Types Of Seamless Steel Pipes

Diameter:＜φ76mm, accounting for 35% of seamless carbon steel pipe, ＜φ159-650mm, accounting for 25% of seamless carbon steel pipe

Characteristic: Economical, widely used, structurally stable, and resilient

Use:1.9 million tons of general-purpose pipes, accounting for 54%; 760000 tons of oil pipes, accounting for 5.7%; Hydraulic pillars and precision pipes account for 150000 tons, accounting for 4.3%; Stainless steel pipes, bearing pipes, and automotive pipes totaling 50000 tons, accounting for 1.4%.

The following are commonly used stainless steel seamless pipe specifications and their size range:

1, ASTM A312/A312M stainless steel seamless pipe standard specifications

Outside diameter range: 1/8" - 30" (10.3mm - 762mm)

Wall thickness range: SCH 5S - SCH 160 (0.5mm - 49.5mm)

2、GB/T 14975 Austenitic stainless steel pipe standard specifications

Outer diameter range: 6mm - 219mm

Wall thickness range: 0.5mm - 20mm

3、DIN17456 Austenitic stainless steel pipe standard specifications

Outer diameter range: 1/8" - 30" (DN6 - DN750)

Wall thickness range: SCH 5S - SCH 160 (0.5mm - 49.5mm)

4、JIS G3448 Austenitic stainless steel pipe standard specifications

Outside diameter range: 15.88mm - 318.5mm

Wall thickness range: 0.8mm - 5mm

Characteristic: High precision, high smoothness, moisture resistance, acid resistance, alkali resistance, salt spray resistance, can meet the food hygiene level of pipelines. High cost, not suitable for large-scale application scenarios.

Use:Stainless steel seamless pipe is a widely used pipe material with strong corrosion resistance and long service life. Commonly used in industries such as chemical, petroleum, medical, and food.

Diameter:The outer diameter of alloy seamless steel pipes generally ranges from 6mm to 720mm, the wall thickness of alloy seamless steel pipes generally ranges from 1mm to 120mm, and the commonly used lengths of alloy seamless steel pipes are 6 meters, 12 meters, etc. In practical applications, cutting or irregular production may also be carried out as needed.

Characteristic: The advantages of alloy seamless steel pipe are mainly reflected in the following aspects:

1. corrosion resistance: alloy seamless steel pipe is made of a mixture of many metal elements, which has good corrosion resistance.

2. high temperature resistance: alloy seamless steel pipe can be used for a long time in a high temperature environment, not easy to deformation, not easy to crack.

3. High strength: the strength of alloy seamless steel pipe is higher than ordinary steel pipe, which can withstand greater pressure and tension.

4. High precision: alloy seamless steel pipe is made with high precision, no joints, good surface finish, not easy to appear oxidized skin.

However, alloy seamless steel pipe also has some disadvantages, mainly in the aspects of complex production process and higher cost. At the same time, due to the special material of alloy seamless steel pipe, it is difficult to process, so it is necessary to use specialized production equipment and tools.

Use: Alloy seamless steel pipe has good corrosion resistance and high temperature resistance, so it is widely used in petroleum, chemical, metallurgy, aerospace, automobile and other fields. Among them, the petroleum and chemical industry is the most widely used, mainly used in oil wells, pipelines, chemical equipment and so on.

Material:These pipes are made from duplex steel, which is a combination of austenitic and ferritic stainless steels.

Characteristic:They offer high strength and excellent corrosion resistance.

Use:Making them ideal for use in harsh environments

Surface treatment: seamless black steel pipe generally refers to seamless steel pipe without any surface treatment.

Material: seamless black steel pipe is made of ordinary carbon steel, low alloy structural steel or alloy steel material.

Characteristics: high strength, good toughness, good workability, good sealing performance

Application: Widely used in petroleum, chemical, aviation, nuclear power, construction, machinery, automobile manufacturing and other fields.

Surface treatment: The hot-dip galvanized seamless pipe has a relatively high amount of zinc plating, with an average zinc coating thickness of over 65 microns, greatly enhancing its corrosion resistance.

Material: seamless black steel pipe

Characteristics: Good corrosion resistance, unchanged mechanical properties of the material, silver-white surface

Application: Fasteners, standard parts, water pipes, mechanical parts, pipelines, building structures, etc.

Surface treatment: After anti-corrosion and insulation treatment

Material: seamless black steel pipe

Characteristics: Good thermal insulation, good corrosion resistance, other mechanical properties remain unchanged.

Application: 

1. Oil and natural gas sector

In the field of oil and natural gas transportation, anti-corrosion and insulated steel pipes are the preferred products. Anti corrosion treatment can effectively prevent corrosion of steel pipes caused by corrosive environments such as ocean salt spray, while the use of insulation materials can reduce temperature loss, making oil and natural gas transportation more stable and efficient.

2. Chemical industry

In the field of chemical pipelines, anti-corrosion and insulation steel pipes are indispensable pipeline products. Many chemical media are corrosive to steel pipes, and using anti-corrosion and insulated steel pipes can effectively prevent pipeline damage, improve operational safety and reliability.

3. In the field of urban water supply and heating

The field of urban water supply and heating is also one of the widely used fields of anti-corrosion and insulation steel pipes. Steel pipes need to maintain a certain temperature during the transportation of water and heat, and the use of insulation materials can effectively prevent temperature loss; Meanwhile, anti-corrosion treatment can also improve the service life and operational safety of pipelines.

Application：Oil pipe, natural gas pipe, oil well drill pipe, oil casing, downhole gas pipeline, steam pipe, compressed air pipe, water supply pipe, chemical equipment, reactor, shipbuilding pipe, aviation cabin pipe, building structural pipe, mechanical pipe, automotive pipe, parts and so on.

Characteristic：High strength, high temperature resistance, high pressure resistance, corrosion resistance, multiple types of steel, thick wall thickness, large diameter,The surface is somewhat rough.

1. Fluid transportation: Cold rolled seamless steel pipes are important pipeline materials for transporting fluids, such as water, oil, natural gas, etc. Due to its seamless structure, the fluid flows more smoothly in the pipeline, reducing fluid resistance and energy loss.

2. Structural support: Cold rolled seamless steel pipes are often used as support materials for various structures, such as bridges, buildings, towers, etc., due to their high strength and good plasticity. Its excellent mechanical properties and stability make the structure more stable and reliable.

3. Mechanical manufacturing: In the field of mechanical manufacturing, cold-rolled seamless steel pipes also play an important role. It can serve as a raw material for mechanical parts, such as shafts, sleeves, bearings, etc., providing a solid material foundation for mechanical manufacturing.

Characteristic：Smaller size, better quality, higher accuracy, thinner wall thickness，smooth and even surface.

Application：Cold-drawn steel pipe has a wide range of uses. Due to its excellent properties such as high strength, high precision, corrosion resistance and high temperature resistance, it can be used in various fields. For example, in the petroleum industry, cold-drawn steel pipe is used to manufacture petrochemical equipment, valves, pumps, etc.; in the electric power industry, cold-drawn steel pipe is used to manufacture pipelines, boilers, heat exchangers, etc.; in the field of construction, cold-drawn steel pipe is used for piling, bridges, high-rise buildings, etc.; in the mechanical manufacturing, cold-drawn steel pipe is used to manufacture mechanical parts, automobile parts, etc..

Characteristic：Reduced dimensional errors in internal and external diameters, high surface quality, high mechanical properties, and a wide range of shapes.

Application：Squeezed seamless steel pipes have excellent mechanical properties and corrosion resistance, and are widely used in the following fields:

1. Automotive industry: used to manufacture key components such as automotive engines, chassis, and brake systems, to improve the safety and reliability of automobiles.

2. Petrochemical industry: used for manufacturing petroleum pipelines, chemical equipment, etc., capable of withstanding high temperature, high pressure, and corrosive media.

3. Electricity: Used for manufacturing pipeline systems for power plant boilers and cooling water pipes for nuclear power plants, ensuring long-term stable operation.

4. Aerospace: used to manufacture key components such as aircraft fuselage and wings, ensuring the safety and stability of the aircraft.

5. Other fields such as shipbuilding, medical equipment, sports equipment, etc. are also widely used.

1. High strength and toughness: Extruded seamless steel pipes have high tensile strength and yield point, as well as good toughness, which can effectively resist various stresses while withstanding large pressures.

2. Good corrosion resistance: The extruded seamless steel pipe has undergone special anti-corrosion treatment, which has good corrosion resistance and can work stably for a long time in various complex environments.

3. Good processing performance: The wall of the extruded seamless steel pipe is uniform, the inner and outer surfaces are smooth, and it has good cutting and welding performance, making it easy to process and connect.

4. Excellent mechanical properties: The mechanical properties of extruded seamless steel pipes are excellent, with higher indicators such as tensile strength, yield point, and elongation than ordinary seamless steel pipes.

5. The diameter of extruded seamless steel pipes can be made smaller.

Application: Used for manufacturing structural components and mechanical parts, building structures, mechanical manufacturing, etc.

Features: Good bending resistance, easy welding and processing, high strength.

Application: Steel wood furniture, agricultural machinery framework, greenhouse framework, mechanical components, shipbuilding, etc

Features: When subjected to internal or external radial pressure, the circular section of the seamless pipe is subjected to uniform force, so it has good characteristics of compression resistance and high temperature resistance.

Application: A large number of seamless round tube are used for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water, and certain solid materials. A small amount is used as support for building structures and mechanical structures, pile driving pipes, glass curtain wall engineering, etc.

Features: The special shape can meet various structural design requirements, with smooth inner and outer surfaces without joints, increasing the compressive strength of pipelines or structures.

Application: Seamless shaped steel pipes have a wide range of applications in the field of construction. It can be used to make supporting structures, bridge components, stair handrails, etc.

In the field of engineering, seamless shaped steel pipes are commonly used to make conveying pipelines, pipeline connectors, and so on. It can also be used to make mechanical equipment, automotive components, etc.

Features: The biggest characteristic of thick walled seamless steel pipes is their large wall thickness, which gives them high pressure bearing capacity and strength. Meanwhile, due to the unique production process of seamless steel pipes, both the inner and outer walls are very smooth, making it difficult to accumulate impurities and dirt, thus ensuring smooth fluid flow. In addition, thick walled seamless steel pipes also have good corrosion resistance and can be used for a long time in harsh environments.

Application: Thick walled seamless steel pipe is an important industrial material widely used in fields such as petroleum, natural gas, chemical, and power.

Features: High precision, light weight, high strength, corrosion resistance, good thermal conductivity

Application: Mainly used in the fields of structural components, decoration, precision manufacturing, and instrumentation.