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Natalie
Cold Drawn Steel Tubes

 Welded pipe (welded steel pipe) processing process
Categorized by use
It is also divided into general welded pipe, galvanized welded pipe, oxygen blowing welded pipe, wire casing, metric welded pipe, roller pipe, deep well pump pipe, automotive pipe, transformer pipe, welded thin-walled pipe, welded special-shaped pipe, scaffolding pipe and spiral welded pipe.
General welded pipe: General welded pipe is used to transport low-pressure fluid. Made of, steel. It can also be manufactured from other mild steels that are easy to weld. Steel pipe to carry out water pressure, bending, flattening Cold Drawn Steel Tubes and other experiments, there are certain requirements for surface quality, usually the delivery length is 4-, often require a fixed ruler (or times the foot) delivery. The specifications of the welded pipe are expressed by the nominal diameter (millimeter or inch) The nominal diameter is different from the actual, the welded pipe has two kinds of ordinary steel pipe and thickened steel pipe according to the wall thickness according to the regulations, and the steel pipe is divided into two kinds of threaded and unspented according to the pipe end form.
Galvanized steel pipe: In order to improve the corrosion resistance of steel pipe, the general steel pipe (black pipe) is galvanized. Galvanized steel pipe is divided into two kinds of hot dip galvanizing and electric steel zinc, hot dip galvanized galvanized layer thickness, electro galvanizing cost is low. The production process of straight seam welded pipe is simple, the production efficiency is high, the cost is low, and the development is fast. The strength of spiral welded pipe is generally higher than that of longitudinal welded pipe, and it can produce welded pipe with a large diameter with a narrower blank, and can also use the same width blank to produce welded pipe Cold Drawn Tubes with different pipe diameters. However, compared with the same length of straight seam pipe, the weld length increased by 30~ and the production speed was lower.
Fields of application
Products are widely used in water engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, urban construction, is one of the twenty key products developed in China.
For liquid transport: water supply, drainage. For gas transportation: gas, vapor, liquefied petroleum gas.
The steel grades and varieties of steel pipe products are extremely diverse, and their performance requirements are also various. All of these should be distinguished according to user requirements or changes in working conditions. Usually, steel pipe products are classified according to cross-sectional shape, production method, pipe material, connection method, plating characteristics and use.
Steel pipe according to the cross-sectional shape can be divided into: round steel pipe and special-shaped steel pipe.
Special-shaped steel pipe refers to a variety of non-toroidal sections of steel pipe.
The main ones are:
Square tube, rectangular tube, oval tube, flat elliptical tube, semicircular tube, hexagonal tube, hexagonal inner circle tube, unequal hexagonal tube, equilateral triangular tube, pentagonal plum tube, octagonal tube, convex tube, double convex tube, double concave tube, multi-concave tube, melon-shaped tube, flat tube, diamond tube, star tube, parallel quadrilateral tube, ribbed tube, dropper tube, inner finn tube, twisted tube, B-shaped tube, D-shaped tube and multi-layer tube, etc.
According to the shape of the longitudinal section, the steel pipe is divided into: equal section steel pipe and variable section steel pipe. Variable section (or variable section) steel pipe refers to steel pipe with periodic precision welded tubes or non-periodic changes in the shape of the section, internal and external diameter and wall thickness along the long direction of the pipe. Its main contents are: external conical tube, inner conical tube, outer step tube, inner ladder tube, periodic section pipe, bellows, spiral tube, steel pipe with heat sink and rifle barrel with double line.

[ چهارشنبه 25 خرداد 1401 ] [ 12:41 ] [ Natalie ]

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aluminium coated tubes

 What are the price factors that affect large-diameter longitudinal welded pipes
First: the first is the reason for the technology, the larger the caliber of the large-diameter straight-seam welded pipe, the higher the requirements for the steel pipe equipment, the higher the cost of the equipment, the more difficult the technology, then the higher the price of the natural large-diameter straight-seam welded pipe.
Second: the second is the reason for the cost, large-diameter straight seam welded pipe for the use of flux and other raw materials is often relatively large, then the higher the natural cost, the higher the price.
Three: The last is aluminium coated tubes the reason for the weight, which everyone should know, the price of large-diameter straight seam welded pipe of different weights is naturally higher.
In the construction industry, there are many materials and varieties of steel pipes, and there are also different uses of steel pipes for different purposes, in which the straight-seam steel pipes are widely used with low cost and high production efficiency. Today we will learn about the knowledge of straight seam steel pipe.
Straight seam steel pipe belongs to one of the welded pipes, because of the different production processes, straight seam steel pipes can be divided into high-frequency straight seam steel pipes and submerged arc welded straight seam steel pipes. And because of the different forming methods of straight seam steel pipe, the submerged arc welded straight seam steel pipe will be divided into UOE or JCOE steel pipe. There are many steps in the process of submerged arc welding long seam steel pipe, from plate exploration, milling stainless steel tube 304 edge, pre-bending edge to final X-ray inspection II., pipe end magnetic particle inspection, and the straight seam steel pipe to be inspected can be applied according to the customer or the use of related anti-corrosion and coating.
In addition to the direct use of straight-seam steel pipe, it will also be processed according to the construction purpose, and the related processing methods are forging steel, extrusion, rolling, and pulling steel. The forged steel is processed and extruded into the desired shape and size by the pressure of the machine. Extrusion processing is mostly used for the production of non-ferrous steel, generally the steel placed in the extrusion cylinder is extruded through one side of the pressure, and then extruded in the mold hole. Rolled and drawn steel, on the other hand, creates a state of cross-sectional and length change for straight-seam steel pipes.
Steel pipes can be divided into: black pipe (not coated) and coated pipe according to the surface coating characteristics.
Coated pipes include galvanized pipes, aluminized tubes, chrome-plated tubes, aluminized tubes and Cold Drawn Seamless Tubes other alloy layer steel pipes.
Coated tubes include outer coated tubes, inner coated tubes, and inner and outer coated tubes. Commonly used coatings are plastics, epoxy resins, coal tar epoxy resins and various glass-type anti-corrosion coating materials.

[ چهارشنبه 25 خرداد 1401 ] [ 12:40 ] [ Natalie ]

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side impact door beams

 Precision steel pipe pickling passivation technology elements: the purpose is to provide a pickling passivation process, the technology can reduce the material cost, at the same time, the process can increase the manufacture of precision steel pipe pickling passivation speed, reduce the manufacturing difficulty.
Pickling passivation with good tenacity: mold in the process of extrusion should bear at the same time significantly impact extrusion, the bending stress, and other complex load. Selected materials, so the requirement side impact door beams after heat treatment, should have high tenacity. Therefore, the mould Materials should have good hardenability and the uniform organization.
Pickling passivation has good thermal stability: when continuous production, the rise of temperature of the mold to or greater than 200 ℃, sometimes the use 160-180 ℃ tempering temperature of mold materials, can reduce the intensity, hardness, therefore, used in the mould of high temperature material, should be Good resistance to tempering stability.
Pickling passivation good abrasion resistance, mold should have high abrasion resistance, to ensure the normal service life, produce large quantities of qualified extrusion. In general, the precision of steel tube hardness and abrasion resistance under corresponding conditions is proportional to the. So the requirement model
Provide materials not only should have corresponding hardenability, must have the high beam impact tubes hardenability. But except hardness, determine the abrasion resistance of steel and heat treatment after the matrix organization thickness, composition, excess and mouth fire carbide precipitation phase number, size, type, degree of dispersion
And red hardness, etc.
Good manufacturability: cold extrusion mold manufacturing cycle is long, complex technology, high accuracy requirement. Generally must be made via the forging, machining, heat treatment, grinding or other finishing, etc. Therefore, only the manufacturability is good material, can meet the production On the need.
Galvanized pipe in the machining process, the welding using a direct current welding, the welding line and flow rate for large electric welding head position, form a strong magnetic field. Play under the effect of the electromagnetic field, the magnetic moment get or tending to get an electric magnetic field and the same bearing sort. when After welding, electromagnetic field gradually reduce until there is no, because of the hysteresis problems, on the galvanized pipe and the relative density of the magnetic flux entities.
Galvanized pipe remanence beings can make the image intensifier deflection of the electron beam azimuth, x ray image formation of industrial TV monitoring system "S" type of distortion, affect the natural shortcomings, such as porosity, slag is mainly under welding, cracks and other strip natural defect detection rate. With the increase of pipeline steel grade and the X-ray impact beam tubes image intensifier television system HuanXing, the harm of residual magnetism. In addition, the remanent magnetism beings, will also in the pipeline ring butt welding formed when partial arc, welding quality.
To get rid of galvanized pipe the remaining residual magnetism, everybody also can adopt the following several ways:
1, heating treatment; 2, followed by annealing process; 3, the electromagnetic coil degaussing.

[ چهارشنبه 25 خرداد 1401 ] [ 12:40 ] [ Natalie ]

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cold drawn tubes

What is the cause of the stainless steel pipe crack? Relevant experts to test the crack of steel pipe, the water quality of steel pipe are analyzed. Results: the crack as stress corrosion cracking; When used in 60 ~ 120 ℃ temperature environment, the chloride ion content and total hardness steel pipe water quality exceeds bid badly is the cold drawn tubes stainless steel tube in the stress of the main causes of stress corrosion fracture.
Should be under the influence of the environment corrosion cracking caused by metal.
Occurrence crack must have two conditions. There is stress and corrosive medium.
Stress corrosion is one of the important failure forms of stainless steel, the typical stress corrosion crack in dendritic. The stress corrosion of stainless steel under different corrosion medium environment behavior research is one of the important contents of stainless steel corrosion research. Combined with practical examples, this paper stated.
Stress corrosion cracking of stainless steel process, and the damage to equipment, analyzes its reasons, find out the reasonable ways to avoid stress corrosion cracking.
Galvanized pipe saponification eliminate celite carrier surface adsorption, reduce the chromatographic peak tailing, carrier before using acid or alkaline cleaning processing. Saponification is the carrier with 6 mol/L HCL leaching boil 2 h or heating concentrated hydrochloric acid leaching for 30 min, filtration, washed with water to neutral, Drying. Acid can remove saponification surface impurities such as iron, aluminum, calcium, magnesium, but cannot remove silicon alcohol group. Galvanized pipe saponification carrier is suitable for analysis of acid samples.
Principle: galvanized pipe saponification membrane theory could help explain the mechanism of the saponification, namely saponification is due to the metal and oxidizing substances, role in the metal surface to beam impact tubes generate a thin, dense, covering the performance good, firmly adsorbed on the gold Of surface passivation membrane. The membrane into individual existence, saponification is usually metal oxide compound. It plays the metal with the corrosive medium completely separated, saponification prevent metal contact with the corrosive medium, thereby to dissolve metal ground to a halt Into a passive state in line with the anti-corrosion effect.Discuss auto precision steel tube rolling design simulation and optimization.
Manufacturer in accordance with the section shape, the car round and special-shaped precision steel tube points two kinds, special-shaped tube with square, oval, triangle, hexagon, melon seeds, star, a variety of complex shapes with fin tube. 650 mm in diameter, small diameter of 0.3 mm. The car fine Steel pipe made of whole piece of metal, there is no seams of steel tube surface. According to the production method of hot-rolled tube, cold rolling tube, cold drawn tube, extrusion tube, pipe jacking, etc.
Is to the design and manufacturing of steel pipe. Auto precision steel tube is made of 10, 20, 30, 35, 45 carbon steel 16 mn, 5 MNV low alloy structural steel or 40 cr, 30 crmnsi, 45 mn2 and 40 MNB guitar made from hot rolled or cold rolled steel. The numerical model The proposed technique to speed up the development of manufacturing technology.
Application of precision steel tube is on the plug mill production. Check and clear the surface of solid billet defects, cut into the required length, centered on billet perforation of end face, and then into the side impact beams heating furnace, and on the punch hole. At the top of the roller and make Use the blank inner cavity gradually formed. Then into the plug mill and continue rolling. The machine full wall thickness, diameter of the sizing mill is fixed, conform to the specifications. Using continuous rolling mill production car precision steel tube is a kind of good method. In order to get Small size, good quality of steel pipe, cold rolled, cold drawn or two methods should be used in combination. Cold rolling is usually carried out on the double roller mill. Steel pipe is made by a circular groove with variable cross section and a fixed cone head consisting of a circular groove rolling System.

[ چهارشنبه 25 خرداد 1401 ] [ 12:40 ] [ Natalie ]

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