Differences Between Galvanized Steel Pipe and Stainless Steel Pipe

Galvanized pipe and stainless steel pipe are commonly used pipes. Galvanized pipes are coated with zinc to achieve corrosion resistance. Stainless steel pipe is added with antioxidant metal elements to greatly resist corrosion. Different steels will work better depending on the application they are used in. There are many factors to consider when selecting galvanized steel pipes or stainless steel pipes. At the same time, we need to understand the basic knowledge of galvanized steel pipes and stainless steel pipes. Stainless steel pipes and galvanized steel pipes are often mixed.

What is Galvanized Pipe?

Galvanized welded pipe can be divided into hot-dip galvanizing and cold-dip galvanizing. Hot-dipped galvanized tubes are alloy layers formed by the reaction of molten metal with iron matrix, thus combining the matrix and the coating. Hot-dip galvanizing is the process of pickling steel pipes. In order to remove iron oxide from the surface of steel pipes, after pickling, the pipes are cleaned in an ammonium chloride or zinc chloride aqueous solution tank or a mixture of ammonium chloride and zinc chloride aqueous solution tank, and then sent to the hot-dip galvanizing tank. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.

What is Stainless Steel Pipe?

Stainless steel pipe is a hollow, long, cylindrical steel. It is an alloy steel and is classified into many grades according to the metal elements of the alloy. Stainless steel pipe is a steel pipe which is resistant to weak corrosive media such as air, steam and water and chemical corrosive media such as acid, alkali and salt.

Differences Between Galvanized Steel Pipe and Stainless Steel Pipe

Different Manufacturing Processes

Galvanized pipe is coated with zinc on the basis of carbon steel pipe, and hot-dip galvanizing process is generally used. Stainless steel pipes are made from alloy steel embryos by various processes.

Different Welding Conditions

Welding of stainless steel pipes can reduce the passivation layer and produce brittleness. Galvanized steel pipe welding can generate zinc oxide smoke, which can be hazardous if inhaled by the human body, and welding can damage the zinc coating. Generally, welding is performed before galvanizing or zinc coating is added after welding.

Different Corrosion Resistance

Galvanized steel pipes can be well waterproof and chlorine resistant, but they are poor in marine environments. The surface damage of the galvanized layer will affect the corrosion resistance of the entire steel pipe. If the stainless steel pipe is scratched, the corrosion resistance of other areas is still intact

Different Mechanical Properties

The performance of galvanized steel pipes depends on the performance of carbon steel. The performance of stainless steel pipes depends on the content of metal elements. The ductility and hardness of galvanized steel of the same thickness are higher than those of stainless steel.

Different Prices

Stainless steel pipes of the same specification are far more expensive than galvanized steel pipes.

Different Appearance

Galvanized pipes have a dull color and a slightly rough surface. Stainless steel pipes have a shiny color and a smooth surface.

Different Weights

Galvanized pipes of the same specification are heavier than stainless steel pipes, and the galvanized layer is generally 6% of the weight of carbon steel pipes

Different Application Fields

Galvanized pipes：

• Agricultural appliances

• Automotive manufacturing

• Construction tools

• Catering facilities

• Heating pipe

• Manufacturing equipment

• Power generation equipment

• Telecommunication infrastructure

  
  

Stainless steel pipes can be used for all of the above purposes regardless of cost, but also for more of the following scenarios.

• Food processing equipment

• Pharmaceutical manufacturing equipment

• Spacecraft engine vomponents

• Kitchenware

• Offshore oil and gas engineering

We(Shanghai Zhucheng Pipe Fittings Manufacturing Co Ltd) is professional engaged in manufacture of steel pipe, pipe fittings( butt welding, socket weld, threaded) and flanges in pipe system of all kinds of materials(carbon steel, stainless steel, alloy steel).  In order to get to a successful cooperation with customers, normally we are willing to provide free samples to all customers if required. (The customer should be responsible for the freight and the samples should be in common size and materials)