分类：NEWS

Black steel pipe as one common member of structural steel pipes has been widely used in greenhouse projects for many years due to its strength and stability in use. Furthermore, black steel pipe’s tensile strength makes it a better choice for people to use in in greenhouse projects today.

Greenhouse frames can be constructed of several different types of materials. If you’re building a greenhouse, choosing which type of frame to use will be one of your first decisions. And it is obviously important to select a proper type of pipe frame to supports the entire greenhouse structure. In general, steel, available in many forms for intended purposes other than greenhouse building, can be adapted to many shapes and sizes of greenhouses. Steel frames are the most commonly used type of frame. Steel frames are used in greenhouses ranging from tiny hobby houses to huge multi-bay commercial greenhouse complexes. Compared with galvanized steel pipe, black steel pipe doesn’t have a corrosion resistant layer but its high fire resistant performance plays an important role in fire sprinkler system.

In most cases, steel frames in greenhouse projects are usually constructed of black steel pipe. And as black steel pipe is prone to rust over time, it’s a good idea to paint the steel frame with a white paint. In addition to protecting the frame, the white paint will help to reflect a bit of additional light into the interior of the greenhouse. Cold rolled steel pipe is commonly used for steel frame in greenhouse project in recent years, which has an improved surface finish and tighter tolerances and cold rolled steel pipe is more precise dimensionally because the cold rolled steel has already gone through the cooling process, which help it closer to the finished dimension while the hot rolled steel forms the finished product looser tolerances than the original material.

With regard to steel pipe price in the market, black steel pipe are relatively cheaper than other popular steel pipes in the steel pipe market. Black steel pipe generally has the rational cost effective in the market. However, unlike other structural steel materials, galvanized steel is immediately ready for use when it is delivered. No additional preparation of the surface is required, no time-consuming inspections, additional painting or coatings are needed. Once the structure is assembled, contractors can immediately begin the next stage of construction without having to worry about the galvanized steel materials. If you choose a galvanized pipe, you can avoid the cost of maintaining and replacing corroded pipes. With galvanized pipe, your pipes can last a lot longer than black steel pipe, which will save you a lot of money in the project.

As it is well acknowledged, steel conduit provides very good protection to enclosed conductors from impact, moisture, and chemical vapors. For certain conditions, wiring systems in buildings may be subject to frequent alterations, and frequent wiring changes are made simpler and safer through the use of steel conduit, as existing conductors can be withdrawn and new conductors installed, with little disruption along the path of the conduit. In the practical applications, how to choose the proper type of steel pipe for the installation indoors or outdoors, in dry or wet locations, exposed or concealed atmospheric conditions, mainly requires certain professional knowledge as well as other considerations before your project. Today, we would like to talk about why to use galvanized steel pipe in your wire system.

Galvanized steel pipe generally has the rational cost effective in the market. Compared with other typical steel pipe coatings, such as specialized painting and powder coating, galvanization is much more labor-intensive, resulting in a higher initial cost for contractors. Besides, due to its durability and anti-corrosive properties, galvanized steel pipe can recycled and reused, which to some degree save a lot of money during the post maintenance work. Hot dipped galvanized pipe has been considered popular a lot among many users today. For one thing, the galvanization process protects the steel from rusting damage that can occur during transportation, installation and service. The zinc layer on the surface of pipe can form a barrier protection for steel products to extend the service life in applications. For the other thing, this layer is also resistant to wear and scratches, which makes the steel look more attractive. Furthermore, Testing and studies have revealed that the average life expectancy for galvanized steel used as a typical structure material is well beyond 50 years in a rural environment and 20-25 years or more in an extreme urban or coastal setting. In that regard, contractors can confidently use this product in project. With the layer of protection, pipes can be used in outdoor areas, and can withstand the harm from some of the environmental effects.

Galvanized rigid steel conduit is the heaviest weight and thickest wall of steel conduits. In the practical applications, steel pipe manufacturers suggest that how to choose the proper type of steel pipe for the installation indoors or outdoors, in dry or wet locations, exposed or concealed atmospheric conditions mainly requires certain professional knowledge as well as other considerations before your project. In addition, GRC conduit is a raceway solution which allows for future wiring changes and delivers remarkable mechanical protection to conductors and cables.

In the current steel market, with a new round of galvanized steel pipe prices rise, it means galvanized steel pipe has become much more popular with people in life today. Galvanized steel pipe generally has the rational cost effective in the market. Compared with other typical steel pipe coatings, such as specialized painting and powder coating, galvanization is much more labor-intensive, resulting in a higher initial cost for contractors. Besides, due to its durability and anti-corrosive properties, galvanized steel pipe can recycled and reused, which to some degree save a lot of money during the post maintenance work.

In the steel pipe industry, pre galvanized steel pipe and hot dipped galvanized steel pipe are the two common types of galvanized steel pipe widely used in various applications so far. Roughly speaking, hot-dipped galvanization is a form of galvanization. It is the process of coating iron and steel with a layer of zinc by immersing the metal in a bath of molten zinc at a temperature of around 840 °F (449 °C). When exposed to the atmosphere, the pure zinc reacts with oxygen to form zinc oxide, which further reacts with carbon dioxide to form zinc carbonate, a usually dull grey, fairly strong material that protects the steel underneath from further corrosion in many circumstances. As zinc is a kind of toxic substance, it will produce a certain pollution and damage to the human body and the environment. Therefore, the increase in the cost of environmental protection is one of the important reasons for a higher steel pipe price in the current steel pipe market.

As a rule, there are four steps for galvanizing process in a mill as follows:
•Pre-inspection – where the fabricated structural steel is viewed to ensure it has, if necessary, the proper venting and draining holes, bracing, and overall design characteristics necessary to yield a quality galvanized coating
•Cleaning – steel is immersed in a caustic solution to remove organic material such as grease and dirt, followed by dipping in an acid bath (hydrochloric or sulfuric) to remove mill scale and rust, and finally lowered into a bath of flux that promotes zinc & steel reaction and retards further oxidation of the steel… (steel will not react with zinc unless it is perfectly clean)
•Galvanizing – the clean steel is lowered into a kettle containing 850 F molten zinc where the steel and zinc metallurgically react to form three zinc-iron intermetallic layers and one pure zinc layer
•Final inspection – the newly galvanized steel is sight-inspected (if it looks good, it is), followed up by measurement of coating thickness with a magnetic thickness gauge

Dong PengBoDa Steel Pipe Group is one of famous steel pipe manufacturers in China. We are committed to producing various types of steel pipe for your choice in applications. If you have any need, please contact us.

Steel gi pipe, somewhat is considered a superior product in a couple of practical applications, for it extends the service life and has a relatively low cost in use. As a rule, welding of China galvanized steel pipe is done almost exactly the same way as welding of the bare steel of the same composition. The welding industry recognized fifty years ago that welds on galvanized steel and welds on uncoated steel are of comparable strength if the quality of the welds is comparable. In recent years, more and more steel pipe manufacturers begin to pay much attention to the improving the welding technology involving weld toughness, porosity control, weld appearance, restoring corrosion resistance and other issues in a mill.

The difference between welding galvanized steel pipe and welding uncoated steel one is a result of the low vaporization temperature of the zinc coating. Zinc melts at about 900˚F and vaporizes at about 1650˚F. In addition, when it comes to hot dipped galvanized steel pipe, it can not be denied that when zinc vapor mixes with the oxygen in the air, it reacts instantly to become zinc oxide on the surface of pipe to protect steel products from rusting in use. As a rule, welding exposes everyone to similar hazards in most of cases. General hazards of welding include impact, penetration, harmful dust, smoke, fumes, heat and light radiation. Welding “smoke” is a mixture of very fine particles (fumes) and gases. Many of the substances in the smoke can be extremely toxic. The intense heat of welding and sparks can cause burns. Eye injuries have resulted from contact with hot slag and metal chips. The intense light associated with welding can cause eye damage. Ultraviolet light from an arc can cause “welder’s flash” and also skin burns. There is also a danger of electric shock. If combustible or flammable materials are nearby, the heat and sparks produced by welding can cause fires or explosions. The use of compressed gas cylinders poses some unique hazards to the welder.

In certain cases, even though the remaining zinc continues to provide some protection to the zinc-free areas, the appearance is poor, and the zinc-free areas will rust when exposed to the environment. In some cases, paints are properly applied to effectively restoring full corrosion protection to the weld areas. Generally these paints are available in either spray cans or in containers suitable for brush or spray application. However, for certain cold rolled steel pipes, for instance, they exhibit special problems when welding, mostly due to the unevenness of the coating. Edges and corners typically right where welding is being done frequently have very thick, heavy zinc deposits which may interfere with welding much more than where the zinc has been applied evenly. In addition, hot dipped products typically have rough finishes which do not top coat very well, and top coating, especially with powder topcoats, has to be done within 48hours to avoid difficulty with white rust formations.

Technically, steel pipes are long, hollow tubes that are used for a variety of purposes. They are produced by two distinct methods which result in either a welded or seamless pipe. In both methods, raw steel is first cast into a more workable starting form. It is then made into a pipe by stretching the steel out into a seamless tube or forcing the edges together and sealing them with a weld. As is known to all, the main advantage of seamless pipe is the elimination of seam-related defects. However, due to its higher cost of pipe manufacturing, the steel pipe price is relatively high by comparison with welded pipe.

Galvanized steel pipe generally has the rational cost effective in the market. Compared with other typical steel pipe coatings, such as specialized painting, powder coating, is much more labor-intensive, resulting in a higher initial cost for contractors. Besides, due to its durability and anti-corrosive properties, galvanized steel pipe can recycled and reused, which to some degree save a lot of money during the post maintenance work. Hot dipped galvanized pipe has been considered popular a lot among many users today. For one thing, the galvanization process protects the steel from rusting damage that can occur during transportation, installation and service. The zinc layer on the surface of pipe can form a barrier protection for steel products to extend the service life in applications. For the other thing, this layer is also resistant to wear and scratches, which makes the steel look more attractive.

Seamless pipe has been manufactured since the 1800’s. As a rule, according to the different production methods, seamless steel pipe has four major categories: hot rolled seamless pipe, cold rolled seamless pipe, cold drawn seamless pipe, extruded tubes. The production process for seamless pipe generally starts by steel pipe manufacturers from heating a metal billet temperature. The red hot billet is rotated and drawn by rolls over a piercing rod or mandrel. The action of the rolls causes the metal to flow over and about the mandrel to create a hollow pipe shell. The shell is then moved forward over a support bar and is hot rolled or cold rolled in several reducing/sizing stands to obtain the desired wall thickness and diameter. In addition, the hot-extrusion method involves working in the compressive-stress field. Therefore, it is characteristic of this method that high-alloy steel pipe of low deformability can be produced, as well as heavy-wall and large-diameter pipes.