The density of stainless steel pipe
is higher than carbon steel .so its parameter is not the same , in the above we mentioned that the weight of the stainless pipe is (D-r)*r*0.02466*L, this formula is for carbon steel tube ,if the pipe is stainless tube then its formula should be as follows: (D-r)*r*0.02491*L , other issue like tolerance is the same as carbon steel tube .
If the pipe is line pipe and need 3 PE coating . then the seller quote for price based one the weight of the pipe which is not including the weight of PE coating . for example if the buyer wan to buy 300 meters pipe ,the OD is 1000MM ,the wall thickness is 9MM ,then according to the formula the weight should be 65.98ton ,the price for PE is according to the acreage of the surface of the tube ,suppose the tube is 1000 square meters surface ,the cost for PE is 3000USD, i.e 3 USD/square meter , then the price for PE coating can be regarded as 3000/65.98=45.68USD/ton , add this price to the price of tube ,then we can get the price for 3PE coating steel tube based on pipe weight not including the weight of PE , that means the price is based on bare pipe , the real weight of the goods is larger than 65.98tons .
For precision steel tube like hydraulic cylinder ,honed pipe , due to the machine cost is very high , so the price is based on theoretic weight of the pipe or based on meters , the producer will not weight the real weight of the tube . the weight is just used to calculate the value of the goods .
If the goods is not steel tube ,it just a steel billet or steel rod ,then you can suppose the wall thickness is the same as radius . then r-D/2 , then you can get the another formula as: D^2 *0.0006165*L.
If the pipe is rectangle tube or square tube , you can suppose it was made from round tube , the D can be replaced as ,(border length 1+border length 2)*2/3.14=D, then you can convert the problem into round tube .
Above information is for friends in tube industry to calculate the weight of the tube and also for pipe supply
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