低合金钢 、 中合金钢 、 高合金钢 What is low alloy steel , medium alloy steel , high alloy steel
There is a limit. The total amount of alloying elements is less than 5%. For example, the 20 silicon-manganese used today, the maximum silicon is not more than 0.8%, and the manganese is 1.2-1.6%. The maximum value of the two is less than 2. At 5%, it is called low-alloy steel, and it is now in the low-alloy category for construction. What is medium alloy steel? The total amount of alloying elements between 5% and 10% is called medium alloy steel. If the total amount of alloy elements is greater than 10%, it is called high alloy steel.
When there is an alloy element above 10% in steel, it is called high alloy steel. Its brand name is prefixed with the letter X, followed by a number (tens of thousands) representing the average carbon content and alloy element symbols (in order of content), and finally the average percentage value of each major alloy element content (rounded to a whole number) ).
Types and uses of high-alloy steels: There are many types of alloy steels, usually divided into low-alloy steels (contents <5%), medium-alloy steels (contents 5% -10%), and high-alloy steels (contents> 10) according to the content of alloying elements. %); Divided into high-quality alloy steel and special alloy steel according to quality; divided into alloy structural steel, stainless steel, acid-resistant steel, wear-resistant steel, heat-resistant steel, alloy tool steel, rolling bearing steel, alloy spring steel and Special performance steel (such as soft magnetic steel, permanent magnet steel, non-magnetic steel), etc.
What is the difference between high alloy steel and low alloy steel?
The low-alloy steel's formal classification name is-low-alloy high-strength steel, which has a low alloy content and a relatively high impurity content, and is generally used directly without heat treatment. High alloy steel can be divided into alloy structural steel and alloy tool steel. Its alloy content is higher and impurity content is relatively low. Generally, it is used after heat treatment to increase strength and hardness. There are also stainless steel and some special-purpose steels. According to the different added elements, and adopt appropriate processing technology, can obtain high strength, high toughness, wear resistance, corrosion resistance, low temperature resistance, high temperature resistance, non-magnetic and other special properties.
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