Provided is a mold flux used for casing a cast slab, the mold flux including, bases on a total wt % of thereof, 32-38 wt % of aluminum oxide (Al.sub.2O.sub.3), 8-12 wt % of strontium oxide (SrO), 8-12 wt % of potassium oxide (K.sub.2O), 8-12 wt % of fluorine (F), 5-8 wt % of boron oxide (B.sub.2O.sub.3), 3-5 wt % of lithium oxide (Li.sub.2O), and inevitable impurities. Thus, according to the mold flux, a change in components due to silicon oxide (SiO.sub.2) and calcium oxide (CaO) may be suppressed or prevented compared to those in the conventional art.

Provided is a mold flux used for casing a cast slab, the mold flux including, bases on a total wt % of thereof, 32-38 wt % of aluminum oxide (Al.sub.2O.sub.3), 8-12 wt % of strontium oxide (SrO), 8-12 wt % of potassium oxide (K.sub.2O), 8-12 wt % of fluorine (F), 5-8 wt % of boron oxide (B.sub.2O.sub.3), 3-5 wt % of lithium oxide (Li.sub.2O), and inevitable impurities. Thus, according to the mold flux, a change in components due to silicon oxide (SiO.sub.2) and calcium oxide (CaO) may be suppressed or prevented compared to those in the conventional art.

A support unit for a roll shaft of a continuous casting guide roll includes a housing having first axial end face, a second axial end face and a through-opening extending from the first axial end face to the second axial end face, a first cover connected to the first axial end face, a first primary isolator arranged radially between the first cover and the roll shaft, and a bearing in the through opening. On a first side of the bearing, a first closed space is partially defined by the bearing, the first cover and the first primary isolator, and the first closed space is pre-filled with a lubricant.

A support unit for a roll shaft of a continuous casting guide roll includes a housing having first axial end face, a second axial end face and a through-opening extending from the first axial end face to the second axial end face, a first cover connected to the first axial end face, a first primary isolator arranged radially between the first cover and the roll shaft, and a bearing in the through opening. On a first side of the bearing, a first closed space is partially defined by the bearing, the first cover and the first primary isolator, and the first closed space is pre-filled with a lubricant.

Described herein is a stabilized lubricant composition for use in steel casting, in particular in continuous casting processes. In particular, the lubricant composition for processes for producing steel by continuous casting includes a dispersion of a lubricant powder, for an ingot mold, in continuous casting, in an oily liquid means, and a stabilization additive, characterized in that it has the following shear thinning index values: TABLE-US-00001 RVT 0.1/1 1/10 10/100 100/1000 STI 3.0-7.5 2.0-6.5 1.0-3.0 0.5-2.0 wherein RVT is the ratio between two different shear speeds and STI is the shear thinning index corresponding to the RVT values.

Described herein is a stabilized lubricant composition for use in steel casting, in particular in continuous casting processes. In particular, the lubricant composition for processes for producing steel by continuous casting includes a dispersion of a lubricant powder, for an ingot mold, in continuous casting, in an oily liquid means, and a stabilization additive, characterized in that it has the following shear thinning index values: TABLE-US-00001 RVT 0.1/1 1/10 10/100 100/1000 STI 3.0-7.5 2.0-6.5 1.0-3.0 0.5-2.0 wherein RVT is the ratio between two different shear speeds and STI is the shear thinning index corresponding to the RVT values.

Provided herein is a system, apparatus, and method for venting a direct chill casting mold by venting excess casting gas and retaining oxide from atop a casting during the direct chill casting process. Methods of venting casting gas from a direct chill casting mold include: supplying the direct chill casting mold with molten metal through a transition plate; supplying a casting gas through a casting surface of the direct chill casting mold; venting the casting gas from a gas pocket in the transition plate, wherein venting the casting gas from the gas pocket in the transition plate is performed in response to a pressure of the casting gas in the gas pocket reaching a predetermined pressure.

Described herein is a stabilized lubricant composition for use in steel casting, in particular in continuous casting processes. In particular, the lubricant composition for processes for producing steel by continuous casting includes a dispersion of a lubricant powder, for an ingot mold, in continuous casting, in an oily liquid means, and a stabilization additive, characterized in that it has the following shear thinning index values:

TABLE-US-00001 RVT 0.1/1 1/10 10/100 100/1000 STI 3.0-7.5 2.0-6.5 1.0-3.0 0.5-2.0 wherein RVT is the ratio between two different shear speeds and STI is the shear thinning index corresponding to the RVT values.

Described herein is a stabilized lubricant composition for use in steel casting, in particular in continuous casting processes. In particular, the lubricant composition for processes for producing steel by continuous casting includes a dispersion of a lubricant powder, for an ingot mold, in continuous casting, in an oily liquid means, and a stabilization additive, characterized in that it has the following shear thinning index values:

TABLE-US-00001 RVT 0.1/1 1/10 10/100 100/1000 STI 3.0-7.5 2.0-6.5 1.0-3.0 0.5-2.0 wherein RVT is the ratio between two different shear speeds and STI is the shear thinning index corresponding to the RVT values.

In the mold powder, the content of F is 0.5% by mass or less (including 0% by mass), CaO and SiO.sub.2 are included as main components, the mass ratio of CaO to SiO.sub.2 (CaO/SiO.sub.2) is 0.6 to 1.4, the content of B.sub.2O.sub.3 is 0.3 to 2.8% by mass, the content of Na.sub.2O is 5.0 to 20.0% by mass, the total content of Li.sub.2O and K,0 is 0 to 4.0% by mass, the content of MgO is 0 to 3.5% by mass, the content of Al.sub.2O.sub.3 is 1.0 to 8.0% by mass, and the content of MnO is 1.0% by mass or less (including 0% by mass).