2. Drum cold rolled steel sheets ThicknessFlatness RollingDirectionCrosswise Total 4%max. 3mm Superior uniform hardness and tensile strength Excellent Paintability : very clean and optimal surface finish [Ra : 0.7 ∼ 1.8 ㎛ ] Excellent flatness and thickness tolerance Characteristics

3. Drum cold rolled steel sheets Mechanical Properties Hardness (HrB) EL min. (%) T.S (kg/mm 2 ) Hardness (HrB) EL min. (%) T.S (kg/mm 2 ) 28 and over Standard Specification 36 ∼ 37 and over 65 and under 37 and over 37 and over 40 ∼ 55 (aiming 45 ∼ 50) 45 ∼ 60 (aiming 50 ∼ 55) 28 and over 28 and over Dongbu Top&Bottom Body Class ※ 1.2mm thickness basis

4. Drum cold rolled steel sheets Oiling Conditions Oil TypeOil Amount(both side) DOS Type 40 ∼ 140mg/m 2 Anti-Rust Type 0.8 ∼ 4g/m 2