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2. The mechanical properties of materials using specific size of plate and round steel experiment, plate thickness and round steel diameter size will get different tensile strength and yield strength, no matter what brand of material is so! The following is the authoritative data of mechanical properties of Q235 in Mechanical Design Manual: steel thickness or diameter less than or equal to 16mm: yield strength 235mpa steel thickness or diameter greater than 16 ~ 40mm: yield strength 225MPa steel thickness or diameter greater than 40 ~ 60mm: yield strength 215mpa steel thickness or diameter greater than 60 ~ 100mm: yield strength 205mpa steel thickness or diameter greater than 100 ~ 150mm: yield strength Degree 195mpa, steel thickness or diameter more than 150 mm: yield strength 185 MPa

3. Area * 5-7