We (UnionSSM) will introduce you the main Chinese Standards for Structure Steels in this blog. GB means "Chinese national standard" in English. Mandatory standards are prefixed with "GB"; The recommended standard is prefixed with "GB/T".
Q355 steel is a Chinese low alloy high strength structural steel, it equivalent to S355, with minimum value of yield strength 355 MPa and tensile strength is 470-630 Mpa. This article shows the details of Properties, Composition & Equivalent for Q355.
Q235 steel is a plain carbon structural steel which is widely used in China. Q235 material equivalent to ASTM A36, and S235, tensile strength is 370-500 MPa; yield strength is 235 MPa. This article shows the details of Properties, Composition & Equivalent for Q235.