Q235 ordinary carbon structural steel, also known as A3 board. Ordinary carbon structural steel – general plate is a kind of steel material.

Q represents the yielding limit of this material, the latter 235, is the yield value of this material, in 235MPa or so. 16mm <plate thickness / diameter ≤ 40mm, the yield strength of 225MPa; 40mm <plate thickness / diameter ≤ (thickness ≤ 16mm); the thickness of the material is less than the thickness of the material; The yield strength is 205MPa; the yield strength is 215MPa; 60mm <plate thickness / diameter ≤100mm, the yield strength is 205MPa; 100mm <plate thickness / diameter≤150mm, the yield strength is 195MPa; 150mm <plate thickness / diameter≤200mm; As the carbon content is moderate, comprehensive performance is better, strength, plasticity and welding performance is better with the most widely used.

Grades introduced
display method
The complete representation is: Q235 – quality grade symbols · deoxidation method symbols.
Quality grade points A, B, C, D, E, followed by A-level quality is poor, E-class the highest quality. The deoxidation methods are denoted as F, b, Z and TZ, respectively, boiling, semi-killed, killed and special killed steels. However, the notation for Z and TZ may be omitted in the grade designation.Q235A, Q235B, Q235C, Q235D, Q235E represent the different grades, mainly the impact of the temperature is different.

Element content
A, B, C, D sulfur content decreased in turn; A and B of the same phosphorus content, C followed by the phosphorus content, D phosphorus content of the least

Chemical composition
Q235 points A, B, C, D four (GB / T 700-2006)
Q235A grade containing C ≤ 0.22% Mn 0.3% -0.65% Si ≤ 0.35% S ≤ 0.050 P ≤ 0.045
Q235B grade containing C ≤ 0.20% Mn 0.3% -0.7% Si ≤ 0.35% S ≤ 0.045 P ≤ 0.045
Q235C grade containing C ≤0.17% Mn 0.35% -0.8% Si ≤0.35% S ≤ 0.040 P ≤ 0.040
Q235D grade containing C ≤ 0.17% Mn 0.35% -0.8% Si ≤ 0.35% S ≤ 0.035 P ≤ 0.035