S355J0WP is a high-strength, low-alloy structural steel resistant to atmospheric corrosion, conforming to the European standard EN 10025-5, with the material designation 1.8945. It is a cost-effective weathering steel for outdoor, uncoated structural projects. As a core grade in the EU weathering steel series, it combines high mechanical strength, stable low-temperature toughness at 0°C, and the ability to form a self-protective rust layer, distinguishing it from ordinary carbon structural steel and other lower-grade weathering steels.
304 and 316 are the two most widely used austenitic stainless steel grades globally and are commonly adopted across numerous industries due to their stable performance and manageable costs. This article provides a systematic comparison of these two grades across four dimensions—chemical composition, mechanical properties, corrosion resistance, and application scenarios—to serve as a basis for accurate material selection.
Thanks to its lightweight and high-strength structural properties, bulb flat bar is widely used in shipbuilding, offshore engineering, port facilities, and heavy industrial structures, serving as a key structural component for reinforcing ship structures and providing load-bearing support.
Accurate specification selection is the foundation for the safe and proper use of bulb flat bar. The production and application of bulb flat bar comply with unified international standards such as ASTM A131, EN 10067, and GB/T 9945, which provide a comprehensive set of specifications covering dimensions, steel grades, mechanical properties, and dimensional tolerances, and meet the inspection and certification requirements of major classification societies such as ABS, LR, BV, DNV, and CCS.
Bulb flat bar is widely used in ship hull frames, deck stiffeners, offshore wind turbine support structures, offshore platform components, and industrial building structural frames. Its unique cross-sectional geometry makes it the preferred stiffening profile in marine engineering, offering superior performance compared to ordinary flat steel and other traditional steel sections.