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?

　　答：因為材料不一樣，一級鋼筋具有可塑性，三級鋼筋沒有可塑性。

　　Answer: Because the material is different, the first grade steel bar has plasticity, and the third grade steel bar has no plasticity.

　　規格直徑6-40mm的鋼筋，無論是一級鋼筋還是三級鋼筋還是四級鋼筋每米重量是相同的。可根據鋼筋米重公式計算=直徑*直徑*0.00617。Φ6鋼筋為0.222kg/米、Φ8鋼筋為0.385kg/米、Φ10鋼筋為0.617kg/米、Φ12鋼筋為0.888kg/米、Φ14鋼筋為1.209kg/米、Φ16鋼筋為1.579kg/米、Φ18鋼筋為1.999kg/米、Φ20鋼筋為2.468kg/米、Φ22鋼筋為2.986kg/米、Φ25鋼筋為3.856kg/米、以上型號基本上能滿足工程計算要求。（注：鋼筋直徑不分計算直徑、外徑）

　　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)

　　一級鋼筋與其它鋼筋的區別有哪些？

　　What are the differences between the first grade steel bar and other steel bars?

　　1、 外型不一樣，一級鋼外型光圓，無紋無肋，其它鋼筋表面外型有刻紋或有肋，這樣就造成圓鋼與混凝土的粘結力小，而其它鋼筋與混凝土的粘結力大。

　　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、 成份不一樣，圓鋼(一級鋼)屬于普通低碳鋼，其它鋼筋多為合金鋼。

　　2. Composition is different. Round steel (first grade steel) belongs to common low carbon steel, and other steel bars are mostly alloy steel.

　　3、 強度不一樣，圓鋼強度低，其它鋼強度高,即直徑大小相同的圓鋼與其它鋼筋相比，圓鋼所能承受的拉力要比其它鋼筋小，但圓鋼的塑性比其它鋼筋強，即圓鋼在被拉斷前有較大的變形，而其它鋼筋在被拉斷前的變形要小得多。

　　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.

　　更多有關濟南鋼筋批發的相關信息可以點擊我們的官網進行咨詢：http://www.ozhouu.com/

　　More information about Jinan reinforcing steel wholesale can be consulted by clicking on our official website: http://www.ozhouu.com/