Semi-steel roll and preparation method thereof

Abstract

The invention relates to a semi-steel roll and a preparation method thereof, belonging to the technical field of steel rolling. The semi-steel roll contains the following chemical components according to the mass percent: 1.65-1.90 of C, 0.80-1.15 of Cr, 0.35-0.65 of Si, 0.60-1.00 of Mn, 0.30-0.60 of Mo, 0.20-0.80 of Ni, 0.05-0.10 of K, 0.05-0.10 of Na, 0.05-0.15 of Ti, 0.05-0.15 of Nb, 0.08-0.15 of Y, 0.03-0.08 of Mg, 0.02-0.04 of Zn, 0.06-1.00 of Al, less than 0.04 of P, less than 0.03 of S, and the balance of Fe. The semi-steel roll has reasonable chemical component, prolonged service life, the hardness of 55-58 HS and the tensile strength of 900-950 MPa and the impact toughness of 10-12 J / cm2; the invention can save the nickel resource, reduce the cost, simplify the heat treatment, shorten the production period, improve the heat treatment efficiency, save the energy, thin the solidified organization, improve the forms and the distribution uniformity of carbides and inhibit the aliquation of alloy elements;.

Description

technical field

[0001] The invention belongs to the technical field of steel rolling, and in particular relates to a semi-steel roll and a preparation method of the semi-steel roll. Background technique

[0002] Semi-steel rolls are widely used in hot rolling production because of their excellent strength, toughness and wear resistance. Semi-steel has its unique properties as a roll material, especially as a roll material for profiles, rods, wire rods and blooming stands. It has become the development direction from ductile iron to semi-steel. Semi-steel rolls are suitable for billet rolling mills, large profile rolling mills, medium-sized rolling mills, universal section steel rolling mills, hot continuous rough rolling mills and hot continuous rolling finishing mills ( previous paragraph) and so on. The performance of the material is mainly determined by the structure. Due to the characteristics of its composition design, the microstructure of semi-steel is generally com...

Examples

Embodiment 1

[0053] Using an electric furnace to smelt semi-steel rolls, the manufacturing process steps are:

[0054] A) stock preparation, stock preparation by the mass percentage of the chemical composition in the semi-steel roll target product, specifically see Table 1;

[0055] B) Mix and heat ordinary steel scrap, pig iron, ferrochrome, nickel plate and ferromolybdenum, add ferrosilicon and ferromanganese after the molten steel is melted, then raise the temperature of molten steel to 1500°C, and add aluminum, adjust the composition before the furnace to pass Raise the temperature to 1518°C, add ferro-titanium and ferro-niobium directly into the furnace, and then take it out of the furnace;

[0056] C) tapping, in the tapping process, when the molten steel is tapping 60%, the mass percent is 23-28% Y, 30-43% Si, and the balance is the yttrium-based rare earth alloy of Fe, roasted at 350°C Over KMnO 4 The sodium-containing substances and metal zinc that are the products of potassium-co...

Embodiment 2

[0065] Using an electric furnace to smelt semi-steel rolls, the manufacturing process steps are:

[0066] A) prepare materials, prepare materials according to the mass percentage of the chemical composition in the semi-steel roll target product, specifically see Table 3;

[0067] B) Mix and heat ordinary steel scrap, recarburizer, ferrochromium, nickel plate and ferromolybdenum, add ferrosilicon and ferromanganese after the molten steel is melted, then raise the temperature of molten steel to 1483°C, and add aluminum, adjust the composition before the furnace After passing the test, raise the temperature to 1505°C, add ferro-titanium and ferro-niobium directly into the furnace, and then take it out of the furnace;

[0068] C) tapping, in the tapping process, when the molten steel is tapping 40%, the mass percent is 23-28% Y, 30-43% Si, and the balance is a yttrium-based rare earth alloy of Fe, which is roasted at 350°C Over KMnO 4 The sodium-containing substances and metal z...

Embodiment 3

[0077] Using an electric furnace to smelt semi-steel rolls, the manufacturing process steps are:

[0078] A) prepare materials, prepare materials according to the mass percentage of the chemical composition in the semi-steel roll target product, specifically see Table 5;

[0079] B) Mix and heat ordinary steel scrap, pig iron, ferrochrome, nickel plate and ferromolybdenum, add ferrosilicon and ferromanganese after the molten steel is melted, then raise the temperature of molten steel to 1490°C, and add aluminum, adjust the composition before the furnace to pass Raise the temperature to 1510°C, add ferro-titanium and ferro-niobium directly into the furnace, and then take it out of the furnace;

[0080] C) tapping, in the tapping process, when the molten steel is tapping 50%, the mass percent is 23-28% Y, 30-43% Si, and the balance is an yttrium-based rare earth alloy of Fe, roasted at 350°C Over KMnO 4 The sodium-containing substances and metal zinc that are the products of p...

technical field

[0001] The invention belongs to the technical field of steel rolling, and in particular relates to a semi-steel roll and a preparation method of the semi-steel roll. Background technique

[0002] Semi-steel rolls are widely used in hot rolling production because of their excellent strength, toughness and wear resistance. Semi-steel has its unique properties as a roll material, especially as a roll material for profiles, rods, wire rods and blooming stands. It has become the development direction from ductile iron to semi-steel. Semi-steel rolls are suitable for billet rolling mills, large profile rolling mills, medium-sized rolling mills, universal section steel rolling mills, hot continuous rough rolling mills and hot continuous rolling finishing mills ( previous paragraph) and so on. The performance of the material is mainly determined by the structure. Due to the characteristics of its composition design, the microstructure of semi-steel is generally com...

Examples

Embodiment 1

[0053] Using an electric furnace to smelt semi-steel rolls, the manufacturing process steps are:

[0054] A) stock preparation, stock preparation by the mass percentage of the chemical composition in the semi-steel roll target product, specifically see Table 1;

[0055] B) Mix and heat ordinary steel scrap, pig iron, ferrochrome, nickel plate and ferromolybdenum, add ferrosilicon and ferromanganese after the molten steel is melted, then raise the temperature of molten steel to 1500°C, and add aluminum, adjust the composition before the furnace to pass Raise the temperature to 1518°C, add ferro-titanium and ferro-niobium directly into the furnace, and then take it out of the furnace;

[0056] C) tapping, in the tapping process, when the molten steel is tapping 60%, the mass percent is 23-28% Y, 30-43% Si, and the balance is the yttrium-based rare earth alloy of Fe, roasted at 350°C Over KMnO 4 The sodium-containing substances and metal zinc that are the products of potassium-co...

Embodiment 2

[0065] Using an electric furnace to smelt semi-steel rolls, the manufacturing process steps are:

[0066] A) prepare materials, prepare materials according to the mass percentage of the chemical composition in the semi-steel roll target product, specifically see Table 3;

[0067] B) Mix and heat ordinary steel scrap, recarburizer, ferrochromium, nickel plate and ferromolybdenum, add ferrosilicon and ferromanganese after the molten steel is melted, then raise the temperature of molten steel to 1483°C, and add aluminum, adjust the composition before the furnace After passing the test, raise the temperature to 1505°C, add ferro-titanium and ferro-niobium directly into the furnace, and then take it out of the furnace;

[0068] C) tapping, in the tapping process, when the molten steel is tapping 40%, the mass percent is 23-28% Y, 30-43% Si, and the balance is a yttrium-based rare earth alloy of Fe, which is roasted at 350°C Over KMnO 4 The sodium-containing substances and metal z...

Embodiment 3

[0077] Using an electric furnace to smelt semi-steel rolls, the manufacturing process steps are:

[0078] A) prepare materials, prepare materials according to the mass percentage of the chemical composition in the semi-steel roll target product, specifically see Table 5;

[0079] B) Mix and heat ordinary steel scrap, pig iron, ferrochrome, nickel plate and ferromolybdenum, add ferrosilicon and ferromanganese after the molten steel is melted, then raise the temperature of molten steel to 1490°C, and add aluminum, adjust the composition before the furnace to pass Raise the temperature to 1510°C, add ferro-titanium and ferro-niobium directly into the furnace, and then take it out of the furnace;

[0080] C) tapping, in the tapping process, when the molten steel is tapping 50%, the mass percent is 23-28% Y, 30-43% Si, and the balance is an yttrium-based rare earth alloy of Fe, roasted at 350°C Over KMnO 4 The sodium-containing substances and metal zinc that are the products of p...