Zhihu netizens ask: Why are alloy elements added to steel?
There are five main strengthening methods for steel, namely solid solution strengthening with carbon addition, displacement strengthening with alloy addition, forging strengthening, fine grain strengthening, and quenching strengthening with heat treatment.
Adding alloying elements is the second largest strengthening method and the main method of metal strengthening.
Adding alloying elements to metals can not only improve strength, but also enhance hardenability and achieve certain special properties.
For example, adding chromium (Cr) to obtain a certain carbon chromium ratio can achieve rust prevention performance.
Metals that require high-temperature operation can be achieved by adding alloys such as tungsten W, molybdenum Mo, cobalt Co, etc.
High speed steel requires both good hardness and wear resistance, so a large amount of alloying elements are added, with a proportion of up to 30%.
All steel is made on the basis of iron, with carbon and alloy added, but the real competition for technology lies in the last three strengthening methods.
Many people seem to have bought the right grade of tool steel, but the performance and usage effect are not satisfactory, all because the last three strengthening methods were not done well.
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Wu Dejian’s tool steel, the chief of staff of the user, bought everything he had used.