How many kilograms is the national standard meter of steel bar with a diameter of 20 cm?

How many kilograms is the national standard meter of steel bar with a diameter of 20 cm?

Φ 20 = 2.47kg, the theoretical weight of the steel bar with diameter d = D ^ 2 / 100 * 0.617 = D ^ 2x0.00617 ^ 2 is the square, 0.617 is the theoretical weight of the steel bar with diameter 10, just remember the theoretical weight of the steel bar with diameter 12 and below, keep three decimal places; keep two decimal places for the steel bar with diameter 12 and above; keep 6 to 7