What are the types and uses of steel pipes? Steel pipe specification and size comparison table

Acura steel pipe, as its name implies, is a pipe made of steel material, which can be simply divided into seamless steel pipe and welded steel pipe. Seamless steel pipes can be divided into cold-rolled steel pipes and hot-rolled steel pipes, and welded steel pipes can be divided into straight-seam steel pipes and spiral steel pipes. Steel pipes can be used in building materials, pipelines, engineering structures and other fields. Different application fields have different requirements for steel pipe specifications, so pay attention when buying or renting steel pipes. Generally, steel pipes bought back need to be processed before they can be used. Next, we will learn about the steel pipe construction and processing technology with Maigoo.

Brief introduction of steel pipe steel pipe is an economical steel. There are many kinds and specifications of steel products, and their performance requirements are also different. Steel pipes can be used to transport fluids and powdery solids, exchange heat energy, and manufacture mechanical parts and containers. Using steel pipes to make grids, columns and mechanical supports of building structures can reduce weight, save 20-40% metal and realize industrialized mechanized construction. Using steel pipes to make highway bridges can not only save steel and simplify construction, but also greatly reduce the area coated with protective layers and save investment and maintenance costs.

The types of steel pipes are divided into 1 and seamless steel pipes according to production methods.

Seamless steel pipe is made of a whole round steel, and there is no weld on the surface. Its types include hot-rolled steel pipe, cold-drawn steel pipe, precision steel pipe, thermal expansion pipe, cold spinning pipe and extrusion pipe.

2, welding steel pipe

Welded steel pipe is a steel pipe welded by butt seam or spiral seam of steel plate rolled into a pipe, which can be simply divided into straight seam steel pipe and spiral steel pipe.

According to the material of steel pipes, steel pipes can be divided into carbon steel pipes, alloy steel pipes and stainless steel pipes. Carbon pipes can be divided into ordinary carbon steel pipes and high-quality carbon structural pipes. Alloy tubes can be divided into low alloy tubes, alloy structural tubes, high alloy tubes, high strength tubes, precision alloy (such as kovar alloy) tubes and high temperature alloy tubes.

According to the characteristics of coating and surface coating, steel pipes can be divided into coated steel pipes and uncoated steel pipes (also called black pipes). Coated steel pipes include galvanized pipes, aluminized pipes, chromium-plated pipes and aluminized pipes.

According to the cross-sectional shape, steel pipes can be divided into circular steel pipes and special-shaped pipes. Special-shaped steel pipes refer to various steel pipes with non-circular cross sections, such as square pipes, rectangular pipes, elliptical pipes, semicircular pipes, hexagonal pipes, pentagonal plum-blossom pipes, etc.

Steel pipes can be divided into pipeline pipes (water pipes, gas pipes, oil pipelines, etc.) according to their uses. ), thermal equipment pipeline (boiling water pipeline, superheated steam pipeline, etc. ), machinery industry pipes (aviation structural pipes, automobile axle pipes, transformer pipes, etc.). ), petroleum geological drilling pipes (petroleum drilling pipes, oil pipes, core pipes, etc.). ) and chemical pipelines (petroleum cracking pipelines and chemical equipment)

Steel pipe specifications What are the steel pipe specifications?

1, English standard

The symbol of English steel pipes is "DN" in capital, and the sizes are DN 15(4 pipes), DN20(6 pipes), DN25( 1 inch pipe) and DN32( 1 inch pipe).

2. International standards

International standard steel pipes are divided into several equal parts, with specifications such as 1/8, 1/4, 3/8 inches, which is equivalent to 1 responsible at ordinary times and 7 responsible. Table of steel pipe types and specifications >> Specifications and dimensions of steel pipe scaffolding > >

Calculation formula of steel pipe weight Different types of steel pipes have different weight calculation formulas. Next, Miago Bian Xiao briefly introduces several most common formulas for calculating the weight of steel pipes:

Weight of round steel (kg) =0.006 17X diameter x diameter x length;

Square steel weight (kg) =0.00785X side width x side width x length;

Weight of flat steel (kg) =0.00785X thickness x frame x length. Theoretical weight table of steel pipes >:>

How much does it cost to buy a steel pipe? The price of a new steel pipe is about 4000-5000 yuan per ton, and the price of second-hand old steel pipe is even cheaper, about 3000 yuan/ton. How many kilograms is the steel pipe one meter? This is related to the material and wall thickness of steel pipe. Ordinary steel pipes are about 2.5 kilograms per meter, and thickened galvanized steel pipes are about 3 kilograms per meter. In other words, buying a ton of ordinary steel pipes can process about 400 meters of steel pipes (not counting losses), while a ton of thickened galvanized steel pipes can process about 330 meters of steel pipes (not counting losses).

Key points of steel pipe purchase 1, depending on the appearance.

Choose steel pipes with uniform color, smooth inner and outer walls and no defects such as bubbles, depressions and impurities that affect surface performance.

2. Look at this sign

Information such as product name, nominal outside diameter and implementation standard number should be provided on the steel pipe, and the handwriting should be clear, and check whether the identification is consistent with the actual situation.

Step 3 look at the manufacturer

Steel pipe manufacturers are also a point that we should pay attention to when choosing steel pipes. You'd better choose products produced by well-known steel pipe factories, so that the quality is more guaranteed.

How to rent steel pipes? Generally, you should go to the special steel pipe rental market in shelf tube, or you can find a local construction team to rent it. When leasing, the required steel pipe size, weight and other specification information shall be provided.

What is the rental price of steel pipes? The rental price of steel pipes is related to the length and weight of steel pipes and the number of rental days. Generally speaking, the rental price of steel pipes per square meter (construction area) is about 30 yuan/day, and the rental fee of fastener materials is about one month 1000 yuan.

Tips from Maigoo Bianxiao: The above prices are for reference only, and the specific prices need to be determined after consultation with the local lessor.

Steel pipe construction steel pipe cutting method Large steel pipe piles need to be cut by sawing machine or automatic steel pipe cutting machine, which can keep the cutting surface flat and ensure the cutting quality. If you just adjust the angle slightly, you can cut it with a gas cutting machine.

How to weld steel pipes first requires cleaning paint, water and embroidery. At the joint of the steel pipe, then groove according to the wall thickness of the steel pipe, and then weld it with an electric welding machine. Pay attention to half welding. If the wall thickness is very thick, it is necessary to weld in layers, so as to ensure the welding quality.

Construction method of steel pipe frame: spring the thread on the pile cap, position the vertical pole → place the sweeping pole → fasten the vertical pole with the sweeping pole → install the sweeping pole and fasten it with the vertical pole and sweeping pole → install the first-step crossbar and fasten it with each vertical pole → install the first-step crossbar → install the second-step crossbar → add temporary diagonal braces, fix the upper end with the second-step crossbar → continue to install the crossbar to the designed height → add shear braces → spread scaffolding and fix protection.

There are two ways to bend a steel pipe into an arc, solid bending and empty bending. The actual bending is accurate, but the steel pipe at the elbow will be thinned due to stretching. Empty bending is the bending moment formed by one-way contact between the outer roller and the outer wall of the tube blank, which is generally used when real bending cannot be carried out.

The technological process of hot-rolled steel pipe processing: preparing blank pipe → selecting mandrel → coating lubricating paint on the inner surface of blank pipe → heating and expanding → heat treatment → physical and chemical detection → straightening → cutting head and tail → internal and external surface treatment → nondestructive testing → hydraulic test → surface protection → port processing → polishing and warehousing.

The processing flow of cold-rolled steel pipe is feeding → peeling → grinding → inspection → heating → perforation → cutting head → pickling, cleaning, neutralization → grinding → welding head → lubrication → cold drawing and cold rolling → heat treatment of finished products → straightening → cutting head → hydrostatic test → packaging and warehousing.

The process flow of welded steel pipe is as follows: plate rolling → cutting → forming → continuous automatic welding → setting cutting → degreasing → solid solution treatment → straightening → pickling → flat cutting → damage detection → water pressure test → pickling → finished product inspection side → marking, packaging and warehousing.

Cleaning and maintaining steel pipes with clear water Cleaning with clear water means washing the inner wall of steel pipes with clear water. This method is simple and cheap, but the net editor reminds everyone that the cleaning effect of this method is not obvious, because clean water can not completely remove impurities such as calcium and magnesium ion scale and biological mucus on the inner wall of steel pipe.

Chemical cleaning Chemical cleaning is a method of adding chemical reagents to water and then cleaning it. This method can effectively clean the calcium and magnesium ion scale on the inner wall of the steel pipe, but it will shorten the service life of the steel pipe, so it needs to be used carefully.

Physical cleaning is driven by compressed air, and the special projectile larger than the inner diameter of the pipeline is injected into the steel pipe through the launcher, so that it moves at high speed along the inner wall of the pipeline and fully rubs, thus achieving the effect of cleaning the inner wall of the pipeline. This method is widely used because of its obvious cleaning effect and basically no harm to the pipeline.

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