In modern industry and construction, S355 low alloy high strength steel grating has become a popular choice due to its high load-bearing capacity, corrosion resistance and long service life. However, for users, the actual life of the material is directly related to the cost and benefit of the project. How long is the service life of S355 steel grating? What factors affect its performance?
This article will reveal the secret to you in detail!
S355/Q355 steel grating is known for its superior material properties, and its life mainly depends on the following two points:
Basic material properties
S355/Q355 low alloy steel has good strength and toughness, and its yield strength is as high as 355MPa, which can withstand heavy loads and complex environmental erosion for a long time.
Surface treatment process
S355/Q355 steel grating is usually protected by hot dip galvanizing, which can effectively resist corrosion. The life of high-quality galvanized layer can reach more than 30 years in ordinary outdoor environment, and can last more than 15 years in highly corrosive environment.
On the whole, under normal use conditions, the design life of S355/Q355 steel grating is generally between 20-50 years.
| Compare Projects | Q235 | Q355 |
| Material Type | Ordinary carbon structural steel | Low alloy high strength structural steel |
| Yield Strength | ≤235MPa | ≤355MPa |
| Tensile Strength | 370-500MPa | 490-630MPa |
| Carbon content | 0.14%-0.22% | 0.12%-0.20% |
| Alloying elements | Contains small amounts of copper, nickel, chromium, vanadium and other elements | Contains small amounts of copper, chromium, nickel and other elements, with added alloying elements such as manganese, silicon, vanadium, niobium and titanium |
| Silicon content | ≤0.35% | ≤0.55% |
| Manganese content | ≤1.40% | 1.00-1.60% |
| Phosphorus content | ≤0.045% | ≤0.030% |
| Sulfur content | ≤0.050% | ≤0.030% |
| Toughness | Poorer than Q355 | Better, not easy to break when impacted or squeezed |
| Corrosion resistance | Poor, suitable for general environment | Better, suitable for harsh environments such as marine engineering |
| Processing performance | Low carbon content, good plasticity, easy to cold work and weld | Relatively high carbon content, good work hardening performance, but more prone to breakage than Q235 during cold deformation |
| Color | Visibly bluish | Redness visible to the naked eye |
| Purpose | Widely used in common structural steel, such as general building structures, steel bars, factory building frames, high-voltage transmission towers, bridges, vehicles, boilers, containers, ships, etc. | Widely used in places requiring high force and good wear resistance, such as bridges, vehicles, ships, buildings, pressure vessels, special equipment, marine engineering, etc. |
| Price | Relatively low | Relatively high |
Use environment
Ordinary environment: In an environment with dry air and less pollution, the life of S355/Q355 steel grating is longer.
Highly corrosive environment: such as chemical plants, coastal areas and sewage treatment plants, corrosive substances will accelerate the loss of the galvanized layer, but S355/Q355 material can still maintain good corrosion resistance.
Load conditions
Long-term overload use may cause fatigue damage to the steel grating, so it is crucial to design the load reasonably.
Installation and maintenance
Installation quality: Correct installation can reduce stress concentration and avoid premature damage.
Daily maintenance: Timely cleaning of surface dirt and corrosion can effectively extend the service life.
Surface coating thickness
The thickness of the galvanized layer directly affects the anti-corrosion performance of the steel grating. The thicker the galvanized layer, the stronger the protection ability and the longer the life.
Material type Service life. Applicable environment Ordinary carbon steel grating 5-10 years. Indoor or low corrosion environment S235/Q235 hot-dip galvanized steel grating 15-25 years. Ordinary outdoor environment S355 hot-dip galvanized steel grating 20-50 years.
Compared with other materials, S355/Q355 low alloy high strength steel grating has a longer life, especially in high load and high corrosion environment.
Optimize design
Choose suitable specifications and models according to actual working conditions to avoid overload.
Choose high-quality surface treatment
It is recommended to use a thick galvanized layer or spray anti-corrosion paint double protection process.
Regular maintenance
Inspect annually, clean impurities in time and repair damaged parts of the surface coating.
Choose a reliable manufacturer
Purchase products from manufacturers with a good reputation to ensure material quality and process level.
S355/Q355 low alloy high strength steel grating plate can show extremely high durability and reliability in various environments due to its superior performance and advanced surface treatment technology. Whether it is a common industrial platform, municipal engineering, or highly corrosive chemical industry, its service life can reach 20-50 years or even longer.
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#S355 steel grating #Q355 steel grating #low alloy grating
