Processing method of hot-dip galvanized seamless pipe

When a layer of zinc is applied on the surface of the steel pipe, it can be called a galvanized sheet; the galvanizing on the surface of the steel sheet is to allow the product to better prevent corruption. In fact, galvanized sheet has different treatment methods in the coating process, and the state presented on the surface, such as ordinary spangle, flat spangle, fine spangle and no spangle. Due to the variety of seamless pipes sizes, they are widely used and also appear in small auto parts.

What are the treatment methods of hot-dip galvanized seamless steel pipe?

1. Passivation: the galvanized sheet is passivated to reduce rust in the humid environment of storage and transportation. The technical performance of this chemical analysis treatment is relatively limited and will hinder the adhesion of most coatings. This method is not usually used for zinc-iron alloy coatings, except for conventional surface treatments, other types of zinc passivation layers.

2. Oiling: In fact, the corrosion of hot-dip galvanized sheet can be reduced by oiling. Under the condition of wet storage and transportation technology, when the passivated hot-dip galvanized sheet and steel strip are oiled It will further reduce the rust caused by its wet storage; at the same time, the oil layer can be removed with a degreasing agent that does not damage the zinc layer.

3. Sealing paint: provides additional protection against corrosion, especially fingerprint resistance, by applying a relatively thin layer of transparent organic coating film. Lubricity can be changed during molding and as a follow-up study for companies to study the adhesion of the coating as well as the bottom layer.

4. Phosphate ester: Phosphoric acid treatment is performed on various types of seamless steel pipes, so that there is no need for further coating treatment except for normal cleaning. This treatment can change the adhesion properties and anti-corrosion technical properties of traditional coatings, thereby reducing the risk of corrosion during storage and transportation. After phosphating and suitable lubricants, the forming properties can be changed.

The black steel seamless pipe has a hollow section and is widely used as a pipeline for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, the steel pipe is lighter in weight when the bending and torsional strength is the same, and is an economical section steel.

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