If you would like to know the mild steel material, may we need to understand the carbon steel. Generally, carbon steel can be divided into 4 categories.
Low carbon steel (carbon content is not more than 0.30%).
Middle carbon steel (carbon content is 0.30% ~ 0.60%).
High carbon steel (carbon content is 0.60% ~ 1.00%).
Free-cutting steel.
The properties and processing characteristics of carbon steel mainly depend on the content of carbon and manganese, and the purity of the steel.
And what is the classification of mild steel material?
Low carbon steel can be divided into two groups based on the carbon content.
The first group refers to low carbon steel with a carbon content of less than 0.15%.The second group refers to low carbon steel with a carbon content of 0.15% to 0.30%.Mild Steel belongs to a category in the second group. That is a category with a carbon content of 0.15% to 0.30% and an Mn content of not more than 0.75%.
It should be noted that mild steel is a special one in the second group of low carbon steel. Mild steel material generally has good weldability. But due to a certain hardening tendency, pre-weld preheating may be required when the manganese content is high. The cross section is thick, or the joints are highly restrained. When the thickness of the welded joint is greater than 25mm. Especially when the carbon content of the substrate exceeds 0.22%. The mild steel needs to be preheated to about 40 ° C. And after the welding is completed, the stress release heat treatment temperature of the weld zone is about 525 ° C ~ 675 ° C.
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