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A 1000mpa grade high-strength and high-plasticity hot-rolled steel plate and its manufacturing method

A hot-rolled steel sheet and high-strength technology, which is applied to 1000MPa-grade high-strength and high-plastic hot-rolled steel sheet and its manufacturing field, can solve the problems of high industrial production cost, difficult smelting, poor processing performance, etc., and achieve the effect of reducing production cost.

Active Publication Date: 2017-10-24
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second-generation advanced high-strength steel has the effect of stabilizing austenite due to the addition of a large number of alloy elements, and a large amount of retained austenite (40-100%) can be obtained at room temperature, so its microstructure is based on austenite. Mainly, it can obtain very excellent mechanical properties, but its processing performance is poor, smelting is difficult, and industrial production costs are high.

Method used

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  • A 1000mpa grade high-strength and high-plasticity hot-rolled steel plate and its manufacturing method
  • A 1000mpa grade high-strength and high-plasticity hot-rolled steel plate and its manufacturing method
  • A 1000mpa grade high-strength and high-plasticity hot-rolled steel plate and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The chemical composition of the high-strength high-plasticity steel in the examples is shown in Table 1.

[0028] Table 1 Chemical Composition (wt.%)

[0029]

[0030] Its manufacturing method is carried out according to the following steps:

[0031] (1) Smelt molten steel in a pressurized induction furnace according to the ingredients and ingredients in Table 1, vacuumize and make the molten steel temperature reach 1600°C;

[0032] When the pressure in the furnace is lower than 5 Pa, nitrogen with a purity of 99.9993% is charged to make the nitrogen pressure in the furnace reach 2 atmospheres. Before casting, raise the nitrogen pressure in the furnace to 5 atmospheres, and keep the pressure for 30 minutes after casting to obtain ingots;

[0033] (2) Heating the cast ingot to 1200°C with the furnace and keeping it warm for 1 hour, followed by 8 passes of hot rolling, the starting and finishing temperatures were 1160°C and 860°C respectively, and cooled to room temp...

Embodiment 2

[0036] The chemical composition of the advanced high-strength steel in this example is shown in Table 2.

[0037] Table 2 Chemical Composition (wt.%)

[0038]

[0039] Its manufacturing method is carried out according to the following steps:

[0040] (1) Smelt molten steel in a pressurized induction furnace according to the ingredients and ingredients in Table 2, vacuumize and make the temperature of molten steel reach 1580°C;

[0041] When the pressure in the furnace is lower than 5 Pa, nitrogen with a purity of 99.9993% is charged to make the nitrogen pressure in the furnace reach 3 atmospheres. Before casting, the nitrogen pressure in the furnace needs to be increased to 4 atmospheres, and after the casting is completed, the pressure needs to be maintained for 35 minutes to obtain ingots;

[0042](2) Heat the cast ingot to 1200°C with the furnace and hold it for 2 hours, then go through 7 passes of hot rolling, the starting temperature and final rolling temperature are...

Embodiment 3

[0045] The chemical composition of the high-strength high-plasticity steel in the examples is shown in Table 3.

[0046] Table 3 Chemical Composition (wt.%)

[0047]

[0048] Its manufacturing method is carried out according to the following steps:

[0049] (1) Smelt molten steel in a pressurized induction furnace according to the ingredients and ingredients in Table 3, vacuumize and make the molten steel temperature reach 1550°C;

[0050] When the pressure in the furnace is lower than 5Pa, fill nitrogen with a purity of 99.9993%, so that the nitrogen pressure in the furnace reaches 2 atmospheres. Before casting, the nitrogen pressure in the furnace needs to be raised to 6 atmospheres. Press for 40 minutes to obtain an ingot;

[0051] (2) Heating the cast ingot to 1150°C with the furnace and holding it for 2 hours, then after 9 passes of hot rolling, the starting and finishing temperatures were 1100°C and 810°C, respectively, and cooled to room temperature in the air afte...

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Abstract

The invention belongs to the technical field of advanced high-strength steel production, and in particular, relates to a 1000 MPa-grade high-strength and high-plasticity hot-rolled steel plate and a manufacturing method thereof. The hot-rolled steel plate comprises the following chemical components: 0.15-0.3% of C, 5-6% of Mn, 0.05-0.12% of N, Si less than 0.2%, S less than 0.01%, P less than 0.01%, 0.002-0.04% of Al, and the balance of Fe. The hot-rolled steel plate is prepared according to the components by such steps as smelting, casting, hot rolling and reverse phase change annealing. A nitrogen microalloying method and effects of strengthening nitrogen element solid solution and stabilizing austenite are used for effectively increasing the content of residual austenite obtained after reverse phase change annealing of the hot-rolled plate and improving the strength and the plasticity of a manganese steel plate in hot rolling; and in addition, the steel plate hardly contains no precious alloy elements, so that the production cost is prominently reduced.

Description

technical field [0001] The invention belongs to the technical field of advanced high-strength steel production, and in particular relates to a 1000MPa grade high-strength and high-plasticity hot-rolled steel plate and a manufacturing method thereof. Background technique [0002] Advanced high-strength steel is a new type of steel that has emerged in recent years and is widely used in industries such as automobiles, bridge engineering, transmission towers, offshore platforms, oil and gas pipelines, and shipbuilding. Compared with traditional ordinary high-strength steel, its biggest advantage is to reduce the thickness and weight of plate members while ensuring mechanical properties. In addition, it also has good formability, anti-collision concave, fatigue resistance, high Excellent work hardening rate and other advantages have shown good application prospects in various industries. The first generation of advanced high-strength steel mainly includes interstitial-free steel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C21D8/02
CPCC21D8/0226C21D8/0263C21D2211/001C21D2211/008C22C38/001C22C38/02C22C38/04C22C38/06
Inventor 刘海涛张宝光李花兵杜盼盼宋子豪黄晓明刘国怀王国栋
Owner NORTHEASTERN UNIV LIAONING
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