Q235A carbon structural steel

Q235 has five grades: A, B, C, D, and E. A is 40 degrees above zero, B is 20 degrees above zero, C is above zero, D is 20 degrees below zero, and E is 40 degrees below zero.
This performance is required in colder regions.

Q235A, Q235B, Q235C, Q235D are the distinctions of grades, which are mainly due to the different impact temperatures.

The difference between A, B, C, and D refers to the difference in impact temperature in their properties. They are:
Q235A grade, no impact;
Q235B grade, is 20 degrees normal temperature shock;
Q235C grade, is 0 degree impact;
Q235D grade, is -20 degree impact.
At different shock temperatures, the value of shock is also different.

In terms of mechanical properties, Grade A only guarantees the conventional tensile strength, yield strength and elongation; Grade B starts to increase the 180°C cold bending and impact energy at room temperature, Grade C guarantees impact energy at 0°C, and Grade D guarantees impact energy at -20°C , the lowest value is 27J.

However, it is generally not easy to purchase C grades on the market, and D grades are even more impossible. Most of them are replaced by B-level after passing the composition and performance re-examination to meet the C-level requirements.

Q235A has good toughness and plasticity, has a certain elongation, and has good welding performance and hot workability.

Q235A is generally used in the hot-rolled state, and the rolled section steel, steel bar, steel plate, and steel pipe can be used to manufacture various welded structural parts, bridges and some common machine parts, such as bolts, tie rods, rivets, collars and connecting rods Wait.

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