A: Hot-dip galvanized (galvanizing), also known as hot-dip galvanized, it is an effective anti-corrosion of the metal, mainly used in various sectors of the metal structure facilities. The rust steel immersed in liquid zinc melt around 500 ℃, steel members attached to the surface of the zinc layer, which play the purpose of anti-corrosion. Hot-dip galvanizing process: finished of Pickling – washing – plus help the bath – drying – hanging plating – cooling – Pharmaceutical – cleaning – polishing – completion of the hot-dip galvanizing, hot dip galvanized by the ancient method of hot-dipped development come since 1836, France had been used in industrial hot dip galvanized, has a history of 140 years. However, the hot-dip galvanizing industry the past three decades along with the rapid development and large-scale development of the cold-rolled steel strip.
With the discovery of the industrial, hot dip galvanized products have been applied to many areas, hot-dip galvanized advantage of the anti-corrosion service life for a long time, to adapt to the the antiseptic treatment method widely been very popular. Been widely used in power tower, communication tower, railway, road protection, light poles, marine components, construction steel structure components, substation ancillary facilities, light industry.
Principle: hot dip galvanized iron pieces cleaned, and then the solvent treatment, drying after immersion in liquid zinc, iron, and the reaction of molten zinc alloyed zinc layer, its processes: the skim – washing – pickling – the fluxing – drying – hot-dip galvanized – separation – cooling passivation.
Galvanizing alloy layer mainly depends on the thickness of the silicon content of the steel chemical composition, the rough degree of the size of the cross-sectional area of the steel surface of the steel, the temperature of the zinc pot, the zinc immersion time, the cooling speed, and the cold deformation.
1, low-cost processing: hot-dip galvanized anti-rust lower cost than the cost of other paint coating;
2, Durable: standard hot dip galvanized rust thickness can be kept for 50 years or more in the rural environment, without having to patch; standard hot dip galvanized rust layer can be maintained for 20 years in the urban areas or offshore area, without having to patch;
3, good reliability: galvanized layer with steel is metallurgically bonded to become a part of the surface of the steel, and therefore more reliable coating persistent;
4, the toughness of the coating: zinc coating to form a special metallurgical structure, this structure can withstand transportation and use of mechanical damage;
5, full protective: plated parts each part can be plated with zinc, even in the recesses, sharp corners and hiding places can be fully protected;
6, saving time and effort: the the galvanizing process faster than other coating construction method, and can avoid the the brushing time required on site after installation
A: The advantages that steel offers to the construction sector have long been recognised by designers and specifiers. This is demonstrated by steel's market share which, over the past 15 years, has consistently been approximately 90% for single-storey industrial buildings and 70% for multi-storey non-residential buildings.The versatility of steel gives architects the freedom to achieve their most ambitious visions. Structural steel is an essential component of most stadia, shopping centres and commercial developments; steel cladding systems adorn iconic, landmark structures worldwide. Steel is one of the most sustainable construction materials. Its strength and durability coupled to its ability to be recycled, again and again, without ever losing quality make it truly compatible with long term sustainable development. Building owners value the flexibility of steel buildings, and the value benefits they provide, such as the light, open, airy spaces that can be created, making it ideal for modernisation, reconfiguring, extending or adapting with minimal disruption, and without costly and sometimes harmful demolition and redevelopment. Even without these benefits, steel is often the first choice on the basis of cost alone. Many of the advantages of steel construction are applicable to all building types and sectors.
Spiral welded steel pipe is made of the low-carbon carbon structural steel or low alloy steel strip according to the angle of the spiral line (called the forming angle) rolled into the tube, pipe and then welded together made, it can narrowstrip the production of large diameter steel pipe.Spiral welded pipe for oil and gas pipelines, its specifications OD * wall thickness.
Use OF Spiral Steel Pipe
Spiral welded side welding and double-sided welding, the pipe should ensure that the hydrostatic test, the weld tensile strength and cold bending performance to meet the requirements. Spiral welded steel pipe in China is mainly used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction. The transport of liquids: water supply, drainage. Gas transportation: gas, steam, liquefied petroleum gas. For the structure: for pipe piling for bridges; docks, roads, building structure, pipe, etc.
A: Tianjin CREDIT Import And Export Trade Co., Ltd.
A pipe formed by Electric Resistance Welding or ERW having one vertical seam without addition of any metal is called ERW pipes or tubes. It can be available in varied diameters and wall thickness. The sizes of pipes ERW pipes can range from 2 3/8 inch to 24 inch outer diameter and length can be over 100feet.
How EWR Pipe is made?
First the iron is flatten then place it into roller to form a tube and passes through a welding electrode made of copper disk which is connected to a revolving transformer. When the electrodes contact each side, the temperature is increased to the welding point. Once the tubes leaves the electrodes, the inside flash is removed by after colling the tube with a hammer and the outer flash by a cutting tool. The surface finish could be either bare or coated.
Qualities of ERW Steel Pipes:
Before reaching the market place, ERW steel tubes and pipes are routed through numerous tests including a hydro-test, an ultrasonic weld inspection, bevel check, micrometer check, straightness evaluation, and ring gouge to ensure its quality. The high performance ERW steel pipes and tubes possess better corrosion resistance, deformable and tougher.
Usage of ERW steel pipes & tubes:
These pipes are used in fencing, line pipes, oil country tubular, scaffolding, water and gas conveyance, structural, engineering purpose. There has been a tremendous increase in the production of ERW steel tubes due to growing demand in oil & gas industry, infrastructure and automobile usages.
Based on the end user customer’s requirement, ERW (electric resistance welded) steel pipes and tubes are available in various qualities, wall thicknesses, and diameters of the finished pipes. While manufacturing ERW steel pipes, only high-quality, continuous-cast, fully killed, control-rolled, fine-grain, low-carbon steel is used. High performance ERW steel pipes and tubes possess high strength corrosion resistance, high deformability, high strength and high toughness.
Before reaching the market place, ERW steel tubes and pipes are routed through numerous tests including a hydro-test, an ultrasonic weld inspection, bevel check, micrometer check, straightness evaluation, and ring gouge to ensure its quality. These pipes are used in fencing, line pipes, oil country tubulars, scaffolding, water and gas conveyance, structural, engineering purpose. There has been a tremendous increase in the production of ERW steel tubes due to growing demand in oil & gas industry, infrastructure and automobile usages.