Why is it called Q235?
Q represents the yield limit of this material, followed by 235, which is the yield value of this material, at about 235MPa. And will increase with the thickness of the material and its yield value decreases, due to the moderate carbon content, better overall performance, strength, plasticity and welding and other properties to get a better match, the most widely used.
Can it be further classified?
Yes. There is 4 quality level, A to D. Q235A, Q235B, Q235C, Q235D different grades represent, mainly the impact temperature is different, A refers to do not do impact, B in more than 20 degrees, C in more than 0 degrees, D-20 degrees, A to E is different, refers to their performance in the impact temperature of the difference. They are: Q235A grade, is not impact toughness test requirements; Q235B grade, is for room temperature (20 ℃) impact toughness test; Q235C grade, is for 0 ℃ impact toughness test; Q235D grade, is for -20 ℃ impact toughness test. Impact toughness test using Charpy V-notch specimens. Impact toughness indicators for Akv. B, C, D grade steel in their respective different temperature requirements, are required to achieve Akv ≥ 27 J. In different impact temperatures, the value of the impact is also different.
The difference between the elemental content of the 4 grades
Q235A grade contains C ≤0.22% Mn≤1.4% Si ≤0.35% S ≤0.050% P ≤0.045%
Q235B grade with C ≤ 0.20% Mn ≤ 1.4% Si ≤ 0.35% S ≤ 0.045% P ≤ 0.045% (with the consent of the demander, the carbon content may not be greater than 0.22%)
Q235C grade with C ≤0.17% Mn ≤1.4% Si ≤0.35% S ≤0.040% P ≤0.040%
Q235D grade with C ≤ 0.17% Mn ≤ 1.4% Si ≤ 0.35% S ≤ 0.035% P ≤ 0.035%
What are the uses of Q235 Steel?
①. It is widely used in construction and engineering structures. C and D grade steel can also be used for some professional steel. ② It can be used for various mold handles and other unimportant mold parts. ③ Q235 steel is used as punch material, which is quenched and used directly without tempering, and the hardness is 36~40HRC, which solves the phenomenon of punch breaking in use.
Now you have an initial understanding of Q235 steel, BIGLUX solar trailer use Q235B for the body shell. Q235B has certain elongation, strength, good toughness and castability, easy to punch and weld, widely used in the manufacture of general mechanical parts. It is mainly used for welded structural parts with high quality requirements on construction and bridge projects.
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