方管以鋼管為多數(shù)，經(jīng)過拆包，平整，卷曲，焊接形成圓管，再由圓管軋制成方形管然后剪切成需要長度。一般是50根每包神傲方管在現(xiàn)貨方面以大規(guī)格居多在10*10*0.8-1.5~~500*500*10-25，方管用途為結(jié)構(gòu)方管，裝飾方管，建筑方管，機(jī)械方管等。

Square pipes are mostly steel pipes. After unpacking, flattening, crimping and welding, they form round pipes. Then they are rolled into square pipes and cut into required lengths. Generally, 50 square tubes per package are in large specifications at most 10*10*0.8-1.5-500*500*10-25. The square tubes are used as structural square tubes, decorative square tubes, building square tubes, mechanical square tubes and so on. 方管的重量計算公式 ：(邊寬a+邊寬b-2.8584×壁厚)×壁厚×0.0157×長度, 注意計算單位(邊寬與壁厚單位是毫米,長度是米).。 這種方法還適應(yīng)KQJ、KQF空心鋼計算.這種方法比較簡單,也容易記,在工礦企業(yè)常用.

The formulas for calculating the weight of square pipes are as follows: (side width a + side width b-2.8584 * wall thickness) * wall thickness * 0.0157 * length, pay attention to the unit of calculation (side width and wall thickness are millimeters, length is meters). This method is also suitable for calculation of KQJ and KQF hollow steel. This method is simple and easy to remember. It is commonly used in industrial and mining enterprises.

方管截面的長為a，寬為b，壁后為c，方管長度為l，方管密度為p，則

If the cross-section length of square tube is a, the width is b, the back of the wall is c, the length of square tube is l, and the density of square tube is p, then

重量=(ab-(a-2c)(b-2c))×l×p

Weight=(a b-(a-2c)(b-2c)*l*p

=2c（a+b-2c)×l×p

= 2c(a+b-2c)*l*p

=2clp(a+b-2c)

= 2clp(a+b-2c)

將上面的數(shù)字代入上式就可求出方管的重量了。但要注意各值的單位

The weight of the square tube can be calculated by substituting the above figures into the formula. But we should pay attention to the units of each value.

交貨重量的計算公式及允許偏差

Calculating Formula and Permissible Deviation of Delivery Weight

（1）邊長*4*壁厚*7.85*長度

(1) Edge length * 4 * Wall thickness * 7.85 * Length

（2）4*壁厚*（邊長-壁厚）*7.85*長度

(2) 4 * wall thickness * (side length - wall thickness) * 7.85 * length

一般（1)常用。如40MM*20MM*1.5MM 方管長度是850MM，就是：

Generally (1) commonly used. If the length of 40MM*20MM*1.5MM square tube is 850MM, that is:

（20+40）*2*1.5*7.85*850=0.012噸

(20+40)*2*1.5*7.85*850=0.012 tons