The Developing Ttrend of DSAW Steel Pipe

The developing trend of  DSAW steel pipe in the future:

1. in terms of the onshore gas,with the large diameter LSAW steel pipe, its single-tube gas transmission capacity could reach the level of 50 billion cubic meters / year, pipe diameter can reach ф1422mm, steel grade achieve X80, and gas transmission pressure can reach 12MPa;
2. in terms of the ocean steel pipe, the gas pipeline develops towards the direction of deep-sea pipeline (> 1500 meters), marine structural tube towards the direction of high-intensity, large wall thickness, for example ф610mm×31.8mm, X65 grade;
3. in terms of business management, plate and pipe integration (steelmaking - Continuous Casting - rolled plate - pipe manufacturing) is the future development trend, for example in Japan and India plate and strip production line is always equipped with a welded steel pipe unit;
4. entering the market of high-grade structural tubes, this is an important question to be considered by the LSAW steel pipe production line manufacturer when deploying the device, so it is necessary to set the preheating device before pre-welding, or set the heat treatment process and so on;
5. in marketing, in addition to oil and gas pipelines, there is slurry pipelines;
6. anti HIC tube and anti deformed tube are with a considerable market prospect, can be used to transport acid gases and improve the ability against external environmental damage in harsh geological conditions (landslides, mudslides, earthquakes).

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IPN8710 Corrosion Coating

When the corrosion of steel in more types of media, such as acids, alkalis, salts, oxidants and water vapor, etc., the coating must be chemically inert, acid salt corrosion, the coating should be compact structure, water permeability, adhesion, tough fullness. Such cases for IPN8710 corrosion.

water supply carbon steel pipe within the wider variety of corrosive media, there is acid, alkali, salt, oxidizing and water vapor, etc., coatings must be chemically inert, acid and alkali salt corrosion, the coating should be compact and water permeability, strong adhesion , tenacity fullness. 
IPN8710 primer: from polyurethane polyethylene, modified epoxy resin, non-toxic anti-rust pigment, filler, additives such as composition, room temperature curing to form interpenetrating networks, film structure, dense, acid, alkali, salt, rust-proof performance, strong adhesion. 
IPN8710 finish: from epoxy, rubber and resin-modified, non-toxic anti-rust pigment, filler, additives etc.. Excellent chemical resistance, non-toxic, anti-microbial erosion. 

Uses: IPN8710 primer for water supply coating steel pipe corrosion grounding coating; 
Diameter range is Φ325 - Φ2220
IPN8710 finish for water supply pipeline wall corrosion finish. 

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Introduction of DSAW Steel Pipe

Double Submerged Arc Welded DSAW steel pipe is available in straight and spiral welded formats and used in a variety of applications. The submerged welding process protects the steel from contamination of impurities in the air. Both inside and outside welds are performed.

DSAW steel pipe can be specified in very large diameter and to exact inside or outside dimensions. Spiral Welded steel pipe is distinguished by the manufacturing process that results in a spiral DSAW seam the length of the pipe to lengths of 155 feet. 

The manufacturing of Double Submerged Arc Welded steel pipe involves first forming steel plates into cylindrical shapes. Then the edges of the rolled plate are formed so that V-shaped grooves are formed on the interior and exterior surfaces at the location of the seam. The pipe seam would then be welded by a single pass of an arc welder on the interior and exterior surfaces. The welding arc is submerged under flux. What can be known as an advantage of this process is that welds would penetrate 100% of the mild steel pipe wall and produce a very strong bond of the pipe.

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Quality Control Measures of 45# Structural Steel Pipe

From the mechanism, it is generally believed the non-metallic inclusion in billet can destroy the continuity of 45 # structural steel pipe and density, serious mixed even within 45 # steel structure stratification. Another think is hydrogen induced cracks that caused by hydrogen gathered in steel metal internal gas pressure is too high, form white spots inside the mild steel pipe billet, crack extension occurred in the process of rolling in, eventually forming delamination defects. In addition, the two-high skew rolling perforation of non-uniform deformation of stress more than plastic strength can also cause delamination.

In smelting under the condition of strict control, more than a third case, the control measures are as follows:

1, improve the structure of 45 # steel plastic toughness

Improve the cleanliness of molten steel, reduce harmful inclusions; Increase the continuous casting slab equiaxed crystal ratio, reduce center segregation and loose; A reasonable cooling system is adopted to avoid crack in slab internal appear; To logoff slab or rolling billet adopts the slow cooling process, reduce internal stress, so as to ensure the tube billet and finished product structure of 45 # structural steel pipe and mechanical properties meet the requirements of technical standard.

2, the reasonable control of heating temperature

By measuring thermoplastic curve, selecting the best heating temperature. Tube billet heating also note there is enough time of heat preservation, in order to reduce the deformation force and improve the structure of 45 # steel plastic toughness.

3, to reduce the roll speed

Roll speed is the key parameter of perforation technology, in the process of roll speed changes from low to high, there is a start to appear a layered critical roll speed. Roll speed is low, the pipe to form pore space; Pipe and roll speed high, 45 # steel tube structure is easy to form a hierarchical defects. 45 # carbon steel pipe. structure in order to eliminate the tube billet and delamination defects, should reduce the roll speed began to layered below critical roll speed.

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Quality Control Measures for Structural Steel Pipe Column

Quality control measures for  structural steel pipe column:

1) good quality raw materials in the first place, the inspection qualified rear can formally enter the construction site, Q345 steel tube structure, resolutely put an end to the use of unqualified steel.

2) the second is the management of the welding material. Check whether welding materials for qualified products, storage and baking system is executed, the issue of whether welding materials surface clean without rust, electrode coating in good condition, do you have any mildew.

3) is the welding area cleaning management again. Check the cleaning quality of welding area, can not have water, oil, rust and oxidation film such as dirt, it's important for the prevention of external welding defects in function.

4) choosing the appropriate welding method, structural steel pipe, should be carried out to test welding, after welding principle.

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Three Tips for API Steel Pipe to Insure Security

When you are going to decorate your brand new house, it is important to make it beautiful and elegant. However, most of the house do not have the cognition that security of your house is essential as well. In order to protect your properties, it is needed to purchase the materials that are in safe for building and the security system. One of them, steel will be widely used during the constructing process. As you may have known that, structural steel pipe that is made of steel can resist on creating rust. Here are some tips for you to buy the API steel pipe, three main points that you should take into account.

Finding out a dependable supplier who provides authorized API steel pipe is your first step. You do not have to hesitate about choosing those lower price pipes, since those suppliers are using raw materials in these pipes. It must be unqualified produced and won't stay long. Some customers are likely to fascinated by the initial expense, but they will pay for it soon because those unqualified have to be alternated. Therefore, you would better select a reliable supplier on buying API pipes. Once you have a relationship with one company, we suggest you continuing on choosing this company rather than change to another one.

API mild steel pipe can be used in many applications, such as delivering industrial material for manufacturing. Thereby, you need to make sure your own purpose and requirements. This is one of the most important steps of the whole step. Water, oil and gas are the normal stuff, they are safe. But when it comes to the dangerous materials, then you have to take this into consideration. Some toxic liquid may have chemistry reaction with the pipe. It would lead to the oil leak or gas leak as time goes by, even sometimes it is bad for the environment protection. Residential usage and industrial purpose are totally different.

Last but not least, API steel pipes are widely used in business and public applications. More and more people tend to choose a reasonable price at manufacturing process out of saving money. Brand is another way to promise a good quality for the pipes. Thereby, department store or online shopping mall can provide you lots of choice. But you have to remember, know what you want, then you can buy what you want. Do not hesitate about choosing costly API steel pipes, since you never know how long it will work for you. No matter what kind of API pipes you will tend to select in constructing, quality and security always should be put on the first place, then you can think about the price regard. To make sure that these pipes can keep on running, quality is needed for the foundation. Sometimes, money is less important than the using experience, so keep choosing those you think it can work for a long term. Hope you will find out your knowledge about API carbon steel pipe.

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Welded Steel Pipe for Transporting Low-Pressure Fluid

Welded steel pipe is using the materials, such as steel belt or plate stuff, as the steel pipe joint on the surface, which makes the welded can bend into round or triangle shape. That makes the tube shape. Welded steel pipe is formed in 1.0m for the pipe diameter and more than 10mm thick from the steel plate. In the industrial field, we can see lots of application of this welded steel pipe is being used, such as shipment delivery and the basic structural materials for building and factories, etc. Therefore, lots of customers can are satisfied in meeting this pipe. They can ask for special requirements on the quality, specifications and even the size. More originally, we are using this pipe in transporting gas, liquid and even the heating. We are using them in delivering water through the country and providing necessity for the resident.

We can divide the welded structural steel pipe into three main types, the high, the low and the gas tube. Those are evidenced by their different methods. Moreover, we still can see some minority types, such as the furnace pipe.

Making the welded tubes is simpler than other types, like the seamless steel pipes and mild steel pipe. Thereby, the manufacturer has high efficiency. Since one hundred year ago, the development of the kind of pipes makes it possible to improve its quality and specifications like the lengths and diameters. Flat products such as plate and sheet are the original materials in making welded tubes. After certain degree compression and temperature, it can make it into desired shape. Basically, manufacturers would like to make it round shape, since it is good for transporting, especially for those low-temperature liquid. Once this outer shape is made, weld joint are used to combine each part together. High energy are needed at the same time, since this process need power to squeeze and form. Customers and buyers are provided more choices as the increasing number of pipes. According to different making process, this type can be divided into two main forms---the spiral welded pipe and longitudinal pipe. For the advantages, simple procedure is the first one, then various types are the second since customers can choose their specific types. What's more, equipment investment is quite low, while the general strength less than seamless steel tubes.

In the case of high pressure and vibration, steel pipe are especially helpful since their resistance. They can resist rust, corrosion and fire and therefore, apart from carrying liquid and gas, they can also be applied for fire sprinkler system. Carbon steel pipe is under the imposition of government and the quality of the pipe must meet the specified standard. Different pipeline application has different regulations; you need to apply the stringent rules to make sure a safe criterion. Qualified steel pipe works wonder and save trouble to the project and less maintenance in later use. We suggest all the customers to take every important details into consideration before purchasing the pipe.

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