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316l stainless steel pipe

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Post time 2022-6-14 12:36:21 |Show all posts
Ferritic stainless steel stainless steel plate is divided into common ferritic stainless steel and ultra pure ferritic stainless steel two categories, including common ferritic stainless steel, due to the common existing stainless steel with a333 grade 6 pipe high content of carbon, nitrogen, the process of forming and welding are more difficult, the corrosion resistance is also difficult to guarantee, use is restricted, in ultra pure ferritic stainless steel, strictly control the amount of carbon and nitrogen in steel, steel corrosion resistance and comprehensive performance.
Stainless steel plate with high sulfur and phosphorus content in the steel, so the machinability is good, but the weldability poor; Steel cold deformation plasticity is poorer; Cold hardening high strength; Micro crack sensitivity. Under high stress and fork since q corrosion resistant and wear resistant parts. Such as food machinery of the gear shaft, pin, bushing, and plastic forming mould, etc.
Stainless steel plate, compared with common ferritic stainless x60 line pipe steel ultra pure high chromium iron ferrite stainless steel have good uniform corrosion, pitting corrosion and stress corrosion resistance and more used in the petrochemical equipment. Ferritic stainless steel has the following characteristics of welding, welding under the action of high temperature, the heating temperature is above 1000 ℃ heat affected zone of special seam near the grain can grow up sharply, even if the fast cooling after welding, also cannot avoid caused by grain overgrowth of toughness fell sharply and high tendency of intercrystalline corrosion, high chromium ferritic steel itself, harmful or more elements like carbon, nitrogen, oxygen, and brittle 316l stainless steel pipe transition temperature is higher, notch sensitivity is stronger. Therefore, after welding embrittlement phenomenon is relatively serious, in 400 ℃ ~ 600 ℃ heat slow cooling for a long time, there will be 475 ℃ embrittlement, normal temperature toughness in serious decline.
Austenitic stainless steel stainless steel plate x70 line pipe due to the small coefficient of thermal conductivity, electrical flow in the same, get larger penetration than low alloy steel. At the same time, due to its large resistivity, when welding rod arc welding, to avoid the electrode is red, and compared with the diameter of the carbon steel or low alloy steel welding rod, welding current is small, generally do not use large welding line energy. Welding rod arc welding, appropriate USES small diameter of electrode, rapidly multichannel welding, for the high requirement of weld, even pour cold water on the way to speed up the cooling, for pure austenitic stainless steel and austenitic stainless steel.
Stainless steel plate, because of the large hot cracking sensitivity should strictly control the welding line energy, prevent weld grain grew up serious and welding hot crack, for progress of weld thermal cracking performance and corrosion resistance, welding, pay special attention to the welding area clean, avoid harmful element penetration weld, austenitic stainless steel welding generally do not need to preheat. In order to prevent grain growth of weld seam and heat affected zone, and the precipitation of carbides, to ensure that the weld plastic, toughness and corrosion resistant, temperature should be controlled between the lower layer, is generally not more than 150 ℃.
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