subject: Corrosion Of Stainless Steel Really Be It? [print this page] Although stainless steel pipe itself as "will not rust," but encountered the following when several or to alert the media.
1. Acidic water
Acidic water is leaching from the ore and coal are not the natural purification of water, because it is a strong acid so its corrosive than fresh water from the natural strength have little to lose. As the water contained in sulfide ores and coal's role in leaching of acid water usually contain a large number of shopping together sulfuric acid. He during which the water contains a small amount of ferric sulfate, the corrosion of carbon steel with a very large role.
Mongolia acidic water to do with the carbon steel equipment is usually very quick to be corrupt. The role of acidic water with Mongolia by the experimental results of various data indicate that Beijing satellite antenna installation, is the kind of environment austenitic stainless steel capillary pipe corrosion under no more function.
Austenitic stainless steel pipe in concentrated river water and acid corrosion in excellent function, special non-corrosion film on the barriers to greater heat conduction. Therefore, the usefulness of communication commonly used in cold stainless steel capillary pipe.
2. Saline water
Salt water corrosion resistance characteristics of surface erosion is often the situation presented. On the stainless steel pipe to a large level of water because of salt corrosion resistance incurred only fast part of the damaged membrane. The corrosion of steel produced Punctuality other reason is the destruction in the stainless steel tubes attached to myoga prepared on fresh inorganic medium and the rest of the light oxygen may constitute good battery. Shaped failure overnight, these batteries are very lively, and the formation of a large number of corrosion and surface erosion. Salinity water in the case of high-speed fixed, such as sewage pump impeller, austenitic stainless steel capillary pipe length of pipe corrosion is usually always great.
On the application of stainless steel pipe plate of cold coagulation device, to insist on the water drips faster than 1.5m / s, so that fresh water minerals and other solids in the tube at least outside the convergence failure. For the disposal of salt of the fire equipment is not rust steel structure, is designed with the best non-narrow gap war use of thin-walled parts.
3. Soil
Buried soil in the metal, and depends on the weather and other factors, changes in time are in the great, complex situations. Theory confirmed the existence of ordinary austenitic stainless steel pipe excellent corrosion resistant properties of the soil a large minority, but in the good 1Cr13 and 1Cr17 Yang Xiao and more punctual in the loss to happen. 0 Cr 17Ni12M2 Xiao Yang stainless steel capillary pipe in all the experiments can complete resistance to pitting.
4. Nitric acid
Not less than 14% chromium iron dirty body austenitic stainless steel pipe and pipes have excellent resistance to nitric acid corrosion. 1Cr17 stainless steel nitric acid plant is not commonly used by industrial equipment. However, because 0 Cr 18 Ni 9 is usually good as there is cross-shaped performance and welding performance, fruit He is not in the use of a large number of replaced 1Cr17 stainless steel tube.
Other austenitic stainless steel capillary pipe corrosion resistance of nitric acid to take 0 Cr 18 Ni 9 phase far. 1Cr17 stainless steel pipe is usually higher than 0 Cr 18 Ni 9 of the corrosion rate slightly faster and a higher degree of temperature and light sound of their greater impact.
If only the cold steel into the deal does not apply the warm iron nitrate will fight dirty body austenitic stainless steel intergranular corrosion occurred. Thus, the available appropriate warm disposition to prevent the type of corrosion species, perhaps using the kind of species-type corrosion-resistant stainless steel pipe.
5. Sulfuric acid
A long stainless steel tube grade scale for sulfuric acid, can be used because of its very narrow scope. At room temperature under the premise, 0Cr17Ni12Mo2 stainless steel (the most standard grades of sulfuric acid corrosion resistance) in the sulfuric acid concentration of less than 15%, or greater than 85% are resistant nature. However, the higher the concentration of the scale, usually carbon filter. Martensitic and ferritic stainless steel capillary pipe body generally impatient sulfuric acid corrosion.
As in the case as if the nitric acid, if appropriate for the stainless steel pipe would not join just warming treatment, the formation of sulfuric acid has intergranular corruption. Welding can not pay on the first disposal into the only cold welding pay structure, when the application of low carbon grades 00Cr19Ni10, or 00Cr17Ni14Mo2,, or the trademark sound of 0Cr18Ni11Ti or 0Cr18Ni11Nb stainless steel tube.
