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化学成分
C ≤0.20
Si ≤0.50
MN ≤1.60
屈服 ≥355
抗拉 510～630
伸长 ≥24
表面分类
普通级表面（FA） 酸洗表面
表面允许有深度（或高度）不超过钢板厚度公差之半的麻点、凹面、划痕等轻微、局部的缺欠，但应保证钢板及钢带允许的*小厚度。
较*表面（FB） 酸洗表面
表面允许有不影响成型性的局部缺欠，如轻微划伤、轻微压痕、轻微麻点、轻微辊印及色差等
Chemical compositionC ≤ 0.20
Si ≤ 0.50
MN ≤ 1.60
Yield ≥ 355
Tensile strength 510 ~ 630
Elongation ≥ 24
5 Surface Classification
Ordinary level surface (FA) pickling surface
Allow the surface depth (or height) of not more than half of the plate thickness tolerance of pitting, concave, scratches and other minor, localized defect, but should ensure minimum allowable steel sheet and strip thickness.
Higher surface (FB) pickling surface
Surface does not affect formability allow local imperfections, such as minor scratches, slight indentation, minor pitting, roller printing and color and other minor
