1000 MPa-grade high-strength and high-plasticity hot-rolled steel plate and manufacturing method thereof

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: 2016-09-07
NORTHEASTERN UNIV
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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

Method used

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  • 1000 MPa-grade high-strength and high-plasticity hot-rolled steel plate and manufacturing method thereof
  • 1000 MPa-grade high-strength and high-plasticity hot-rolled steel plate and manufacturing method thereof
  • 1000 MPa-grade high-strength and high-plasticity hot-rolled steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

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

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

[0029]

[0030] The manufacturing method follows the following steps:

[0031] (1) According to the ingredients in Table 1, smelt molten steel in a pressurized induction furnace, evacuate and make the temperature of molten steel reach 1600℃;

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

[0033] (2) The ingot is heated to 1200°C with the furnace and kept for 1h, then after 8 passes of hot rolling, the start rolling temperature and the final rolling temperature are 1160°C and 860°C, respectively. After the hot rolling, it is cooled to ro...

Example Embodiment

[0035] Example 2

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

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

[0038]

[0039] The manufacturing method follows the following steps:

[0040] (1) According to the ingredients in Table 2, smelt molten steel in a pressurized induction furnace, evacuate and make the temperature of molten steel reach 1580℃;

[0041] When the pressure in the furnace is lower than 5 Pa, nitrogen with a purity of 99.9993% is filled to make the nitrogen pressure in the furnace reach 3 atmospheres. The nitrogen pressure in the furnace must be raised to 4 atmospheres before casting, and the pressure must be maintained for 35 minutes after casting to obtain an ingot;

[0042] (2) Heat the ingot with the furnace to 1200°C and keep it for 2h, then go through 7 passes of hot rolling. The start-rolling temperature and the final rolling temperature are 1160°C and 840°C, respectively. After the hot rolling, coo...

Example Embodiment

[0044] Example 3

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

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

[0047]

[0048] The manufacturing method follows the following steps:

[0049] (1) According to the ingredients in Table 3, smelt molten steel in a pressurized induction furnace, evacuate and make the temperature of molten steel reach 1550℃;

[0050] When the pressure in the furnace is lower than 5Pa, fill in nitrogen with a purity of 99.9993% to make the nitrogen pressure in the furnace reach 2 atmospheres. Before casting, the nitrogen pressure in the furnace needs to be increased to 6 atmospheres. After casting, continue to maintain Press for 40 minutes to get an ingot;

[0051] (2) Heat the ingot with the furnace to 1150°C and keep it for 2h, then after 9 passes of hot rolling, the opening and finishing temperatures are 1100°C and 810°C, respectively. After the hot rolling, cool to room temperature in the...

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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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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
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