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Low Alloy Structural Steel
1. Purpose
Mainly used in the manufacture of bridges, ships, vehicles, boilers, high-pressure vessels, oil and gas pipelines, large steel structures, etc.
2. Performance requirements
● High strength: generally its yield strength is above 300MPa.
● High toughness: the elongation is required to be 15% to 20%, and the impact toughness at room temperature is greater than 600kJ/m to 800kJ/m. For large welded components, high fracture toughness is also required.
● Good welding performance and cold forming performance.
● Low cold-brittle transition temperature.
● Good corrosion resistance.
3. Ingredient characteristics
● Low carbon: Due to the high requirements for toughness, weldability, and cold formability, the carbon content does not exceed 0.20%.
● Add manganese-based alloying elements.
● Adding auxiliary elements such as niobium, titanium, or vanadium: a small amount of niobium, titanium or vanadium forms fine carbides or carbonitrides in steel, which is beneficial to obtaining fine ferrite grains and improves the strength and toughness of steel.
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