China Steel Structure Manufacturers, Suppliers and Factory - Wholesale Steel Structure

Your Professional Steel Structure Supplier

Sunlion Piping Engineering Co., Ltd. is a global supplier of piping systems and structural steel modules for energy, petrochemical, offshore, nuclear, and heavy industrial projects. With over 20 years of international project experience, Sunlion delivers vertically integrated solutions from raw materials to finished modules. The company serves leading EPC contractors and end users worldwide, providing compliant products, modular fabrication, inspection coordination, and OEM/ODM customization to support efficient and reliable project execution.

Galvanized Steel Grating
Galvanized steel grating is manufactured by resistance welding load-bearing bars and cross bars arranged at specific intervals, followed by hot-dip galvanizing for corrosion protection. Characterized
Pipe Spool Fabrication
Piping Spool Fabrication are essential components in modern industrial projects, enabling efficient and high-quality pipeline installation across oil & gas, petrochemicals, LNG, power generation,
Other Steelstructre
Steel structures are the backbone of modern industrial and infrastructure projects, widely used in marine wharf piling, pipe sheet pile walls, building construction, wind power, FPSO (Floating

why choose us

Quality Control

All products are manufactured to recognized standards such as ASME, DIN, GB, and JIS and undergo coordinated inspection and testing by third-party organizations such as SGS to ensure traceability and consistent quality.

Customization Services

We offer OEM and ODM services, tailored to project requirements, including material grades, dimensional tolerances, marking systems, packaging methods, and documentation, to meet both standardized and project-specific engineering needs.

Integrated Supply Chain

We manage the entire supply chain, from steel pipe sourcing to prefabricated piping and structural modules. This integrated model simplifies procurement coordination, improves schedule control efficiency, and minimizes interface risks between multiple suppliers in complex projects.

Sales Markets

With over two decades of experience executing international projects, we have delivered materials and modules to projects in the Middle East, Australia, the Americas, Africa, and Europe, supporting EPC general contractors under various technical standards and logistical conditions.

Specification

Specification Item	Details
Product Name	Steel Structure
Product Type	Pipe Spool Fabrication
Scope	Prefabricated piping assemblies for site installation
Materials	Carbon steel, stainless steel, alloy steel
Standards	Fabricated to ASME, EN, or GB requirements
Pipe Size Range	DN15 – DN1800
Wall Thickness	Standard pipe schedules
Connection Method	Welding with fittings and flanges
Fabrication Process	Cutting, fit-up, welding, inspection
Application	Process plants, energy, petrochemical projects

Advantages of Steel Structure

01/

Steel is tensile. It has a high strength-to-weight ratio, so it has high strength per unit mass. So no matter how large the overall structure is, the steel sections will be small and lightweight, unlike other building materials.

02/

Steel can be easily fabricated and produced massively. Steel sections can be produced off-site at shop floors and then assembled onsite. This saves time and increases the efficiency of the overall construction process.

03/

Structural steel is very flexible. You can mold it into any shape without changing its properties. You can convert it into sheets or turn it into wires as per the design.

04/

It is very durable. Steel structures can withstand external pressures such as earthquakes, thunderstorms, and cyclones. A well-built steel structure can last up to 30 years if maintained well.

Types of Steel Structure

Frame Structures
Frame structures are made using a network of steel beams and columns. This type is frequently used in constructing multi-story buildings, such as offices and residential complexes. Frame structures allow for open floor plans and high design flexibility, supporting both strength and aesthetics.

Truss Structures
Trusses are triangular units used to distribute loads and minimize weight while maximizing stability. Steel trusses are common in bridges, roofs, and warehouses, where wide spans and load-bearing are key requirements. The triangle design also resists bending, making it ideal for large, open spaces.

Shell Structures
Shell structures, or steel plate structures, use thin, curved plates to create large, open spaces without the need for internal columns. These structures are commonly used in auditoriums, sports stadiums, and hangars due to their ability to cover large areas efficiently.

Portal Frame Structures
Portal frames use two vertical columns and a horizontal beam to create a rectangular frame. They are widely used in warehouses, factories, and large industrial buildings, as they allow for wide spaces with minimal support columns.

Pre-Engineered Steel Buildings (PEBs)
Pre-engineered buildings are prefabricated in factories and transported to the construction site. PEBs are a popular choice for commercial and industrial applications due to their rapid assembly, cost efficiency, and high customization.

Steel Structure Material

Alloy Steel
Alloy steel is made up of various metals and is considered to be one of the most affordable. It does resist corrosion, but its strength is based on the different other metals that are in it. Most of the time, those elements are nickel, copper, and aluminum.

Stainless Steel
Almost everyone knows about stainless steel, as this is the most used and most common type of steel. Stainless steel usually contains up to 20% chromium, which is the alloy material within it. Stainless steel is almost always resistant to corrosion.

Carbon Steel
Carbon steel may lack shine, but it has three different variations you may want to consider. The three variations include a low, medium, and high carbon steel composition substrate. In fact, carbon steel is so popular it makes up about 90 percent of all steel production.

Tool Steel
Tool steel is strong, hard, and often used for hammers or any other metal tool type. Most of the time, tool steel has components of tungsten, cobalt, and other such composition material. What's more, the tool steel is very heat resistant and has versatility and durability that's hard to beat.

High-Strength Low-Alloy Steels
High-strength low-alloy (HSLA) steel is often chosen over carbon steel as it has excellent mechanical properties and high corrosion resistance. One thing that makes HSLA steel different from other types of structural steel is its design purpose.

Forged Steels
Forged steel is a type that has been pressed or hammered into a desired shape. This process is known as forging, and it results in steel that's usually stronger and more durable than other types.

Quenched and Tempered Alloy Steels
These steels are ones that have gone through a specific heat treatment process. It results in strong, hard, and tough steel.

Applications of Steel Structure

Buildings: Steel structure is the backbone of many modern buildings, from skyscrapers to homes. It is used to create the frames that support the weight of the walls, floors, and roof.

Bridges: Steel structure is also used to build bridges, which can be very long and span large distances. It is strong enough to support the weight of vehicles and pedestrians, and it can also withstand the forces of wind and water.

Towers: Steel structure is used to build towers, such as telecommunications towers and wind turbines. These towers must be able to withstand strong winds and other extreme weather conditions.

Other structures: Steel structure is also used in a variety of other structures, such as warehouse constructions, stadiums, and industrial plants.

Customization Services

We offer customized steel structure manufacturing solutions to meet your needs. Key customization options include:

Material	Customizable
Dimensions	Customizable
Tolerances	Customizable
Welding	Customizable
Surface Treatment	Customizable
Our customization capabilities extend beyond the options listed above. Should you have additional requirements, we are able to make flexible adjustments in accordance with your specific needs and circumstances.

Packaging and Shipping

Packaging	Bundling or palletizing
Transportation methods	Road transport, rail transport, sea transport

FAQ

Q: What is the steel structure manufacturing process?

A: Includes drawing detailing → material procurement → cutting → beveling → fit-up → welding → NDT → correction → sandblasting → coating → marking → packaging & shipping.

Q: Do you support BIM and 3D modeling?

A: Yes, we use Tekla, Revit, PDMS for 3D modeling, digital fabrication, and assembly simulation.

Q: Are welding procedures qualified?

A: Yes, all WPS/PQRs are qualified per AWS D1.1, ISO 15614, or EN 1090-2 and documented.

Q: What is the maximum single-piece size?

A: Max: 18m L × 4m W × 3.5m H, ≤30 tons; oversized items can be segmented for site assembly.

Q: Are your structures suitable for offshore wind projects?

A: Yes, we manufacture wind towers and transition pieces per DNV-ST-0126 and IEC 61400-6, using S355NL/S420ML, with class approval.

As one of the most professional steel structure manufacturers and suppliers in China, we offer a wide range of products with superior quality. Please rest assured to wholesale high-grade steel structure at competitive price from our factory. Contact us for more details.

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