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Duplex stainless steel bolts are based on 304 stainless steel bolts, their chromium content is increased, and other iron elements are added so that the original austenitic stainless steel bolts have the properties of a ferrite combination at the same time, which is what we call it The reason for duplex stainless steel bolts. Through the process of basic materials, their elemental composition is controlled. After heat treatment, this duplex stainless steel bolt has strength above 8.8. At the same time, its original anti-corrosion performance has not been affected in any way. After the synthesis of various elements, its anti-corrosion performance is improved compared with the previous state of austenitic 304 stainless steel.
The material number of duplex stainless steel bolts can be represented by the group of numbers 2205. After actual testing, its strength level can reach level 10, and its anti-corrosion performance even exceeds the standard of SUS316 stainless steel bolts. However, the application field of duplex stainless steel bolts is relatively unique, and it is only suitable for some special industries such as ship equipment and high-pressure vessels. Because the cost of duplex stainless steel bolts is relatively high, in general, industrial fields, due to cost considerations, they are generally not selected. duplex stainless steel bolts.
The plasticity of duplex stainless steel bolts is not as good as that of ordinary stainless steel bolts. The equipment with the same power can produce 304 stainless steel bolts, but it cannot produce duplex stainless steel bolts. When it is formed in the cold pier, the equipment needs to have greater extrusion force. Can.
Duplex stainless steel bolts are also divided into four different forms. The first type is low-alloy duplex stainless steel bolts, mainly because there is no molybdenum element in the material. The second type belongs to medium alloy duplex stainless steel bolts, and its corrosion resistance is higher than that of the first type. The third category belongs to high-alloy duplex stainless steel bolts. After experiments, its anti-corrosion performance is more than 25% higher than that of low-alloy duplex stainless steel. The last one is the super duplex stainless steel bolt, which contains high molybdenum and nitrogen in its elemental composition, and even has tungsten and copper content. This super duplex stainless steel bolt is mainly used in the aerospace field.
Generally speaking, if the use environment requirements are relatively high and ordinary bolts cannot meet the requirements, duplex stainless steel bolts can be considered. In an environment containing chlorides, the corrosion of steel is very serious, so duplex stainless steel bolts can be used.
In sour oil and gas environments, ordinary steel cannot withstand long-term corrosion, so duplex stainless steel bolts are mostly used in oil drilling facilities. Seawater is highly corrosive to steel, so duplex stainless steel bolts are also used on ships. Under high-speed motion in the air, the material will heat up, which affects performance, so duplex stainless steel bolts are also used on aircraft.
Dingshang Stainless Steel Co., Ltd. is a supplier of stainless steel pipes in China, specializing in wholesale sales of stainless steel pipes/tubes, welcome to consult.