Hot Dip Galvanized Steel Pipe Tube 4-Inch Made China Bending Processing Service Competitive Price Galvanized Pipe Making Machine

Cold galvanized pipe is electro-galvanized, the amount of galvanization is very small, only 10-50g/m2, and its corrosion resistance is much different from that of hot-dip galvanized pipe. In order to ensure the quality, most of the regular galvanized pipe manufacturers do not use electrogalvanizing (cold plating). Only those small enterprises with small scale and outdated equipment use electrogalvanizing, and of course their prices are relatively cheaper. The Ministry of Construction has officially eliminated the cold galvanized pipes with backward technology, and is not allowed to use cold galvanized pipes for water and gas pipes. The galvanized layer of cold galvanized steel pipe is an electroplating layer, and the zinc layer is independently layered with the steel pipe matrix. The zinc layer is thin, and the zinc layer is simply attached to the steel pipe matrix and is easy to fall off. Therefore, its corrosion resistance is poor. In newly built homes, it is forbidden to use cold galvanized steel pipes as water supply pipes.

Weight factor

Nominal wall thickness (mm): 2.0, 2.5, 2.8, 3.2, 3.5, 3.8, 4.0, 4.5.

Coefficient parameters (c): 1.064, 1.051, 1.045, 1.040, 1.036, 1.034, 1.032, 1.028.

Note: The mechanical properties of steel are an important index to ensure the final use performance (mechanical properties) of steel, which depends on the chemical composition of the steel and the heat treatment regime. In the steel pipe standard, according to different use requirements, the tensile properties (tensile strength, yield strength or yield point, elongation) and hardness, toughness indexes, as well as the high and low temperature properties required by users are specified.

Steel grade: Q215A; Q215B； Q235A； Q235B。

Test pressure value/Mpa: D10.2-168.3mm is 3Mpa, D177.8-323.9mm is 5Mpa