Characteristics, chemical composition and corrosion resistance of 0Cr18Ni9Ti stainless steel wire mesh

Characteristics, chemical composition and corrosion resistance of 0Cr18Ni9Ti stainless steel wire mesh

0Cr18Ni9Ti stainless steel wire mesh includes 0Cr18Ni9Ti stainless steel mesh, 0Cr18Ni9Ti stainless steel dense mesh, 0Cr18Ni9Ti stainless steel screen, 0Cr18Ni9Ti stainless steel filter mesh, 0Cr18Ni9Ti metal wire mesh, 0Cr18Ni9Ti stainless steel square hole mesh and other metal wire woven meshes.

0Cr18Ni9Ti (the old 321 corresponding stainless steel) contains titanium that resists intergranular corrosion, has good intergranular corrosion resistance and cold working stamping performance, has strong corrosion resistance to oxidizing acids (such as nitric acid), and also has certain corrosion resistance to alkaline solutions and most organic and inorganic acids.

The processes can be divided into: weaving, welding, stretching, punching and other methods; among them, weaving can be divided into plain weave, twill weave, plain Dutch weave, twill Dutch weave, reverse Dutch weave and other processes.

0Cr18Ni9Ti stainless steel wire mesh chemical composition: C: ≦0.07 Si: ≦1.00 Mn: ≦2.00 P: ≦0.035 S: ≦0.030 Ni: 8.00-11.00 Cr: 17.00-19.00 Ti: 5C%-0.70

0Cr18Ni9Ti is a representative product of backward stainless steel production technology, and has been used to replace 321. In the early years, 0Cr18Ni9Ti was the stainless steel grade with the largest amount and the widest range, and its output accounted for more than 30% of the stainless steel output. It was used to manufacture deep-drawn parts, acid pipelines, storage tanks and acid storage containers, etc. It can also be used as the main material of chromium-nickel stainless steel and chromium stainless steel welding rods, non-magnetic parts and parts in low-temperature environments, acid pipelines, containers, etc. At present, the amount of use in some areas is still very large.

With the improvement of stainless steel production technology in my country and other countries in the world, it has become an obsolete product. Due to my country's national conditions, it is still retained to meet the needs of backward usage habits and production levels, and is not a recommended steel type. According to the national standard GB/T20878-2007, when 0Cr18Ni9Ti is really needed, 0Cr18Ni10Ti (0Cr18Ni9Ti) should also be used.

0Cr18Ni9Ti stainless steel wire mesh corrosion resistance

The corrosion data of 0Cr18Ni9TI steel in nitric acid, sulfuric acid, phosphoric acid and acetic acid are shown in Tables 10-10, 10-11 and 10-12 respectively. This steel is suitable for low-temperature acetic acid, especially dilute acetic acid. In situations where acetic acid is more common, austenitic stainless steel containing molybdenum or molybdenum and copper should be selected.

Pure acetic acid is less corrosive and generally does not cause local corrosion. However, in actual production, storage, transportation and use, the presence of impurities such as CI- and formic acid can cause accelerated corrosion and is very sensitive to pitting corrosion. As the temperature and concentration of acetic acid increase, corrosion will increase. This shows that when using corrosion data obtained from the laboratory, it is necessary to combine it with the actual use of the medium.