Normal Q345R is 0℃ impact; The yield strength of Q345R will gradually decrease with the increase of temperature, and the high-temperature mechanical properties test specified in the standard can only reach 450℃. See the standard GB7 13-20 14 for details.

If there are certain requirements for the service temperature of q345r, I suggest futures. If the futures are fixed, we can do some impact test on the temperature of Q345R. If the impact test value meets the requirements, the steel plate can be used at the secondary impact temperature.

I am engaged in steel plate trading. The lowest impact temperature of Q345R I contacted reached -56℃. If you have any requirements for the impact temperature of steel plates, I suggest you roll futures.

I hope the above content will help you!