Technical requirements for hot-dip galvanizing
During hot-dip galvanizing, the chemical activity of the steel changes under the influence of the amount of silicon and phosphorus contained in it. The composition of the steel does not matter in gas-thermal coating or diffuse galvanizing. Types of steel suitable for galvanizing are divided into: carbon steel (iron+carbon), this steel grade reaches 90% of the total production; high-strength low-alloy steel-grade, has in its composition about 2% of various additives that enhance the strength of products with a small increase in the cost; low-alloy steel, alloyed with molybdenum, manganese, chromium, nickel (in total up to 10%) for effective heating of thick-walled products. Steel grades can be hot-rolled and cold-rolled. In the production of corners, flat and I-sections, as well as other metal profiles, hot-dip galvanized steel is used. Structures such as fences, clad rails and panels are examples of cold-rolled production. The specifics of the methods of diffuse coating and thermal spraying do not depend on the characteristics of the steel. For hot-dip galvanizing cast irons are optimally suited.
The use of galvanizing is the best way to slow down and prevent rust on ferrous metal products, it protects cast iron and steel barrier and galvanic action.