S460QL

S460QL steel plate is a low-alloy high-strength steel. Its material composition is mainly carbon, manganese and silicon, supplemented by trace elements such as chromium, nickel and molybdenum. At the same time, it adopts quenching and tempering process (Q+T) to make its minimum yield strength reach 460MPa. It still maintains good toughness in low temperature environment, and the impact value can reach ≥30J at -40℃. It is often used in heavy machinery, bridge structure, shipbuilding and high-rise buildings.

EN10025-6 S460QL Carbon and Low-alloy High-strength Steel Plate Mechanical Property

High Strength Performance
The yield strength of S460QL steel plate is as high as 460MPa, while the yield strength of ordinary structural steel such as Q235 is only about 235MPa. This high strength comes from its optimized combination of low alloy components (such as about 0.40-0.50% chromium, 0.20-0.30% molybdenum and 0.50-0.80% nickel), as well as the effects of high temperature heating and rapid cooling in the quenching and tempering (Q&T) heat treatment process. This feature makes the steel plate particularly suitable for scenes requiring high strength such as bridges, crane arms and heavy machinery.

Excellent Low Temperature Toughness
In the -40℃ low temperature impact test, the impact energy value of S460QL steel plate reached ≥30J, which means that the steel plate can absorb energy greater than or equal to 30 joules (J) without brittle fracture. In contrast, the impact absorption energy of ordinary structural steel below -20℃ is usually less than 10J, so it is prone to brittle fracture. This feature makes it widely used in Arctic construction, refrigerated storage equipment, and low-temperature oil and gas pipelines, which can effectively reduce safety accidents caused by low-temperature fractures. For example, in a certain Arctic oil platform project, after using S460QL steel plates, the structural failure rate in extremely cold environments decreased by 35%, and the operating life of the equipment was significantly extended.

Excellent Welding Performance
The carbon equivalent of S460QL steel plates is usually controlled at ≤0.45, which has a direct impact on welding performance. Carbon equivalent is an indicator for evaluating the weldability of steel. The lower the carbon equivalent, the smaller the hardening tendency of the welding heat affected zone and the lower the risk of welding cracks. The tensile strength of the welded joint of S460QL steel plate reaches 560MPa, and the impact energy value of the welding heat affected zone can be stabilized at ≥25J. This performance is particularly prominent in shipbuilding. For example, in a large container ship project, after using S460QL steel plates, the welding efficiency increased by 15% and the welding defect rate decreased by 20%.

Good Corrosion Resistance
The addition of chromium and nickel in S460QL steel plate is 0.3%-0.5% and 0.2%-0.6% respectively, which effectively improves the corrosion resistance of the steel plate. Chromium and nickel prevent oxidation and corrosion of the steel plate by forming a dense chromium oxide protective film on the steel surface, blocking further penetration of oxygen and moisture. In the salt spray test, the corrosion resistance time of S460QL steel plate exceeded 480 hours, while ordinary steel was only 120 hours. This performance prolongs its service life in the marine environment by about 50% and reduces maintenance costs by 20%.

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