Description
Factory-Direct Galvanized SHS & RHS — Every Q195–Q345 tube ships with original mill test certificates and heat-number traceability, cutting out trader markups on structural hollow sections.
Technical Specifications + Markdown 表格
| Parameter | Value |
|---|---|
| Designation | Galvanized Square and Rectangular Steel Tube |
| Product Type | Square / Rectangular Steel Tube (SHS / RHS) |
| Steel Grade | Q195, Q235, Q345, ASTM A53, SGCC, CGCC, TDC51DZM, TDC52D, TS350GD, TS550GD, DX51D+Z, 10#, 20#, 45#, 16Mn, St37, St42, St37-2, St35.4, St52.4, ST35 |
| Standard | API 5L, ASTM A53, ASTM A671, ASTM A252, ASTM A450, ASME B36.10M, ASTM A523, BS 1387, BS EN10296, BS 6323, BS 6363, BS EN10219, GB/T 3091, GB/T 13793, GB/T 9711, JIS, DIN, GB, ASME |
| Section Shape | Square / Rectangular / Round |
| Size Range | Outer Diameter 20 mm – 508 mm |
| Wall Thickness | 1 mm – 12 mm |
| Length | 1 m – 12 m (5 m, 5.8 m, 6 m, 10 m, 12 m or customized) |
| Technique | Cold Rolled / Hot Rolled |
| Surface Treatment | Galvanized; PVC coating; Black and color painting; Transparent oil; Anti-rust oil |
| Tolerance | ±1% |
| Ends | Plain end / Beveled end; Protected by plastic caps; Cut square, grooved, threaded, with coupling |
| Application | Steel structures / Construction frames / Scaffolding / Fencing / Greenhouse / Low-pressure liquid transport (water, gas, oil) / Indoor and outdoor building construction |
| MOQ | 1 Ton |
| Origin | Shandong, China |
Application Suitability
| Industry | Typical Applications |
|---|---|
| Construction & Infrastructure | Scaffolding systems, building columns, structural frames for high-rise and bridge projects |
| Agricultural & Commercial | Greenhouse support frames, perimeter fencing, door and window frames |
| Fluid Transport | Low-pressure water supply lines, gas distribution pipes, oil transport pipelines |
| Steel Fabrication | Heavy equipment frames, conveyor structures, mezzanine supports |
What Wall-Thickness Tolerance Costs on a Structural Frame Order
±1% wall thickness tolerance keeps structural calculations valid and prevents fabrication rework.
When galvanized square and rectangular steel tubes arrive with hidden negative tolerance, the actual load-bearing capacity drops below design specs. Fabricators discover this only after cutting — when weld seams don’t align or connection plates sit unevenly. Missing mill test certificates compound the problem: without verified chemical composition and mechanical properties, customs clearance stalls and engineering sign-off fails. [NEED_CITE: EN 10219 cold-formed hollow section dimensional tolerance requirements]
How Galvanized SHS & RHS Match Structural Engineering Demands
Galvanized square and rectangular steel tubes in Q195–Q345 grades deliver the corrosion resistance and dimensional stability that structural frames require. The zinc coating protects against atmospheric corrosion in outdoor scaffolding and greenhouse applications, while ±1% wall thickness tolerance ensures predictable load distribution across building columns. Custom cutting to exact lengths eliminates on-site waste and accelerates assembly for construction crews working under tight schedules.
Engineering Compliance and Certification Requirements
Structural hollow sections must meet dimensional and mechanical standards before engineers approve them for load-bearing applications. [NEED_CITE: ASTM A500 structural tubing specifications for building frames] Galvanized SHS and RHS in Q235 and Q345 grades conform to GB/T 3091 and GB/T 13793 for Chinese projects, while ASTM A53 and EN10219 equivalents serve North American and European markets. Original mill test certificates documenting heat number, chemical composition, and mechanical properties are mandatory for customs clearance and engineering verification. CE certification under EN10219 enables duty-free entry into EU member states, while SGS or BV third-party inspection reports satisfy client-specific quality requirements.
Steel Grade Selection and Surface Treatment Logic
Q195 offers formability for light-duty fencing and greenhouse frames where high strength isn’t critical. Q235 balances weldability and strength for general construction scaffolding and structural frames. Q345 delivers higher yield strength for heavy-load applications like building columns and bridge supports. [NEED_CITE: steel grade equivalence between GB Q-series and EN S-series standards]
Hot-dip galvanizing provides superior corrosion protection for outdoor exposure, while PVC coating adds chemical resistance for industrial environments. Transparent oil and anti-rust oil suit temporary protection during transit or indoor applications where appearance matters less. Cold-rolled tubes offer tighter dimensional tolerance and smoother surface finish for architectural applications, while hot-rolled tubes handle thicker walls above 6 mm for heavy structural work.
Hidden Costs of Wrong Grade or Missing Certification
Specifying Q235 when the design calls for Q345 means the structure fails load tests — forcing complete replacement and project delays. Missing mill test certificates trigger customs holds at destination ports, demurrage charges pile up, and clients demand air freight for replacement material. [NEED_CITE: mill test certificate requirements for structural steel imports] Negative tolerance beyond ±1% reduces actual wall thickness, compromising structural integrity and voiding engineering warranties. These aren’t theoretical risks — they’re recurring problems in projects where buyers prioritize lowest price over verified quality.
Why Source Galvanized SHS & RHS from Xin Jiyuan
Every galvanized square and rectangular steel tube ships with original mill test certificates showing heat number, chemical composition, and mechanical properties — full traceability from steel mill to your job site. ISO 9001:2015 and CE certification under EN10219 ensure compliance with international quality standards, while SGS and BV third-party inspection reports satisfy client-specific requirements. Custom cutting, punching, bending, threading, and grooving to exact project specifications eliminate on-site fabrication waste. Professional heavy cargo loading using flatbed trucks, open-top containers, and break-bulk shipping prevents damage during ocean transit. Dedicated specification matching ensures you receive the exact steel grade, wall thickness, and length your project requires — no substitutions, no surprises.
Documentation & Compliance
- Mill test certificate documenting Q235 or Q345 chemical composition and yield strength per GB/T 3091 or EN10219
- CE certificate confirming EN10219 compliance for structural hollow sections entering EU markets
- ISO 9001:2015 quality management certificate covering production and inspection processes
- SGS or BV third-party inspection report verifying dimensional tolerance and coating thickness
- Material traceability by heat number linking each tube to its original steel batch
- Customs documents including packing list, bill of lading, and certificate of origin
Packaging, Loading & Delivery
- Galvanized tubes bundled with edge protectors and steel strips to preserve zinc coating during ocean transit
- Surface protection using transparent oil or anti-rust oil for tubes requiring temporary corrosion resistance
- Container loading optimization for 6 m and 12 m lengths maximizes payload while respecting weight limits
- Custom cut-to-length service delivers tubes in 5 m, 5.8 m, or project-specific lengths reducing on-site waste
- Heat number and steel grade marked on each tube for traceability and inspection verification
- FOB, CIF, and DDP shipping terms with professional flatbed and open-top container loading
How to Request a Quote for Your Project
Submit your required steel grade, outer diameter, wall thickness, length, quantity, and destination port — we respond within 12 hours with detailed pricing including material cost, custom processing fees, and shipping terms. Request original mill test certificates and CE documentation to verify compliance before placing your order. Confirm custom cutting, threading, or grooving requirements to receive accurate processing quotes. Our team provides specification matching and logistics planning to ensure your galvanized square and rectangular steel tubes arrive on time and within budget.
Frequently Asked Questions
Q: What is the difference between Q235 and Q345 for structural applications?
A: Q235 offers good weldability and formability for general construction scaffolding and light structural frames. Q345 provides higher yield strength for heavy-load applications like building columns and bridge supports where structural integrity is critical.
Q: Can you provide custom cut-to-length services for galvanized tubes?
A: Yes, we offer custom cutting to exact lengths including 5 m, 5.8 m, 6 m, or project-specific dimensions. This reduces on-site fabrication waste and accelerates construction assembly.
Q: How do you ensure coating thickness consistency on galvanized tubes?
A: Each production batch undergoes coating thickness verification before shipment. Original mill test certificates document surface treatment specifications, and SGS or BV third-party inspection is available for additional verification.
Q: What documentation do you provide for customs clearance?
A: We supply original mill test certificates, CE certificates for EU markets, ISO 9001:2015 quality certificates, packing lists, bills of lading, and certificates of origin. All documents include heat number traceability for material verification.
Q: What is the minimum order quantity for galvanized square and rectangular tubes?
A: The minimum order quantity is 1 ton. We serve both small fabrication shops requiring limited quantities and large construction projects needing bulk supply.
Get Your Galvanized SHS & RHS Quote with Mill Test Certificates
Submit your specifications — steel grade, dimensions, quantity, and destination — to receive detailed pricing and original mill test certificates within 12 hours.
Contact:
Tel: +86 531 8573 6315
Mobile/WhatsApp/WeChat: +86 188 5315 7756
Email: admin@xjyplate.com
