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High-strength steel plate with tensile strength of 800 MPa above and manufacturing method thereof

A technology of tensile strength and manufacturing method, applied in the field of high-strength and tough steel plate and its manufacturing, can solve problems such as high difficulty in the production process, and achieve the effects of outstanding substantive features, low cost, and low alloy cost

Inactive Publication Date: 2013-06-05
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the steel plate is rolled, different heat treatment process experiments are required to find the best heat treatment process parameters, so the production process is relatively difficult

Method used

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  • High-strength steel plate with tensile strength of 800 MPa above and manufacturing method thereof
  • High-strength steel plate with tensile strength of 800 MPa above and manufacturing method thereof
  • High-strength steel plate with tensile strength of 800 MPa above and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: the thickness of production steel plate is 32mm.

[0031] Using KR hot metal pretreatment for desulfurization, after treatment, the sulfur content is 0.003%, the temperature of the hot metal is 1270°C, and the arsenic content is 0.003%;

[0032] Converter smelting: the end point carbon content target is 0.08%, P: 0.006%, S: 0.008%. The steel tapping temperature target is 1620°C; the slag stopper and the slag blocking rod are used to tap the steel; ferromolybdenum is added to the converter along with the scrap steel, and ferroalmanganese, lime, and fluorite are added during the tapping process to make top slag; silicon manganese alloy, Alloying ferroalmanganese, ferrochrome, and ferrovanadium, blowing argon for 13 minutes during the tapping process;

[0033]LF refining: arrival temperature 1530°C, exit temperature 1650°C. The heating time is 30min, and the treatment cycle is 58min.

[0034] VD refining: the vacuum time is 15min, and the vacuum degree is ...

Embodiment 2

[0041] Embodiment 2: the thickness of the steel plate involved in this embodiment is 20mm;

[0042] The molten steel smelting and continuous casting slab production process are the same as in Example 1, and the continuous casting slab is reheated: the heating time is 235 minutes, and the furnace temperature is 1160°C. Rolling start temperature: 1064°C. Finishing temperature: 930°C. The quenching temperature of the steel plate is 910°C, the time in the furnace is 40 minutes, and the holding time is 15 minutes, and then water-cooled; the tempering temperature is 650°C, the time in the furnace is 40 minutes, the holding time is 16 minutes, and the steel plate is air-cooled after coming out of the furnace.

[0043] The composition of the steel plate obtained by the above method is the same as in Example 1.

Embodiment 3

[0044] Embodiment 3: the thickness of the steel plate involved in this embodiment is 16mm;

[0045] The molten steel smelting and continuous casting slab production process are the same as in Example 1, and the continuous casting slab is reheated: the heating time is 256 minutes, and the furnace temperature is 1145°C. Rolling start temperature: 1055°C. Final rolling temperature: 925°C. The quenching temperature of the steel plate is 910°C, the time in the furnace is 35 minutes, and the holding time is 15 minutes, and then water-cooled; the tempering temperature is 650°C, the time in the furnace is 35 minutes, the holding time is 15 minutes, and the steel plate is air-cooled after coming out of the furnace.

[0046] The composition of the steel plate obtained by the above method is the same as in Example 1.

[0047] The tensile properties at room temperature are shown in Table 1.

[0048]

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Abstract

The invention provides a high-strength steel plate with tensile strength of 800 MPa above and a manufacturing method thereof. The steel plate produced by the manufacturing method comprises the following components in percentage by weight: 0.08-0.21% of carbon, 0.15-0.45% of silicon, 0.70-1.10% of manganese, at most 0.015% of phosphorus, at most 0.010% of sulfur, 0.40-0.65% of chromium, 0.10-0.25% of molybdenum, 0.030-0.080% of vanadium, 0.010-0.030% of titanium, 0.020-0.050% of aluminum, 0.0005-0.005% of boron, and the balance of iron and inevitable impurities. The tensile strength of the steel plate reaches higher than 800 MPa, the -20 DEG C transverse impact work is not less than 34J, the percentage reduction in area is not less than 45%, and the lateral swelling amount is not less than 0.38 mm; and the invention has the advantages of low cost and favorable welding performance.

Description

technical field [0001] The invention belongs to the field of metal material manufacturing, and specifically relates to a high-strength and tough steel plate with a tensile strength of more than 800 MPa and a manufacturing method thereof. Background technique [0002] Nuclear power is the first choice to fight climate change. Nuclear power basically has no carbon emissions. It is a safe, stable and reliable large power source. It is an irreplaceable strategic choice to achieve sustainable power supply. Accelerating the scale development of nuclear power has become a national policy of our country, and nuclear power construction will become a key national infrastructure construction. an important component of . The country will develop nuclear power safely and efficiently. By 2015, the total installed capacity will exceed 16 million kilowatts; fully participate in the introduction, digestion, absorption, and re-innovation of third-generation nuclear power. [0003] The steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C33/04C21D8/02
Inventor 蒋善玉孙卫华韩启彪王金华孙风晓夏茂森周波
Owner JIGANG GRP
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