What is the typical thickness of the zinc coating for cold-rolled galvanized Q345 steel?

What is the typical thickness of the zinc coating for cold-rolled galvanized Q345 steel?
The zinc coating thickness for cold-rolled galvanized Q345 steel varies depending on the galvanizing process, as follows:
Cold-dip galvanizing: Cold-dip galvanizing involves electrochemically depositing a zinc layer. Its thickness is generally 5-15μm. It is low-cost but has poor durability, and is primarily used in dry indoor environments.
Hot-dip galvanizing: The thickness requirements for hot-dip galvanizing vary depending on relevant standards and actual application. For example, GB/T 13912-2020, "Technical Requirements for Hot-Dip Galvanizing," does not specify a specific thickness. However, in practice, for Q345 steel, the thickness of the hot-dip galvanized layer is typically ≥86μm (salt spray test ≥1000h) in corrosive environments. Furthermore, for continuously hot-dip galvanized steel strip that complies with GB/T 2518, the single-sided zinc coating thickness must be no less than 19μm. For hot-dip galvanizing that complies with GB/T 13912, the zinc coating thickness must be no less than 45μm. There are also some corporate standards, such as Q345 cold-rolled galvanized C-shaped steel, whose zinc layer weight is usually 120-275g/㎡, and the corresponding zinc layer thickness is about 17-39μm.