What is the difference between galvanized steel pipe and stainless steel pipe?

1. The theory is different. Galvanized seamless steel pipe is a welded pipe with a hot-dip or electroplated zinc layer on the surface. Stainless steel pipe is a hollow strip-shaped ring-shaped construction steel material. 2. The prices are different. The price of galvanized steel pipes is more cost-effective than that of stainless steel pipes. The fundamental reason is that the two materials are different, the processing procedures are also different, and the effects they present are also different.

3. Differences in application fields. Hot-dip galvanized steel is widely used in engineering construction, machinery and equipment, coal mining, chemical plants, power engineering, and other machine manufacturing industries. Stainless steel pipes are mainly used in transportation pipes and mechanical structural parts in industries such as crude oil, chemical industry, medical treatment, food, light industry, and mechanical instrumentation. It is also used in furniture and kitchen supplies.

How to judge the quality of hot-dip galvanized pipes

1. Appearance of galvanized pipes

The surface of high-quality galvanized pipes should be well-coated and evenly connected, with no sagging, dripping or excessive clumps on the surface. There should be no sand holes, exposed iron or defects on the surface of the pipe.

2. Thickness of galvanized layer

The thickness of the zinc layer of galvanized pipes is an important factor in distinguishing the quality of galvanizing. Generally expressed based on m, it can also be described by the net weight of galvanized layer per square meter (g/m2). Because zinc and steel have different types of magnetization and polarizability, zinc coating thickness can be determined with high quality using a galvanized coating thickness gauge. To measure the weight of the zinc layer, it is necessary to scrape off the zinc layer and measure it with physical methods such as the sodium antimony cyanate method.

3. Uniformity of galvanized layer

The high-quality galvanized layer has a smooth surface and no leakage or damage after the electroplating process. Galvanized pipes can be soaked in a certain concentration of silver nitrate solution for a certain number of times and for a certain time. If there is no red leaching on the surface, it can be called galvanized. The pipe has no defects such as sand holes and damage after plating.

From the above differences, we can know the differences between the two, and then we can understand which one is suitable.