Material issues
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What issues should be considered when using Q345R with a thickness of over 30 mm?
1. Supply in normalized condition. 2. Ultrasonic testing is recommended. 3. 100% radiographic inspection. 4. Post-weld heat treatment
The last edit to this post was made by Menghuan100 on 2017-2-3 at 16:33; the specification of 150 applies when using 345R in the normalized state, with a value greater than 36
Note: It’s 30mm already! Is it interesting? Just do as it should be done. Nothing special. These are all the steel types with the highest consumption in the country. How much worse could it get? :lol
For Q345R, ultrasonic testing is required only when the thickness is greater than 36 mm, and it must be used in the normalized state; heat treatment is necessary when the thickness is greater than 32 mm (or greater than 38 mm when preheated to over 100 degrees). GB150.4 specifies that for Q345R weld joints with a thickness greater than 30 mm, full non-destructive testing must be carried out.
According to GB150-2011, 30mm is no longer a dividing line; the manufacturing quality in this industry has generally improved, and the performance of the materials is guaranteed.
According to the old standards, heat treatment should be applied. It’s more relaxed now.