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A kind of rolling method of high manganese plate for lng storage tank

A high-manganese, storage tank technology, applied in metal rolling, metal processing equipment, etc., can solve the problems of ultra-low temperature impact toughness anisotropy, etc., to improve ultra-low temperature impact toughness, reduce the total number of rolling passes, and improve rolling production efficiency effect

Active Publication Date: 2019-12-24
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a rolling method of high manganese plate for LNG storage tanks, which solves the problem of anisotropy in the ultra-low temperature impact toughness of high manganese austenitic steel for LNG storage tanks

Method used

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  • A kind of rolling method of high manganese plate for lng storage tank
  • A kind of rolling method of high manganese plate for lng storage tank
  • A kind of rolling method of high manganese plate for lng storage tank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The chemical composition of high manganese austenitic steel is: C: 0.45%, Si: 0.02%, Mn: 27.3%, P: 0.005%, S: 0.0044%, Cr: 3.9%, Cu: 0.52%, Yu The amount is Fe and unavoidable impurities.

[0045] A method for rolling high manganese plate for LNG storage tanks is realized through the following technical solutions, and the specific steps are as follows:

[0046] Step 1, forging:

[0047] High manganese austenitic steel ingots are forged to open billets at a forging temperature of 1070°C to obtain steel billets;

[0048] Step 2, heating:

[0049] Heat the billet or ingot to 1200°C and keep it warm for 2 hours;

[0050] Step 3, rolling:

[0051] Using the narrow billet widening rolling method, the heated steel billets of sample 2 and sample 3 are subjected to 6 passes of full horizontal rolling or horizontal and vertical alternate rolling, and the rolling start temperature (T in ), single pass reduction rate (R) as shown in Table 1, obtain hot-rolled steel, and hot-ro...

Embodiment 2

[0063] The chemical composition of the high manganese austenitic steel in this example is by weight percentage: C: 0.48%, Si: 0.18%, Mn: 23.9%, P: 0.0070%, S: 0.0054%, Cr: 3.9%, Cu: 0.49 %, V: 0.025%, the balance is Fe and unavoidable impurities.

[0064] A method for rolling high manganese plate for LNG storage tanks is realized through the following technical solutions, and the specific steps are as follows:

[0065] step 1:

[0066] High manganese austenitic steel is smelted at 1650°C, and the obtained molten steel is directly poured into a square mold to obtain a thin ingot with a thickness of 70mm;

[0067] Step 2, heating:

[0068] Heat the billet or ingot to 1200°C and keep it warm for 2 hours;

[0069] Step 3, rolling:

[0070]Thin slab direct rolling method is adopted, the heated ingot is rolled through 4 passes of full longitudinal rolling, and the rolling start temperature (T in ), single pass reduction rate (R) as shown in Table 4, to obtain a hot-rolled steel...

Embodiment 3

[0078] The chemical composition of high manganese austenitic steel is by weight percentage: C: 0.58%, Si: 0.51%, Mn: 23.6%, P: 0.0080%, S: 0.0060%, V: 0.25%, Al: 1.9%, Yu The amount is Fe and unavoidable impurities.

[0079] A method for rolling high manganese plate for LNG storage tanks is realized through the following technical solutions, and the specific steps are as follows:

[0080] step 1:

[0081] High manganese austenitic steel is smelted at 1650°C, and the obtained molten steel is directly poured into a square mold to obtain a thin ingot with a thickness of 70mm;

[0082] Step 2, heating:

[0083] Heat the billet or ingot to 1200°C and keep it warm for 2 hours;

[0084] Step 3, rolling:

[0085] Using the thin slab direct rolling method, the heated ingot is rolled through 7 passes of full longitudinal rolling, and the rolling start temperature (T in ), single pass reduction rate (R) are as shown in Table 5, and the hot-rolled steel obtained, the thickness of hot...

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Abstract

The invention discloses a rolling method for a high-manganese moderate-thickness plate for an LNG storage tank, and belongs to the technical field of steel materials. The rolling method comprises thesteps that firstly, a high-manganese steel cast ingot is directly forged and subjected to cogging into a steel blank, or high-manganese steel is subjected to smelting and pouring to form a thin cast ingot; secondly, the steel blank or the thin cast ingot is heated and subjected to heat preservation; thirdly, a narrow blank broadside rolling method or a thin cast blank direct rolling method is adopted for rolling the steel blank or the thin cast ingot into hot-rolled steel; and fourthly, after cooling, the high-manganese moderate-thickness plate for the LNG storage tank is obtained. According to the rolling method, the thin blank can be used for producing the high-manganese moderate-thickness plate for the LNG storage tank, and the continuous casting production difficulty of heat conductivity coefficient high-manganese austenite steel can be better reduced; the difference of the longitudinal and transverse ultralow-temperature impact toughness of the prepared high-manganese moderate-thickness plate is small, anisotropy of the ultralow-temperature impact toughness of the high-manganese moderate-thickness plate for the LNG storage tank is improved, and the technology process is greatly shortened.

Description

technical field [0001] The invention belongs to the technical field of iron and steel materials, and in particular relates to a rolling method of a high manganese plate used for an LNG storage tank. Background technique [0002] With the surge of energy consumption in our country, excessive reliance on coal has caused serious air pollution, and large-scale use of clean energy natural gas has become an inevitable development trend. From 2001 to 2015, the annual growth rate of natural gas in my country was 15.9%. By 2020, the apparent consumption will reach 410 billion m3, of which 140 billion m3 will be imported, and seaborne liquefied natural gas (LNG) will account for 50% of the import volume, which will reach 700 million m3. Based on this, my country plans to build more than 200 super-large LNG storage tanks and about 60 marine transport ships. The total investment in LNG storage and transportation facilities is nearly one trillion yuan, and the amount of ultra-low temperat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/02B21J5/00B21B1/46
CPCB21B1/463B21C37/02B21J5/002
Inventor 刘振宇陈俊任家宽陈其源王国栋
Owner NORTHEASTERN UNIV LIAONING
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