Large-diameter Square Steel Pipe with High-frequency Welding and Galvanized Surface Treatment in 10*10-1000*1000mm Size Range
Product Details
| Size: | 10*10-1000*1000mm | O.D Tolerance: | ±0.5mm |
|---|---|---|---|
| W.T: | 0.8-30mm | Length: | As Customers Demand |
| Thickness Tolerance: | ±0.05mm | Surface Treatment: | Galvanized(zinc Coated), Painted, Oiled, Powder Coated, PVC Coated ,or As Clients' Requirement |
| Steel Grades: | Q195, Q235A-B, Q345A-E, 10#, 20#, 16Mn, ASTM A36,ASTM A500, ASTM A53, ASTM 106, SS400, St37, St52, S235JR, S355TRH Etc | Standard: | GB/T 3094-2000, GB/T 6728-2002, DIN EN 10210, DIN EN 10219, GB/T 178-2005，ASTM A53, ASTM A500,BS EN 10219,JIS G 3466, ASTM A513, ASTM A36 |
| Productivity: | 10000tons/month | Packing: | In Bundles Or Bulk Or As Per Customer's Requirement |
| Application: | Building, Structure, Fence | Production Technology: | High-frequency Welding. |
Product Description
- Large-size carbon square hollow structural section, side dimension range 10×10mm up to 1000×1000mm, wall thickness 0.8–30mm for heavy-load large engineering projects
- Fully compliant with global industrial standards: ASTM A36, ASTM A500, GB/T 6728, GB/T 3094, EN 10210, EN 10219, JIS G3466
- Adopts mature high-frequency ERW welding production line, full online non-destructive inspection to eliminate welding internal defects
- Multiple customizable surface finishes: black bare, anti-rust oil, hot galvanizing, paint, powder coating, PVC coated for indoor/outdoor/marine environments
- Complete material grade portfolio: Q235B, S235JR, Q345B, S355JR, ASTM A36, A500 A/B/C, SS400, St37, St52
- Flexible length customization: fixed standard lengths (5.8m / 6m / 12m) or arbitrary cut-to-length per customer technical drawings
- Stable monthly production capacity up to 10,000 tons, low MOQ of 25 tons; flexible trade & payment terms: FOB/CFR/CIF, T/T & L/C available
- Standard export bundled packaging with steel strips + waterproof plastic inner bag, safe for long-distance ocean transportation
Large-diameter square steel pipe is heavy-duty cold-formed ERW welded hollow structural section, specially designed for large-span building frames, heavy machinery supports, municipal infrastructure and oversized engineering equipment.
The whole production workflow includes uncoiling, flattening, roll forming, high-frequency welding, deburring, water cooling, NDT inspection, sizing cutting and surface finishing. All finished large square tubes pass strict dimensional tolerance inspection (side tolerance ±0.5mm, wall tolerance ±0.05mm) before warehousing.
Compared with small square tubes, this large series features thicker wall options and ultra-wide side sizes to bear heavier static & dynamic loads. We support custom surface anti-corrosion treatment and secondary cutting, punching, bending processing, widely supplied to global construction, machinery, municipal and agricultural engineering customers.
- Universal low-carbon structural grade for medium-load frames, min tensile strength 400–550MPa, min yield ≥250MPa
- Excellent cold forming, punching and welding performance, low impurity sulfur & phosphorus, stable long-term service indoors
- Cost-effective conventional structural material for general building & decoration projects
- Cold-formed welded hollow section dedicated for structural load-bearing
- Grade A: Min tensile 310MPa, yield 269MPa, elongation ≥25% for light load structures
- Grade B: Min tensile 400MPa, yield 317MPa, elongation ≥23% — most widely used standard grade
- Grade C: Min tensile 427MPa, yield 345MPa, elongation ≥21% for heavy-load large-span engineering
- Uniform wall thickness and symmetrical square cross-section with superior torsional rigidity
- Economical general structural steel, min yield strength ≥235MPa, outstanding weldability for ordinary construction frames
- Stable mechanical property under normal temperature, suitable for indoor structure, fence and light equipment supports
- High-strength structural grade, min yield ≥345MPa, higher load capacity than Q235/S235
- Ideal for large-span workshops, bridge auxiliary supports, heavy machinery base frames
| Element | C (Max) | Si | Mn | P (Max) | S (Max) |
|---|---|---|---|---|---|
| Content Range | 0.17~0.22 | ≤0.35 | 0.30~0.70 | 0.045 | 0.045 |
| Element | C (Max) | Si (Max) | Mn (Max) | P (Max) | S (Max) |
|---|---|---|---|---|---|
| Content Range | 0.24 | ≤0.55 | ≤1.60 | 0.035 | 0.035 |
| Element | C (Max) | Si | Mn (Max) | P (Max) | S (Max) |
|---|---|---|---|---|---|
| Content Range | 0.26 | Optional | ≤1.35 | 0.035 | 0.035 |
| Element | C (Max) | Si (Max) | Mn (Max) | P (Max) | S (Max) |
|---|---|---|---|---|---|
| Content Range | 0.25 | ≤0.40 | ≤1.00 | 0.04 | 0.05 |
We supply matching square, rectangular, round hollow sections and alloy pipes for full structural & pipeline projects:
- Carbon Structural Hollow Section: Q235B/S235JR, Q345B/S355JR, ASTM A36, ASTM A500 A/B/C, SS400, St37/St52
- Conventional Round Carbon Pipe: ASTM A53, ASTM A106 Gr.B, API 5L line pipe
- High Temperature Alloy Pipe: ASME SA335 P11/P22/P91, ASTM A519 mechanical alloy tube
- Stainless Structural Tube: 304, 316L, 321 square & rectangular hollow sections
- Corrosion-Resistant Special Alloy: Alloy 28 seamless pipe, ASTM B167 nickel alloy tube
Side size up to 1000×1000mm and wall thickness up to 30mm, perfect for large-span workshop columns, heavy equipment bases and municipal large support frames.
Side width tolerance ±0.5mm, wall thickness tolerance ±0.05mm, flat square surface for easy bolt connection and assembly.
High-frequency integrated welding line with online UT/eddy current non-destructive inspection, no hidden crack defects inside the weld seam.
Black bare, oiled, hot galvanized, powder coated finishes available to adapt indoor, outdoor and coastal corrosive service environments.
Low-carbon steel matrix supports cutting, drilling, punching, bending and all mainstream welding processes for on-site fabrication.
Monthly output 10,000 tons, accept small batch orders starting from 25 tons, controllable delivery cycle for global engineering orders.
- Large building engineering: Factory workshop columns, roof trusses, large-span steel frame structures
- Municipal infrastructure: Large traffic guardrail, bridge auxiliary support, tunnel structural components
- Heavy mechanical manufacturing: Large equipment base, conveying rack, mining machinery frame
- Logistics & storage: Oversized warehouse shelf, heavy load storage rack structure
- Agricultural facilities: Large greenhouse main skeleton, breeding equipment heavy supports
- Decoration & engineering: Oversized exhibition stand, large outdoor billboard support frame
We provide integrated forging and precision machining services, and can produce finished components strictly according to customer drawings:
Turning, milling, planing, drilling, boring, grinding
Gear cutting, CNC precision machining
Sizing cutting, surface treatment and finishing
We have supplied a wide range of forged and machined parts including shafts, cylinders, hollow bars, pistons, tube sheets, rings and disc bearings to customers worldwide.
We have a professional QC inspection team and complete testing equipment to ensure stable and reliable product quality:
Ultrasonic testing (UT) for internal defects
Tensile and hardness testing for mechanical properties
High-precision dimensional measurement
Spectrometer for chemical composition verification
Metallographic microstructure inspection
Every batch of products undergoes strict inspection before delivery to meet the quality requirements of various engineering projects.
Inner packaging: waterproof polybag for moisture and dust protection
Outer packaging: reinforced wooden case / wooden pallet, suitable for long-distance international transportation
Custom packaging solutions available upon request
Normally 10 – 45 days after receipt of advance payment
Exact delivery time depends on order quantity, specification complexity and machining requirements
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