Specification And Application Of Seamless Steel Tube

Seamless steel pipe production method:

1. Hot-rolled seamless steel pipe

Hot - rolled seamless tube is generally produced in the automatic tube rolling set.After inspection and removal of surface defects, the solid tube billet is cut into the required length, then the core is settled on the perforating end of the tube billet, and then it is sent to the heating furnace for heating and perforating on the perforator.In the perforation at the same time continuously rotating and forward, in the role of the roller and the head, the tube blank internal cavity gradually formed, called capillary.And then send it to the automatic tube rolling machine for inheritance rolling.At last, the whole machine has the same wall thickness, and the diameter is determined by the sizing machine to meet the specification requirements.It is a better method to produce hot - rolled seamless steel tube by continuous rolling mill.

2. Cold rolling and cold drawing

To obtain seamless tubes of smaller size and better quality, cold rolling, cold drawing, or a combination of the two 

3. The extrusion method

By extrusion, the heated billet is placed in a closed extrusion cylinder, and the perforated rod moves with the extrusio

Specification and application of seamless steel tube:

The carbon steel seamless pipe has a hollow section and can be used as a conduit for conveying fluids, such as oil, natural gas, gas, water, and some solid materials.Compared with solid steel such as round steel, seamless steel tube has the same bending and torsional strength and lighter weight. It is a kind of economic section steel, widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffolding used in construction.Ring parts made of seamless steel tube can improve material utilization, simplify manufacturing process, and save materials and processing time.Steel pipe or a variety of conventional weapons indispensable materials, gun barrel, gun barrel to steel pipe to manufacture.

1. Seamless steel tube for structure (GB/ t8162-2008) is the seamless steel tube for general structure and mechanical structure.

2. Seamless Steel Pipe (GB/ t8163-2008) is the oil line seamless steel pipe used for conveying water, Oil, gas and other fluids.

3. Seamless steel tube for low and medium pressure boiler (gb3087-1999) is used for manufacturing various structures of low and medium pressure boiler overheating

Steel tube can be divided into round tube and shaped tube according to the shape of cross section area. Since the area of the circle is the largest when the circumference is the same, more fluid can be transferred with the circular tube.In addition, when the ring section is under internal or external radial pressure, the force is relatively uniform, therefore, the vast majority of steel tubes are circular tubes. But, circular tube also has certain limitation, if be subjected to the condition of plane bending, circular tube is inferior to square, rectangle tube bending strength is big, a few agricultural machinery have skeleton, steel wood furniture to be used commonly square, rectangle tube.Special shaped steel tubes with other cross section shapes are required for different purposes.

 

Seamless Steel Pipe

What Is The Difference Between Galvanized Steel Pipe And Welded Steel Pipe?

When building a house, when decorating, when processing operations, often will use a large number of steel pipe, the existence of steel pipe, gave it a great meaning, for people's life and work to bring great convenience. Because a lot of places are used Steel tube, so now there are many different kinds of pipes, common is galvanized and welding the two tubes, they are two very different products, there are differences in many ways, the following specific for everybody introduced galvanized steel pipe and welded steel pipe. Galvanized steel pipe can be used in the pipeline laying of lighting, power, telephone, fire protection and other systems in new construction and transformation projects (JDG, KBG, thin-wall galvanized steel pipe), can be laid in the open and dark, can be laid in the wall, can also be laid in the ceiling.Not suitable for corrosive sites and explosive dangerous environment.Welded steel tubes with hot dip or electric galvanizing coating on the surface of galvanized steel tubes. 

Galvanized Steel Pipe

Galvanizing can increase the corrosion resistance of steel pipes and prolong their service life. Galvanized steel pipe USES is very wide, in addition to a general low pressure fluid such as water, gas, oil line pipe, also used as oil industry, especially the ocean oil field oil well pipe, oil pipe, chemical coking equipment of oil heater, the condensing, exchange of coal distillation wash oil cooler for tube, and trestle pile, mining tunnel supporting frame tube, etc. Hot dip galvanized steel pipe is widely used in various modern manufacturing industries.

Galvanized welded steel pipe supplier china tells you the difference between the two products.

Welded Steel Pipe

Difference one: mode of production

At the time of production, the difference is particularly obvious, because made of galvanized steel pipe is need to slowly dissolve, and welded steel pipe is welded directly, so the welding steel pipe at the time of production is more convenient, galvanization steel tube is more time-consuming, but it is precisely because the difference between this galvanized steel pipe and welded steel pipe, so cause they are quite different in other ways too.

Difference two: appearance

We know their production mode is quite different, which leads directly they also have great differences in appearance, everybody can easily tell the difference between galvanized steel pipe and welded steel pipe, galvanized steel pipe appearance often have a layer of metal layer, as a whole is very smooth and uniform color, but the welded steel pipe because at the time of production is directly rough, so it looks not nice.

Difference three: price

In view of these two different types of pipes, there are great differences in the production methods and appearance, so their price differences are directly caused. Galvanized steel pipes are more beautiful and time-consuming to make, so the price of pipes of the same specification is much more expensive than that of welded steel pipes.The difference between galvanized steel pipe and welded steel pipe directly affects their social status, if it is to buy the building materials of these two materials, so in the eyes of delicate people, often prefer galvanized steel pipe, welded steel pipe is suitable for ordinary families.

The Introduction Of Welded Pipe

Galvanized welded steel pipe supplier china to share with you: Welded steel pipe, also known as the welded pipe, is made of steel plate or strip after the curly forming of the welded steel pipe, generally fixed feet 6 meters.Welding steel tube production process is simple, high production efficiency, variety specifications, equipment investment, but generally less than seamless steel tube strength.

With the rapid development of high quality strip rolling production and the progress of welding and inspection technology, the weld quality is constantly improving, the variety and specification of welded steel pipe is increasing, and in more and more fields instead of seamless steel pipe.

Classification by production method: process classification - arc welding pipe, resistance welded pipe, (high frequency, low frequency) gas welded pipe, furnace welded pipe.The smaller diameter welded pipe adopts straight seam welding, while the larger diameter welded pipe adopts spiral welding.According to the shape of the end of the steel pipe, it can be divided into circular welded pipe and special-shaped (square, rectangular, etc.) welded pipe.According to the different materials and USES are divided into mine fluid transport welded steel pipe, low pressure fluid transport with galvanized welded steel pipe, belt conveyor roller welding steel pipe.According to the size table of current national standard, sort by outside diameter * wall thickness from small to large.

It is divided into general welded pipe, galvanized welded pipe, oxygen-blown welded pipe, wire sleeve, metric welded pipe, idler pipe, deep well pump pipe, automobile pipe, transformer pipe, welded thin-walled pipe, welded special-shaped pipe, scaffold pipe and spiral welded pipe.

General welded pipe: general welded pipe to transport low pressure fluid.Made of steel Q195A, Q215A and Q235A.Other soft steels that are easy to weld can also be used.The steel pipe should be tested by water pressure, bending, flattening, etc., which requires certain surface quality. The delivery length is usually 4-10m.The specification of welded pipe with nominal diameter (mm or in) nominal diameter and the actual different, welded pipe according to the specified wall thickness of ordinary steel pipe and two kinds of thickened steel pipe, steel pipe according to the end of the form and with thread and without thread two kinds.

Galvanized welded steel pipe: to improve the corrosion resistance of steel pipe, the general steel pipe (black pipe) is galvanized.Galvanized steel pipe is divided into hot dip galvanized and electric galvanized two kinds, hot dip galvanized galvanized layer thick, low cost of electric galvanized.

Oxygen-blowing pipe: used for oxygen-blowing pipe in steelmaking, generally used for small-diameter welded steel pipe, 8 kinds of specifications from 3/8 "to 2".Made of 08, 10, 15, 20 or q195-q235 steel strip.For corrosion prevention, some are aluminized.

Wire bushing: also known as ordinary carbon steel welded steel pipe, used in concrete and various structure power distribution projects, the commonly used nominal diameter from 13-76mm.Wire sheath tube wall is thin, most of the coating or galvanized after use, the cold bending test is required.

Metric welded pipe: specification for seamless pipe form, welded steel pipe with outer diameter * mm wall thickness, welded with ordinary carbon steel, high quality carbon steel or general low alloy steel with tropical, cold zone, or after tropical welding by cold dialed method.Metric welded pipes are divided into general energy and thin wall, commonly used as structural parts, such as transmission shaft, or fluid transport, thin wall for the production of furniture, lamps and lanterns, to ensure the strength of steel tube and bending test.

Idler tube: used for belt conveyor idler welding steel tube, generally made of Q215, Q235A, B and 20 steel, diameter 63.5-219.0mm.There are certain requirements on the bending degree of the pipe, the end face should be perpendicular to the center line, and the ellipticity.

Transformer tube: used for making transformer heat exchangers and other heat exchangers, made of ordinary carbon steel, which requires flattening, flaring, bending and hydraulic tests.Steel tube is delivered with fixed or double ruler, there are certain requirements on the bending of steel tube.

Special-shaped pipe: square pipe, rectangular pipe, cap pipe, steel pipe for door and window, welded by common carbon structure steel and 16Mn steel belt, mainly used for agricultural machinery components, steel window and door.

Welded thin wall tube: mainly used for making furniture, toys, lamps, etc.In recent years, the thin wall pipe made of stainless steel belt is widely used, such as high-grade furniture, decoration and fence.

Spiral steel pipe: the spiral steel pipe is made of low carbon structural steel or low alloy structural steel with a certain spiral Angle (called forming Angle) and then welded together to make the pipe. It can be used to produce large diameter steel pipe with a narrow strip.Spiral welded pipe is mainly used for oil and natural gas pipeline, its specification is expressed by outer diameter * wall thickness.Spiral welded pipe has single-side welding and double-side welding, welded pipe should ensure that hydraulic test, weld tensile strength and cold bending performance to meet the requirements.

What are the methods of straight seam steel except embroidery

In the construction process of oil and gas pipelines, the surface treatment of straight seam steel pipe is one of the key factors to determine the service life of pipelines. According to the research of professional institutions, the anti-corrosion coating life depends on coating type, coating quality, construction environment and other factors, the impact of surface treatment on the anti-corrosion coating life of straight seam steel tube accounts for about 50%. Therefore, the surface treatment method of straight seam steel tube should be continuously improved in strict accordance with the requirements of the anti-corrosion coating specification on the surface of straight seam steel tube.

Straight Seam Steel Pipe

In addition to the straight seam steel tube embroidery methods mainly have the following:

1, clean

The use of solvent, emulsion cleaning of steel surface, in order to achieve the removal of oil, grease, dust, lubricants and similar organic matter, but it can not remove the rust on the surface of steel, oxide, welding, and so on, so only as an auxiliary means in the prevention work.

2, pickling

Generally with chemical and electrolysis two methods to do pickling treatment, pipeline corrosion only chemical pickling, can remove the oxide, rust, old coating, and sometimes can be used as a sandblasting after the rust treatment.Although chemical cleaning can make the surface reach a certain degree of cleanliness and roughness, but the anchor grain is shallow, and easy to cause pollution to the surrounding environment.

3. Tool derusting

Mainly use steel wire brush and other tools to polish the steel surface, can remove loose oxide, rust, welding slag and so on.Manual tool derusting can reach Sa2 level, power tool derusting can reach Sa3 level, if the steel surface attached to a firm iron oxide, tool derusting effect is not ideal, can not reach the anti-corrosion construction requirements of anchor depth.

After spraying, not only the physical adsorption on the surface of the pipe can be expanded, but also the mechanical adhesion between the coating and the surface of the pipe can be enhanced.Therefore, spray rust removal is the ideal way of pipeline corrosion removal.Generally speaking, shot peening and derusting are mainly used for internal surface treatment of pipes, while shot blasting and derusting are mainly used for external surface treatment of straight seam steel pipes.In the production process, relevant technical indicators of derusting should be strictly required to prevent secondary damage to the straight seam steel pipe caused by operational mistakes. The straight seam steel pipe will be smoother in appearance compared with the straight seam steel pipe before the elimination of embroidery. The elimination of embroidery of straight seam steel pipe is a frequently used technology in the steel pipe industry.

Our company provides high quality customized construction pipe and welded steel pipe, if you have any demand for our products, please feel free to contact us

How to Select Good Pipe?

Up to now, our company has produced a lot of products about pipes. Such as: Straight seam steel pipe, Round SSAW Carbon Steel Pipe, High quality custom Construction Pipe. Our products have met with a warm reception in many country and obtained a greet deal of favorable comments from customers. Therefore, we have a lot of products for sale.

First of all, Straight seam steel pipe is a steel pipe whose weld seam is parallel to the longitudinal direction of the steel pipe. It is usually divided into metric welded steel pipes, welded thin-walled pipes, transformer cooling oil pipes, etc. The straight seam welded pipe has the advantages of simple production process, high production efficiency, low cost and rapid development. The strength of spiral welded pipe is generally higher than that of straight welded pipe. It can be used to produce welded pipe with larger pipe diameter with narrower blank and welded pipe with different pipe diameters with blank of the same width. However, compared with the straight seam pipe with the same length, the weld length increases by 30-100%, and the production speed is lower. Straight-seam steel pipe English general welded pipe: general welded pipe is used for conveying low-pressure fluid. Made of q195, q215a, q235a steel and q235b carbon. It can also be made of 0317 standard model 6012 and 755 mild steel which is easy to weld. Water pressure, bending, flattening and other experiments shall be carried out on steel pipes, which have certain requirements on surface quality. Usually, the delivery length is 4-10m, and regular delivery (or double-length) is required. The specification of welded pipe is expressed by nominal diameter (mm or inch). The nominal diameter is different from the actual one. Welded pipe has two types of common steel pipe and thickened steel pipe according to the specified wall thickness. Steel pipe has two types of threaded and threaded pipes according to the pipe end form.

Carbon steel pipes as Round SSAW Carbon Steel Pipes are divided into hot rolled and cold rolled (drawn) steel pipes. Hot rolled carbon 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. Cold-rolled (drawn) carbon steel pipes include carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless steel pipes, petroleum cracking pipes and other steel pipes in addition to general steel pipes, low and medium pressure boiler steel pipes, high pressure boiler steel pipes, alloy steel pipes, stainless thin-walled steel pipes and special-shaped steel pipes. The outer diameter of the hot rolled seamless pipe is generally larger than 32mm, the wall thickness is 2.5-75mm, the outer diameter of the cold rolled seamless pipe can reach 6mm, the wall thickness can reach 0.25mm, the outer diameter of the thin wall pipe can reach 5mm, the wall thickness is smaller than 0.25mm, and the cold rolling has higher dimensional accuracy than the hot rolling. General carbon steel pipe: it is made of high quality carbon-bonded steel 16mn, 5mnv and other low alloy structural steel such as 10, 20, 30, 35, 45 and other high quality carbon-bonded steel or alloy steel such as 40cr, 30crmnsi, 45mn2, 40mnb by hot rolling or cold rolling. Seamless pipes made of low carbon steel such as 10 and 20 are mainly used for fluid transmission pipelines. Seamless tubes made of medium carbon steel such as 45 and 40cr are used to make mechanical parts, such as mechanical parts of automobiles and tractors. Generally, carbon steel pipes shall be tested for strength and flattening. Hot rolled steel pipes shall be delivered in hot rolled state or heat treated state. Cold rolling is delivered in heat treatment.