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High-strength high-ductility low-density steel plate of 1200 MPa grade and manufacturing method thereof

A high-strength, high-plastic technology, applied in the field of advanced high-strength steel production, can solve difficult problems

Active Publication Date: 2018-09-04
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, strength and toughness are always mutually exclusive, and it is difficult to obtain high strength while still ensuring good plasticity; therefore, there is an urgent need for a low-density steel plate with high strength and high plasticity

Method used

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  • High-strength high-ductility low-density steel plate of 1200 MPa grade and manufacturing method thereof
  • High-strength high-ductility low-density steel plate of 1200 MPa grade and manufacturing method thereof
  • High-strength high-ductility low-density steel plate of 1200 MPa grade and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Molten steel is smelted in a vacuum induction furnace, and cast ingots are obtained after casting, and its composition by mass percentage is: C0.9%, Mn 15%, Al 8%, Ni 1.3%, Ti 0.03%, Si 0.06%, S 0.002% , P 0.002%, the balance is Fe and unavoidable impurities;

[0036]The ingot was heated to 1180°C and held for 1 hour, followed by 9 passes of hot rolling, the starting and finishing temperatures were 1050°C and 820°C, respectively, and water-cooled to room temperature after hot rolling to obtain a 4mm thick hot-rolled plate; The total reduction rate of hot rolling is 96.9%;

[0037] Heat the hot-rolled sheet to 900°C and keep it warm for 2 hours, then water-cool to room temperature to obtain a solution-treated sheet;

[0038] Pickling the solution-treated sheet and then cold-rolling it to a thickness of 1.2mm to obtain a cold-rolled sheet; the total cold-rolling reduction rate is 70%;

[0039] Heat the cold-rolled sheet to 880°C and hold it for 10 minutes, then air-cool...

Embodiment 2

[0041] Method is with embodiment 1, and difference is:

[0042] (1) The composition of the ingot by mass percentage is: C 0.85%, Mn 16.4%, Al 9%, Ni 2.6%, Si0.04%, Ti 0.05%, S 0.002%, P 0.002%;

[0043] (2) Heating to 1200°C and keeping it warm for 2 hours, followed by 10 passes of hot rolling, the starting and finishing temperatures were 1060°C and 850°C respectively, and water cooled to room temperature after hot rolling to obtain a 4.5mm thick hot-rolled sheet ;The total reduction rate of hot rolling is 96.5%;

[0044] (3) Heat the hot-rolled plate to 1050°C and keep it warm for 1h;

[0045] (4) cold rolling to a thickness of 1 mm to obtain a cold rolled plate; the total reduction rate of cold rolling is 78%;

[0046] (5) Heating to 900°C and keeping it warm for 15min, air cooling to room temperature (cooling rate 22°C / s), the tensile strength of the 1200MPa high-strength, high-plasticity low-density steel plate is 1258MPa, the elongation is 35%, and the density is 6.8g / c...

Embodiment 3

[0048] Method is with embodiment 1, and difference is:

[0049] (1) The composition of the ingot by mass percentage is: C 0.92%, Mn 18.3%, Al 10.2%, Ni 3.6%, Si0.03%, S 0.002%, P 0.002%;

[0050] (2) Heating to 1130°C and keeping it warm for 1.5h, followed by 11 passes of hot rolling, the starting and finishing temperatures were 1080°C and 860°C respectively, and water cooled to room temperature after hot rolling to obtain a 3.8mm thick hot rolled plate; the total reduction rate of hot rolling is 97.1%;

[0051] (3) Heat the hot-rolled plate to 1100°C and keep it warm for 0.5h;

[0052] (4) Cold rolling to a thickness of 0.7mm to obtain a cold-rolled sheet; the total reduction rate of cold rolling is 82%;

[0053] (5) Heating to 970°C and keeping it warm for 2min, air cooling to room temperature (cooling rate 28°C / s), the tensile strength of the 1200MPa high-strength, high-plasticity low-density steel plate is 1279MPa, the elongation is 31%, and the density is 6.6g / cm 3 ; m...

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Abstract

The invention relates to a high-strength high-ductility low-density steel plate of the 1200 MPa grade and a manufacturing method thereof. The high-strength high-ductility low-density steel plate is prepared from the following components according to mass percent: 0.7 to 1% of C, 13 to 20% of Mn, 8 to 11% of Al, 1 to 4% of Ni, less than 0.1% of Si, less than 0.01% of S, less than 0.01% of P, 0 to 0.1% of Ti, 0 to 0.1% of Nb and 0 to 0.15% of V; the tensile strength is 1200 to 1300 MPa, the elongation is 30 to 40%, and the density is 6.5 to 7 g / cm<3>. The manufacturing method comprises the following steps of (1) smelting molten steel according to the components, and pouring; (2) heating to 1100 to 1200 DEG C, performing hot rolling after heat preservation, and performing water cooling to theroom temperature after hot rolling is finished; (3) heating to 900 to 1100 DEG C, and performing water cooling after heat preservation; (4) performing cold rolling after pickling; and (5) heating to800 to 1000 DEG C, and performing air cooling after heat preservation. The low-density steel plate has high strength and high ductility.

Description

technical field [0001] The invention belongs to the technical field of advanced high-strength steel production, and specifically relates to a 1200MPa high-strength high-plasticity low-density steel plate and a manufacturing method thereof. Background technique [0002] In recent years, with the rapid development of my country's economy and industry, problems such as resource scarcity and environmental constraints have become increasingly apparent; advanced high-strength steel is a new type of steel that has emerged in recent years, which can ensure good plasticity and formability while obtaining high strength. Widely used in industries such as automobiles, bridge engineering, transmission towers, offshore platforms, oil and gas pipelines, and shipbuilding; improving the mechanical properties of advanced high-strength steels such as strength and plasticity can not only effectively reduce the weight of industrial products, but also improve their safety. Thereby reducing fuel con...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/06C22C38/08C22C38/02C22C38/14C22C38/12C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0236C21D8/0247C21D8/0273C21D2211/001C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14
Inventor 刘海涛张宝光王超杜盼盼张晓明
Owner NORTHEASTERN UNIV
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