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Large-diameter Square Steel Pipe with High-frequency Welding and Galvanized Surface Treatment in 10*10-1000*1000mm Size Range

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Large-diameter Square Steel Pipe with High-frequency Welding and Galvanized Surface Treatment in 10*10-1000*1000mm Size Range

Packaging Details : Wooden Pallet or Wooden Box

W.T : 0.8-30mm

Certification : ISO 9001, ISO 14001, ISO 45001

Productivity : 10000tons/month

Surface Treatment : Galvanized(zinc coated), painted, oiled, powder coated, PVC coated ,or as clients' requirement

Payment Terms : L/C,D/A,D/P,T/T,Western Union

Size : 10*10-1000*1000mm

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

Delivery Time : 10-30 Days

Length : As customers demand

Steel Grades : Q195, Q235A-B, Q345A-E, 10#, 20#, 16Mn, ASTM A36,ASTM A500, ASTM A53, ASTM 106, SS400, St37, St52, S235JR, S355TRH etc

Supply Ability : 100000 Tons per month

Thickness Tolerance : ±0.05mm

Application : Building, structure, Fence

Place of Origin : China

MOQ : 1 piece

Production Technology : High-frequency welding.

O.D Tolerance : ±0.5mm

Brand Name : HA Steel

Packing : In bundles or bulk or as per customer's requirement

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Product Highlights
  1. 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
  2. Fully compliant with global industrial standards: ASTM A36, ASTM A500, GB/T 6728, GB/T 3094, EN 10210, EN 10219, JIS G3466
  3. Adopts mature high-frequency ERW welding production line, full online non-destructive inspection to eliminate welding internal defects
  4. Multiple customizable surface finishes: black bare, anti-rust oil, hot galvanizing, paint, powder coating, PVC coated for indoor/outdoor/marine environments
  5. Complete material grade portfolio: Q235B, S235JR, Q345B, S355JR, ASTM A36, A500 A/B/C, SS400, St37, St52
  6. Flexible length customization: fixed standard lengths (5.8m / 6m / 12m) or arbitrary cut-to-length per customer technical drawings
  7. 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
  8. Standard export bundled packaging with steel strips + waterproof plastic inner bag, safe for long-distance ocean transportation
Product Overview

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.

Material Grade Characteristics
ASTM A36 General Structural Carbon Steel
  • 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
ASTM A500 Grade Structural Square Tube (A/B/C)
  • 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
Q235B / S235JR Mild Carbon Steel
  • 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
Q345B / S355JR High Strength Low Alloy Steel
  • 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
Chemical Composition (Weight %)
1. Q235B / S235JR
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
2. Q345B / S355JR
Element C (Max) Si (Max) Mn (Max) P (Max) S (Max)
Content Range 0.24 ≤0.55 ≤1.60 0.035 0.035
3. ASTM A500 Grade B
Element C (Max) Si Mn (Max) P (Max) S (Max)
Content Range 0.26 Optional ≤1.35 0.035 0.035
4. ASTM A36
Element C (Max) Si (Max) Mn (Max) P (Max) S (Max)
Content Range 0.25 ≤0.40 ≤1.00 0.04 0.05
Related Material Grades

We supply matching square, rectangular, round hollow sections and alloy pipes for full structural & pipeline projects:

  1. Carbon Structural Hollow Section: Q235B/S235JR, Q345B/S355JR, ASTM A36, ASTM A500 A/B/C, SS400, St37/St52
  2. Conventional Round Carbon Pipe: ASTM A53, ASTM A106 Gr.B, API 5L line pipe
  3. High Temperature Alloy Pipe: ASME SA335 P11/P22/P91, ASTM A519 mechanical alloy tube
  4. Stainless Structural Tube: 304, 316L, 321 square & rectangular hollow sections
  5. Corrosion-Resistant Special Alloy: Alloy 28 seamless pipe, ASTM B167 nickel alloy tube
Key Advantages
Heavy Load Large-Size Capacity

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.

Precise Dimensional Tolerance

Side width tolerance ±0.5mm, wall thickness tolerance ±0.05mm, flat square surface for easy bolt connection and assembly.

Reliable ERW Welding Quality

High-frequency integrated welding line with online UT/eddy current non-destructive inspection, no hidden crack defects inside the weld seam.

Diversified Anti-Corrosion Surface Options

Black bare, oiled, hot galvanized, powder coated finishes available to adapt indoor, outdoor and coastal corrosive service environments.

Excellent Machinability & Weldability

Low-carbon steel matrix supports cutting, drilling, punching, bending and all mainstream welding processes for on-site fabrication.

Stable Production & Flexible Order

Monthly output 10,000 tons, accept small batch orders starting from 25 tons, controllable delivery cycle for global engineering orders.

Typical Applications
  • 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
Processing Service

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.

Quality Assurance

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.

Packing & Delivery
Packing

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

Lead Time

Normally 10 – 45 days after receipt of advance payment

Exact delivery time depends on order quantity, specification complexity and machining requirements


Quality Large-diameter Square Steel Pipe with High-frequency Welding and Galvanized Surface Treatment in 10*10-1000*1000mm Size Range for sale

Large-diameter Square Steel Pipe with High-frequency Welding and Galvanized Surface Treatment in 10*10-1000*1000mm Size Range Images

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