... Steel Pipe 1. STANDARD:GB/T3094-2000, GB/T6728-2002, ASTM A500, JIS G 3466, DIN EN 10210, GB/T178-20052. MATERIAL:Q195, Q215 ... we have?Our factory established in 1997, we have 16 years experience in this area.We engaged in research square and rectangular steel ... , GB/T 3094-2000 and GB/T6728-2002.Our products in different sizes, and different thickness (1.0mm-32mm), can satisfy ...