openPR Logo
Press release

Innovation of Cold Drawing Process of Seamless Steel Pipe and its Existing Problems

08-11-2022 09:39 AM CET | Industry, Real Estate & Construction

Press release from: Permanent Steel Manufacturing Co.,Ltd

Innovation of Cold Drawing Process of Seamless Steel Pipe and its

Speeding up and strengthening the drawing process of seamless steel pipes, improving the quality of pipe making, and improving the intermediate process are the keys to simplifying the cold drawing process of seamless steel pipes and winning "high yield, high quality, multiple varieties, and low consumption". The following seamless steel pipe manufacturers will introduce to you the main experience and exploration work in this regard.

1. Hammer Technique
Change to hot rolling head or waste heat hammer. This can save heating before hammer, save fuel and labor, and shorten the production cycle of seamless steel pipes.

2. Lubrication process
In the production of seamless steel pipe cold drawing, lubrication technology is an important factor that directly affects the output, quality, consumption and labor conditions.

3. Tempering process
Currently, two types of dies are used in short mandrel drawing and mandrelless drawing i.e. conical outer die and cylindrical mandrel or conical with curved outer die in short mandrel drawing mandrel.

At present, there are four cold drawing methods for cold drawn seamless steel pipes: long mandrel drawing, short mandrel drawing, air drawing and expansion drawing.

1) Long mandrel drawing

The long mandrel drawing is to put the pipe on the long mandrel, and then draw it together with the long mandrel through the drawing die. The diameter of the seamless steel pipe is reduced in the annular channel formed by the mandrel and the die hole, and the wall thickness is compressed.

2) Pull out the short plug

The short plug drawing is to draw the pipe through the drawing die, so that the diameter and wall can be reduced in the annular hole formed by the die hole and the fixed plug.

3) No plug diagram

It is the hollow compression of the pipe through a wire drawing die, the diameter is reduced, but the wall thickness is increased. The increase varies with the size of the seamless steel pipe, and is generally 1% of the diameter compression. However, when the inner diameter of the tubing is less than the second wall thickness, the wall thickness will decrease.

4) Dilation and stretching

There are two methods, one is the compression method and the other is the traction method, each with its own advantages and disadvantages. The latter has a large amount of expansion and is not easy to bend, but the pipe end must be rolled before expanding, which increases metal consumption. The former is only used for the expansion of thick-walled pipes.

The seamless steel pipe has uneven deformation during the cold drawing process, resulting in additional stress, which remains in the pipe as residual stress after cold drawing. The degree of uneven deformation of seamless steel pipe determines the size and distribution of its residual stress.

The cold drawing deformation of seamless steel pipe is determined by its deformation characteristics. Since there is no mandrel involved in the processing of the pipe wall during the air-drawing process, the thickness of the pipe wall changes very little after deformation, and the deformation conditions and deformation states of the inner and outer layers of the seamless steel pipe are very different, resulting in uneven deformation.

During the deformation process, the metal close to the inner surface of the seamless steel pipe first enters a state of plastic deformation, and the metal flows in the axial direction without being affected by the resistance generated by friction, so that the axial deformation is uneven along the wall thickness direction, resulting in the outer surface of the seamless steel pipe. The natural extension of the layers is significantly lower than the inner layers. In this way, the axial and tangential additional tensile deformation and additional tensile stress generated by the outer layer of the seamless steel pipe reach the maximum value; on the contrary, the axial and tangential additional compressive deformation and compressive stress generated by the inner layer of the seamless steel pipe also reach the maximum value. value, the additional stress becomes residual stress after deformation and remains in the tube.

To sum up, due to the uneven deformation of the seamless steel pipe after emptying, there is a large residual stress in the seamless steel pipe, so it is necessary to find an effective method to reduce the residual stress of the empty-drawing steel pipe to reduce the harm of longitudinal cracking.

Tips: Seamless Mechanical Tubing: tubing used for mechanical and light gauge structural applications. Mechanical tube is produced to meet specific end use requirements, specifications, tolerances and chemistries. This allows for more specific property uniformity throughout the tube compared to standard pipe.

Permanent Steel Manufacturing Co.,Ltd has years of experience in manufacturing of carbon steel pipe, stainless steel tube, hollow section, pipe fittings.(Fluid Pipe/Boiler Tube/Fire Pipe/Line Pipe/Structure Tube) Please refer to:

Permanent Steel Manufacturing Co.,Ltd:
Address: #668,Lugu Avenue,Hi-Tech Industrial Development Zone,Changsha,China
Whatsapp: 0086-13548700205
Skype: .cid.ce4875be2fc52aa2
Seamless steel pipe:
ERW steel pipe:
Seamless mechanical tubing:
Seamless Casing pipe:

This release was published on openPR.

Permanent link to this press release:

Please set a link in the press area of your homepage to this press release on openPR. openPR disclaims liability for any content contained in this release.

You can edit or delete your press release Innovation of Cold Drawing Process of Seamless Steel Pipe and its Existing Problems here

News-ID: 2702909 • Views: 445

More Releases from Permanent Steel Manufacturing Co.,Ltd

Quality Defects and Prevention of Oil Well Pipe
The quality defects of oil well pipes mainly come from three aspects: The first is the quality defect of the oil well pipe body itself, such as the mechanical properties of the pipe body, the inner connection, the weighing, etc., which do not meet the requirements; The second is the quality defect produced during the processing of the oil well pipe, such as the thread parameters (taper, thread pitch, tooth
Analysis and Comparison of Eddy Current Testing and Magnetic Flux Leakage Testin …
Analysis and comparison of eddy current testing (ET) and magnetic flux leakage testing (MFL) of seamless tube(SMLS): With the development of the national economy, all kinds of seamless tubes are widely used in petrochemical and boiler manufacturing industries, especially in harsh working conditions such as high temperature and high pressure, which have higher requirements for the quality of seamless steel tubes. Seamless steel tubes are generally made through the processes of
Submerged Arc Welding - the Most Practical Steel Pipe Welding Technology
Submerged arc welding (SAW) is one of the most efficient mechanized welding methods today. Its full name is automatic submerged arc welding, also known as automatic arc welding under the flux layer. Submerged arc welding technology is ideal for important applications such as pipelines, pressure vessels and storage tanks, rail manufacturing and large-scale construction. Available in the simplest form of single wire, double wire construction , series double-filament structure, multi-filament structure. Submerged
Ten Ways to Remove Burrs from Steel Pipes
Burrs are ubiquitous in the metalworking process. No matter how advanced and sophisticated equipment you use, it will be born with the product. It is mainly due to the plastic deformation of the material and an excess iron filings generated on the edge of the processed material, especially for materials with good ductility or toughness, which are particularly prone to burrs. The types of burrs mainly include flash burrs, sharp corner

All 5 Releases

More Releases for Seamless

Carbon steel seamless tube vs Stainless steel seamless tube
The difference between carbon steel seamless tube and stainless steel seamless tube mainly refers to the difference in design rules between carbon steel and stainless steel, which means that the design rules of these two types of steel cannot be used in common. These differences are summarized as follows: Carbon steel 1. Ordinary steel is carbon steel, that is, iron-carbon alloy. According to the level of carbon content, it is divided into
Seamless steel tube hardness testing
The hardness test is to slowly press a hard indenter into the surface of the sample under specified conditions, and then test the depth or size of the indentation to determine the hardness of the material. Hardness test is a simple, rapid and easy-to-implement method in material mechanical property test. The hardness test is non-destructive, and there is an approximate conversion relationship between the material hardness value and the tensile
Anti-corrosion technical requirements for seamless pipes
Seamless steel pipe (SMLS) is the most widely used pipe material at present. Generally, it needs anti-corrosion treatment when it is used for chemical pipelines, oil pipelines, natural gas pipelines, water pipelines and other projects. The common anti-corrosion processes of seamless steel pipes mainly include 3PE anti-corrosion, Epoxy coal tar anticorrosion, epoxy resin anticorrosion, IPN8710 anticorrosion, cement mortar anticorrosion technology, etc. 1. Why is seamless steel pipe anti-corrosion? Seamless steel pipe is
seamless and welded pipe
Seamless steel pipe is a round, square and rectangular steel with a hollow section and no joints on the periphery. Seamless steel pipes are made of steel ingots or solid tube billets through perforation into capillary tubes, and then made by hot rolling, cold rolling or cold drawing. Welded steel pipes refer to steel pipes with seams on the surface that are welded after bending and deforming steel strips or steel
cs seamless pipe extrusion process
Structural and cs seamless pipe are both extruded. That means a billet of material is forced through a hole in a die shaped to form the two-dimensional cross-section. Extrusion of seamless tubes Extrusion method refers to the metal blank into the extruder barrel, extrusion molding and extrusion rod composed of "closed" container by applying pressure to force the metal extruded rod extrusion die orifice outflow from, and access to metal plastic molding
Seamless Pipes Market 2025: Top Key Players Michigan Seamless Tube, LLC., Tenari …
Market Definition and Introduction Seamless pipes are a type of pipe with round, hollow cross sections without seams. Generally, they are a wrought steel tubular product manufactured without a welded seam. They are conventionally manufactured using a hot forming process through either extrusion or drawing. This is generally followed by cold sizing and molding the pipe into a desired shape and proportion and giving it desirable properties. Seamless pipes are generally