A special continuous casting mold mold powder for csp medium carbon low alloy and its application

Abstract

The invention discloses a special continuous casting mold mold flux for medium-carbon and low-alloy CSP and its application, which comprises the following components in parts by mass: CaO: 29.5-34.5 parts, SiO 2 : 30.5-35 parts, Al 2 o 3 : 2.5‑4.5 parts, Fe 2 o 3 : 0.5‑2.0 parts, MgO: 1.2‑3.5 parts, Na 2 O: 7.5‑11.5 parts, MnO 2 : 1.5‑3.0 parts, F ‑ : 6.5-10 copies, C: 4-7 copies. The above-mentioned mold flux is suitable for CSP continuous casting at a casting speed of 4-5m / min, which not only can realize continuous casting to quickly form a billet shell, but also prevent the billet shell from forming cracks, so that the continuous casting of high-speed medium-carbon and low-alloy steel can proceed smoothly.

Description

technical field

[0001] The invention relates to the technical field of mold slag, and in particular to a special continuous casting mold mold slag for medium-carbon and low-alloy CSP and its application. Background technique

[0002] At present, the binary alkalinity of mold flux for carbon steel continuous casting mold in conventional CSP is between 1.16-1.22, the melting point is controlled at 1050-1090°C, and the viscosity is controlled at 0.08-0.11Pa.S at 1300°C. The corresponding chemical Component weight percent is CaO: 31.5-35.5 parts, SiO 2 : 26.5-31.5 parts, Al 2 o 3 : 3.0-5.5 parts, Fe 2 o 3 : 0.5-2.2 parts, MgO: 1.0-3.5 parts, Na 2 O: 8.5-12.0 parts, F - : 8.0-11.5 parts, C: 4-6.5 parts. During the use of medium-carbon low-alloy steel, this formula has high crystallization rate, good heat transfer ability, and can effectively solve the problem of cracks on the surface of the slab. However, in medium-carbon low-alloy steel, the liquid steel contains many inc...

Examples

Embodiment 1

[0026] A CSP medium-carbon and low-alloy continuous casting mold powder, which includes the following components: CaO, SiO 2 、Al 2 o 3 , Fe 2 o 3 , MgO, Na 2 O, MnO 2 , F - , C, the weight percentages of the above components are respectively: 30.2 parts, 34.4 parts, 2.5 parts, 0.8 parts, 2.0 parts, 7.8 parts, 2.6 parts, 7.1 parts and 5.6 parts.

[0027] The raw materials for the preparation of the above-mentioned CSP medium-carbon and low-alloy continuous casting mold powder include: glass powder, fluorite powder, cement clinker, industrial soda ash, Degussa carbon black, flake graphite powder, wollastonite powder, bentonite, calcite, Magnesia, manganese carbonate, bauxite, binder, the corresponding weight percentages of each raw material are respectively: 9.0 parts, 6.6 parts, 8.2 parts, 5.1 parts, 2 parts, 2.5 parts, 50 parts, 1.5 parts, 3.1 parts, 1.6 copies, 4 copies, 2.9 copies, and 2 copies.

[0028] The binary basicity (CaO / SiO 2 The mass percentage) is 0.88, a...

Embodiment 2

[0032] A CSP medium-carbon and low-alloy continuous casting mold powder, which includes the following components: CaO, SiO 2 、Al 2 o 3 , Fe 2 o 3 , MgO, Na 2 O, MnO 2 , F - , C, the weight percentages of the above components are respectively: 32.1 parts, 33.5 parts, 3.3 parts, 0.9 parts, 1.7 parts, 8.5 parts, 2.6 parts, 7.5 parts and 5.4 parts.

[0033] The raw materials for the preparation of the above-mentioned CSP medium-carbon and low-alloy continuous casting mold powder include: glass powder, fluorite powder, cement clinker, industrial soda ash, Degussa carbon black, flake graphite powder, wollastonite powder, bentonite, calcite, Magnesia, manganese carbonate, bauxite, binder, the weight percentages corresponding to each raw material are respectively: 8.5 parts, 7.1 parts, 8.6 parts, 5.4 parts, 2 parts, 2.5 parts, 48.5 parts, 1.4 parts, 3.6 parts, 1.4 copies, 4 copies, 3.7 copies, and 2 copies.

[0034] The binary basicity (CaO / SiO 2 The mass percentage) is 0.96,...

Embodiment 3

[0038] A CSP medium-carbon and low-alloy continuous casting mold powder, which includes the following components: CaO, SiO 2 、Al 2 o 3 , Fe 2 o 3 , MgO, Na 2 O, MnO 2 , F - , C, the weight percentages are 33.5 parts, 32.5 parts, 4.2 parts, 1.2 parts, 2.4 parts, 10.0 parts, 2.6 parts, 8.1 parts and 5.6 parts respectively.

[0039] The raw materials for the preparation of the above-mentioned CSP medium-carbon and low-alloy continuous casting mold powder include: glass powder, fluorite powder, cement clinker, industrial soda ash, Degussa carbon black, flake graphite powder, wollastonite powder, bentonite, calcite, Magnesia, manganese carbonate, bauxite, binder, the weight percentages corresponding to each raw material are respectively 5.9 parts, 4.6 parts, 9.5 parts, 6.3 parts, 2 parts, 2.4 parts, 47 parts, 1.7 parts, 4.4 parts, 1.5 parts parts, 4 parts, 3.9 parts and 2 parts.

[0040] The binary basicity (CaO / SiO 2 The mass percentage) is 1.03, and the physical indicato...

technical field

[0001] The invention relates to the technical field of mold slag, and in particular to a special continuous casting mold mold slag for medium-carbon and low-alloy CSP and its application. Background technique

[0002] At present, the binary alkalinity of mold flux for carbon steel continuous casting mold in conventional CSP is between 1.16-1.22, the melting point is controlled at 1050-1090°C, and the viscosity is controlled at 0.08-0.11Pa.S at 1300°C. The corresponding chemical Component weight percent is CaO: 31.5-35.5 parts, SiO 2 : 26.5-31.5 parts, Al 2 o 3 : 3.0-5.5 parts, Fe 2 o 3 : 0.5-2.2 parts, MgO: 1.0-3.5 parts, Na 2 O: 8.5-12.0 parts, F - : 8.0-11.5 parts, C: 4-6.5 parts. During the use of medium-carbon low-alloy steel, this formula has high crystallization rate, good heat transfer ability, and can effectively solve the problem of cracks on the surface of the slab. However, in medium-carbon low-alloy steel, the liquid steel contains many inc...

Examples

Embodiment 1

[0026] A CSP medium-carbon and low-alloy continuous casting mold powder, which includes the following components: CaO, SiO 2 、Al 2 o 3 , Fe 2 o 3 , MgO, Na 2 O, MnO 2 , F - , C, the weight percentages of the above components are respectively: 30.2 parts, 34.4 parts, 2.5 parts, 0.8 parts, 2.0 parts, 7.8 parts, 2.6 parts, 7.1 parts and 5.6 parts.

[0027] The raw materials for the preparation of the above-mentioned CSP medium-carbon and low-alloy continuous casting mold powder include: glass powder, fluorite powder, cement clinker, industrial soda ash, Degussa carbon black, flake graphite powder, wollastonite powder, bentonite, calcite, Magnesia, manganese carbonate, bauxite, binder, the corresponding weight percentages of each raw material are respectively: 9.0 parts, 6.6 parts, 8.2 parts, 5.1 parts, 2 parts, 2.5 parts, 50 parts, 1.5 parts, 3.1 parts, 1.6 copies, 4 copies, 2.9 copies, and 2 copies.

[0028] The binary basicity (CaO / SiO 2 The mass percentage) is 0.88, a...

Embodiment 2

[0032] A CSP medium-carbon and low-alloy continuous casting mold powder, which includes the following components: CaO, SiO 2 、Al 2 o 3 , Fe 2 o 3 , MgO, Na 2 O, MnO 2 , F - , C, the weight percentages of the above components are respectively: 32.1 parts, 33.5 parts, 3.3 parts, 0.9 parts, 1.7 parts, 8.5 parts, 2.6 parts, 7.5 parts and 5.4 parts.

[0033] The raw materials for the preparation of the above-mentioned CSP medium-carbon and low-alloy continuous casting mold powder include: glass powder, fluorite powder, cement clinker, industrial soda ash, Degussa carbon black, flake graphite powder, wollastonite powder, bentonite, calcite, Magnesia, manganese carbonate, bauxite, binder, the weight percentages corresponding to each raw material are respectively: 8.5 parts, 7.1 parts, 8.6 parts, 5.4 parts, 2 parts, 2.5 parts, 48.5 parts, 1.4 parts, 3.6 parts, 1.4 copies, 4 copies, 3.7 copies, and 2 copies.

[0034] The binary basicity (CaO / SiO 2 The mass percentage) is 0.96,...

Embodiment 3

[0038] A CSP medium-carbon and low-alloy continuous casting mold powder, which includes the following components: CaO, SiO 2 、Al 2 o 3 , Fe 2 o 3 , MgO, Na 2 O, MnO 2 , F - , C, the weight percentages are 33.5 parts, 32.5 parts, 4.2 parts, 1.2 parts, 2.4 parts, 10.0 parts, 2.6 parts, 8.1 parts and 5.6 parts respectively.

[0039] The raw materials for the preparation of the above-mentioned CSP medium-carbon and low-alloy continuous casting mold powder include: glass powder, fluorite powder, cement clinker, industrial soda ash, Degussa carbon black, flake graphite powder, wollastonite powder, bentonite, calcite, Magnesia, manganese carbonate, bauxite, binder, the weight percentages corresponding to each raw material are respectively 5.9 parts, 4.6 parts, 9.5 parts, 6.3 parts, 2 parts, 2.4 parts, 47 parts, 1.7 parts, 4.4 parts, 1.5 parts parts, 4 parts, 3.9 parts and 2 parts.

[0040] The binary basicity (CaO / SiO 2 The mass percentage) is 1.03, and the physical indicato...