In what is termed a Class 1 Steel the alloys indicate tensile strengths of 630 MPa to 1100 MPa and elongations of 10 40% Class 2 Steel indicates tensile strengths of 875 MPa to 1590 MPa and elongations of 5 30% Class 3 Steel indicates tensile strengths of 1000 MPa to 1750 MPa and {HEAD ~ elongations} of {TAIL ~ 0.5 15%} 
In what is termed a Class 1 Steel the alloys indicate tensile strengths of 630 MPa to 1100 MPa and elongations of 10 40 % Class 2 Steel indicates tensile strengths of 875 MPa to 1590 MPa and elongations of 5 30 % Class 3 Steel indicates tensile strengths of 1000 MPa to 1750 MPa and { HEAD ~ elongations } of { TAIL ~ 0.5 15 % }
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