Stopper rod for producing free-cutting steel and preparation method thereof
A technology of free-cutting steel and stopper rods, applied in the direction of manufacturing tools, casting equipment, metal processing equipment, etc., can solve problems such as affecting the production of continuous casting tundish operations, increasing refractory consumption, and termination of the tundish pouring process.
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Embodiment 1
[0056] Stopper rods for free-cutting steel production, which are obtained by mixing, drying and trapping the raw materials, then forming them with a cold isostatic press at 150 MPa, drying the blanks obtained after forming at 250°C for 36 hours, and heat-treating at 1100°C for 3 hours.
[0057] The raw materials include: a main material and 10% of liquid phenolic resin and 1% of hexamethylenetetramine which respectively account for the weight of the above main material.
[0058] In terms of weight percentage, the main ingredients include: 15% of magnesium-aluminum spinel particles with a particle size of no more than 2mm, 25% of magnesium-iron spinel particles with a particle size of no more than 2mm, fine magnesium-aluminum spinel particles with a particle size of less than 75μm Powder 29.9%, fused magnesia fine powder with particle size less than 75μm 16%, zirconia fine powder 3%, cerium oxide fine powder 0.1%, natural flake graphite 10%, boron carbide 0.5% and boron nitride ...
Embodiment 2
[0061] Stopper rods for free-cutting steel production are obtained by mixing, drying, and trapping raw materials, and then molding them with a cold isostatic press at 120 MPa. The blanks obtained after molding are dried at 240°C for 36 hours, and then heat-treated at 1100°C for 3 hours.
[0062] The raw materials include: main ingredients and 11% of liquid phenolic resin and 1.1% of hexamethylenetetramine respectively accounting for the weight of the above-mentioned main ingredients.
[0063] In terms of weight percentage, the main ingredients include: 25% of magnesium-aluminum spinel particles with a particle size of no more than 2mm, 22% of magnesium-iron spinel particles with a particle size of no more than 2mm, fine magnesium-aluminum spinel particles with a particle size of less than 75μm Powder 24.9%, fused magnesia fine powder with particle size less than 75μm 12%, zirconia fine powder 3%, cerium oxide fine powder 0.1%, natural flake graphite 10%, boron carbide 1%, boron...
Embodiment 3
[0066] Stopper rods for free-cutting steel production, which are obtained by mixing, drying and trapping the raw materials, and forming them with a cold isostatic press at 130 MPa. The blanks obtained after forming are dried at 235°C for 36 hours, and then heat-treated at 1100°C for 3 hours.
[0067] The raw materials include: a main material and 9.5% of liquid phenolic resin and 0.8% of hexamethylenetetramine respectively accounting for the weight of the above-mentioned main material.
[0068] In terms of weight percentage, the main ingredients include: 22% of magnesium-aluminum spinel particles with a particle size of no more than 2mm, 23% of magnesium-iron spinel particles with a particle size of no more than 2mm, fine magnesium-aluminum spinel particles with a particle size of less than 75μm Powder 15%, fused magnesia fine powder with particle size less than 75μm 24.9%, zirconia fine powder 3%, cerium oxide fine powder 0.1%, natural flake graphite 10%, boron carbide 0.5%, b...
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