement is mainly reflected in the rolling direction, so that the steel is no longer isotropic to a certain extent; the bubbles, cracks and porosity formed during casting can also be welded under the action of high temperature and pressure.

Hot-rolled seamless steel pipes, hot-rolled steel products, are difficult to control in terms of thickness and side width. We are familiar with thermal expansion and cold contraction. Even if the length and thickness are up to standard at the beginning of hot rolling, there will still be a certain negative difference after cooling. The wider the side width of this negative difference, the thicker the thickness, the more obvious the performance. Therefore, for large steel, the width, thickness, length, angle, and edge of the steel cannot be too precise.

Shenlong sells and produces various types of hot rolled seamless steel pipe. Our seamless steel pipe products have obvious advantages and lead global sales.

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