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Grade Quality Grade Manufacturing execution standards
Q355 B、C GB/T 1591
D、E GB/T 1591
Q355 B(AR) GB/T 1591
C(AR) GB/T 1591
D(AR) GB/T 1591
Q355N B、C GB/T 1591
D、E、F GB/T 1591
Q355M B、C GB/T 1591
D、E、F GB/T 1591
Q390 B(AR) GB/T 1591
C(AR) GB/T 1591
D(AR) GB/T 1591