Description
Vertically Integrated Fabrication — Own steel mill producing Q235B and Q345B raw material feeds directly into the fabrication workshop, eliminating third-party sourcing gaps.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235B/Q345B Fabricated Steel Structure |
| Product Type | Fabricated Steel Structure |
| Steel Grade | Q235, Q235B, Q345, Q345B |
| Section Shape | H-shape Steel Beam (Main Frame), C/Z Shape Steel Channel (Purlin) |
| Technique | Welding (MIG/MAG/SAW), CNC Cutting, Drilling, Bending, Shot Blasting |
| Surface Treatment | Painting / Galvanized |
| Standard | CE, ISO9001:2008 |
| Application | Steel Workshop, Steel Warehouse, Garages, Building Materials |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Industrial Construction | Steel workshop frames, manufacturing plant structures, equipment support platforms |
| Logistics & Warehousing | Clear-span warehouse portals, mezzanine floors, loading bay canopies |
| Commercial Building | Vehicle garages, agricultural storage buildings, retail shed frames |
| Infrastructure & EPC | Bridge approach structures, conveyor support frames, pipe rack systems |
When Material Traceability Breaks Down on a Custom Steel Structure Fabrication Service OEM Supplier Order
A missing heat number on a beam delivered to site can halt an entire inspection.
Overseas buyers outsourcing fabrication to China often discover that the fabricator sourced steel from multiple traders — each batch carrying different mill certificates, inconsistent chemistry, and no unified traceability chain. When the inspector asks for the original MTC tied to a specific beam, the paperwork trail ends at a warehouse receipt. This is not a rare edge case. Projects across the Middle East and Southeast Asia have faced rejection at the structural verification stage because fabricated components could not be traced back to certified raw material. [NEED_CITE: material traceability requirements in EN 1090 structural fabrication standard]
How Q235B and Q345B Grades Serve Industrial Frame Applications
The selection between Q235B and Q345B directly affects load-bearing design for workshops and warehouses. Q235B serves general-purpose portal frames where dead loads and moderate live loads dominate. Q345B provides higher yield capacity for heavy-duty industrial buildings with crane systems or multi-storey mezzanine configurations. Our Custom Steel Structure Fabrication Service OEM Supplier capability covers both grades from a single procurement point, with engineering support to optimize section sizes based on your structural calculations.
Structural Compliance and Surface Protection for Export Projects
Fabricated steel structures shipped internationally must satisfy both the engineering code of the destination country and the environmental conditions at the installation site. For European projects, CE certification under EN 1090 confirms that fabrication procedures — including welding, dimensional tolerance, and surface preparation — meet harmonized standards. [NEED_CITE: EN 1090 execution class requirements for structural steel fabrication] Surface treatment selection between painting and hot-dip galvanizing depends on the corrosion category defined by ISO 12944. Coastal installations and chemical processing facilities typically require galvanizing, while indoor warehouse environments may accept shop primer plus topcoat systems. Our fabrication process includes shot blasting to Sa 2.5 before any coating application, ensuring adhesion integrity regardless of the system specified.
Welding Process Selection and Its Structural Implications
The Custom Steel Structure Fabrication Service OEM Supplier workflow employs three primary welding methods — MIG/MAG for general fabrication, Submerged Arc Welding (SAW) for full-penetration flange-to-web joints on H-beams, and manual processes for complex node connections. SAW produces deep, consistent penetration on thick plate joints typical in Q345B heavy columns, while MIG/MAG offers flexibility for purlin cleats and bracing connections. CNC cutting ensures hole patterns and end preparations match approved shop drawings within tolerance, reducing fit-up gaps during site erection. Each welding procedure is qualified under WPS/PQR documentation, and welders hold current certification per AWS or EN standards. [NEED_CITE: welding procedure qualification requirements for structural steel per AWS D1.1]
The Hidden Cost of Unverified Fabrication Sourcing
When a fabricator cannot demonstrate that Q345B material originated from a certified mill, the consequences extend beyond paperwork. Structural engineers in the destination country may refuse to sign off on the erection permit. Customs authorities in markets with strict import controls can hold shipments pending material verification. On-site rework — cutting out untraceable welds, replacing beams, or commissioning third-party testing after delivery — typically costs multiples of the original fabrication price. [NEED_CITE: structural steel import documentation requirements for CE-marked components]
Why Project Teams Source Custom Steel Structure Fabrication Service OEM Supplier Through Us
Our fabrication division operates under the same corporate entity as the steel production facility. Raw Q235B and Q345B plates and sections move from our rolling mill directly to the fabrication floor — no intermediary stockist, no certificate chain break. The workshop handles the full sequence from CNC nesting and cutting through welding, assembly, shot blasting, and coating. Engineering staff review client drawings for constructability before production begins, flagging potential issues with weld access, bolt hole clearance, or shipping dimensional constraints. We maintain 2,800+ raw material specifications in inventory, allowing immediate production start once drawings are approved. Professional loading plans account for oversized component geometry, preventing the transit damage that turns perfectly fabricated pieces into site rejects.
Documentation & Compliance
- Mill Test Certificate documenting Q235B/Q345B chemical composition and mechanical properties per Chinese GB standards, with heat number traceability to each fabricated component
- CE certificate confirming EN 1090 compliance for structural steel fabrication exported to European Union markets
- ISO 9001:2008 quality management system certificate covering the integrated fabrication process from material receipt to final inspection
- Welding procedure specifications (WPS) and procedure qualification records (PQR) for all joint types used in the project
- Dimensional inspection reports and coating thickness measurements for each shipment batch
- Complete export documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Fabricated H-beams and columns bundled with steel strip bands and timber spacers to maintain separation and prevent coating damage during ocean transit
- Galvanized components wrapped with protective film at edges and contact points to preserve zinc coating integrity throughout the shipping cycle
- Shot-blasted and painted assemblies loaded with designated blocking points to avoid surface contact and coating abrasion
- C and Z purlins nested and strapped in bundles sized for container loading optimization, maximizing volume utilization for 40ft open-top or flat-rack shipments
- Each piece marked with heat number, steel grade, and piece identifier for site identification and traceability verification
- Professional loading plans prepared for oversized cargo, including lashing calculations and weight distribution for both container and break-bulk shipments
Initiating Your Custom Steel Structure Fabrication Service OEM Supplier Inquiry
Submit project drawings in PDF or DWG format along with steel grade requirements, surface treatment preference, and target standards. Our engineering team responds within 24 hours with a preliminary assessment covering fabrication feasibility, shop drawing timeline, and production scheduling. Once specifications are confirmed, we provide a detailed quotation including material, fabrication, coating, packing, and shipping costs with complete documentation packages.
Request Your Fabrication Assessment
Share your structural drawings and project specifications to receive a detailed quotation with material traceability documentation and production timeline. Contact us at admin@xjystructure.com or via WhatsApp at +86 188 5315 7756.
