The standard and application of stainless steel seamless pipe and welded pipe

Stainless steel seamless pipe is a hollow cross-section and the surrounding no seam of the long stainless steel pipe. Stainless steel welded pipe is made of stainless steel plate or strip by crimping and then made of a steel pipe. Here to introduce the two under the standard steel.

 

The standard of stainless steel seamless pipe

 

Since the characteristics of seamless steel hollow section, a large number of pipes are used as the transport fluid, such as transportation of oil, gas, coal gas, water and some solid materials, pipes and the like. Stainless steel seamless pipe compared to round steel and other solid steel, in the same bending strength of the same torsional strength, the weight is very light, very economical and practical, many are used to manufacture structural parts and mechanical parts, such as oil drill pipe, Shaft, bicycle frame and steel construction scaffolding in construction. Parts of endless seamless pipe manufacturing, can improve material utilization, simplify the manufacturing process, saving material and machining time, such as bearing rings, jack sets.

 

The use of various seamless steel pipes

 

Structural seamless pipe is mainly used for general structure and mechanical structure; fluid transport with seamless pipe is used to transport water, oil, gas and other fluids; low pressure boiler seamless pipe is used to manufacture a variety of low and medium pressure Boiler superheated steam pipe, boiling water pipe and locomotive boiler with superheated steam pipe, large smoke pipe, small smoke pipe, etc .; high pressure boiler seamless pipe used in the manufacture of high pressure and above the pressure of the water pipe boiler; fertilizer equipment with high pressure seamless pipe Used in the manufacture of chemical temperature of -40 ~ 400 ℃, the working pressure of 10 ~ 30Ma chemical equipment and pipelines; oil cracking with seamless pipe is used in the manufacture of oil refinery furnace pipes, heat exchangers and pipes; geological drilling Steel pipe is for the geological sector for core drilling, according to the use can be divided into drill pipe, drill collar, core pipe, casing and sedimentation pipe; diamond core drilling seamless pipe is used to make diamond core drilling drill rod, core rod, the sleeve; seamless pipe for oil drilling pipe ends thicken the oil drilling within or external upset; ship carbon steel seamless pipe is used to make class I pressure vessels piping, II Pressure-resistant pipe Boiler and superheater; automobile axle casing seamless pipe is used to make automobile axle casing and the axle casing pipe axis.

 

The standard of stainless steel welded pipe

 

Stainless steel welded pipe production process is relatively simple, and a variety of high efficiency, but which is usually lower than the strength seamless pipe. However, with the rapid development of high-quality strip rolling production and welding and inspection technology advances, continuously improve the quality of welded, welded pipe quality is also rising, and some areas even replace the seamless pipe. welded pipe in the form of weld can be divided into straight seam welded pipe and spiral welded pipe.

 

Straight seam welded pipe production process is simple, high production efficiency, low cost, rapid development. Spiral Welded Longitudinal generally higher than can be used to narrow the larger diameter pipe billet production, but also with different widths of the same diameter pipe billet production. However, the same length of straight pipe joints than weld length increase to 30-100%, and lower production rate. So the smaller diameter of the pipe are mostly used straight seam welding, large diameter welded pipe are mostly used spiral welding.

 

The use of various stainless steel welded pipe

 

Low-pressure fluid delivery welding pipe is also called ordinary pipe, that is, people often say that the black pipe. Mainly used for conveying water, gas, air, oil and heating steam and other general lower pressure fluid, such pipe wall thickness is divided into ordinary steel pipe and thickened steel pipe; low pressure fluid transmission with galvanized welded pipe is also called galvanized welding Steel pipe, that is often said that the white pipe. Mainly used for conveying water, generally lower pressure fluid gas, air and steam heating oil, warm water etc., then such a steel pipe wall thickness divided into ordinary galvanized steel and thicker galvanized steel; ordinary carbon steel wire casing is Industrial and civil construction, installation of machinery and equipment and other electrical installation works for the protection of wire steel pipe; straight seam welded pipe is a vertical and horizontal steel pipe and pipe, generally can be divided into metric welded pipe, welded thin-walled pipe, transformer cooling tubing ; pressurized fluid delivery spiral submerged arc welded pipe is as hot strip roll, often warm spiral shape, double submerged arc welding method for steel spiral seam pressure fluid transmission, such Steel pipe pressure capacity, welding performance is good, mainly used to transport oil and natural gas pipeline; pressure fluid transmission with high-frequency spiral welded pipe is hot-rolled strip for pipe, often temperature spiral molding, the use of high-frequency lap welding method for high frequency spiral seam welded pipe pressure fluid delivery, the ability of such strong pressure steel, plastic, and easy welding and machining molding; Section through various stringency and Inspection and testing, safe and reliable, large-diameter steel pipes, transmission efficiency, and can save the laying of pipeline investments. Mainly used for the laying of oil, natural gas and other pipelines; low-pressure fluid transmission with spiral submerged arc welded pipe is hot-rolled strip for pipe, often temperature spiral molding, the use of double-sided automatic submerged arc welding or single-sided welding Method for the production of water, gas, air and steam and other general low-pressure fluid transmission with submerged arc welded pipe; low-pressure fluid transmission with high-frequency spiral welded pipe is hot-rolled steel coil for the pipe, often temperature spiral molding, The use of high-frequency lap welding for general low-pressure fluid transmission with high-frequency spiral welded pipe; pile with spiral welded pipe is hot rolled strip for pipe, often temperature spiral molding, the use of double-sided submerged arc welding Or high-frequency welding made for the civil building structure, terminals, bridges and other basic pile with steel.

 

Source: China Steel Pipe Manufacturer – Yaang Pipe Industry (www.pipelinedubai.com)

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