Comparison of Spiral Steel Pipe and Straight Seam Steel Pipe

Generally, there are two types of steel pipe in use. One is seamless steel and the other is spiral steel. Both of these types of steel pipe are used in many different applications. However, there are many differences between them. It is important to understand these differences so that you can make the best decision for your project.

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LSAW

Compared to straight seam steel pipe, spiral steel pipe and Casing Pipe has some advantages. For instance, its strength design is usually higher. It can resist radial and axial stress. It also has a higher impact toughness. In addition, it can be used to produce welded pipes of different diameters.

However, it has some disadvantages. For instance, the dimensional accuracy of the spiral pipe is not as accurate as that of straight seam steel pipe. Also, the wall thickness is smaller. This will change the hardness and rigidity of the pipe. In addition, the seam length is longer in the spiral steel pipe.

Furthermore, the load factor of the spiral weld is between two loads. This means that the load on the weld has the largest effect.

SSAW

SSAW (Spiral Submerged Arc Weld) pipe is a steel pipe manufactured by spiral submerged arc welding technique. It is formed by rolling a steel strip in the spiral direction, which leads to an open gap in the end. The pipe can be used for a variety of liquid conveyance applications, including oil, gas and water. It is less expensive than ERW (External Radiant Weld) pipe and has better strength and safety.

The SSAW spiral steel pipe is produced using an automatic double-wire double-sided submerged arc welding process. It has good performance in low-temperature corrosion resistance and high pressure resistance. The pipe is usually made of high quality carbon steel.

SSAW pipe has plastic plugs in both ends. This helps make the pipe flush at both ends. The SSAW pipe has a high compressive strength and long service life. It is commonly used for oilfield internal transportation pipeline.

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ERW

ERW and spiral steel pipe are two different types of steel pipes as well as Pipe fitting. They have different performance and quality, and are used for different purposes. However, both are made of steel and require welding. There are some differences in the manufacturing process as well as the raw materials. Consumers must be familiar with the differences and defects to make an informed decision.

ERW pipe has a much lower cost of manufacturing than spiral pipe. Most large scale spiral pipe factories produce only large diameter pipes. Consequently, the cost of manufacturing is about 15% higher for spiral pipe. This may be problematic in a situation where consistency in pipe performance is important.

Spiral steel pipe is usually produced from hot rolled strip coils. It has an unstable chemical composition and many internal defects. The internal weld height is very low. This makes it difficult to weld on the spot. It also has a low geometric accuracy.

Impact toughness

Compared to straight seam welded pipe, spiral welded pipe is better in impact toughness. However, its bearing capacity is not very obvious. Basically, its bearing capacity is related to the geometrical characteristics of the section and the mechanical properties of the steel.

In general, the bearing capacity of spiral welded pipe is higher than that of straight seam welded pipe. The bearing capacity is also related to the tensile strength and the elongation. The mechanical properties of steel have a direct relationship with the impact toughness of the pipe.

Spiral welded pipe has a high impact toughness and a low burst pressure. This is because the strength design of the pipe is generally higher than that of the straight seam welded pipe.

There are many different types of welded steel pipe. There are three main versions of welded steel pipe: the spiral welded pipe, the straight seam welded pipe, and the seamless steel pipe. Each type has its own advantages and disadvantages.

Residual stress

Whether you are looking for a spiral steel pipe or a straight seam steel pipe and ASTM A53 GR.B, you have to take into account the residual stress of the weld seam. In fact, the stress of the weld seam is equivalent to the base metal. However, it can be reduced by heat treatment and straightening.

The stress on the pipe wall can be divided into two types: axial stress and radial stress. Axial stress is the pressure produced by the working pressure inside the pipe. In addition, radial stress is the stress generated by the internal pressure.

There are two methods of welding: electric resistance welding and submerged arc welding. In general, submerged arc welding has longer welding time, and it requires a long time to ignite the arc.