Representation method / Q235B steel plate:
1. By Q + digital + symbol + quality grade symbol of the composition of the deoxidation method. Its steel number is denoted by "Q" and represents the yield point of the steel. The following figures indicate the yield point in MPa. For example, Q235 represents a carbon structural steel with yield point (σs) of 235 MPa.

2. If necessary, the steel can be marked after the quality level and deoxidation method of the symbol. Quality grade symbols are A, B, C, D respectively. Deoxidation method Symbol: F that boiling steel; b said semi-killed steel; Z said the killed steel; TZ said special killed steel, killed steel may not superscript symbols, that Z and TZ are not standard. For example, Q235-AF represents Grade A boiling steel..

3.For carbon steel, such as bridge steel and marine steel, which are used for special purpose, carbon structural steel is basically used, but the letters indicate the use at the end of the steel.

Conventional plate specifications / Q235B steel plate:
Q235B is one of the most common steel, low prices, capable of performing most of the performance requirements of the product is not high.
Thickness range: 2mm-300mm
Width range: 1250mm-2200mm
Length range: 2500mm-11000mm

Chemical composition / Q235B steel plate:
Carbon C: 0.12 to 0.20
Si: ≤0.30
Mn: 0.30 to 0.70
Sulfur S: ≤ 0.045
Phosphorus P: ≤ 0.045
Chromium Cr: Allow the residual content ≤ 0.030
Ni: Allowable residual content ≤ 0.030
Copper Cu: Allow the residual content ≤ 0.030
Note: Deoxidation method: F, b, Z