Q235 hot plate classification: usually rolled into the main: wire rod or round steel, square steel, flat steel, angle steel, I-beam, channel steel, window frame steel and other steel, medium-thick steel.

Q235 hot plate use:
1. A large number of applications in construction and engineering structures. Used to make steel bars or build factory buildings, high-voltage transmission towers, bridges, vehicles, boilers, containers, ships, etc., and also used as mechanical parts that do not require high performance.
2, can be used for a variety of abrasive handles and other non-essential abrasive parts.
3. Q235 steel is used as the punch material. It is directly used after quenching without tempering. The hardness is 36~40HRC, which solves the phenomenon that the punch is broken during use.

Comparison between Q235 hot plate and Q345 hot plate

1. The lower limit of yield strength of Q235 hot plate is 235MPa, and the lower limit of yield strength of Q345 is 345MPa.

2, the alloy content of the two is different: Q235 hot plate is ordinary carbon steel, Q345 is low alloy steel

Q235 is a carbon structural steel, compared with the old standard GB700-79 brand A3, C3

Q345 is a low alloy structural steel, compared with the old standard 1591-88 grades 12MnV, 16Mn 16MnRE, 18Nb, 14MnNb

Q235--Metal structural parts, carburized or cyanide parts with low core strength requirements, tie rods, connecting rods, hooks, couplers, bolts and nuts, sleeves, shafts and welded parts

Q345--Comprehensive mechanical properties, low temperature performance, good plasticity and weldability, used as medium, low pressure vessels, oil tanks, vehicles, cranes, mining machinery, power stations, bridges, structures, mechanical parts, building structures General metal structural parts, used in hot-rolled or normalized state, can be used in various structures in cold regions below -40 °C.

According to the specific conditions of your design, if the structure is strength control, you can consider using Q345. If the structure is stiffness control, you can consider the Q235 price Q345 is slightly more expensive, but because of its high strength, it can save materials. The above points are comprehensively compared.

Q235\Q345 is divided according to the yield strength of steel, namely 235MPa and 345MPa respectively. Q345 is slightly more expensive, but the price difference is not very large.