Q345R

Q345R steel plate is the most used materials to build specified elevated boilers and pressure vessels,with good mechanical properties and process performance, it is China's most widely used, the largest amount of special steel pressure vessel.The best equivalent steel grade with Q345R is A516 Grade 70 in specification ASTM A516/A516M.

Q345R steel contains a certain amount of alloy elements, yield strength tends to be high.

Mechnical Property for Q345R Pressure Vessel Steel:

Thickness (mm)
Q345R > 3 ≤ 16 > 16 ≤ 36 > 36 ≤ 60 >60 ≤ 100 >100 ≤ 150 >150
Yield strength (≥Mpa) 345 325 315 305 285 265
Tensile strength (Mpa) 510-640 500-630 490-620 480-610 470-600

Chemical Composition for Q345R Pressure Vessel Steel (Heat Analysis Max%)

Main chemical elements composition of Q345R
C Si Mn P S Alt (min.)
0.20 0.55 1.20-1.60 0.025 0.015 0.020

Q345R is a combination of 16Mng, 19 Mng and GB6654-1996, and GB150 specified the thickness range is 3 ~ 200mm. The limit value of the tensile strength with low carbon content and standard is no more than 540Mpa, and it has good weldability, in common conditions cold and hot crack are not easy to form. However, the same as the 20 # carbon manganese structure steel, with large thickness and in low ambient temperature working environment, it produces cold, hot cracks.

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