Today I'm talking about the first grade steel bar, round steel. From the steel price list, the first grade steel bar is more expensive than the third grade steel bar? From the point of view of technology, the third-grade steel bar is spiral, and the first-grade steel bar is smooth and round. It is relatively easier to make than the third-grade steel bar. What is the reason?
Answer: Because the material is different, the first grade steel bar has plasticity, and the third grade steel bar has no plasticity.
The weight per meter of steel bars of 6-40 mm in diameter is the same whether they are grade I or grade III or grade IV. According to the formula of the meter weight of reinforcing bars, it can be calculated to be equal to diameter * diameter * 0.00617. 6 steel bars 0.222kg/m, 2kg/m, 8steel bars 0.385kg/m, 10steel bars 0.617kg/m, 10steel bars 0.617kg/m, kg/m, 12 steel bars 0 888kg/m, kg/m, kg/m, 1.579kg/m, kg/m, 1.579kg/m, 16steel bars 1 kg/m, kg/m, 8kg/m, 2.4688kg/m The results of this study are as follows:1. (Note: Diameter of reinforcing bar does not include calculated diameter and external diameter)
What are the differences between the first grade steel bar and other steel bars?
1. The appearance of the first grade steel is smooth and round, without ribs, and the surface of other steel bars is marked or ribbed, which results in the small bonding force between round steel and concrete, while the bonding force between other steel bars and concrete is large.
2. Composition is different. Round steel (first grade steel) belongs to common low carbon steel, and other steel bars are mostly alloy steel.
3. Strength of round steel is different, strength of round steel is low, strength of other steels is high, that is, round steel with the same diameter can bear less tension than other steel bars, but the plasticity of round steel is stronger than other steel bars, that is, round steel has greater deformation before being pulled off, while other steel bars have much smaller deformation before being pulled off.
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