Steel pipe price calculation method

Is the price of steel pipe in meters or weight ? How to calculate it ?
Generally priced in tons ( t )! Because in the calculation of the amount of steel is converted into tons to measure!
The price difference between different specifications is still relatively large.
And related to the steel pipe market, such as a very high price of steel at the end of the year, when the price of steel can reach 8-9 thousand
The price has dropped very low now.
In addition, the prices in different places are not the same. Generally, the prices of these materials can be found on some steel pipes, and they must be charged!
The price of steel pipes in Shanghai is now between 4,500 and 5,800 (different specifications )!
There is still a rising trend!

Steel pipe conversion weight formula: m = F × L × p / 1000
Description:
m : weight ( kg ) F : sectional area ( mm2 ) L : length ( m ) p : density ( g / cm 3 )