Strength and Corrosion Resistance of Q215BC Section Steel

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Strength and Corrosion Resistance of Q215BC Section Steel

Strength

Strength is the ability of metal materials to resist damage from static loads. It is generally divided into tensile strength, compressive strength, shear strength and bending strength. The higher the strength, the more resistant it is to fracture or deformation under load. Strength is determined by a number of tests on a sample of the material with specific dimensions. The specimen is fixed at one end and pulled from the other. The resulting tensile stress and the percentage of elongation besides failure section contraction are reported.

Steels with a high strength C-shaped steel can provide substantial weight and cost savings compared to lower strengths. However, high strength increases the possibility of cracking due to fatigue and requires careful design to reduce the probability of crack growth in service.

To control the risk, designers can use a modified set of thickness limits for structural members in a building to reduce the effect of fatigue on their structural integrity. The Eurocode design rules also require that the tensile strength of steels used in buildings be at least equivalent to the design loads on them. This is necessary to reduce the rate at which cracks start to grow in a structure, which can lead to eventual catastrophic failure. In order to achieve this, the material has to have a high impact toughness, which is defined by the product standards for the relevant grades of steel.

Corrosion Resistance

The corrosion resistance of steel depends on a combination of factors, including alloying elements and DX53 galvanized steel coil heat treatment. Chromium, for instance, improves corrosion resistance by forming a protective chromium oxide passive film. Molybdenum and nitrogen also aid in corrosion resistance to a lesser extent by helping support the chromium oxide film. Alloying elements that form carbides or nitrides, however, can deplete the amount of chromium available for corrosion resistance. This is known as sensitization and can be countered by lowering the chromium content or by tempering at low temperatures.

Stainless steels with high bulk chromium content tend to have good corrosion resistance, as is the case for Vanax, the top steel in the chart above. Some tool steels like A8 Mod, 3V and CruWear are also high in the chart despite having lower chromium levels. This is likely because these steels are tempered at low temperatures which helps retain a higher level of chromium in solution.

The highest non-stainless steel on the chart is 440A which has high corrosion resistance despite its relatively low Cr content. The steels that have the lowest corrosion resistance in this chart are XHP and ZDP-189. These two steels have very low Cr-equivalent based on the chart, though it is important to remember that thermodynamic software can give inaccurate estimates of alloy in solution.

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