What is the difference between Q235 material and Q345 material

What is the difference between Q235 material and Q345 material? Q235 material and Q345 material are two grades of steel, namely, two kinds of steel materials.

Q235 material is a common carbon structural steel. Alloy elements are not specially added in Q235 material. The yield strength of Q235 material is 235 MPa, and the former Q is the abbreviation of yield strength. Q235 material is mainly used in construction, bridges, workshops, ships and other buildings and projects.

Q345 material is a kind of low-alloy high-strength steel, which contains a small amount of alloy elements. Q345 material is mainly used in construction and engineering structures. Q345 material is widely used in various welding structures, such as bridges, vehicles, ships, pipelines, boilers, large vessels, storage tanks, heavy machinery, mining machinery, power stations, plant structures, low-temperature pressure vessels, textile machinery parts, etc.

Compared with Q235 material, Q345 material has higher yield strength. And the price of Q345 material is higher than that of Q235 material.