The Measures To Improve The Quality Of Carbon-Manganese Steel Rudder Stock

The rudder stock is the shaft on which the rudder blades rotate. The rudder blades are rotated by the rudder stock, and the rudder blades bear the reaction force of water to make the ship turn. The rudder stock is made of cast iron, copper and steel. Among them, the most common material of steel is carbon-manganese steel, but it is easy to cause unqualified products due to MnS inclusions.

The smelting process of carbon-manganese steel rudder stock is: electric furnace smelting → LF + VD refining → vacuum casting + stopper rod argon blowing. In terms of smelting, improvements should be made in terms of sulfur content control, microalloying control, and temperature control.

1. Control Of Sulfur Content

In order to reduce the formation of MnS inclusions and the impact on product quality, the method of adding carbon powder and aluminum powder in the refining furnace is adopted for diffusion deoxidation during the smelting process, and the addition of Al is controlled in the early stage of refining to form a stable reducing environment, which is conducive to deoxidization. [S], the alloy element can be adjusted only when the control [S]≤0.003%.

2. Microalloying Control

Nb is one of the commonly used microalloying elements. Adding a small amount of Nb can stabilize the dislocation structure in the austenite and prevent the further growth of the new phase structure. A small amount of Nb can give the steel an excellent comprehensive performance. In order to improve the mechanical properties of steel, control the precipitation and growth of inclusions at the grain boundaries, and control the addition of 0.035% of Nb during the production process.

3. Temperature Control

Except for endogenous, most of the increase of inclusions in steel comes from foreign inclusions. Especially in the vacuum treatment process, due to the violent agitation of the molten steel, the molten steel washes the ladle strongly, which increases the probability of contamination of the molten steel. Reducing the temperature of molten steel into the vacuum is an effective way to reduce the erosion effect. The temperature of molten steel into the vacuum is reduced from (1650 ± 10) ℃ to (1640 ± 10) ℃.

The size of the sulfide particles is also affected by the solidification rate, and the average diameter of the sulfide increases as the solidification time increases. Lower the pouring temperature of carbon-manganese steel. The pouring temperature is adjusted from (1570±10)℃ to (1560±10)℃, which can effectively control the precipitation and growth of MnS at the grain boundaries.

In summary, by controlling [S]≤0.003%, adding microalloy [Nb]≈0.035%, reducing the temperature of molten steel into vacuum to (1640±10)℃ and adjusting the pouring temperature to (1560±10)℃, etc. , Can effectively improve the quality of carbon-manganese steel ingots for rudder stock.

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