质量等级拉伸试验

钢板厚度/mm断后伸长率A/％≥

下屈服度Rel/MPa抗拉强度/mm屈强比Rel/Rm

6-16>16-50>50-100>100-150>150-200≤100>100-150>150-2006-150>150-200

Q235GJ

B≥235235-345225-335215-325-400-510380-510-≤0.80-23CDEQ345GJB≥345345-455335-445325-435305-415490-610470-610470-610≤0.80≤0.8022CDEQ390GJB≥390390-510380-500370-490-510-660490-640-≤0.83-20CDEQ420GJB≥420420-550410-540400-530-530-680510-660-≤0.83-20CDEQ460GJB≥460460-600450-590440-580-570-720550-720-≤0.83-1