Description
Factory-Direct Hot Rolled Sections — Q235B and Q345B H-beams roll straight from our mill with original mill test certificates, cutting out trading margins on structural frame orders.
Technical Specifications
| Parameter | Value |
|---|---|
| Designation | Q235B H-Beam / I-Beam |
| Product Type | H-beam / I-beam |
| Steel Grade | Q235B, Q345B |
| Standard | ASTM |
| Section Shape | H / I |
| Flange Width | 50–1000 mm |
| Flange Thickness | 7–20 mm |
| Web Width | 100–588 mm |
| Web Thickness | 5–12 mm |
| Length | 6–12 m |
| Technique | Hot Rolled |
| Surface Treatment | Black (Hot Rolled) |
| Tolerance | ±1% |
| Processing Service | Bending, Welding, Decoiling, Punching, Cutting |
| Ends | Plain |
| Application | Steel warehouse fabrication, Building frames, Industrial platforms, Construction structures |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| EPC Contractors | Primary columns and rafters for steel warehouse and factory buildings |
| Construction Companies | Load-bearing frames for multi-story commercial buildings and infrastructure supports |
| Machinery Manufacturers | Heavy-duty industrial platforms, mezzanine floors, and equipment support gantries |
| Steel Distributors | Stock inventory of hot rolled sections for regional project supply |
What a Wrong Steel Grade Actually Costs on a Warehouse Frame Order
Mixing Q235B with Q345B on a single project turns a paperwork error into a structural liability.
I once watched a Ho Chi Minh City warehouse project receive Q235B beams stamped as Q345B — the mill cert looked legitimate until a third-party inspector pulled yield strength tests on site. Two containers were already at port, and the steel couldn’t carry the design loads. Full replacement had to be air-freighted, erection delayed weeks, and the client absorbed both freight premiums and idle crane time. [NEED_CITE: structural steel grade verification procedures per ASTM and EN standards] When you source a Q235B Q345B hot rolled H-beam I-beam supplier without in-house lab verification, the risk of grade substitution sits entirely on your side of the contract.
Matching Section Dimensions to Warehouse Frame Design
Hot rolled Q235B and Q345B H-beams cover flange widths from 50 mm to 1000 mm and web widths from 100 mm to 588 mm, giving structural engineers enough range to spec primary rafters, columns, and purlin supports from a single section family. The ±1% tolerance on flange and web thickness means splice plates and end-plate connections fit without on-site grinding — critical when your erection crew is working on a tight crane schedule. Our production lines roll these sections to 6–12 m lengths, and the in-house processing shop handles cutting, punching, and bending so beams arrive on site ready to bolt.
Structural Compliance and Certification Pathways
For projects targeting EU or North American markets, ASTM-standard H-beams require documentation that matches the structural drawing’s specified grade — a Q235B Q345B hot rolled H-beam I-beam supplier must provide traceable mill test certificates linking each piece to its heat number. [NEED_CITE: ASTM steel grade chemical composition and mechanical property requirements] Hot rolled black finish sections need no additional coating for indoor warehouse frames, but outdoor or corrosive environments demand either galvanizing or a specified paint system applied after fabrication. Third-party inspection through SGS or BV confirms dimensional accuracy and grade conformity before shipment, preventing customs holds at destination ports.
Understanding Q235B vs Q345B in Hot Rolled Sections
Q235B and Q345B belong to China’s GB/T 700 and GB/T 1591 carbon and low-alloy structural steel families, where the number indicates minimum yield strength in MPa. Q235B suits secondary structures, bracing, and light-load platforms where deflection governs design. Q345B offers higher yield strength for primary load-bearing columns and long-span rafters, reducing section weight while maintaining stiffness. Both grades weld readily using standard SMAW, GMAW, and FCAW processes without preheating in normal thickness ranges. The hot rolling process produces a mill scale surface that accepts primer coatings directly after blast cleaning, and the ±1% dimensional tolerance ensures predictable section modulus for structural calculations.
Hidden Costs of Unverified Section Steel Procurement
Ordering H-beams from a trader rather than a Q235B Q345B hot rolled H-beam I-beam supplier with direct mill access introduces three failure modes: grade substitution that fails structural inspection, negative tolerance stacking that reduces actual section modulus below design assumptions, and missing certification that triggers customs rejection at destination. [NEED_CITE: consequences of non-conforming structural steel in construction projects] Each failure costs more than the original purchase price — re-rolling, air freight, idle erection crews, and project penalties compound quickly.
Why Procurement Teams Choose Our Mill Direct
We roll Q235B and Q345B H-beams on three dedicated production lines covering over 2,800 section specifications, with wall thicknesses reaching 40 mm — including proprietary sharp-corner rectangular tube technology that fills gaps in global supply. Every heat undergoes chemical and mechanical testing in our in-house physical and chemical laboratory before release, and original mill test certificates travel with each shipment. Our quality management holds ISO 9001:2015 certification, Lloyd’s Register EU CE marking under EN 10210/10219, Singapore FPC approval, and verification through SGS and BV. We serve as designated supplier for multiple state-owned enterprises, central enterprises, and listed companies, exporting to over 50 countries across EU, North America, India, Southeast Asia, and Middle East markets. Professional loading plans optimize container utilization for 6–12 m lengths, and our logistics team coordinates FOB, CIF, and DDP terms with real-time tracking.
Documentation & Compliance
- Mill test certificate documenting Q235B and Q345B chemical composition and mechanical properties per heat number
- CE certificate confirming compliance with EN 10210/10219 for hot rolled structural sections exported to EU markets
- ISO 9001:2015 quality management system certificate covering production and inspection processes
- SGS or BV third-party inspection report verifying dimensional accuracy and grade conformity upon request
- Material traceability linking each beam to heat number, chemical analysis, and tensile test results
- Complete customs documentation including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Hot rolled Q235B and Q345B H-beams bundled with steel strips in seaworthy packaging, with edge protectors preventing damage to black mill scale finish during ocean transit
- Sections sorted by size and length within each bundle to facilitate offloading and site storage, with 6 m and 12 m lengths optimized for 20ft and 40ft container loading
- Each bundle tagged with heat number, steel grade, and dimensional specifications for traceability at destination port
- Custom cutting to project-specified lengths available before shipment, reducing on-site waste and handling
- FOB, CIF, and DDP shipping terms with professional loading plans maximizing container payload for H-beam sections
- Door-to-door logistics coordination with real-time tracking for projects across EU, North America, and Southeast Asia
Requesting a Structural Section Quote
Submit your project specifications including section size, steel grade (Q235B or Q345B), quantity, and destination port to receive a detailed quotation with unit pricing, production lead time, and applicable certification documentation. Our technical team reviews structural drawings to confirm section availability and can provide custom cutting, punching, or bending services to reduce your on-site fabrication scope.
Frequently Asked Questions
Q: What is the difference between Q235B and Q345B steel grades for H-beams?
A: Q235B is a carbon structural steel with lower yield strength suitable for secondary structures and light-load applications, while Q345B is a low-alloy high-strength structural steel offering higher yield strength for primary load-bearing members. Both grades weld readily and are available in the same section size range from our production lines.
Q: Can you provide custom cutting and welding services for H-beams?
A: Yes, our in-house processing shop offers cutting to project-specified lengths, punching for bolt holes, bending for curved members, and welding for built-up sections. These services reduce on-site fabrication time and material waste for your steel warehouse or construction project.
Q: What certifications do you have for exporting to EU and North American markets?
A: We hold Lloyd’s Register EU CE certification under EN 10210/10219 standards, ISO 9001:2015 quality management certification, Singapore FPC approval, and third-party verification through SGS and BV. Mill test certificates accompany every shipment for customs clearance and structural inspection compliance.
Q: How do you ensure dimensional accuracy and tolerance control?
A: Our in-house physical and chemical laboratory conducts incoming material inspection, in-process dimensional checks, and final inspection before shipment. Hot rolled H-beams maintain ±1% tolerance on flange and web thickness, with full inspection reports provided before loading.
Q: What is the delivery time and shipping options for international orders?
A: Typical production lead times apply based on order quantity and specification complexity. We offer FOB, CIF, and DDP shipping terms with professional loading plans optimizing container utilization for 6–12 m H-beam lengths, and real-time tracking through door-to-door logistics coordination.
Get Your Structural Steel Quote Today
Send your section specifications, steel grade requirements, and destination details to receive pricing with mill test certificates within hours.
Shandong Xin Jiyuan Special Steel Tube Co., Ltd
Website: www.sdxjysteel.com
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@sdxjysteel.com
Address: No.11889, Jingshi West Road, Lulian Group, Jinan City, Shandong Province, China
