High-static toughness and high-platability fine-grain hot galvanizing dual-phase steel and production method thereof

Abstract

The invention discloses a high-static toughness and high-platability fine-grain hot galvanizing dual-phase steel and a production method thereof, and belongs to the field of metallurgy materials. Thechemical components of the high-static toughness and high-platability fine-grain hot galvanizing dual-phase steel are, by weight, 0.08%-0.12% of C, 1.8%-2.5% of Mn, less than 0.005% of Si, 0.3%-0.5% of Al, 0.04%-0.08% of P, 0.03%-0.06% of Nb, 0.02%-0.05% of Ni, less than 0.005% of S and the balance iron. The production method comprises the steps of vacuum smelting, blank forging, first-stage austenite recrystallization zone rolling, second-stage two-phase zone hot rolling, multi-pass cold rolling and rapid annealing. According to the high-static toughness and high-platability fine-grain hot galvanizing dual-phase steel and the production method thereof, the selective oxidation of alloy elements in the annealing process can be greatly reduced, platability of the steel is improved, and the structure and the performance of the strip steel are optimized.

Description

technical field

[0001] The invention belongs to the field of metallurgical materials, and in particular relates to a high-strength plastic product and high-platability fine-grain hot-dip galvanized dual-phase steel and a preparation method thereof. Background technique

[0002] Energy saving and emission reduction is the theme of the current international community, among which automobile lightweight is the main measure for energy saving and emission reduction, and reducing body weight and improving safety is the most important development direction of the automobile industry. In order to achieve the goal of saving energy, reducing emissions and improving safety, the concept of advanced high-strength steel came into being. As an advanced high-strength steel, dual-phase (DP) steel has been widely used in the modern automobile industry because of its high tensile strength, low yield strength, high initial work hardening rate, low cost and simple preparation process. applicati...

Examples

Embodiment 1

[0023] The high-strength plastic product of this embodiment, high-platability fine-grained hot-dip galvanized DP steel, its chemical composition is: C is 0.11wt.%, Mn is 2.1wt.%, Si is <0.005wt.%, Al is 0.35 wt.%, P is 0.06wt.%, Ni is 0.02wt.%, Nb is 0.04wt.%, S is ≤0.005wt.%, and the balance is Fe

[0024] The production method of the high-strength plastic product of the present embodiment, high-platability fine-grain hot-dip galvanized DP steel is carried out according to the following steps:

[0025] (1) According to the mass percentage: C 0.11%, Mn 2.1%, Si<0.005%, Al 0.35%, P 0.06%, Ni0.02%, Nb 0.04%, S<0.005%, the balance is the set composition of Fe To smelt molten steel, cast a 65Kg billet in a vacuum induction furnace, cut the head and tail of the billet and heat it to 1230°C for 2 hours, forge a rectangular billet with a cross-section of 80mm×80mm at this temperature, and then process it into a 80mm billet with a sawing machine A rectangular billet of ×80mm×100mm is...

Embodiment 2

[0029] The high-strength plastic product of this embodiment, high-platability fine-grain hot-dip galvanized DP steel, its chemical composition is: C is 0.09wt.%, Mn is 2.0wt.%, Si is <0.005wt.%, Al is 0.33 wt.%, P is 0.07wt.%, Ni is 0.03wt.%, Nb is 0.05wt.%, S is ≤0.005wt.%, and the balance is Fe

[0030] The production method of the high-strength plastic product of the present embodiment, high-platability fine-grain hot-dip galvanized DP steel is carried out according to the following steps:

[0031](1) According to the mass percentage: C 0.09%, Mn 2.0%, Si<0.005%, Al 0.33%, P 0.07%, Ni0.03%, Nb 0.05%, S<0.005%, the balance is the set composition of Fe To smelt molten steel, cast a 65Kg billet in a vacuum induction furnace, heat the billet to 1250°C for 2.5 hours, and forge a rectangular billet with a cross-section of 66mm×66mm at this temperature, and then process it with a sawing machine A rectangular billet of 66mm×66mm×80mm is used for hot rolling. In the first stage, h...

Embodiment 3

[0035] The high-strength plastic product of this embodiment, high-platability fine-grain hot-dip galvanized DP steel, its chemical composition is: C is 0.12wt.%, Mn is 2.3wt.%, Si is <0.005wt.%, Al is 0.37 wt.%, P is 0.06wt.%, Ni is 0.02wt.%, Nb is 0.04wt.%, S is ≤0.005wt.%, and the balance is Fe

[0036] The production method of the high-strength plastic product of the present embodiment, high-platability fine-grain hot-dip galvanized DP steel is carried out according to the following steps:

[0037] (1) According to the mass percentage: C 0.12%, Mn 2.3%, Si<0.005%, Al 0.37%, P 0.06%, Ni0.02%, Nb 0.04%, S<0.005%, the balance is the set composition of Fe To smelt molten steel, cast a 65Kg billet in a vacuum induction furnace, cut the head and tail of the billet and heat it to 1270°C for 2.3 hours, forge a rectangular billet with a cross-section of 60mm×60mm at this temperature, and then process it with a sawing machine. A rectangular billet of 60mm×60mm×80mm is used for hot r...

technical field

[0001] The invention belongs to the field of metallurgical materials, and in particular relates to a high-strength plastic product and high-platability fine-grain hot-dip galvanized dual-phase steel and a preparation method thereof. Background technique

[0002] Energy saving and emission reduction is the theme of the current international community, among which automobile lightweight is the main measure for energy saving and emission reduction, and reducing body weight and improving safety is the most important development direction of the automobile industry. In order to achieve the goal of saving energy, reducing emissions and improving safety, the concept of advanced high-strength steel came into being. As an advanced high-strength steel, dual-phase (DP) steel has been widely used in the modern automobile industry because of its high tensile strength, low yield strength, high initial work hardening rate, low cost and simple preparation process. applicati...

Examples

Embodiment 1

[0023] The high-strength plastic product of this embodiment, high-platability fine-grained hot-dip galvanized DP steel, its chemical composition is: C is 0.11wt.%, Mn is 2.1wt.%, Si is <0.005wt.%, Al is 0.35 wt.%, P is 0.06wt.%, Ni is 0.02wt.%, Nb is 0.04wt.%, S is ≤0.005wt.%, and the balance is Fe

[0024] The production method of the high-strength plastic product of the present embodiment, high-platability fine-grain hot-dip galvanized DP steel is carried out according to the following steps:

[0025] (1) According to the mass percentage: C 0.11%, Mn 2.1%, Si<0.005%, Al 0.35%, P 0.06%, Ni0.02%, Nb 0.04%, S<0.005%, the balance is the set composition of Fe To smelt molten steel, cast a 65Kg billet in a vacuum induction furnace, cut the head and tail of the billet and heat it to 1230°C for 2 hours, forge a rectangular billet with a cross-section of 80mm×80mm at this temperature, and then process it into a 80mm billet with a sawing machine A rectangular billet of ×80mm×100mm is...

Embodiment 2

[0029] The high-strength plastic product of this embodiment, high-platability fine-grain hot-dip galvanized DP steel, its chemical composition is: C is 0.09wt.%, Mn is 2.0wt.%, Si is <0.005wt.%, Al is 0.33 wt.%, P is 0.07wt.%, Ni is 0.03wt.%, Nb is 0.05wt.%, S is ≤0.005wt.%, and the balance is Fe

[0030] The production method of the high-strength plastic product of the present embodiment, high-platability fine-grain hot-dip galvanized DP steel is carried out according to the following steps:

[0031](1) According to the mass percentage: C 0.09%, Mn 2.0%, Si<0.005%, Al 0.33%, P 0.07%, Ni0.03%, Nb 0.05%, S<0.005%, the balance is the set composition of Fe To smelt molten steel, cast a 65Kg billet in a vacuum induction furnace, heat the billet to 1250°C for 2.5 hours, and forge a rectangular billet with a cross-section of 66mm×66mm at this temperature, and then process it with a sawing machine A rectangular billet of 66mm×66mm×80mm is used for hot rolling. In the first stage, h...

Embodiment 3

[0035] The high-strength plastic product of this embodiment, high-platability fine-grain hot-dip galvanized DP steel, its chemical composition is: C is 0.12wt.%, Mn is 2.3wt.%, Si is <0.005wt.%, Al is 0.37 wt.%, P is 0.06wt.%, Ni is 0.02wt.%, Nb is 0.04wt.%, S is ≤0.005wt.%, and the balance is Fe

[0036] The production method of the high-strength plastic product of the present embodiment, high-platability fine-grain hot-dip galvanized DP steel is carried out according to the following steps:

[0037] (1) According to the mass percentage: C 0.12%, Mn 2.3%, Si<0.005%, Al 0.37%, P 0.06%, Ni0.02%, Nb 0.04%, S<0.005%, the balance is the set composition of Fe To smelt molten steel, cast a 65Kg billet in a vacuum induction furnace, cut the head and tail of the billet and heat it to 1270°C for 2.3 hours, forge a rectangular billet with a cross-section of 60mm×60mm at this temperature, and then process it with a sawing machine. A rectangular billet of 60mm×60mm×80mm is used for hot r...

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