Tubos de acero estructural

Proceso de manufactura

The manufacturing processes of Structural Steel Pipe mainly include the following:

• Hot Rolling/Cold Drawing: Used for seamless steel pipe production, suitable for high-pressure, high-temperature environments (such as oil and gas transmission). The material includes carbon steel, alloy steel, etc.
• Electric Resistance Welding (REG): Through the high-frequency electric current, weld molding, a lower cost, widely used in architectural structures and general pipeline systems;
• Submerged Arc Welding (SAW): Divided into Spiral Welding (SAW) and Straight Seam Welding (LSAW), suitable for large diameter and thick-walled pipelines, commonly used for long-distance oil and gas transmission.
• Galvanizing: Enhanced anti-corrosion performance through the hot dip galvanizing process, extending the service life to more than 50 years.

Features Of Structural Steel Pipe

1. High Strength and Load-Bearing Capacity

Structural steel tubes are generally made of carbon structural steel, low alloy steel, or high-strength alloy steel. These materials have strong tensile and compressive properties. They are ideal for structures that face heavy loads, such as bridges, skyscrapers, and industrial frames.

Steel-Pipe Concrete Structures are popular in large-span trusses and space designs. This is due to the combined strength of steel pipes and concrete. Together, they greatly enhance resistance to bending and twisting.

2. Diversified Materials and Specifications

The materials are divided into three types:

• Carbon structural steel pipes (like Q235 and Q345)
• Low alloy high-strength steel pipes (such as St52)
• tubos de acero inoxidable

These types meet the needs for corrosion resistance and high-temperature resistance in various environments.

Specifications use standard designs, such as ASTM B36.10/19 or ASME standards. They specify nominal size (NPS) and wall thickness (Schedule). This makes them suitable for welding, flange, threaded connections, and other installation methods.

3. Production Process and Applicability

Seamless Pipe: Manufactured by hot rolling or cold drawing process, suitable for high-pressure, high-temperature scenarios (e.g., oil pipelines, boiler structures).

Welded Steel Pipe (Welded Pipe): It adopts high-frequency welding or submerged arc welding technology, with lower cost, and is mostly used for construction scaffolding and light steel structures.

4. Structural Stability and Construction Convenience

Steel pipe structures, such as pipe trusses and columns, are lightweight and very stiff. They offer good seismic performance and feature flexible node designs, including coherent and cast steel nodes. This design helps with easier modular assembly.

For example, the steel tube column base structure has enhanced bending resistance through the design of stiffening ribs and anchorage holes, effectively preventing the risk of fracture.

5. Industry Norms and Application Scenarios

Comply with the mandatory standards of construction, energy, transportation, and other industries, such as ASME B31 series (pipeline design), GB/T 3091 (steel pipe for low-pressure fluid transportation), etc., and are widely used in:

• Engineering structures: scaffolding, tower masts, bridge supports;
• Energy facilities: oil and gas pipelines, heat exchanger manifolds;
• Special engineering: blast-resistant energy absorption devices, deep-sea platform pipe racks.

6. Durability and Maintenance Costs

Hot dip galvanizing or coating treatment can significantly improve corrosion resistance and extend service life (e.g., outdoor billboards, underground pipe corridors).

Welded nodes can be partially relieved of residual stresses by hot-dip galvanizing, reducing the risk of deformation at a later stage.

Technical specifications

Estándares

Structural tubing is available in a variety of standards depending on the region in which it is used. In the Americas, ASTM A53 or ASTM A500 can be followed, and in Europe, EN 10219 can be followed. In the U.S., GB/T3091, GB/T13793 and GB/T 6728 can be followed.

• ASTM A53: ASTM A53 is one of the most widely used standards for carbon steel pipe materials in the oil and gas and structural sectors.
• ASTM A500: We specialize in manufacturing and exporting ASTM A500 standard rectangular tube hollow sections.
• EN10210 Hollow profiles: EN 10219 profiles are available in round, square and rectangular shapes to meet a wide range of design and construction requirements.

Structural Steel Pipe Dimensions

Advantages of UNIASEN Structural Steel Tubes

• Strict selection of raw materials: only high-quality raw materials are used, and “inferior materials” are eliminated from the source;
• Strict control of the process: the production chain adopts the closed-loop process of “hot rolling → heat treatment → cold drawing → non-destructive testing”, and the temperature is controlled at 1050±10℃ when hot rolling to ensure uniform wall thickness (error ≤0.5mm); when cold drawing, “multi-stage drawing” process is adopted to make the surface roughness reach below Ra0.8 to reduce fluid resistance; Strict control of the process: the production chain adopts the closed-loop process of “hot rolling → heat treatment → cold drawing → nondestructive testing”. When hot rolling, the temperature is controlled at 1050±10℃ to ensure that the wall thickness of the pipe is uniform (error ≤0.5mm); when cold drawing, the process of “multi-drawing” is adopted, so that the surface roughness reaches below Ra0.8, which reduces the resistance to fluids;
• Finished Product Inspection: Each structural pipe is subjected to ultrasonic flaw detection, hydraulic test, mechanical property test, and is accompanied by a “quality traceability report”, allowing customers to “test” the pipe. “We believe that ”service is not an add-on”.

We believe that “service is not an additional item, but an extension of the product”, and have established a full-process service system.

Pre-sale: Get a free selection and consultation. Our engineers will assess your project conditions, like pressure, temperature, media, and installation environment. Then, we’ll recommend the best combination of materials, processes, and specifications. This helps you avoid costly mistakes or wrong choices.

In the sale: real-time progress tracking to ensure on-time delivery.

After-sales: 24-hour response to customer “installation problems” (such as welding guidance), “quality problems” (such as non-destructive testing re-inspection), within 24 hours to give a solution, so that customers “construction without worries! We will provide solutions within 24 hours, so that customers can “construct without worries”.

Aplicaciones

1. Construction & Infrastructure: Structural Frames & Large Span Structures

Structural steel tubes are the core load-bearing members of large structures such as buildings, bridges, ships, and other similar structures. They are mainly used to form structural frames and provide overall stability.

• Building Frames: Heavier structural steel tubes, like thick-walled tubes, I-beams, angles, and channels, meet building industry standards. They are used to create the structural frame of a building, such as columns and beams, which support the roof, walls, and internal loads.
• Large-span bridge: This type is for building large-span, heavy-duty steel pipe bridges, like those over canals. It uses floating drag installation technology to tackle construction challenges for big structures.
• Space Pipe Joist: This high-strength pipe joist connects the web and chord directly, so there’s no need for a node plate. It’s ideal for large-span structures like gymnasiums and exhibition centers. It saves steel and offers great mechanical properties.

2. Industry and Energy: Pipe Racks and Specialty Structures

In industry, structural steel tubes mainly support equipment, pipelines, and special facilities. They are especially useful when load resistance and easy maintenance are needed.

• Pipe Racks: A key structure in petrochemical, chemical and power plants, used to support pipelines, power cables, instrumentation cable trays, and even mechanical equipment, vessels and valve access platforms. Its structure has transverse bending-resistant frames (Bents) to support gravity loads. It also includes longitudinal columns and diagonal braces to resist lateral loads. This design ensures the stability of the piping system.
• Greenhouse Structure: The daylight greenhouse uses a column-free, large-span truss made of steel pipe. This design keeps sunlight from being blocked by columns and also ensures strong support.

3. Electric power engineering: Transmission steel pipe tower/pole

Structural steel pipe is the main support for power transmission lines. It forms a Steel Pipe Tower or a Transmission Steel Pipe Pole. These structures hold the weight of the conductor and withstand wind, ice, and snow loads.

Steel Pipe Tower for Power Transmission: Uses direct connections with pipe fittings, solving “load and stiffness change along the pole.” A numerical model is created with a step folding algorithm to maintain overall stability.

Transmission steel pipe poles: used for rural or suburban transmission lines, with a simple structure but high strength, adapted to complex terrain.

4. Others: Temporary Structures and Special Applications

Steel Pipe Scaffolding: As a temporary structure in construction, it ensures the stability of the scaffolding through the strength of clamp fastening, and is used to support construction personnel and materials.

Types of Structural Steel Pipe

1. Classification by Material

The material of structural steel pipe determines its strength, corrosion resistance and applicable environment, and common types include:

3. Classification by Application Scenarios

The design of structural steel tubes needs to match the specific engineering requirements, and the corresponding types of common application scenarios.