Q195BQ235BQ345B Hot-dip Galvanized Round square Pipe National Standard Threaded Pipe 20 45 Galvanized Seamless Steel Pipe

According to the material of the steel pipe
Steel pipes can be divided into carbon pipes, alloy pipes, stainless steel pipes, etc. according to the material of pipe making (i.e. steel type). Carbon pipes can be divided into ordinary carbon steel pipes and high-quality carbon structural pipes. Alloy pipes can be divided into: low-alloy pipes, alloy structural pipes, high-alloy pipes, and high-strength pipes. Bearing tubes, heat-resistant and acid-resistant stainless tubes, precision alloy (such as Kovar) tubes and high-temperature alloy tubes.3
Specifications and dimensions of steel pipes
Divide 1 inch into 8 equal parts, there are 1/8, 1/4, 3/8, 1/2, 5/8, 3/4, 7/8 inches.
It is equivalent to the usual 1 to 7 points, and smaller sizes are expressed in 1/16, 1/32, and 1/64, and the unit is still inches. If the denominator and the numerator can be reduced (e.g., the numerator is 2, 4, 8, 16, 32), it should be reduced.
The indication of inches is to put two skims in the upper right corner, such as 1/2", such as DN25 (25mm, the same below) water pipe is the imperial 1" water pipe, and it is also the 8 water pipe before liberation. The DN15 water pipe is an inch 1/2" water pipe, and it is also a 4-point water pipe before liberation. For example, the water pipe of DN20 is the water pipe of the imperial 3/4", and it is also the 6-point water pipe before liberation. 1. Size: DN15 (4 pipes), DN20 (6 pipes), DN25 (1 inch tube), DN32 (1 inch 2 tubes), DN40 (1 inch half tube), DN50 (2 inch tubes), DN65 (2 inch half tubes), DN80 (3 inch tubes), DN100 (4 inch tubes), DN125 (5 inch tubes), DN150 (6 inch tubes), DN200 (8 inch tubes), DN250 (10 inch tubes)