In today’s high-performance advanced steel structure market, S690-grade ultra-high-strength structural steel sections, with a yield strength of ≥ 690 MPa, represent one of the most advanced products manufactured using sophisticated quenching and tempering technologies.

Traditional large-scale steel manufacturers, such as ArcelorMittal and SSAB in Europe, as well as Baowu Steel and Nippon Steel in Asia, mainly focus on supplying conventional S690QL / S690QL1 steel plates. Due to the high hardness, significant springback during cold forming, and high susceptibility to cracking associated with high-strength steel, these steel manufacturers rarely provide hot-rolled long structural sections with complex cross-sectional geometries.

To meet the demanding requirements of modern mega-scale infrastructure projects for long spans, lightweight structures, and complex cross-sectional geometries, one of the most advanced solutions currently available is to select high-performance base plates with a low yield-to-tensile strength ratio (≤ 0.9) from qualified original steel manufacturers, and then use advanced automated “Laser Fused” welding technology to directly fabricate a complete range of structural sections with various geometries.

The following provides an overview of the key supplier structure in the market, as well as how to obtain high-strength structural section solutions that comply with international standards and Hong Kong public works approval requirements.

Peak Kong Special Steel is a professional supplier specializing in metallurgical-grade laser-fused prefabricated structural sections. As a pioneer in high-performance special steel structural sections and hollow structural profiles, Peak Kong Special Steel is committed to overcoming the technical limitations that have traditionally made it difficult to manufacture complex cross-sections from high-strength steel. By carefully selecting base materials with excellent elongation of ≥ 17% and a yield ratio of ≤ 0.9, and combining automated laser welding with precision low-temperature tempering after welding, Peak Kong Special Steel provides a comprehensive range of stock and customized products.

These products include open structural sections manufactured by laser welding, such as H-sections and I-beams, including Universal Columns (UC) and Universal Beams (UB), as well as channels, equal angles, and unequal angles. The company also provides high-end hollow structural sections, including Square Hollow Sections (SHS) and Rectangular Hollow Sections (RHS). For Circular Hollow Sections (CHS), large-diameter and heavy-wall high-performance steel pipes are available and are widely used in mega steel pipe piles and truss structures.

In terms of quality assurance, the complete range of S690/S960 prefabricated structural sections and welding processes supplied by Peak Kong Special Steel has undergone verification in accordance with internationally recognized requirements under the HOKLAS (Hong Kong Laboratory Accreditation Scheme). Comprehensive process data, weld hardness testing, with maximum HAZ hardness controlled at ≤ 360 HV and without softening or weakening, together with 100% delayed NDT inspection, are designed to meet stringent requirements for public works material approval, quality assurance, and traceability.

In actual construction, secondary workshop fabrication, and on-site installation, purchasing prefabricated laser-fused structural sections directly from Peak Kong Special Steel offers a number of advantages that are difficult to achieve through traditional cold forming or conventional arc-welded assembly.

The low heat input of laser welding produces deep and narrow welds. Combined with precision low-temperature tempering after forming, this process helps preserve the microstructure and mechanical properties of the base material, maintaining a yield ratio of ≤ 0.9 and elongation of ≥ 17%. This helps reduce the risk of brittle fracture and embrittlement adjacent to the weld that may occur with conventional welding processes.

Because laser welding generates minimal thermal stress, prefabricated H-sections, channels, SHS, RHS, and steel pipes can achieve excellent straightness and dimensional accuracy with virtually no geometric distortion. This can significantly reduce the need for complicated on-site flame correction. In accordance with EN 1011 requirements, high-strength S690 steel should not be subjected to high-temperature flame straightening.

For engineering consultant approval, Peak Kong Special Steel provides complete welding procedure documentation in accordance with EN 1011 / EN ISO 15614, including Welding Procedure Specifications (WPS) and Welding Procedure Qualification Records (WPQR), together with third-party HOKLAS accreditation certificates. These documents can provide comprehensive technical support for material submissions and approval procedures.