Q390GJC construction steel plate flaw detection level and heat treatment process

Executive standard of Q390GJC construction steel plate: GB/T 19879.

Q390GJC steel plate flaw detection level: class I detection, class II detection, class III detection; Standards can be implemented: here are three common implementation standards: JB/T 4730, GB/T2970 and NB/T 47013.3-2015. Other inspection standards can also be implemented, which can be negotiated by both parties.

Q390GJC construction steel plate heat treatment process: controlled rolling, normalizing, normalizing tempering, TMCP, TMCP+tempering; The corresponding heat treatment method can be selected according to the setting.

The quality grade of Q390GJC is C, and the impact temperature is 0℃. Other levels include Q390GJB, Q390GJD and Q390GJE.

Z-direction performance of Q390GJC steel plate: Q390GJC-Z15, Q390GJC-Z25, Q390GJC-Z35. Z-direction performance refers to the tear resistance of steel plate in the thickness direction.