Ultralow-temperature excellent-tenacity high-manganese medium-thick plate and preparation method thereof

An ultra-low temperature, high manganese technology, applied in the field of steel materials, can solve the problems of low strength, high price, difficult welding, etc., and achieve the effect of excellent ultra-low temperature toughness and high strength

Active Publication Date: 2018-09-07
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the traditional materials used in LNG storage tanks are mostly aluminum alloy, austenitic stainless steel, 9% Ni steel, Invar alloy, etc., but these materials have certain disadvantages, such as high price, low strength, expensive welding materials, Welding is difficult, etc. Therefore, it is urgent to develop economical high-performance LNG storage tank materials

Method used

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  • Ultralow-temperature excellent-tenacity high-manganese medium-thick plate and preparation method thereof
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  • Ultralow-temperature excellent-tenacity high-manganese medium-thick plate and preparation method thereof

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Effect test

Embodiment 1

[0029] A high-manganese plate with excellent ultra-low temperature toughness, the chemical composition of which is: C: 0.5%, Si: 0.146%, Mn: 23.96%, P: 0.004%, S: 0.002%, Al: 2.01%, The balance is Fe and unavoidable impurities.

[0030] A method for preparing a high-manganese medium-thick plate with excellent ultra-low temperature toughness, the specific steps are as follows:

[0031] (1) Smelt molten steel according to the composition design and cast it into 1# and 2# steel billets with a thickness of 74mm, heat the steel billets to 1200°C and keep them warm for 2 hours;

[0032] (2) The 1# and 2# steel billets after heating are carried out one-stage rolling respectively, obtain the hot-rolled steel product, rolling pass, starting rolling temperature, final rolling temperature, single pass reduction rate, total reduction rate are as follows Table 1, the thickness of hot-rolled steel is shown in Table 2;

[0033] (3) The hot-rolled steel is water-cooled to room temperature t...

Embodiment 2

[0043] A high-manganese medium-thick plate with excellent ultra-low temperature toughness, its chemical composition by weight percentage is: C: 0.67%, Si: 0.48%, Mn: 25.8%, P: 0.019%, S: 0.006%, Al: 3.64%, The balance is Fe and unavoidable impurities.

[0044] A method for preparing a high-manganese medium-thick plate with excellent ultra-low temperature toughness, the specific steps are as follows:

[0045] (1) According to the composition design, the molten steel is smelted and cast into 3# and 4# billets with a thickness of 112mm, and the billets are heated to 1000°C and kept for 2.5h;

[0046] (2) The 3# and 4# steel billets after heating are carried out one-stage rolling respectively, obtain the hot-rolled steel product, rolling pass, starting rolling temperature, final rolling temperature, single pass reduction rate, total reduction rate are as follows Table 4, the thickness of hot-rolled steel is shown in Table 5;

[0047] (3) The hot-rolled steel is water-cooled to r...

Embodiment 3

[0057] A high-manganese medium-thick plate with excellent ultra-low temperature toughness, its chemical composition by weight percentage is: C: 0.31%, Si: 0.12%, Mn: 24.9%, P: 0.06%, S: 0.004%, Al: 1.96%, The balance is Fe and unavoidable impurities.

[0058] A method for preparing a high-manganese medium-thick plate with excellent ultra-low temperature toughness, the specific steps are as follows:

[0059] (1) According to the composition design, the molten steel is smelted and cast into 5# and 6# billets with a thickness of 55mm, and the billets are heated to 1150°C and kept for 3 hours;

[0060] (2) The 5# and 6# steel billets after heating are carried out one-stage rolling respectively, obtain the hot-rolled steel product, rolling pass, starting rolling temperature, final rolling temperature, single pass reduction rate, total reduction rate are as follows Table 7, the thickness of hot-rolled steel is shown in Table 8;

[0061] (3) The hot-rolled steel is water-cooled to ...

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Abstract

The invention discloses an ultralow-temperature excellent-tenacity high-manganese medium-thick plate and a preparation method of the medium-thick plate, and belongs to the technical field of steel materials. The medium-thick plate is prepared from, by weight, 0.31-0.67% of C, 0.02-0.48% of Si, 22.0-27.3% of Mn, 0.08% or less of P, 0.06% of less of S, 1.5-4.64% of Al and the balance Fe and inevitable impurities. The preparation method comprises the steps that 1, a steel blank is heated and kept warm; 2, the heated steel blank is rolled in the first stage to form a hot-rolled steel material; and3, the hot-rolled steel material is cooled, and the -196 DEG C excellent-tenacity high-manganese medium-thick plate is obtained. The high-manganese medium-thick plate can be used after being rolled and has excellent ultralow-temperature tenacity and high strength, alloy elements do not need to be added, and the cost is far lower compared with 9Ni steel.

Description

technical field [0001] The invention belongs to the technical field of iron and steel materials, and in particular relates to a high-manganese medium-thick plate with excellent ultra-low temperature toughness and a preparation method thereof. Background technique [0002] With the improvement of people's awareness of environmental protection, natural gas, as the cleanest energy, has been paid more and more attention to its development and utilization, and will become the fastest-growing fossil fuel in the next few decades. However, due to its wide geographical distribution, the distribution of liquefied natural gas resources in various places is not balanced, and the transportation of liquefied natural gas (LNG) has become more and more important. my country's demand for natural gas resources is growing rapidly. From 2001 to 2015, my country's natural gas has an annual growth rate of 15.9%. By 2020, my country's liquefied natural gas needs to import 140 billion m3, and seabo...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/02
CPCC21D8/0205C21D8/0226C22C38/02C22C38/04C22C38/06
Inventor 刘振宇任家宽陈俊陈其源王国栋
Owner NORTHEASTERN UNIV
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