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Cu-rich nanocluster reinforced ultra-high strength ferrite steel and manufacturing method thereof

A nano-cluster, ultra-high-strength technology, applied in the field of ultra-high-strength ferritic steel strengthened by Cu-rich nano-clusters and its manufacturing, can solve the problem of limited strengthening effect of Cu particles, large spacing between precipitated particles, and uneven particle distribution. problems, to achieve the effects of excellent welding performance and plastic toughness, large production size and uniform distribution

Inactive Publication Date: 2014-09-17
CITY UNIVERSITY OF HONG KONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the size of Cu particles in Cu precipitation-strengthened steel is mostly above 50nm, and the amount of precipitation is small, the distance between precipitated particles is large, and the particle distribution is uneven, so that the strengthening effect of Cu particles is limited, and the strength of the obtained Cu precipitation-strengthened steel is mostly below 1000MPa. , such as the patent CN101328561A discloses a nano-scale Cu precipitation-strengthened chromium-ferritic stainless steel, wherein the Cu precipitation particle size is 50-200nm, and the yield strength of the strengthened ferritic steel obtained by Cu phase precipitation strengthening is not less than 300MPa, tensile strength not less than 450MPa, elongation not less than 25%

Method used

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  • Cu-rich nanocluster reinforced ultra-high strength ferrite steel and manufacturing method thereof
  • Cu-rich nanocluster reinforced ultra-high strength ferrite steel and manufacturing method thereof
  • Cu-rich nanocluster reinforced ultra-high strength ferrite steel and manufacturing method thereof

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Embodiment 1

[0059] According to the composition range of the Cu-rich nano-cluster strengthened ultra-high strength ferritic steel of the present invention, nine kinds of inventive steel NSF101-109 were smelted, and T24 steel used in power stations was smelted at the same time for comparison. According to the alloy composition of NSF101-109 and T24 shown in Table 1, smelting and casting are carried out in an electric arc melting furnace, and the obtained ingot is rolled at a reduction of 5-10% each time to obtain the total deformation The amount is about 70% of the plate. The rolled plate was solution treated at 900°C for 0.5 hours, then cooled to room temperature by argon quenching, then aged at 550°C for 2 hours, and then cooled to room temperature by argon quenching , thus making the invention steel NSF101-109 and the comparison steel T24.

[0060] Table 1. Alloy composition of inventive steel NSF101-109 and comparative steel T24

[0061]

Embodiment 2

[0063] According to the alloy composition of NSF104 in Table 1, it is smelted and cast in an electric arc melting furnace, and the obtained ingot is rolled at a reduction of 5-10% each time, and the total deformation is about 70%. of plates. The rolled plate was subjected to solution treatment at 850° C. for 0.5 hour, then cooled to room temperature by water quenching, then aged at 550° C. for 2 hours, and then cooled to room temperature by air cooling. Invention steel NSF104' was thus produced.

Embodiment 3

[0065] According to the alloy composition of NSF104 in Table 1, it is smelted and cast in an electric arc melting furnace, and the obtained ingot is rolled at a reduction of 5-10% each time, and the total deformation is about 70%. of plates. The rolled plate was subjected to solution treatment at 1200° C. for 0.5 hour, then cooled to room temperature by water quenching, then aged at 550° C. for 2 hours, and then cooled to room temperature by air cooling. Thereby the invention steel NSF104″ was produced.

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Abstract

An ultrahigh strength ferritic steel strengthened by using Cu-rich nanoclusters, and a manufacturing thereof. Components of the steel in weight percentage are as following: C (0 to 0.2%), Cu ( 0.5 to 5%), Ni (0.01 to 4%), Mn (0.01 to 4%), Al (0.001 to 2%), Cr (0 to 12%), Mo (0 to 3%), W (0 to 3%), Mo+W (not lower than 0.05%), V (0 to 0.5%), Ti (0 to 0.5%), Nb (0 to 0.5%), V+Ti+Nb (not lower than 0.01%), Si (0 to 1%), B (0.0005 to 0.05%), P (not higher than 0.04%), S (not higher than 0.04%), N (not higher than 0.04%), O (not higher than 0.05%), and the remaining are Fe and unavoidable impurities. Melting, casting, forging and rolling, and ageing treatment are performed to obtain a ferritic steel which mainly comprises nanoclusters and combined with cryptomere, and receives solid solution and dislocations strengthening treatment, thereby obtaining outstanding toughness, weldability and corrosion resistance.

Description

technical field [0001] The invention relates to an ultra-high-strength ferritic steel and a manufacturing method thereof, in particular to an ultra-high-strength ferritic steel reinforced by Cu-rich nano-clusters and a manufacturing method thereof. Background technique [0002] With the increasing pressure on resources and the environment, environmental protection and energy saving have been paid more and more attention by the iron and steel industry. It is an important way to realize the sustainable development of the iron and steel industry to develop energy-saving, material-saving and high-performance ultra-high-strength steel to meet the structural and functional requirements of various application fields. [0003] Traditional ultra-high-strength steels, such as low-temperature tempered martensitic or lower bainite-strengthened low-alloy steels, high-temperature tempered alloy carbide precipitates, secondary hardened structure-strengthened ultra-high-strength steels, int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C38/16C22C38/58C21D1/00
CPCC22C38/16C21D6/004C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 刘锦川焦增宝
Owner CITY UNIVERSITY OF HONG KONG
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