Materials and uses of different straight seam steel pipes

As a widely used type of steel pipe,the weld of the straight seam steel pipe is consistent with the length of the steel pipe.It not only has a simple production process,high production efficiency and low cost,but also has a wide range of applications in many fields.This article will introduce the materials and uses of different straight seam steel pipes in detail,so that readers can better understand and choose the straight seam steel pipe that suits them.

Material classification of straight seam steel pipe

There are many types of materials for straight seam steel pipes,the most common ones are carbon steel,alloy steel and stainless steel.Different materials have different characteristics and uses,and are suitable for different working environments and needs.

1.Carbon steel straight seam steel pipe

Carbon steel straight seam steel pipe is mainly composed of amorphous carbon,lattice residual iron and other elements,of which the carbon content does not exceed 2.11%.The main materials include Q195,Q215,Q235B,etc.Carbon steel straight seam steel pipe is characterized by low price,good plasticity and good weldability,and is widely used in construction,bridges,petrochemical,electric power and other fields.

In the construction field,carbon steel straight seam steel pipes are often used for structural support,such as support pipes for bridges,docks,roads and building structures.Due to its strong bearing capacity and good torsional rigidity,it is suitable as a compression,compression bending and bidirectional bending member.In addition,carbon steel straight seam steel pipes are also used in low-pressure fluid delivery systems such as tap water projects and agricultural irrigation.

2.Alloy steel straight seam steel pipe

Alloy steel straight seam steel pipe refers to a steel pipe containing other alloy elements,such as chromium,molybdenum,manganese,nickel,etc.Alloy steel straight seam steel pipe is characterized by high hardness,high strength,good heat resistance and corrosion resistance,and is suitable for use in high temperature and high pressure environments.Common alloy steel straight seam steel pipes include 12Cr1MoV,15CrMo,etc.

Alloy steel straight seam steel pipes are widely used in high temperature and high pressure environments such as petrochemical,chemical,and electric power due to their excellent heat resistance and corrosion resistance.For example,in the oil refining process,alloy steel straight seam steel pipes can withstand fluid transmission under high temperature and high pressure to ensure the safe and stable operation of the system.In addition,alloy steel straight seam steel pipes are also used to manufacture high temperature equipment such as boilers and heat exchangers.

3.Stainless steel straight seam steel pipe

Stainless steel straight seam steel pipe is a kind of steel pipe with good corrosion resistance.Its main components are alloy elements such as chromium and nickel.Stainless steel straight seam steel pipe has the advantages of excellent corrosion resistance,high strength,high temperature performance,no rust,easy cleaning,etc.It is widely used in food,pharmaceutical,chemical and other fields.

In the food industry,stainless steel straight seam pipes are used to transport food-grade fluids such as milk and juice.Their corrosion resistance and easy cleaning ensure the hygiene and quality of food.In the pharmaceutical industry,stainless steel straight seam pipes are used to manufacture pharmaceutical production equipment such as reactors and conveying pipelines.Their corrosion resistance and high temperature performance ensure the production safety and stable quality of pharmaceuticals.

Classification of uses of straight seam steel pipes

The uses of straight seam steel pipes are very wide,covering low-pressure fluid transportation,structural support,gas transportation and many other aspects.The following will introduce the straight seam steel pipes for different purposes in detail.

1.Straight seam steel pipe for low pressure fluid transportation

Low-pressure fluid conveying straight seam steel pipe(GB/T 3092-1993)is also called ordinary straight seam steel pipe,commonly known as black pipe.It is mainly used to convey general low-pressure fluids such as water,gas,air,oil and steam heating.This kind of steel pipe can be divided into ordinary steel pipe and thickened steel pipe according to the wall thickness,and the pipe end can be divided into non-threaded steel pipe(smooth pipe)and threaded steel pipe.

Low-pressure fluid conveying straight seam steel pipe is not only used for direct fluid conveying,but also for the transformation of the original pipeline of galvanized welded steel pipe for low-pressure fluid conveying.Galvanized welded straight seam steel pipe(GB/T 3091-1993)is made by hot-dip galvanizing process on the basis of ordinary straight seam steel pipe,commonly known as white pipe.It has good corrosion resistance and is used for conveying low-pressure fluids such as water,gas,air,oil,steam,warm water in heating process,etc.

2.Structural straight seam steel pipe

Straight seam steel pipes are widely used in structural support due to their good mechanical properties and torsional rigidity.For example,spiral welded pipes for piles(SY5040-83)are made of hot-rolled steel coils as tube blanks and are formed by hot spiral development using double-sided submerged arc welding or high-frequency welding.They are suitable for foundation piles such as civil engineering structures,docks,and bridges.

In bridge construction,straight seam steel pipes are often used in bridge support structures,such as piers,bridge main beams,etc.They have strong bearing capacity and good torsional rigidity,and can effectively support the weight and load of bridges.In dock construction,straight seam steel pipes are used for the pile foundation and support structure of docks,which improves the stability and safety of docks.

3.Gas transmission straight seam steel pipe

Straight seam steel pipes are also used for gas transportation,such as coal gas,steam,liquefied petroleum gas,etc.These gases usually have a certain pressure and temperature,requiring the steel pipe to have good pressure bearing capacity and sealing.

In the gas transmission system,straight seam steel pipes are used to transport city gas to ensure the safety and stability of gas supply.In the steam transmission system,straight seam steel pipes are used to transport steam in factories and power plants to ensure the efficiency and reliability of steam transmission.In the liquefied petroleum gas transmission system,straight seam steel pipes are used to transport liquefied petroleum gas to ensure the safe transportation and use of liquefied petroleum gas.

4.Other purposes of straight seam steel pipe

In addition to the above uses,straight seam steel pipes are also used in many other fields.For example,ordinary carbon steel casing(GB3640-88)is a straight pipe joint used in industrial and civil construction,installation and other electrical machinery and equipment installation projects to protect wires.Straight seam electric welded steel pipe(YB 242-63)is a straight welded steel pipe parallel to the steel pipe through the longitudinal direction,usually divided into electric welded straight seam steel pipe,electric welded thin-walled straight seam pipe,transformer cooling oil straight seam pipe,etc.

In electrical machinery and equipment installation projects,ordinary carbon steel casing is used to protect wires and prevent them from mechanical damage or corrosion.In transformer manufacturing,straight seam electric welded steel pipes are used to manufacture transformer cooling oil pipes to ensure the normal operation and heat dissipation of the transformer.

Production process of straight seam steel pipe

The production processes of straight seam steel pipes mainly include high frequency welding and submerged arc welding.The following will introduce these two production processes in detail.

1.High frequency welded straight seam steel pipe

High-frequency welded straight seam steel pipe is made by rolling a long steel strip of a certain specification into a round tube and straight-seaming it through a high-frequency welding unit.High-frequency welding uses the skin effect and proximity effect of AC to roll the steel strip into a round tube with a cross section,and rotate it in the tube near the center of the induction coil.

During the high-frequency welding process,the edge of the tube blank opening produces a strong and concentrated thermal effect,so that the edge of the weld is quickly heated to the temperature required for welding and squeezed by the pressure roller,the molten metal achieves intercrystalline bonding,and forms a strong butt weld after cooling.High-frequency welded straight seam steel pipes have the advantages of high production efficiency,low cost,and good weld quality,and are widely used in low-pressure fluid transportation,structural support and other fields.

2.Submerged arc welding straight seam steel pipe

Submerged arc welded straight seam steel pipe is a steel pipe made of hot rolled steel strip as pipe blank,connected by double-sided submerged arc welding or single-sided submerged arc welding.Submerged arc welding is an efficient and high-quality welding method with the advantages of good weld quality,fast welding speed and low cost.

During the submerged arc welding process,welding wire and flux are fed into the weld area,and the welding wire melts under the action of the arc and combines with the steel pipe base material to form a strong weld.Submerged arc welded straight seam steel pipes are often used in high-pressure fluid transportation,oil and gas transportation and other fields,requiring the weld to have high strength and sealing.

Conclusion

As a widely used type of steel pipe,straight seam steel pipe has a variety of materials and uses.Straight seam steel pipes of different materials have different characteristics and application ranges,which can meet different working environments and needs.At the same time,the production process of straight seam steel pipe is also diverse,including high-frequency welding and submerged arc welding,which provides more options for the production and application of straight seam steel pipe.

Through the introduction of this article,I believe that readers have a deeper understanding of the materials and uses of straight seam steel pipes.When choosing straight seam steel pipes,you should choose straight seam steel pipes of appropriate materials and specifications according to the specific working environment and needs to ensure the safety and stable operation of the system.At the same time,in the production and application of straight seam steel pipes,we should pay attention to quality control and process optimization to improve the quality and performance of straight seam steel pipes and make greater contributions to the development of various fields.