Building collapses and residential elevator accidents caused by disasters continue to occur. At the same time, steel bars are widely used in various fields such as houses, bridges, railways, roads, tunnels, etc. as the skeleton material of concrete structures. However, there are no mandatory standar

The steel industry is an important basic industry of the national economy. Recently, six mandatory national standards for the steel industry were released, involving three standards each for steel bars and steel wire ropes, and will be implemented on September 25.The six key product mandatory nation