Description
Factory-Direct OEM Steel Fabrication — Every structural component is cut, welded, and drilled in-house across 3 production lines with original mill test certificates for Q235B and Q345B steel grades.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | OEM Structural Steel Fabrication Parts |
| Product Type | Steel Fabrication Components (beams, columns, connection plates, bracing members) |
| Steel Grade | Q235B, Q345B |
| Standard | GB/T 700, GB/T 1591; EN 10219 compliance available |
| Section Shape | Custom per engineering drawings |
| Size Range | Up to 12,000 mm length, plate thickness 6–60 mm |
| Wall Thickness | 6–60 mm (plate-based fabrication) |
| Length | Custom cut-to-length per drawing |
| Technique | CNC cutting, submerged arc welding, drilling, shot blasting |
| Surface Treatment | Shot blasted to Sa 2.5; primer coating or hot-dip galvanized |
| Tolerance | Per GB/T 50205 / EN 1090 execution class |
| Ends | As fabricated per drawing |
| Application | Steel warehouses, workshops, industrial buildings |
| MOQ | 1 ton or trial order |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Industrial Construction | Warehouse frames, workshop portal structures, mezzanine platforms |
| Infrastructure | Bridge walkway supports, utility equipment shelters |
| Logistics & Storage | Racking systems, conveyor support frames, loading dock structures |
| Agriculture | Large-span farm equipment sheds, grain storage building frames |
Where Dimensional Accuracy Decides On-Site Assembly Cost
A 50 mm cutting error on a single H-beam can halt an entire warehouse erection sequence.
When structural steel parts arrive at a remote job site with misaligned bolt holes or wrong-length connection plates, the crew cannot improvise. Re-cutting and re-welding on-site requires certified welders, additional NDT, and often a full resupply from China — delaying the project by weeks. [NEED_CITE: EN 1090 execution class tolerance requirements for structural steel fabrication]
For buyers importing OEM steel fabrication from China, the real risk is not the unit price but the hidden cost of dimensional deviation: rejected weld inspections, customs holds on missing mill certificates, and the need to reorder components that were supposed to ship in one container.
Matching Fabrication Precision to Warehouse and Workshop Engineering Demands
OEM steel fabrication for warehouses and workshops requires components that fit together without field modification. Portal frames must carry crane loads, wind loads, and seismic forces as designed — meaning every beam-to-column connection plate must be drilled to exact coordinates. Q345B steel provides higher yield strength than Q235B for long-span rafter applications, while Q235B remains cost-effective for secondary members and bracing. Our 3 production lines handle simultaneous cutting, welding, and drilling, so a full warehouse kit — columns, rafters, purlins, bracing, and base plates — ships in one coordinated consignment.
Structural Code Compliance and Certification Pathways
Engineering norms such as EN 1993 (Eurocode 3) and GB 50017 require traceable material properties for load-bearing steel members. For European markets, EN 10219 governs cold-formed welded hollow sections used in workshop frames, while EN 1090 sets execution class requirements for fabrication tolerances and weld quality. [NEED_CITE: EN 10219 cold-formed welded structural hollow section technical delivery conditions] Buyers importing into the EU need CE marking backed by factory production control (FPC) certification. We supply CE-certified fabrication under EN 10210/EN 10219 with Lloyd’s Register oversight, ensuring customs clearance proceeds without document-related holds. Shot blasting to Sa 2.5 and primer application protect components during transit and provide a ready surface for final coating on site.
Steel Grade Selection and Welding Process Fundamentals
Q235B is a carbon structural steel with minimum yield strength at 235 MPa, widely used for non-critical structural members, secondary beams, and bracing in warehouse construction. Q345B, a low-alloy high-strength steel, offers higher yield strength suitable for primary portal frame members, crane-supporting beams, and long-span rafters where weight reduction and load capacity matter. Submerged arc welding (SAW) produces deep-penetration, high-quality welds on thick plates — essential for moment connections in workshop frames. CNC flame and plasma cutting ensure hole patterns and edge profiles match engineering drawings within tight tolerances. For corrosive environments such as agricultural or coastal warehouses, hot-dip galvanizing after fabrication provides long-term corrosion protection; for indoor workshops, shot blasting plus primer is sufficient and more economical. [NEED_CITE: Q345B vs Q235B steel grade comparison for structural applications]
The Hidden Cost of Unverified Fabrication Quality
Accepting OEM steel fabrication without independent verification creates compounding risks. Material substitution — receiving Q235B where Q345B was specified — reduces load capacity and may fail structural review. Weld defects without NDT records create safety liabilities that surface only during inspection or, worse, under load. Missing mill test certificates delay customs clearance at destination ports, triggering demurrage charges and project delays. [NEED_CITE: structural steel fabrication quality control requirements per EN 1090] Dimensional non-conformance forces on-site rework that costs more than the original fabrication savings.
Procurement Confidence Through In-House Control
Every OEM steel fabrication order runs through our own production facility — no outsourcing to unverified subcontractors. Our in-house metallurgical lab tests every heat of steel before cutting begins, and original mill test certificates accompany each batch. With 2,800+ stock specifications across tubes, pipes, plates, and sections, we consolidate multi-product warehouse kits into single-container shipments, reducing logistics cost and coordination overhead. Our CE (EN 10210/EN 10219) and ISO 9001:2015 certifications, plus FPC approval, satisfy European customs and engineering compliance requirements. For non-standard dimensions or custom hole patterns, our CNC lines produce to drawing with typical lead times of 15–25 days. Professional export teams optimize container loading for long structural members, minimizing freight cost per ton.
Documentation & Compliance
- Mill test certificate documenting Q235B or Q345B chemical composition and mechanical properties per GB/T 700 and GB/T 1591
- CE certificate covering EN 10210 and EN 10219 structural hollow sections and fabricated components
- ISO 9001:2015 quality management system certificate for fabrication processes
- SGS or BV third-party inspection report available upon request for weld quality and dimensional verification
- Full material traceability by heat number from steel mill to finished component
- Export customs documents including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Fabricated steel components bundled with high-tensile steel strips and timber cradles to prevent deformation during ocean freight
- Shot-blasted and primed surfaces wrapped with waterproof VCI paper to prevent flash rust during container transit
- Hot-dip galvanized parts separated with rubber spacers to protect zinc coating from abrasion
- Container loading plans optimized for long members (up to 12 m) using 40ft open-top or flat-rack containers when standard units cannot accommodate
- Heat number and steel grade markings stenciled on each component for on-site identification and traceability
- FOB, CIF, and DDP shipping terms available with real-time tracking and port coordination
Start Your Fabrication Quote With Drawings and Specifications
Submit your engineering drawings, steel grade requirements (Q235B or Q345B), quantities, and destination port to receive a detailed quotation with volume pricing, production timeline, and certification package. We respond within 12 hours with a clear breakdown of fabrication scope, surface treatment options, and container loading plan.
Request Your OEM Steel Fabrication Quote Today
Send specifications, drawings, and destination details to receive competitive pricing with mill test certificates and compliance documentation.
Contact: Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxinjiyuan.com
