Both Q235D and Q235B are carbon structural steels. Ordinary carbon structural steel plate is a type of steel.
The "Q" represents the yield strength of the material, and the "235" at the end refers to the yield value of the material, which is approximately 235 MPa.
Chemical Composition
Q235B: C ≤ 0.20; Mn ≤ 1.40; Si ≤ 0.35; S ≤ 0.045; P ≤ 0.045.
Q235D: C ≤ 0.17; Mn ≤ 1.40; Si ≤ 0.35; S ≤ 0.035; P ≤ 0.035.
Low-Temperature Impact Toughness
Q235D: -20°C impact toughness test performed.
Q235B: Room-Temperature (20°C) impact toughness test performed.
Q235B is suitable for applications where performance requirements are guaranteed at room temperature (20°C), while Q235D requires performance to be maintained at -20°C.
Strength and Plasticity:
Both have similar yield strength (≥235 MPa) and tensile strength (375–500 MPa);
However, due to its pure composition and rigorous manufacturing process, Q235D exhibits superior plasticity and low-temperature stability.
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