Stainless steel valve rust causes and solutions Stainless steel valve and carbon steel valve difference

Stainless steel valve rust causes and solutions Stainless steel valve and carbon steel valve difference

One, stainless steel valve rust reasons
Research whether the stainless steel valve can rust, you can first place the same valve in a different environment to verify the comparison, generally speaking, if the stainless steel valve is placed in a relatively dry environment, after a long time, the valve is not only good as new, but also no rust, but if the valve is placed in the seawater containing a lot of salt, not a few days will rust, It can be seen that the corrosion resistance and rust resistance of stainless steel valves also need to be limited by the use of environment. In addition, from the characteristics of the stainless steel valve itself, it is not rust because there is a layer of chromium-rich oxide film on the surface to prevent the external oxygen atoms and other particles caused by the invasion of damage to the object, so that it has the characteristics of rust, but when the film is damaged by environmental factors, as oxygen atoms into the free iron ions, stainless steel valve will produce rust.
There are many reasons for the destruction of stainless steel valve surface film, resulting in rust, some film and other metal element particles or dust electrochemical reaction, at the same time with the moist air as a medium, the formation of a micro battery cycle, making stainless steel surface rust, can also be stainless steel surface film directly in contact with acid, alkali and other corrosive liquids, caused by corrosion, etc. Therefore, in order to stainless steel valve rust, in daily use should also pay attention to the cleaning of objects, keep the valve surface clean.
Two, stainless steel valve rust solution
So how do you make sure the surface of the metal is always bright and not corroded? Sanjing Valve Manufacturing Co., LTD. Professional and technical personnel suggestions:
1. It is necessary to clean and scrub the decorative stainless steel surface frequently, remove attachments and eliminate external factors that cause modification.
2. The seaside area should use 316 stainless steel, 316 material can resist seawater corrosion.
3. The chemical composition of some stainless steel tubes on the market can not meet the corresponding national standards, up to 304 material requirements. Therefore, it will also cause rust, which requires the user to carefully choose the product construction of reputable manufacturers and construction points of attention in order to prevent the construction of scratches and pollutants attached, stainless steel construction under the state of film. But with the extension of time, the residual paste liquid in accordance with the service life of the film, after the construction of the film should be removed when the surface washing, and the use of stainless steel tools, and general steel cleaning public tools, in order not to let the iron chips stick should be cleaned. Attention should be paid to prevent the highly corrosive magnetic and stone luxury cleaning drugs from coming into contact with the stainless steel surface, if contact should be immediately washed. After the construction, neutral detergent and water should be used to wash the cement, powder and ash attached to the surface.
Stainless steel valve and carbon steel valve the difference between stainless steel valve and carbon steel valve material elements: The general materials of stainless steel valves are CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), 321, 1CR18NI9TI, 0CR18NI9, 310S, 2250 and 201 and other ordinary non-standard stainless steel materials. CF8, CF3, CF8M, CF3M and other letter materials casting code, 304,316 and other digital forms marked as forging code form.
Stainless steel valve and carbon steel valve difference
Different material elements:
The general materials of stainless steel valves are CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), 321, 1CR18NI9TI, 0CR18NI9, 310S, 2250 and 201 and other ordinary non-standard stainless steel materials. CF8, CF3, CF8M, CF3M and other letter materials casting code, 304,316 and other digital forms marked as forging code form. And CF8 (304) general American standard code, and the corresponding domestic code is 0CR18NI9. And the domestic equivalent of 321 is 1CR18NI9TI. 304 generally has C�Ü0.08, Mn¡Ü2.00, P¡Ü0.045, S¡Ü0.030, Si¡Ü1.00, CR18.0-20.0, Ni:8.0-11.0.316 material structure elements are: C: 0.03 ~ 0.08, Si: ¡Ü1.0, Mn: ¡Ü2.0, Cr: 16.18.0, S: ¡Ü0.03,P: ¡Ü0.045, Mo¡Ü2.0-3.0, corresponding to the national standard 0Cr17Ni12Mo2. 321 stainless steel has the following chemical elements: carbon C: ¡Ü0.08; Si: ¡Ü1.00, manganese Mn: ¡Ü2.00, sulfur S: ¡Ü0.030, P: ¡Ü0.035, Cr: 17.00 ~ 19.00, Ni: 9.00 ~ 12.00, Ti: ¡Ý5¡ÁC%. And 316L is based on 316 nickel composition addition, has higher corrosion resistance. The corresponding brand of 310S is 2520 (0CR25NI20)). We often call it two-phase steel, which is a stainless steel material with ultra-high temperature resistance and corrosion resistance, and its price is very expensive. Chemical composition: C :¡Ü0.08, Si :¡Ü1.00, Mn :¡Ü2.00, P :¡Ü0.035, S :¡Ü0.030, Ni :¡Ü19.00-22.00, Cr :¡Ü24.00-26.00. Stainless steel valve and stainless steel material use ***, generally used in chemical plants, food factories, water plants, etc., has good corrosion resistance, pressure resistance, high temperature resistance, wear resistance, cleanliness and other characteristics, is an indispensable industrial and civil valves and materials.
Carbon steel general materials are carbon steel WCB cast steel, A105 forged steel, 20# steel, LCB low temperature steel and so on. Generally, WCB carbon steel is commonly used. WCB cast steel valves play a great role in daily life or industrial pipes, and the dosage is high. A105 is made of forged steel, which has good tensile properties, high density, high pressure and high temperature resistance, and is suitable for small pipes. 20# steel is generally used for accessories, generally for rod material, generally for bolts, nuts and so on. LCB is low temperature carbon steel, used in low temperature conditions, such as cold storage pipes and so on. The chemical composition of WCB material is: C¡Ü 0.3Mn ¡Ü 1.0Si ¡Ü 0.6P ¡Ü 0.05S ¡Ü 0.06Ni: 0.5Cr: 0.4Mo :0.25; A105 forging steel material and casting material will have certain differences: C:¡Ü 0.35Si :¡Ü 0.35Mn: 0.6-1.05S :¡Ü 0.050P :¡Ü0.040; LCB low temperature carbon steel ¡Ü0.30 ¡Ü0.60 ¡Ü1.0 steel LC3(-101¡æ)¡Ü0.15 3.0 ~ 4.0.
Stainless steel valve and carbon steel valve features and application fields:
Stainless steel valves are good to use in corrosive pipes and steam pipes. They have corrosion resistance, high temperature resistance and high pressure resistance. They are generally used in corrosive pipes of chemical plants, and pipes of tap water or food factories. The carbon steel valve has no corrosion resistance, can only be used for steam, oil, water and other corrosive medium pipe, and the cost of carbon steel valve is much lower than the cost of stainless steel, so generally no corrosive steam and other pipes are used carbon steel, and corrosive stainless steel valves and other materials.