What are the characteristics of galvanized channel steel?

From: JUNNAN STEEL NEWS
publisher: Gloria Wong
Time: 2020-03-13
Summary: What are the characteristics of galvanized channel steel?

If we want to get a good understanding of galvanized channel steel, we must start with its corrosion resistance, high temperature oxidation resistance, physical properties and other aspects to understand more systematically. Let ’s take a look together.

Corrosion resistance: Galvanized channel steel has the ability to withstand general corrosion similar to the unstable Ni-Cr alloy 304. Prolonged heating in the chromium carbide temperature range may affect alloys 321 and 347 in harsh corrosive media. Mainly used in high temperature applications. High temperature applications require strong anti-sensitization of the material to prevent intergranular corrosion at lower temperatures.

High temperature oxidation resistance of galvanized channel steel: Galvanized channel steel has high temperature oxidation resistance, but the oxidation rate will be affected by inherent factors such as the exposed environment and product form.

 Physical properties of galvanized channel steel: The total heat transfer coefficient of the metal depends on other factors besides the thermal conductivity of the metal. In most cases, the heat dissipation coefficient of the film, the scale and the surface condition of the metal. Stainless steel keeps the surface tidy, so its heat transfer is better than other metals with higher thermal conductivity.

Galvanized channel steel is heated to 850 to 1250 ° C, and then heat-treated at a cooling rate of 1 ° C / s or higher. In this way, it can become a high-strength galvanized channel steel with a martensitic structure with a volume fraction of 12% or more, high strength of 730 MPa or more, corrosion resistance and bending workability, and toughness in the welding heat affected zone. Reusing Mo, B, etc. can significantly improve the stamping performance of welded parts.

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