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The corrosion resistance of stainless steel wire mesh

2015-12-31 15:48:07 Hot:

1. The type and the definition of corrosion

In many industrial applications, stainless steel can provide satisfactory corrosion resistance of modern people. With experience point of view, in addition to mechanical failure, the corrosion of stainless steel wire mesh mainly in: a serious corrosion of stainless steel wire mesh in the form of localized corrosion (ie, stress corrosion cracking, pitting, intergranular corrosion, crevice corrosion and corrosion fatigue) . Examples of these localized corrosion failure caused almost more than half of cases of failure. In fact, many fail accident can be a reasonable selection and be avoided.

Stress corrosion cracking (SCC): A generic term refers to an alloy to withstand stress in a corrosive environment due to the strong pattern of expansion and alternate failure. Stress corrosion cracking brittle fracture surface, but it may also occur in high toughness materials. A necessary condition for the occurrence of stress corrosion cracking is to have a tensile stress (whether residual stress or applied stress, or both) and the presence of a specific corrosive media. Type pattern formation and expansion direction substantially perpendicular to the tensile stress. This leads to stress the value of stress corrosion cracking than the material does not require stress fracture much smaller presence of corrosive media. Materials on a microscopic section through the grain called transgranular crack cracks along the grain boundaries of Extended called intergranular crack crack, stress corrosion cracking when extended to one depth (here, bear the load The stress reaches its breaking stress in the air), the material on the normal cracks (in ductile materials, usually through microscopic defects polymerization) and disconnect. Therefore, due to stress corrosion cracking and failure of parts of the section, will include stress corrosion cracking characteristics of the region as well as micro-defects have been linked polymeric "dimple" area.

Pitting corrosion: is a form of corrosion leading to localized corrosion.

Intergranular corrosion: the grain boundaries between the crystal orientation is different from the grain boundary disorder malocclusion city, therefore, they are the steel in various solute segregation or metal compounds (such as carbides and δ phase) precipitated favorable District City. Thus, in certain corrosive media, grain boundaries may be corroded in advance but not surprising. This type of corrosion is known as intergranular corrosion, most metals and alloys may be present in a specific corrosive medium intergranular corrosion.

Inside is a form of localized corrosion, which could send the whole solution, stagnation in the cracks or shielded surface: crevice corrosion. Such slits may be a metal with a metal or metal and non-metal junction is formed, for example, with rivets, bolts, gaskets, valve seats, loose surface deposits and sea creatures phase candle is formed.

General corrosion: is the term used to describe the entire surface of the alloy spoon all the way to compare what happened corrosion phenomena. When general corrosion occurs when materials village gradually thinning due to corrosion, even material corrosion failure. Stainless steel in acid and alkali may render comprehensive corrosion. Failures caused by general corrosion is not how worrying because such corrosion can usually be by simple immersion test or consult the literature aspect of corrosion predicted it.

2. The corrosion resistance of stainless steel

304 is a versatile stainless steel wire mesh, it is widely used to produce good overall performance requirements (corrosion resistance and formability) of equipment and parts.

301 stainless steel in the deformation showing a significant hardening phenomenon, is used to require a higher intensity on various occasions.

302 stainless steel is essentially a higher carbon content of 304 stainless steel wire mesh variant, can make it through the cold rolling to obtain a higher strength.

302B is a high silicon content of stainless steel, it has high temperature oxidation resistance.

303 and 303Se are cutting stainless steel containing sulfur and selenium, the main requirements for cutting and surface Guanghao high occasions.
303Se stainless steel is also necessary for the production of hot forging parts, because in such conditions, this steel has good hot workability.

304L is a low carbon 304 stainless steel variant, for the need for welding applications. Lower carbon content makes it close to the weld heat affected zone to minimize carbide precipitation, and carbide precipitation may lead to intergranular corrosion of stainless steel in certain environments (welding erosion).

304N is a nitrogen-containing stainless steel, add nitrogen to increase the strength of steel.

305 and 384 stainless steel wire mesh with high nickel, the hardening rate is low, suitable for cold forming requires a variety of occasions.

308 stainless steel for the production of electrodes.

309,310,314 and 330 stainless steel wire mesh, nickel-chromium content is higher, in order to improve steel antioxidant properties and creep strength at high temperatures. The 30S5 and 310S but 309 and 310 stainless steel variants, which differ only a lower carbon content, in order to make near the weld to minimize carbide precipitation. 330 stainless steel has a particularly high resistance to carburization ability and thermal shock resistance.

316 and 317 stainless steel wire mesh with aluminum, which in marine and chemical industry environment point of corrosion resistance substantially better than the 304 stainless steel. Among them, 316 stainless steel by the variants include low-carbon stainless steel 316L, 316N nitrogen and high strength stainless steel combined with higher sulfur content cutting stainless steel 316F.

321,347 and 348 respectively of titanium, niobium plus tantalum, niobium stabilized stainless steel, suitable for welding components used at high temperatures. 348 is a suitable nuclear power industry, stainless steel, tantalum, and combined amount of drilling has certain limitations.