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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

A method for rolling high manganese medium-thick plates for LNG storage tanks, which belongs to the technical field of steel materials. The steps are: 1) High manganese steel ingots are directly forged and opened into steel billets or the high manganese steel is smelted and poured into thin ingots; 2) The steel billet or thin cast ingot is heated and insulated; 3) The billet or thin cast ingot is rolled into hot-rolled steel using the narrow billet wide spread rolling method or the thin billet direct rolling method; 4) After cooling, the steel billet or thin cast ingot is obtained for LNG storage tanks High manganese medium-thick plates; the present invention can use thinner blanks to produce high-manganese medium-thick plates for LNG storage tanks, which is beneficial to reducing the difficulty of continuous casting production of high-manganese austenitic steel with thermal conductivity; the prepared high-manganese medium-thick plates, The difference in ultra-low temperature impact toughness in the longitudinal and transverse directions is small. It improves the anisotropy of ultra-low temperature impact toughness of high manganese medium-thick plates for LNG storage tanks and greatly shortens the process flow.

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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