1018 Carbon Steel Plate Material Carbon Steel Material Grade 1018 Heat Treatable Yes Heat Treatment Case Hardened Mechanical Finish Polished Overall Length 6 ft Overall Width 7 in Thickness 0.25 in Thickness Tolerance +0.000 in/-0.0013 in Yield Strength 54 000 psi Fabrication Cold Finished Machinability 78 Percent Rockwell Hardness Not Rated Tensile Strength 80 000 psi Width Tolerance +0.000 in/-0.0013 in Standards ASTM A108 ASTM A29 Brinell Hardness 70 Shape Plate