Class A and B ship plates with general strength can meet the technical and mechanical properties requirements by ordinary rolling, so the production process is relatively simple.
However, the production of Grade D, E and RMRS DH32 marine steel plate needs to be achieved by means of controlled rolling and cooling process or heat treatment process with relatively perfect equipment.
At the same time, the inner purity of the billet is required to be high, especially the content of S, P, N, 0, H, etc. in RMRS DH32 Marine steel plate should be strictly controlled.
In order to reduce the cost, it is the best policy to produce RMRS DH32 Marine steel plate by hot rolling or controlled rolling instead of normal rolling.
For RMRS DH32 Marine steel plate with a thickness of less than 35mm, the two-stage controlled rolling method has been adopted.
RMRS DH32 Marine steel plate with a thickness of more than 35mm are mostly produced by hot rolling and normalizing.
In order to ensure the performance of RMRS DH32 Marine steel plate, microalloying technology is adopted. Nb, V, Ti and other alloying elements are added to RMRS DH32 Marine steel plate to achieve the purpose of refining grain and improving strength and toughness in combination with the rolling control process.
Due to the limitation of billet shape and billet weight, many manufacturers cannot produce extra-thick ship plate, we can use large billet or large ingot to roll RMRS DH32 Marine steel plate with thickness greater than 50mm.
