The selection of
stainless steel spring need to consider what factors?
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When selecting stainless steel in corrosion environment, in addition to deal with the working conditions of stainless steel spring has a detailed understanding, also need to consider the main factors are: stainless steel corrosion resistance, strength, toughness and physical properties, processing, formability, resources, price and obtain easily.
A, corrosion resistance, corrosion resistance including stainless and acid resistance, alkali, salt and other corrosive medium and the performance of high temperature oxidation resistance, sulfide, chloride, fluoride and other performance.
Due to choose different stainless steel is mainly to solve various corrosion problems encountered in practical engineering, so the corrosion resistance of stainless steel in corrosion environment is how to select material researchers first need to consider.
Corrosion is between the metal and medium caused by chemical or electrochemical damage, and the corrosion resistance refers to the ability of stainless steel to resist corrosion and damage of medium, so when the materials involved in corrosion resistance, need to pay attention to the following: 1, the corrosion resistance of the standard is for sure, both to admit it, use it, and cannot be bound by it, according to the specific requirements to determine whether the specific standard of corrosion.
At present on the corrosion resistance of stainless steel is used more 10 standard, choose which level as the requirements of corrosion resistance, want to consider equipment, the characteristics of the department is a (
Its thickness, size)
。
Use lifespan, product quality,
Such as impurities, color, purity)
Such as requirements, generally speaking, in the process of using smooth mirror or size precision instrument equipment and components, can choose 1 ~ 3 grade standard;
To require close cooperation, long-term not leak or require the use of equipment, long parts to choose 2 ~ 5, the request is not high maintenance convenient or not long equipment life, parts can choose 4 ~ 7, in addition to a special exception, the stainless steel in the conditions of use next year corrosion rate is more than 1 mm do not choose more commonly, need to point out that 10 level standard for local corrosion is not applicable.
2, corrosion resistance is relative and conditional, often said the stainless stainless steel, the corrosion resistance of point relative to the rust and corrosion resistant, is refers to under certain conditions,
Medium, concentration, temperature, impurities, pressure, flow rate, etc) must be
。
So far has not been in any corrosive environment are not rust resistance, corrosion resistance of stainless steel, so the option of material personnel must according to the specific conditions of use to choose, stainless steel grades is selected, use the department have to choose the correct use of the characteristics of the stainless steel is reasonable material selection and correct use of to achieve has the objective of does not rust or corrosion.
3, choose stainless steel should not only consider the general corrosion resistance, also want to consider the performance of its resistance to local corrosion, and in some water chemical medium, which need more attention, this is because the material researchers generally more importance to the general corrosion resistance of stainless steel, and under the conditions of use, they are for local corrosion, such as sensitivity to the stress corrosion pitting corrosion and so on how to consider less;
The local corrosion of stainless steel is more on the general corrosion resistance good corrosion environment, local corrosion often result in stainless steel equipment, parts of sudden destruction, its harmfulness is far greater than the general corrosion.
4, in the application of all kinds of manual data on the corrosion resistance of stainless steel, attention should be paid to many of these data is just some experimental test results, and the actual medium environment often have larger in and out, in order to get closer to the actual conditions of use of corrosion data, the general should be the actual medium corrosion test in the laboratory or field under the condition of coupon tests necessary for the experiment of analog device.
Under the condition of some use, spring manufacturers generally also encountered this kind of situation, when the work in the media or in the production of industrial products, even trace amounts of some or the metal ions in the stainless steel, will affect the quality of the chemical process industry industrial products (
Including the luster, color, purity, etc. )
。
This kind of situation in the nuclear fuel is most common in the pharmaceutical and dye industries, at this time often choose do not contain some element of stainless steel or appropriate chooses stainless steel corrosion resistance level, so that the reduced to allow the limits of metal ions.
5, stainless steel equipment, if parts failure due to corrosion, should carry out the analysis of the corrosion damage reason, find out the reason after take measures, and should not be a throw it.
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