The features of ASTM A179 cold-drawn seamless steel tube

Cold-drawn seamless steel tube has excellent characteristics in the supply of drinking water, which makes people's drinking water safety well guaranteed. We all know that stainless steel is a very stable material. It has strong corrosion resistance. The use of this material avoids a series of water quality problems caused by water corrosion and enhances the quality of our daily drinking water. , to protect everyone's health.

The application advantages of cold-drawn seamless steel tube have been recognized by many people, especially foreign research institutions. After engineering research and experiments, it has been proved that cold-drawn seamless steel tube is a comprehensive, new type of steel tube in the water supply system. One of the energy-saving and environmentally friendly pipes. He is also a very competitive pipe, and it can not be replaced by anything in helping people's daily water supply.

Corrosion condition of cold-drawn seamless steel tube

Although the cold-drawn seamless steel tube has stronger torsion resistance and better corrosion resistance than ordinary steel tubes, there are still some environments that will cause corrosion to the cold-drawn seamless steel tube. The following environments should be avoided as much as possible to avoid causing The cold-drawn seamless steel tube is corroded.

Under what circumstances will the cold-drawn seamless steel tube be corroded?

1. Acidic water

The acidity of acid water is much stronger than that of ordinary water quality, and the iron sulfate contained in this kind of water has a great influence on the corrosion of stainless steel.

2. Saline water

To a certain extent, saline water will cause damage to the external passive film of the cold-drawn seamless steel tube, and then cause the corrosion of the cold-drawn seamless steel tube.

3. Sour acid

Pin acid mainly affects the intergranular structure inside the cold-drawn seamless steel tube. Higher temperature and higher concentration of pin acid are very serious for the erosion of cold-drawn seamless steel tubes.

4. Atmospheric erosion

The corrosion of the cold-drawn seamless steel tube by atmospheric erosion is reflected in the erosion of the cold-drawn seamless steel tube by the chloride and pollutant pollution sources, and this corrosion is very serious.

The effect of cold-drawn seamless steel tube surface treatment on its performance

1. Surface quenching is a heat treatment that changes the surface structure without changing the chemical composition of the surface.

It can be realized by high frequency, medium frequency or power frequency electric induction heating or flame heating. Its common feature is that the surface of the cold-drawn seamless steel tube is quickly heated to the quenching temperature, and when the heat is not transmitted to the core of the part, it is rapidly cooled, so that the surface hardness is high, while the core still has high toughness.

2. Chemical treatment—a heat treatment method in which the chemical composition and structure of the surface layer of the cold-drawn seamless steel tube are changed.

Chemical heat treatment can be divided into carburizing, nitriding, carbonitriding, metallizing and other methods according to the different elements infiltrated on the surface of cold-drawn seamless steel tube. It is very effective to improve and improve the wear resistance, corrosion resistance and fatigue resistance of cold-drawn seamless steel tube. At present, chemical heat treatment has developed rapidly, and there are many applications of new technologies.