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Titanium reinforced high-cobalt martensitic aged anti-corrosion ultrahigh-strength steel and preparation method

An ultra-high-strength steel and martensitic technology, applied in the field of alloy steel, can solve the problems of stress corrosion resistance, strength reduction, and inability to increase strength, and achieve good stress corrosion resistance, high strength, and excellent comprehensive performance.

Active Publication Date: 2014-05-28
CENT IRON & STEEL RES INST
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Problems solved by technology

[0009] In order to obtain higher strength and better stress corrosion resistance, it is not feasible to simply add Cr to the 18Ni (ie C200-C500) series, or add Ti and Co to the 12Cr (ie Custom) series , not only can not improve the strength and achieve the effect of stress corrosion resistance, but will seriously reduce the strength

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  • Titanium reinforced high-cobalt martensitic aged anti-corrosion ultrahigh-strength steel and preparation method
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  • Titanium reinforced high-cobalt martensitic aged anti-corrosion ultrahigh-strength steel and preparation method

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Embodiment Construction

[0052] According to the chemical composition scope of steel of the present invention, adopt 25 kilograms of vacuum induction furnaces to prepare 15 furnaces of 21 kilograms of alloy ingots, its concrete chemical composition is shown in Table 3, and furnace number is 1 # ~15 # .

[0053] After 10 furnaces of steel were smelted and cast into steel ingots, the high-temperature homogenization treatment system was first carried out before forging: after 6 hours of heat preservation at 1200 ° C, the temperature was lowered for forging, and the forging heating temperature was 1150 ° C. The dimensions of forged test rods are: φ15×2000mm, 15×15×2000mm and 25×45×L.

[0054] After forging, the test bar is firstly subjected to solution heat treatment: solution treatment at 1000℃×1h, air cooling, and then sent to the sample section for processing tensile, impact and fracture toughness sample blanks. The final heat treatment is solid solution, deep cooling and aging heat treatment: soluti...

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Abstract

The invention discloses titanium reinforced high-cobalt martensitic aged anti-corrosion ultrahigh-strength steel and a preparation method, belonging to the technical field of alloy steel. The steel comprises the following chemical components in percentage by weight: less than or equal to 0.01% of C, 7.0 to 14.0% of Cr, 3.0 to 11.0% of Ni, 5.0 to 17.0% of Co, 0 to 6.0% of Mo, 0.3 to 2.0% of Ti, less than or equal to 0.3% of Al, and the balance of Fe and inevitable impurity elements. The preparation method preferably adopts smelting processes of vacuum induction, vacuum arc remelting or vacuum induction, electroslag remelting and the like. Compared with the prior art, the steel has the advantages that the comprehensive performance is good under the co-action of high Ti and Co content in the alloy, and the steel has strong toughness matching, higher strength and better stress corrosion resistance at the same time due to the corresponding Cr.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, and in particular provides a titanium-strengthened high-cobalt maraging corrosion-resistant ultra-high-strength steel and a preparation method thereof. The high-cobalt (Co) maraging steel mainly strengthened by titanium (Ti) Corrosion-resistant ultra-high-strength steel. technical background [0002] Prior to this, maraging steel has always been an important branch in the field of ultra-high-strength steel, and its typical representative steel types include 18Ni (ie C200-C500) series and 12Cr (ie Custom) series, of which the traditional 18Ni (ie C200-C500) series strength can reach 3500MPa, and the highest strength applied in actual structural engineering has reached 2500MPa; the traditional 12Cr (ie Custom) series has a maximum strength of more than 1900MPa. But the two still face many problems in use. Although the 18Ni (ie C200-C500) series has high practical application strength, due to t...

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Application Information

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IPC IPC(8): C22C38/52C22C33/04C21D8/00
Inventor 王春旭厉勇吴迪刘振宝梁剑雄刘宪民傅万堂吕知青黄顺喆韩顺田志凌
Owner CENT IRON & STEEL RES INST
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