September 25, 2025

GB/T700 (general carbon structural steels) and GB/T1591 (low-alloy high-strength structural steels) serve different parts of the market: GB/T700 grades such as Q235 remain the cost-efficient choice for routine structural work, while GB/T1591 grades (Q345, Q390, Q420, etc.) demand a price premium because of alloying, tighter mechanical control and wider application in heavier structures and demanding […]

for 2025 we find A656 / S355J2 structural plate selling in widely different bands around the world — roughly USD 620–1,100 per metric tonne depending on origin, mill finish, thickness and delivery terms. If you need consistent weldable, normalized S355J2 plate for structural work, plan procurement around thickness, mill certification and transport lead time —

We recommend A709 / S355J0W for outdoor structural components where enhanced atmospheric corrosion resistance and reliable bridge-grade mechanical performance are required; it balances long-term maintenance savings with robust strength characteristics. Standards and designation: how A709 and S355J0W relate We treat “A709 / S355J0W” as a composite designation used by fabricators and buyers to indicate a