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Stainless steel or stainless iron?can making production line
316 stainless steel has good welding performance.All standard welding methods are available for welding.When welding, 316Cb, 316L or 309Cb stainless steel filler rod or electrode can be used for welding according to the purpose.In order to obtain the best corrosion resistance, the welding section of 316 stainless steel needs to be annealed after welding.If 316L stainless steel is used, no post-weld annealing is required.
5. Mechanical properties
Austenitic stainless steel has the lowest yield of all steel.Therefore, in terms of mechanical properties, austenitic stainless steel is not the best material for the stem, because the diameter of the stem will increase to ensure a certain strength.The yield point cannot be improved by heat treatment but can be improved by cold forming.
Because of the wide application of austenitic stainless steel, people are under the false impression that all stainless steel has no magnetism.Austenitic stainless steels are generally understood to be non-magnetic, as is the case with hardened-forged steels.But the 304 treated by cold forming is somewhat magnetic.For cast steel, 100% austenitic stainless steel is not magnetic.
7. Low-carbon stainless steel
The corrosion resistance of austenitic stainless steel comes from the chromium oxide coating formed on the metal surface.If the material is heated to 450 ℃ to 900 ℃ high temperature, the structure of the material will change, along the edge of crystal form of chromium carbide.In this way, no chromium oxide protective layer can be formed on the edge of the crystal, which leads to the reduction of corrosion resistance.This corrosion is called intergranular corrosion.
8. Why does stainless steel rust?
Why does stainless steel rust?When the stainless steel tube surface appears brown rust spot (point), people feel surprised: think that "stainless steel is not rust, rust is not stainless steel, may be steel problems".In fact, this is a one-sided view of the lack of understanding of stainless steel.Stainless steel will rust under certain conditions.
Stainless steel has the ability to resist atmospheric oxidation, that is, rust, but also has the ability to contain acid, alkali, salt in the medium is corrosion resistance, that is, corrosion resistance.However, the corrosion resistance of steel varies with its chemical composition, protective condition, service condition and environmental media type.For example, 304 steel pipe has absolutely excellent anti-rust ability in the dry and clean atmosphere, but it will soon rust if moved to the coastal area in the sea fog containing a large amount of salt.The 316 pipe performed well.Therefore, not any kind of stainless steel, in any environment can resist corrosion, not rust.
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