Do you really know about the gap between high grade steel of domestic and abroad?

In the field of marine engineering equipment and high-tech shipboard critical steel, China urgently needs to develop high-end varieties. At present, from the perspective of consumption, 90% of China's steel for marine equipment can be self-sufficient, but in terms of specifications, the steel used for high-end marine equipment, which accounts for 70% of the grade, is either blank or heavily dependent on imports.

In aviation (aerospace) engines and high-temperature alloys for gas turbines, China is still in the follow-up phase. However, objectively speaking, the gap between the level of research and production of high-temperature alloys in China and the advanced countries is getting closer.

In the new high-speed rail and urban rail steel, China's development is not balanced. At present, China's EMU vehicle technology is in a running or leading position worldwide, but the key materials in key technologies such as wheelsets, bogies and transmissions are still in the running or running phase. Among them, China's high-speed wheel application time is short, research and development started relatively late, the process of reference, absorption and reinvention is also short, the accumulation of original innovation and application data is less, still partly dependent on imports; in terms of high-speed axles The axles of the domestic EMUs mainly depend on imports. There is a lack of systematic technical reserves in the EMU axle technical requirements and material technology standards. In terms of high-speed bearings, the EMUs used by domestic OEMs are all of the axlebox bearings used in Europe. Japan, China's vacuum degassing bearing steel metallurgy quality stability and fatigue life and foreign high-quality vacuum degassing steel (high-iron bearing steel) there is a certain gap.

Regarding the steel used for the structural and key components of large aircraft, the overall level of our country can basically meet the requirements of national defense industry, equipment manufacturing, and national economic development. However, compared with the international advanced level, there is still a large gap.

Compared with the advanced level in foreign countries, China is in a state of follow-up in the field of structural key steel materials for large aircrafts; further efforts are still required in high-performance theoretical design and calculations, breadth and depth studies, advanced equipment production, and optimization of process parameters.

“High-end equipment steel materials are related to social and economic security and national defense security. They are related to the improvement of China’s industrial core competitiveness. They are related to China’s industrial transformation and upgrading, and are related to the construction of China's industrial independent innovation capabilities. They must make breakthroughs and make up for shortcomings as soon as possible.