The mechanical properties of No. 20 steel and Q235 are different.
1.The yield point of Q235 steel is 235MPa, and the elongation is 21-26 percent ; it is widely used to make general mechanical parts with certain strength and elongation, such as pins, shafts, tie rods, connecting rods, ferrules, bolts, nuts , cylinders, gears, brackets, racks and welding parts.
2.The yield point of No. 20 steel in the normalized state is 245MPa, and the elongation is >25%; the yield point in the quenched and tempered state is 280MPa, and the elongation is >22 percent . It is widely used to make parts with low loads and high toughness requirements, such as forged tie rods, sleeves, clamps and gaskets in heavy and general machinery, and small and medium-sized carburized and cyanided parts in general machinery, automobiles and tractors.
No. 20 steel is high-quality carbon structural steel, Q235 is carbon structural steel, and the price of No. 20 steel is higher than that of Q235.
Depending on the application, the two steel are generally interchangeable when the load is not large and the requirements are not high.
