Comparison of material properties for steel 20MnCr5 and similar steels ... S355JO steel and S275JR steel are treated as structural steels, while 20MnCr5 steel is named special structural steel and 50CrMo4 steel is named constructional steel. All the mentioned steels have very wide use in mechanical and civil engineering.
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50CrMo4 alloy special steels manufacture also can be called as alloy structural steel. Alloy steel means this kind of grade contains some special alloy composition. Alloy steel plate application is very wide, as : Machine, pressure vessel, construction and so on .