Q:In the Chinese standard, does Q195 mean hot-rolled sheet or cold-rolled sheet?

Q195 (ASTM Gr.B (σs185)) may be either hot rolled or cold rolled steel plate, depending on the actual need. The differences between cold-rolled steel and hot-rolled steel are not in the smelting process, but in the rolling temperature, or the termination temperature of the rolled steel. The final rolling temperature is lower than the recrystallisation temperature of the steel becomes cold rolled steel. Hot-rolled steel is easy to roll and has high rolling efficiency, but the steel oxidises under hot-rolling conditions and the surface of the product is black and grey and dull. Cold rolled steel requires a large mill power, low rolling efficiency, and the rolling process in order to be able to eliminate process hardening but also intermediate annealing, so the cost is also higher, but the cold rolled steel surface bright, good quality, can be used directly to process finished products, so in practice more Q195 to indicate the cold rolled steel.

Time：05/06/2023 09:42:27