What do "Q" and "235" represent in Q235 steel plate?
A: Q stands for the first letter of the pinyin for yield strength. 235 indicates that the yield strength of this steel is ≥235MPa (when the thickness is ≤16mm).
What type of steel is Q235 steel plate?
A: It belongs to carbon structural steel, a typical representative of low-carbon steel. It contains no alloying elements or only trace amounts of alloying elements, and the sulfur and phosphorus content is controlled within the standard range for ordinary carbon steel.
What are some common sub-grades of Q235?
A: The core sub-grades are Q235A, Q235B, Q235C, and Q235D. The main differences lie in the impact toughness requirements and the control of sulfur and phosphorus content. The later the letter, the lower the impurity content and the better the low-temperature toughness.
What is the national standard for Q235 steel plate?
A: The mainstream standard is GB/T 700-2006 "Carbon Structural Steel". For special manufacturing of steel plates, GB/T 3274-2017 "Hot-rolled Steel Plates and Strips of Carbon Structural Steel and Low Alloy Structural Steel" can also be referenced.
What is the difference between Q235 steel plate and Q235 steel strip?
A: Steel strip is a continuously rolled product in coil form, with a thinner thickness (usually 0.5-10mm); steel plate is a flat product made from steel strip after leveling and shearing, which can be cut to length as needed, with a wider thickness range (1-600mm+).