How is seamless steel pipe produced?

- Dec 31, 2020-

1. Introduction to seamless steel pipe
1. Introduction to seamless steel pipe


The seamless steel pipe is a circular, square, rectangular steel with a hollow section and no seams around it. The seamless steel pipe is formed by perforating a steel ingot or a solid tube blank, and then hot rolled, cold rolled or cold drawn. The seamless steel pipe has a hollow section and is used as a pipe for conveying fluid. Compared with a solid steel such as round steel, the steel pipe has a lighter weight when it has the same bending and torsional strength, and is an economical section steel which is widely used for manufacturing structures. Parts and mechanical parts, such as steel scaffolding for oil drills.


2. History of seamless steel pipe development


Seamless steel pipe production has a history of nearly 100 years. The German Mannesmann brothers first invented the two-roll cross-rolling piercing machine in 1885, and invented the cycle rolling mill in 1891. In 1903, the Swiss Ritteriefel invented the automatic pipe rolling machine (also called the head-rolling pipe). Machines, and later various types of extension machines such as continuous tube rolling mills and pipe jacking machines, began to form a modern seamless steel pipe industry. In the 1930s, the quality of the steel pipe was improved due to the use of a three-roll mill, an extruder, and a periodic cold-rolled pipe mill. In the 1960s, due to the improvement of continuous rolling mills, the emergence of three-roller punching machines, especially the application of tension reducing machines and continuous casting blanks, increased production efficiency and enhanced the ability of seamless pipes to compete with welded pipes. In the 1970s, seamless pipes and welded pipes were moving in parallel, and the world’s steel pipe production increased at a rate of more than 5% per year. After 1953, China attached great importance to the development of seamless steel pipe industry, and has initially formed a production system for rolling various large, medium and small pipes. Copper pipes are generally also used in the ingot blank rolling piercing, rolling mill rolling, coil stretching process.


3. Use and classification of seamless steel tubes


use:


Seamless steel pipe is an economical section steel, which has a very important position in the national economy and is widely used in petroleum, chemical, boiler, power station, shipbuilding, machinery manufacturing, automobile, aviation, aerospace, energy, geology, construction and military. each department.


classification:


1 according to the shape of the section: circular section tube, profiled section tube


2 according to the material: carbon steel pipe, alloy steel pipe, stainless steel pipe, composite pipe


3 according to the connection method: threaded connecting pipe, welded pipe


4 according to the production mode: hot rolling (squeezing, top, expansion) tube, cold rolling (pull) tube


5 according to the purpose: boiler tube, oil well tube, line tube, structural tube, fertilizer tube…


4. Production process of seamless steel pipe


1 Main production process of hot-rolled seamless steel pipe (main inspection process):


Tube blank preparation and inspection → tube billet heating → perforation → rolling tube → waste tube reheating → fixed (reduced) diameter → heat treatment → finished tube straightening → finishing → inspection (non-destructive, physical and chemical, Taiwan inspection) → storage


2 cold rolling (drawing) seamless steel pipe main production process


Blank preparation → pickling lubrication → cold rolling (pull) → heat treatment → straightening → finishing → inspection 5, hot rolling seamless steel pipe production process flow chart is as follows:



Product Description




Galvanized Steel Pipe
Name
Seamless steel pipe
Standand
GB, ASTM A53, ASTM A106, API 5L, API 5CT
Outer Diameter
1/8 inch-16 inch 
Wall Thickness
2.5mm-40mm
Material
10#  20#  45#  16Mn, Q345, X42, X52,X60
Surface treatment
Rust-proof black painting or as customer's request.
Certification
SGS, ISO9001
Technique
Hot-rolled/Cold-drawn/Hot-expanded
Usage
For conveying gas, water and oil either in the oil or natural gas industries.
Our products

More details

Laboratory

We have own test lab to ensure the quality. The equipment can do the tensile test, yeild test along with elongation test. Move over the Sino Steel Impex have its own 5+ Quality Control team with 10+ years experence except the QC people in ites factories.

Factory

Tianjin Dongfang Haoyu International Trading Co., Ltd.

Tianjin Dongfang Haoyu is member of CNSG.Located in Tianjin Daqiuzhuang. Sino Steel Group (CNSG) built in 1995 with registered capital of RMB 120 million, we have an annual production capacity of 244000 MT and exporting quantity of 60,000MT.

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