Chemical properties of steel pipes

The chemical properties of steel pipes refer to the ability of a steel pipe to resist chemical attack by various corrosive media at room temperature or high temperature, mainly in terms of corrosion and oxidation resistance.

Name	Meaning
Chemical properties	The chemical properties of steel pipes refer to the ability of a steel pipe to resist chemical attack by various corrosive media at room temperature or high temperature, mainly in terms of corrosion and oxidation resistance.
Chemical corrosion	Chemical corrosion is the result of the direct chemical interaction between the steel pipe and the surrounding medium. It includes two forms of gas corrosion and corrosion of steel pipe in non-electrolyte. Its characteristics are: no current is generated during the corrosion process; and corrosion products are deposited on the surface of the steel pipe.
Electrochemical corrosion	Corrosion caused by the action of steel pipes in contact with electrolyte solutions such as acids, alkalis and salts is called electrochemical corrosion. It is characterized by the current generated during the corrosion process. The corrosion products (rust) are not covered on the surface of the steel pipe as the anode, but at a fixed distance from the anode steel pipe
General corrosion	This kind of corrosion is evenly distributed on the inner and outer surfaces of the entire steel pipe, so that the cross section is continuously reduced, and finally the stressed parts are destroyed
Intergranular corrosion	This corrosion takes place inside the steel pipe along the edge of the grain, usually does not cause any change in the shape of the steel pipe, often causing sudden damage to the equipment or parts
Pitting	This corrosion is concentrated in the area where the surface of the steel pipe is not large, and quickly develops deeper, and finally penetrates the steel pipe, which is a kind of corrosion damage that is more harmful
Stress corrosion	Stress corrosion refers to the damage caused by the steel pipe in the corrosive medium under the action of static stress (internal and external stress of the steel pipe). This kind of corrosion usually passes through the grain, so-called transgranular corrosion
Corrosion fatigue	Corrosion fatigue refers to the damage caused by steel pipes in corrosive media under the action of alternating stress. It is also a kind of transgranular corrosion
Antioxidant	The ability of the steel pipe to resist oxidation at room temperature or high temperature. The oxidation process of the steel pipe is actually a form of chemical corrosion. It can be used directly for a certain period of time. The quality loss of the steel pipe surface after corrosion is reduced by the steel pipe. Heavy speed indication.