... -98)3.Commonly used steel grades and performance of steelCarbon structural steel: Q195, Q215, Q235, Q255, Q275, etc. ... High-strength low-alloy structural steel Quality carbon structural steel and alloy structural steel Special purpose steel4Wall & roof can be ... environmental protection, etcAdvantages:1. Wide span: single span or multiple spans, the max span clear distance is 36m, without ...