The difference between Q345R and Q345
Thread Content
This post was last edited by Black gold on 2011-11-8 19:51. I have a rather silly question: what is the difference between Q235R and Q345? There is another type of pressure vessel; in terms of materials, are forgings necessary?
Q235R is used as steel plate specifically for containers; its mechanical properties as well as the content levels of its constituent elements are guaranteed. Q235 may only guarantee the mechanical properties or only the element content levels. Pressure vessels of a certain type do not require forged materials at all.
There is a typo in the original poster’s question; the question should be “What is the difference between Q345R and Q345?” There is no grade called Q235R. They fall under different standards: the Q345R standard is GB713-2008, while the Q345 standard is GB/T1591-1994. Q345R is merely a type of steel plate; there are no other variants. It has higher requirements in various aspects compared to Q345, and is designed specifically for use in pressure vessels. Q345 is used for high-strength structures.
What was said upstairs is correct – Q345R is a type of plate used for pressure vessels, while Q345 belongs to the low-alloy category
The one with R is container steel. . . Those without R are just ordinary. .
Q345R and Q345 are both low-alloy steels with roughly the same cost; they were previously known as 16Mn. Q345R is designed for pressure vessels, with its composition meeting the requirements for welding strength. :D