S960QLH Hollow Structural Sections / S960QL1H Steel Tubes / S960QLH Square Tubes / S960QLH Steel Tube Manufacturer

S960QLH / S960QL1H Ultra-High Strength Hollow Structural Sections
One-stop value-added solutions — High-power laser hybrid welded square / rectangular / circular tubes that fully overcome HAZ softening, pass CTOD tests and come with complete RT/UT NDT reports.

In modern long-span space trusses, mega-braces for super high-rise buildings and heavy offshore engineering designs, once the load-bearing capacity of conventional single tubes reaches its limit, switching to ultra-high strength steel tubular grades S960QLH (minimum yield strength ≥ 960 MPa) and S960QL1H (-60°C ultra-low temperature & ultra-high toughness) represents the ultimate solution to break mechanical performance bottlenecks.
Nevertheless, conventional welding processes for such Ultra-High Strength Steel (UHSS) tubes easily lead to severe softening and embrittlement within the Heat Affected Zone (HAZ).

Meanwhile, the high Minimum Order Quantity (MOQ) requirements imposed by major steel mills often hinder procurement for cutting-edge small-and-medium-sized projects.

Peakkong Special Steel adopts innovative technologies and introduces high-power laser hybrid welding systems together with custom section production lines to precisely manufacture world-class welded hollow structural sections in S960QLH / S960QL1H grades.
Centered on “adding value to customers’ projects”, we deliver a full suite of prefabrication services including precision cutting, splice welding & length extension, and offshore-grade anti-corrosion coating.

Every welded tube leaving our factory undergoes stringent Non-Destructive Testing (NDT) and comprehensive mechanical testing, with authoritative Radiographic Testing (RT) and Ultrasonic Testing (UT) reports supplied together with shipments.

Backed by flexible production lines, we effectively remove high MOQ barriers. Our products fully comply with European EN, American ASTM, British BS and Japanese JIS standards, helping you drastically streamline on-site work, cut total project costs and shorten construction schedules.
The welding procedures and fabricated components of this product series have successfully passed rigorous CTOD (Crack Tip Opening Displacement) tests and obtained SGS, DNV and TUV welding procedure approvals. Welding procedure qualifications are performed strictly in accordance with EN 15614-14 (laser-arc hybrid welding) and ASTM specifications, delivering safety and commercial compliance guarantees for onshore extreme heavy-load and deep-sea high-fatigue environments.

Product Supply Specifications for S960QLH / S960QL1H Hollow Structural Sections
Leveraging self-developed high-power laser hybrid welding technology and custom profile production lines, Peakkong Special Steel can produce custom tubes with tailored outer diameters, side widths and wall thicknesses according to project drawings. Weld seams and HAZ achieve full penetration, equal strength and top-tier toughness:

• Square Hollow Sections (SHS)

Wall thickness (T): 5mm to 30mm

• Rectangular Hollow Sections (RHS)

• Circular Hollow Sections (CHS)

Wall thickness (T): 5mm to 30mm

Professional NDT & RT/UT Inspection Reports
Premium RT/UT non-destructive inspection: Each batch is subject to high-precision Radiographic Testing (RT) and Ultrasonic Testing (UT) to ensure 100% full penetration of internal welds free of micro pores or cracks.

Test documentation: Shipment packages include original mill Material Test Certificates (MTC 3.1/3.2), RT/UT inspection reports, and Welding Procedure Approval Reports (WPAR) complying with EN 15614-11 / EN 15614-14, satisfying strict review requirements from architects, consultants and supervisors.

> Note: Low MOQ available. We can rapidly respond, schedule production and deliver even for small-batch special profiles at R&D stages, non-standard asymmetric tubulars and small-scale infrastructure projects.

Five Core Advantages of S960QLH / S960QL1H Hollow Structural Sections in Construction
1. Extreme structural lightweighting with remarkable benefits
Minimum yield strength reaches 960 MPa, 2.7 times that of conventional S355 steel. Under identical torsional stiffness, axial compression and bending load requirements, thinner tube walls can be adopted, reducing self-weight by over 40%–50%.

2. CTOD tested (superior brittle fracture resistance)
Splice welded joints have passed CTOD tests. This means the tubes retain excellent resistance against unexpected crack propagation under long-term high-cycle fatigue loads (e.g., lattice booms of crane arms) or sudden impact loads, completely eliminating the risk of catastrophic low-stress brittle fracture typical for ultra-high strength steel.

3. HAZ softening resolved via high-power laser hybrid welding
Fully compliant with international standard EN 15614-14. Precise control of ultra-low heat input and cooling microstructure during laser hybrid welding ensures no mechanical property degradation in the HAZ at tube joints.

4. European standard compliance
Products conform to the latest European high-strength hollow section standards EN 10210-3 (hot finished / heat treated) and EN 10219-3 (cold formed / quenched & tempered), while also compatible with ASTM, BS and JIS standards, enabling smooth international material submission approval for projects.

Typical Applications of S960QLH / S960QL1H Hollow Structural Sections
Space trusses & long-span venues
Steel tube trusses and reticulated shell structures for airport terminals, high-speed railway stations and large stadiums. Slimmer tube sizes achieve larger column-free spans with modern aesthetics and improved space efficiency.

Mega-bracing for super high-rise buildings
Suitable for Concrete-Filled Steel Tube (CFT) columns, outer-frame diagonal bracing and core wall structures of skyscrapers. Delivers ultra-high load capacity within compact space to maximize usable indoor floor area.

Premium offshore engineering & onshore wind facilities
Supported by DNV marine certification, CTOD fracture toughness and low-temperature impact resistance. Ideal for main chord members, foundation piles of offshore wind jackets, offshore drilling platforms and heavy lift arm frameworks on marine vessels.

Super heavy construction machinery & lifting equipment
Widely used for lattice booms of thousand-ton crawler cranes and all-terrain mobile cranes, telescopic booms of aerial work platforms and heavy mining machinery, substantially improving fatigue life and load limits of equipment.

Contact Us
If you are planning extreme steel structures, mega infrastructure, high-rise buildings or advanced offshore projects, and are seeking world-class ultra-high strength square/rectangular/circular steel tubes with flexible MOQ, multi-standard compliance, EN 15614 qualification, CTOD certification, RT/UT inspection reports and integrated fabrication services:

Should you require information on S960QLH/S960QL1H Ultra-High Strength Hollow Structural Sections (Square / Rectangular / Circular Tubes), RT/UT test reports and coating services, please feel free to contact us.

Peakkong Special Steel provides one-stop solutions for state-of-the-art, safe and globally certified special steel products.