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A kind of high-manganese medium-thick plate with excellent ultra-low temperature toughness and preparation method thereof

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

Active Publication Date: 2020-01-14
NORTHEASTERN UNIV LIAONING
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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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  • A kind of high-manganese medium-thick plate with excellent ultra-low temperature toughness and preparation method thereof
  • A kind of high-manganese medium-thick plate with excellent ultra-low temperature toughness and preparation method thereof
  • A kind of high-manganese medium-thick plate with excellent ultra-low temperature toughness and preparation method thereof

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Experimental program
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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 plate with excellent ultra-low temperature toughness, the chemical composition of which 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 hot-rolled steel product, rolling pass, starting rolling temperature, finish 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 room temperature to obtain a ...

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

A high-manganese medium-thick plate with excellent ultra-low temperature toughness and a preparation method thereof, belonging to the technical field of iron and steel materials, the chemical composition of the medium-thick plate is: C: 0.31-0.67%, Si: 0.02-0.48%, Mn: 22.0- 27.3%, P: ≤0.08%, S: ≤0.06%, Al: 1.5~4.64%, the balance is Fe and unavoidable impurities; preparation method: 1) billet heating and heat preservation; 2) conduct a Rolling in stages to obtain hot-rolled steel; 3) cooling the hot-rolled steel to obtain a high-manganese medium-heavy plate with excellent toughness at -196°C; the high-manganese medium-heavy plate of the present invention can be used in the rolled state, and has excellent ultra-low temperature toughness and High strength, without adding alloy elements, the cost is much lower than 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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Patent Type & Authority Patents(China)
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 LIAONING
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