What are the factors of the performance and organization of stainless steel wire
The decisive role of chromium in stainless steel: There is only one element that determines the properties of stainless steel wire, which is chromium, and each stainless steel contains a certain amount of chromium. So far, there is no chromium-free stainless steel. The basic reason why chromium has become the main element that determines the performance of stainless steel is that the addition of chromium as an alloying element to steel promotes the contradictory movement within it to develop in terms of resistance to corrosion damage.
This change can be explained from the following aspects:
① Chromium increases the electrode potential of iron-based solid solution
②Chromium absorbs iron electrons to passivate iron
Passivation is a phenomenon in which the corrosion resistance of metals and alloys is increased due to the prevention of anode reaction. There are many theories that constitute passivation of metals and alloys, mainly including film theory, adsorption theory and electron arrangement theory.
How to make the oxide scale of 304 stainless steel wire heat treated uniformly distributed
If 304Stainless steel wireWhen oil stains are attached to the surface during heat treatment, the thickness of the oxide scale will be different from that where there is no oil stains, and it will be carburized. The metal under the oxide scale will be corroded by the acid in the pickling process. Do not touch the stainless steel wire during heat treatment, because fingerprints will also affect the quality of the heat-treated oxide scale.
If the stainless steel wire is found to have oil stains before thermal processing, it should be degreased in trichloroethylene degreasing agent and caustic soda solution and then cleaned with warm water, and then heat treated.
The atmosphere in the 304 stainless steel wire furnace is different in various parts, and the composition of the oxide scale will also change, which is also the cause of unevenness after pickling. Therefore, when heating, the atmosphere of each part in the furnace is the same.
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