What r the Hardness & Tensile Strength for High-tensile steel bars? Is it Hardness (200HB) & TS (450 N/mm2)?
Answer:
go to www.matweb.com type in the the type of steel in the search box and it will give you the material properties.
Good Luck!
always use standard norms... so refer this or any other DESIGN DATA BOOK
http://www.atlasmetals.com.au/alloy_stee...
Hardness is usually an R number for Rockwell this usually preceeded by a letter B or C. Your number looks like maybe a Brinell hardness number since Rockwell numbers don't go that high. I think you've got a Brinell hardness of 200 there.
Both methods use this phenomenon: Press down on the material with a known force with a certain size of indenter ball. Then measure the diameter of the crater it forms. The letters B and C in Rockwell hardness testing refer to particular size indenter balls.
Tensile strength is merely the force required to break a specimen divided by the cross section of the specimen. Here the value is 450 Newtons per square millimeter. Of course the specimen could be several square mm but the force per unit area is the same.
As the specimen is pulled apart it sometimes stretches and the area is reduced. This is a consideration in ductile materials amd there is sometimes a percent elongation number with the tensile data.
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