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Mechanical Property Requirements - As Supplied in the Black Hot Rolled Condition Tensile Strength Mpa Min. Wall Thickness (mm) <16 <25 >25 0.2% Yield Strength Mpa Min. Wall Thickness (mm) <16 <25 <30 <40 <50 <70 Elongation 5.65 % Min. Hardness Brinell Min. 620 610 550 470 460 430 420 410 400 18 180 Typical Mechanical Properties - As Supplied in the Black Hot Rolled Condition Tensile Strength Mpa Yield Strength Mpa Elongation % Hardness HB 690 500 21 210 Typical (Minimum) Mechanical Properties - Water Quenched at 925 oC and Tempered at 580 oC. Tensile Strength Mpa Wall Thickness (mm) <20 <25 <30 0.2% Yield Strength Mpa Wall Thickness (mm) <20 <25 <30 Elongation % Wall Thickness <20 >