What are the structural steel & where they are used

What are the structural steel & where they are used..

1.STANDARD QUALITY STEEL Fe410-s,Fe410Cu-S Used in
structural work where welding is suitable.
2.HIGH TENTION STEEL Fe570-HT Fe540-HT Used in structure
where fabriction is done by method other than welding.
3. ORDINARY QUALITY STEEL Fe310-o,Used for general
Engineering Purpose such as Doors & windows frames, window
bars,Grills,Gates, Hand Rallings ,Builders Hardware etc.
other than wind load, such as plateform roofs, foot over
bridges,office buildings etc.

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