Steel grade 907A, grade 10CrNiCu, can also be continuously cast L907A surface naval steel. It has good seawater corrosion resistance and good welding performance. It is 390MPa class naval steel. "High steel high"
907A standard production is implemented in accordance with the national military standard GJB, divided into section steel standards and steel plate standards.
The standard of 907A section steel is GJB6055-2007, and the standard of steel plate is: GJB 8741-2015.
Submarine steel mainly emphasizes that it has good yield resistance, high strength and good weldability. The strength of Meidi’s HY100 is 690MPa (70kgf/ mm2), but there is something better now.
HY130 steel with a strength of 890MPa (91kgf/mm2) is used in the wave-class nuclear submarine. China cannot reach the level of HY130, but there are already more than HY100. Our current submarine steel mainly includes 907A steel, 921A steel and 980 steel, etc. The strengths are respectively 390,590 and 785MPa (40-80kgf/mm2). Among them, 907A is mainly used for conventional submarines, while the top 980 is steel for nuclear submarines.
Under the premise of ensuring the performance of 907A, the supplier and the buyer agree to allow hot-rolled delivery. When used for the premise non-pressure hull, it is allowed to adopt quenched and tempered heat treatment for delivery.
According to the standard, the ready-made thickness of 907A steel plate is basically made.
There are also ultra-thin or ultra-thick L907A that exceeds the standard.