圆钢是使用范围最广的一种材料,锻坯也常使用圓钢,这就经常需要对圓钢进行材料计算。一般的算料工具有计算尺、算料盘和计算器等。在没有携带这些工具的情况下就很不方便。作者在算料实践中总结了同一长度不同直径的圆钢,如100mm长、φ20～φ280圆钢的重量变化规律,编写了口诀式的 Round bar is the most widely used type of material, forged billet is also often used round bar, which often need to round bar material calculations. The general counting tools are slide rule, counting plate and calculator. It can be very inconvenient without the tools. The author summarizes the weight of the same length in the practice of different sizes of round bars, such as the length of 100mm, φ20 ~ φ280 round bar weight changes, prepared a formula